Calculation of the rate of administration of dobutamine. Calculation of doses in various dosage forms

B. Calculate the infusion rate using standard IV concentrations (adults).

  1. Action 1. Dose (µg/min): Calculate how much you need to inject the drug in 1 minute. Example: A 70 kg patient is receiving dopamine at a rate of 5 µg/kg/min, so he needs 350 µg/min.
  2. Action 2. Concentration (µg/ml): count how many micrograms of the drug are contained in each ml of solution. Example: 200mg dopamine added to 250ml liquid, hence 200/250mg/ml = 0.8mg/ml = 800mcg/ml.
  3. Action 3. Volumetric infusion rate (ml / min): divide the dose by the concentration (µg/min / µg/ml = ml/min). The infusion pump should be set to the received volumetric rate. Example: 350 µg/min / 800 µg/ml = 0.44 ml/min. Converting ml/min to ml/h is done by simply multiplying by 60, i.e. 0.44*60 = 26 ml/hour. An important rule: the infusomat at a rate of 15 ml/hour pours in one minute the amount of µg of the drug, equal to the amount of mg dissolved in 250 ml of liquid. Example: 200 mg of dopamine dissolved in 250 ml of liquid. Thus, at a rate of 15 ml/hour, 200 micrograms of dopamine are injected in one minute.

C. Preparation of solutions for infusion in children.

  1. Action 1. Round the child's weight to the nearest round number (approximate values ​​are acceptable).
  2. Action 2. Decide on the initial dose of the drug per 1 kg of the child's weight: below are some standard values:

Dopamine

Dobutamine – both at 5 mcg/kg/min

Nitroprusside - 0.5 mcg / kg / min

Adrenalin

Norepinephrine

Isoproterenol - three at 0.05 mcg / kg / min

Action 3. Multiply the starting dose by weight to get the initial infusion rate in mcg/min.

Cardiovascular drugs:

    • Pharmacology of adrenergic receptors
    • Beta blockers

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C (ml / min) \u003d D (mcg / kg / min) x M (kg) / K (mcg / ml)

C - infusion rate in ml/min;

D - given dose of the drug in mcg / kg / min;

M - body weight of the patient in kg;

K is the concentration of the drug in the prepared ("working") solution in mcg/ml.

When using a standard dropper, 1 ml of an aqueous solution contains 20 drops. Therefore, to calculate the infusion rate in drops, you can use the same formula with a correction factor x 20.

C (cap / min) \u003d D (mcg / kg / min) x M (kg) x 20 / K (mcg / ml)

So, if a patient weighing 70 kg, we are going to inject

Dobutrex at a dose 5 mcg/kg/min drip solution 250:250, the rate of administration should be: C (drops / min) = 5 mcg / kg / min x 70 kg x 20/1000 mcg / ml

= 7 drops in 1 minute

For continuous intravenous infusion of Dobutrex solution, it is preferable to use a separate venous access, which facilitates dosing of the drug and reduces the likelihood of bioincompatibility with other substances. Special care and foresight is needed with all kinds of intravenous injections that nurses make through the same catheter through which the Dobutrex solution enters the vein.

These injections may at least two dangerous complications.

One of them is associated with turning off the dropper and stopping the flow of an inotropic agent during the administration of some other drug. This may lead to dangerous decline cardiac output and blood pressure.

Another danger arises from the rapid introduction of a substance from a syringe into the same venous catheter and pushing the dobutrex solution in it into the venous bed. It is easy to imagine that in this case, the dose of dobutamine administered instantly increases sharply, causing tachycardia and often arrhythmia with hemodynamic disturbances. The likelihood of such a complication during manipulations with additional intravenous injection from syringes increases if concentrated solutions of dobutamine (more than 1 mg / ml) are used.

A simple calculation shows how real the danger of such a complication is.

Suppose we have selected a dose of Dobutrex - 5 mcg / kg / min - to support blood circulation in a patient weighing 70 kg and use a solution with a drug concentration of 5 mg / ml (250 mg Dobutrex in 50 ml of 5% glucose). In this case, we inject (5 µg/kg/min x 70 kg) 350 µg of the drug in 1 minute, or about 6 µg in 1 second.

Now imagine that a nurse, having pierced the rubber tube of the dropper two centimeters from the junction of it with the subclavian catheter, injects 5 milliliters of a solution (for example, an antibiotic as prescribed) within 5-6 seconds. What happens to the portion of the Dobutrex solution that the catheter is filled with? Of course, it instantly enters the venous bed. For 1 sec, thus, it will be entered 5 mg Dobutrex, i.e. its dose is almost 1000 (!) times more selected.



When using only one central vein (for example, the internal jugular or subclavian) for the administration of both Dobutrex and all other solutions and medications, the likelihood of complications and problems with maintaining the required rate of infusion of the drug will be less if a two- or three-channel catheter is used. For dobutamine infusion, very careful use of peripheral veins is possible: at the same time, there must be confidence that paravenous administration is excluded, since cases of tissue necrosis have been described when dobutamine and dopamine enter the subcutaneous tissue.

When starting an infusion of inotropic or vasopressor drugs, it is necessary to determine in advance when the infusion will end. In order not to interrupt the started therapy and prevent "failures" of hemodynamics when replacing an empty vial with a freshly prepared one!

With the introduction of Dobutrex at a dose 10 mcg/kg/min patient weighing 70 kg prepared solution ( 250/250 ) will suffice approximately for 6 hours.

[ 250 ml / 0.7 ml/min = 357 minutes ]

dopamine administered intravenously following the same principles as dobutamine. Dopamine doses that vary widely. selected according to clinical effect and depending on the therapeutic goal.

Dosages of Dopamine

"Renal" doses - 1-2.5 mcg / kg / min

Selective stimulation of renal dopamine receptors. Raise glomerular filtration and diuresis.



Small doses - 2-4 mcg / kg / min

Stimulation of b-adrenergic receptors. Increased contractility and increased heart rate. Increased glomerular filtration.

Average doses - 6-8 mcg / kg / min

Stimulation (a and b-adrenergic receptors. Increased CO. Increased heart rate. Vasoconstriction, increased OPS.

High doses - > 10 mcg/kg/min

Predominantly stimulation a-adrenergic receptors. Vasoconstriction, a significant increase in OPS. It is possible to decrease the SW.

Dopamine is available in ampoules with a solution of various concentrations. For example, 1 ampoule of Dopmin contains 200 mg active substance in 5 ml of solution (40 mg/ml). In 1 ampoule domestic drug"Dopamine" -25 mg in 5 ml of solution (5 mg / ml). Dopamine can be used for intravenous infusion using an automatic dosing syringe without dilution. The infusion rate, depending on the prescribed dose and the patient's body weight, can be calculated using the above formula or determined from a table or nomogram.

Adrenalin. The ampoule contains 1 ml of a 0.1% solution of adrenaline hydrochloride, i.e. 1 mg of active substance. The dose of epinephrine in the treatment of critically ill patients is extremely variable, it must be titrated according to the hemodynamic effect, which requires careful monitoring and administration using an infusion pump or dropper with an accurate dispenser. At low doses (0.04-0.1 μg / kg / min), the b-adrenomimetic effect prevails, and at higher doses (up to 1.5 μg / kg / min), the a-mimetic effect comes to the fore.

A solution of adrenaline for intravenous continuous infusion is prepared depending on the dose administered. If necessary, administer 0.1-1.5 μg / kg / min, dilute 10 mg of the drug (10 ampoules) in 250 ml of a 5% glucose solution or in any other standard crystalloid solution for intravenous administration (physiological saline, Ringer- lactate, 10% glucose, etc.). Working concentration in such a solution -40 mcg/ml.

For the administration of adrenaline at a dose 0.5 µg/kg/min to a patient with a body weight of 70 kg, the rate of administration of the solution prepared in this way will be 0.875 ml/min.

If it is supposed to support blood circulation using a small dose of adrenaline - 0.05-0.1 mcg / kg / min - it is advisable to prepare a less concentrated solution: 20 mcg / ml. To do this, 5 ampoules (5 mg) of adrenaline are added to 250 ml of a 5% glucose solution. For the introduction of adrenaline at a dose of 0.05 mcg / kg / min to a patient weighing 70 kg, the infusion rate of the solution will be 0.175 ml / min.

A vial containing 250 ml of a solution of adrenaline at a dilution of 20 μg / ml is enough for a day at this rate of infusion. It is not necessary to prepare a solution of preparations for more than 24 hours. If after 24 hours an unused solution of the drug remains in the vial, it must be replaced with a freshly prepared one.

Norepinephrine is produced in the form of a 0.2% solution in ampoules of 1 ml; 1 ampoule contains 2 mg of the drug. Doses of norepinephrine, as well as adrenaline, are extremely variable - from 0.03 to 2.5 mcg / kg / min. The clinical value of this powerful vasoconstrictor has been mixed in the literature. Many clinicians have recently considered it unacceptable to use similar drugs in the treatment of critical circulatory disorders due to increased tissue perfusion disorders during their intravenous administration. However, recent studies have shown the benefits of stronger than dopamine, vasopressor amines in therapy, in particular, septic shock. Norepinephrine more effectively restores vascular tone, causing less tachycardia than dopamine.

The preparation of "working" solutions, methods of administration and dosing of norepinephrine are based on the same rules that apply in therapy with other catecholamines.

Mezaton. Gutron.

These drugs with an isolated (a-mimetic property) have a direct vasoconstrictor effect and increase arterial pressure without directly affecting the heart. Their use is limited to specific clinical conditions, which are based on a decrease in vascular tone and vasodilation, accompanied by a drop in blood pressure (neurogenic collapse, spinal injury with impaired sympathetic regulation, specific poisoning, etc.). Mezaton is usually first administered intravenously in small amounts from 1 to 10 mg as a solution prepared in a syringe, into which 1 ml of a 1% solution of the drug is taken and 10 ml of glucose solution or saline are added. After evaluating the hemodynamic response to this introduction, if necessary, they switch to a drip infusion of a mezaton solution with a concentration of 10 mg per 100 ml, titrating the rate of administration according to changes in blood pressure.

Do not use drugs of this group with ongoing bleeding and severe hypovolemia!

*************************

As we have already noted, all catecholamines used in clinical practice, have their own characteristics in their effect on adrenergic receptors and. respectively, on hemodynamics. The use of these features allows the doctor to find the most beneficial drug combinations in various clinical situations, based on hemodynamic and metabolic monitoring data, and based on the therapeutic strategy.

Dobutamine can greatly help in solving the therapeutic problems that confront the clinician in the intensive care unit and intensive care in the treatment of critically ill patients. In a generalized form, the principal algorithm for the use of dobutamine in critically ill patients is shown in Figure 5.

Rice. 5. Principal algorithm for the use of dobutamine in the treatment of critically ill patients

It is quite obvious that all the efforts of the doctor are aimed at saving the life of the patient and restoring his health. Nevertheless, this main goal can only be achieved through a systematic solution of precisely and timely formulated milestone, intermediate diagnostic and therapeutic tasks. One of critical components Complex intensive care of critical conditions is, as we have already noted, ensuring adequate oxygen delivery to tissues. In the algorithm proposed for this, the doctor sets himself the goal of increasing the TO 2 of the patient to a level that provides the maximum and sufficient for these specific conditions (fever, hypermetabolism, sepsis, etc.) consumption of O 2 . (Of course, this approach should not be considered as an alternative to the prudent use of means to reduce the increased oxygen demand in the body).

To evaluate the effectiveness of therapy aimed at achieving this goal, continuous and reliable monitoring of the hemodynamic and metabolic parameters presented in the diagram is necessary. The Swan-Ganz catheter significantly expands our capabilities in assessing the hemodynamic status, allowing us to accurately and with the necessary discreteness determine the main determinants of the performance of both the right and left parts of the heart, the amount of transport and consumption of O 2 . Without a catheter in the pulmonary artery, the precision of this assessment in patients with multiorgan pathology, with severe trauma, with sepsis, with RDS, etc. very often it turns out to be insufficient, which does not allow to fully and without complications implement therapeutic plans.

To achieve this goal, first of all, it is necessary to optimize the venous return of blood to the heart - preload. The Frank-Starling mechanism in increasing the productivity of the heart and, accordingly, TO 2 should be used in full, before the means of influencing other mechanisms of increasing the productivity of the heart are connected. In the process of volumetric loading, constantly monitor CVP (RV preload) and pulmonary artery occlusive pressure (LV preload), asking yourself the question - CVP> or< 10, оДЛА >or< 18? При повышении этих давлений более 10 и 18мм рт.ст., соответственно, начинают введение добутамина, контролируя ТО 2 и VO 2 . В соответствии с клиническими требованиями и состоянием газообмена подбирают необходимую респираторную поддержку и прочие компоненты интенсивной терапии. При низком АД (вопрос: ср. АД < 70 ? ответ: Yes) and OPS additionally prescribe vasopressors, and with arterial and persistent venous hypertension - venodilators.


LITERATURE:

1. Vasilenko N., Edeleva N.V., Dovzhenko Yu M. Zhurba N.M. Features of the functioning of the oxygen supply system on the 1st day in patients with different course post-traumatic period. Anest. i reanimat., 1989; 2:47.

2. Lebedeva R.N. . Rusina O. V. Catheochlamins and adrenergic receptors. Anest. i reanimat., 1990; 3:73-76.

3 .Lebedeva R.N., Tugarinov S.A., Chaus N.I., Rusina O.V., Mustafip A. Clinical experience with the use of dobutamine in patients in the early postoperative period. Anest. i reanimat., 1993; 3(?):48-50.

4. Nikolaepko E.M Combined use of dobutamine and phosphocreatine in the treatment of critical circulatory disorders. In book. "Actual problems and prospects for the development of modern resuscitation". Moscow, 1994:155.

5. Nikolaepko E.M The effect of dobutamine on transport (T02) and oxygen consumption (V02) at cardiogenic shock In the book: "Actual issues of anesthesiology and resuscitation" Donetsk, 1993:110.

6 Nikolayiko E. M. The critical level of O2 transport in the early period after heart valve replacement. Anest. i reanimatol., 1986; 1:26.

7. Nikolaenko E.M., Seregin G.I., Arykov I.M. and others. Inhalation administration of NO: new approach for the treatment of acute respiratory failure and pulmonary hypertension. 10 All-Russian. Plenum of the Board General. and the Anest Federation. and resuscitator. N-Novgorod, 1995:71-72.

8. Ryabov GA Syndromes of critical states. Moscow, 1988.

9. American Heart Association. Guide lines for cardiopulmonary resuscitation and emergency cardiac care. JAMA, 1992; 268:2220.

10. Bishop M N . Shoemaker W.C. Appell P L, et al. Relationship between supranormal values, time delais, and outcome in severly traumatized patients. Cr Care Med. 1993; 21:56-63

11. Brislow M.R. , Ginsburg R., Umans V., et al. bl and b2-adrenergic receptor subpopulations in nonfailing and failing human ventricular myocardium: Coupling of both receptor subtypes to miscle contraction and selective b2-receptordown-regulation in heart failure. Cirk Res., 1986; 59:297-307.

12. Bristow M R , Ginshurg R , Gilbert E M , et al. Heterogenous regulatory changes in cell surface membrane receptors coupled to a positive inotropic response in the failing human heart. Basic Res. Cardiol., 1987; 82(Suppl): 369-376.

13. Desjars P , Pinaud M., Potel G., et al. A reappraisal ofnorepinephnne in human septic shock. Crit. Care Med., 1987; 15:134-137.

14. Edwards J.D. Oxigen transport in cardiogenic and septic shock. Crit. Care Med., 1991; 19:658-663.

15. Cryer H.M., Richardson J.D., Longmier-Cook S. Oxygen delivery in patients with adult respiratory distress syndrome who undergo surgery. Arch Surg., 1989; 124:1878-1885.

16. Feldman M.D., Copelas L, Gwathmey J.K., et al. Deficient production of cyclic AMP: Pharmacologic evidence of an important cause of contractile dysfunction in patients with end-stage heart failure. Circulation, 1987; 75:331-339.

17. Gilbert J., Erian R, Solomon D Use of survives cardiorespiratory values ​​as therapeutic goals in septic shock. Crit. Care Med., 1990; 18:1304-1305.

18. Hankeln K. V, Gronemeyer R., Held A . and al. Use of continuous noninvasive measurement of oxygen consumption in patients with ARDS following shock of various etiologies. Crit. Care Med., 1991; 19:642-649.

19. Hayes M.A., Timmins A.C., Yau EHS at al. Elevation of systemic oxygen delivery in the treatment of critically ill patients. N.Eng. J. Med., 1994; 330:1717-1722.

20. Hayes M.A., Yau EHS, Timmins A.C., at al. Response of critically ill patients to treatment aimed at achieving supranormal oxygen delivery and consumption in relation to outcome. Chest., 1993; 103:886-895.

21. Hesselvik J.F., Brodin V Low dose of norpinephrine in patients with septic shock and oliguria: effects on afterload, urine flow, and oxygen transport. Crit. Care Med., 1989; 17:179-180.

22. MacCanel K.L, Glraud G D. Hamilton P.L., et al. Haemodynamic response to dopamine and dobutamine infusion sas a function of duration of infusion. Pharmacology, 1983; 26:29.

23. Martin FROM, Eon B., Saux. et al. Renal effects of norpinephrine used to treat septic shock patients. Crit. Care Med., 1990; 18:282-285.

24. Meyer S L, Curry G C, Donsky M S., et al. Influence of dobutamine on hemodynamics and coronaryblood flow in patients with and without coronary arthery disease. Am. J. Cardiol., 1976; 38:103-108.

25. Mikulis E. Cohn J.N , Franciosa J.A. Comparative hemodynamic effects of inotropic and vasodilator drugs in sever heart failure. Circulation, 1977; 56(4):528.

26. Mohsamjar Z., Goldbach P., Tashkin D.P., et al. Relationship between oxygen delivery and oxygen consumption in the adult respiratory distress syndrome. Chest., 1983; 84:267.

27. Moore F.A., Haemel J.B., Moore E.E., atall. Icommensurate oxygen consumption in response to maximal oxygen availability predicts postinjury organ failure. J. Trauma. 1992; 33:58-67.

28. Nicolayenco E.M. The oxygen budget in septic patients with preexisting heart failure. Intensive Care Med., 1994: 20: (suppi. 2):20.

29. Parrillo J.E. Septic shock: Clinical manifestations, pathogenesis, hemodynamics, and management in a critical care unit. In: Parillo JE and Ayres SM (eds): Major Issues in Critical Care Medicine. Baltimore, Williams & Wilkins, 1984; 122.

30. Rashkin M.S., Bosken C., Buaghman R.P. Oxygen delivery in critically ill patients relationship to blood lactate and survival. Chest., 1985:87:580.

31. Schneider A.J., Groenveld ABJ, Teule G.J., et al. Volume expansion, dobutamine and noradrenaline for treatment of right ventricular dysfunction in porcine septic shock: a combined invasive and radionucleid study. Circ Shock, 1987; 23:93-106. (Increased DBP is necessary to improve RV myocardial perfusion.)

32. Shoemaker W.C., Apell P.L.. Kram H.B., et al. Haemodynamic and oxygen transport responses in survivors and nonsurvivors of high-risk surgery. Crit. Care Med., 1993; 21:977-990.

33. Tuchschmidt J., Oblitos D., Fried J. C. Oxygen consumption in sepsis and septic shock. Crit. Care Med., 1991, 19:664-671.

34. Unverferth D V., Blanford M., Kates R.E., et al. Tolerance to dobutamine after 72-hour conti infusion. Am. J. Med., 1980, 6-9:262.

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Dosage form:  concentrate for solution for infusion Compound: For 1 ml:

5 mg/ml

10 mg/ml

20 mg/ml

40 mg/ml

Active substance :

dopamine hydrochloride

Auxiliarysubstances :

Sodium disulfite

0.1 M hydrochloric acid solution

Water for injections

before 1,0 ml

Description: Clear, colorless or slightly yellowish solution. Pharmacotherapeutic group:Non-glycoside structure cardiotonic agent ATX:  

C.01.C.A.04 Dopamine

Pharmacodynamics:

Excites dopamine, beta-adrenergic receptors (in low and medium doses) and alpha-adrenergic receptors (in high doses). Improvement in systemic hemodynamics leads to a diuretic effect. Has a specific stimulating effect on postsynaptic dopamine receptors in smooth muscle vessels and kidneys.

At low doses (0.5-3 mcg/kg/min) acts predominantly on dopamine receptors, causing an expansion of the renal, mesenteric, coronary and cerebral vessels. It has a positive inotropic effect. Expansion of the vessels of the kidneys leads to an increase in renal blood flow, an increase in the glomerular filtration rate, an increase in diuresis and sodium excretion; there is also an expansion of the mesenteric vessels (this action of dopamine on the renal and mesenteric vessels differs from the action of other catecholamines).

In medium doses (2-10 mcg / kg / min) dopamine stimulates postsynaptic beta 1-adrenergic receptors, has a positive inotropic effect (due to increased contractile function of the myocardium) and increases cardiac output. Systolic blood pressure and pulse pressure may increase; while diastolic blood pressure does not change or slightly increases. Coronary blood flow and myocardial oxygen consumption tend to increase. Stimulation of beta 2 -adrenergic receptors is negligible or absent, so the total peripheral vascular resistance (TPVR) usually does not change. Peripheral blood flow may slightly decrease, mesenteric blood flow increases.

At high doses (10 mcg/kg/min or more) predominantly stimulates alpha 1-adrenergic receptors, causes an increase in peripheral vascular resistance, an increase in heart rate and narrowing of the renal vessels (the latter may reduce previously increased renal blood flow and diuresis). Due to the increase in minute volume of blood and peripheral vascular resistance, both systolic and diastolic blood pressure increase.

Start therapeutic effect- within 5 minutes against the background of intravenous administration. After cessation of administration, the effect persists for 10 minutes. Newborns and children younger age more sensitive to the vasoconstrictor action of dopamine than adults.

Pharmacokinetics:

Dopamine is administered only intravenously. About 25% of the administered dose is captured by neurosecretory vesicles, where hydroxylation occurs and is formed. It is widely distributed in the body (volume of distribution in adults 0.89 l / kg), partially passes through the blood-brain barrier. Communication with blood plasma proteins - 50%.

Dopamine is rapidly metabolized in the liver, kidneys and blood plasma by monoamine oxidase and catechol-O-methyltransferase to inactive metabolites of homovanillic acid (HVA) and 3,4-dihydroxyphenylacetate.

The half-life of the drug (T 1/2) - adults: from blood plasma - 2 minutes; from the body - 9 min; the total clearance of dopamine is 4.4 l / kg / hour. Excreted with urine; 80% of the dose of dopamine is excreted within 24 hours in the form of metabolites, in small quantities - unchanged. In children under 2 years of age, dopamine clearance is doubled compared to adults. In newborns, there is a significant variability in dopamine clearance (5-11 minutes, on average 6.9 minutes). The apparent volume of distribution in neonates is 1.8 L/kg.

Indications:

Shock of various origins: cardiogenic, postoperative, infectious toxic, anaphylactic, hypovolemic (after restoration of circulating blood volume);

Acute cardiovascular failure;

Syndrome of "low minute volume of blood circulation" in cardiac surgery patients;

Severe arterial hypotension.

Contraindications:

Hypersensitivity to the components of the drug (including other sympathomimetics);

thyrotoxicosis;

Pheochromocytoma;

In combination with monoamine oxidase inhibitors, with cyclopropane and halogen-containing agents for general anesthesia;

With uncorrected supraventricular and ventricular tachyarrhythmias (including with tachysystolic atrial fibrillation) and with ventricular fibrillation;

Angle-closure glaucoma;

Age up to 18 years (efficacy and safety not established).

Carefully:

hypovolemia;

Pathological conditions leading to obstruction of the outflow tract of the left ventricle (hypertrophic obstructive cardiomyopathy, severe aortic stenosis);

Metabolic acidosis, hypercapnia, hypoxia, hypokalemia;

Peripheral arterial disease (including atherosclerosis, arterial thromboembolism, thromboangiitis obliterans, obliterating endarteritis, diabetic angiopathy, Raynaud's disease), frostbite of the extremities;

Acute myocardial infarction;

Heart rhythm disturbances;

Arterial hypotension in the pulmonary circulation;

Diabetes;

Bronchial asthma;

Pregnancy.

Pregnancy and lactation:

Preclinical studies have shown that when administered intravenously at doses up to 6 mg / kg / day, it did not have a teratogenic and fetotoxic effect in rats and rabbits, but increased the mortality of pregnant female rats. Available clinical data are insufficient to assess the fetotoxic and teratogenic effects of dopamine when used during pregnancy.

In pregnant women, the drug should be used only if the expected benefit to the mother exceeds potential risk for the fetus and/or child.

Data on the penetration of dopamine through the placenta and on the excretion of the drug in breast milk missing. When using the drug Dopamine, breastfeeding should be discontinued.

Dosage and administration:

Dopamine is administered intravenously as a continuous infusion using appropriate equipment (infusion pumps).

The dose of the drug and the rate of administration should be selected individually, depending on the severity of shock, the magnitude of blood pressure and the patient's response to treatment.

To increase diuresis and achieve a positive inotropic effect (increase contractile activity myocardial) Dopamine is administered at a rate of 100-250 mcg / min (1.5-3.5 mcg / kg / min - the area of ​​\u200b\u200blow doses).

In intensive surgical therapy Dopamine is administered at a rate of 300-700 µg/min (4-10 µg/kg/min is the medium dose range).

For septic shock Dopamine is administered at a rate of 750-1500 mcg / min (10.5-20 mcg / kg / min - area maximum doses).

Most patients will be able to maintain a satisfactory condition with doses of Dopamine less than 20 mcg/kg/min. In some cases, the dose in order to influence the blood pressure of Dopamine can be increased to 40-50 mcg / kg / min or more. If the effect of continuous infusion of Dopamine is insufficient, norepinephrine () may be additionally prescribed at a dose of 5 μg / min (with a patient's body weight of about 70 kg).

When violations occur or increase heart rate further increase in the dose of Dopamine is contraindicated.

The duration of dopamine administration depends on individual characteristics patient. Available positive experience Dopamine infusions for up to 28 days. After stabilization of the patient's condition, the drug is discontinued gradually.

Solution preparation rule: 0.9% sodium chloride solution, 5% dextrose (glucose) solution (including mixtures thereof), 5% dextrose (glucose) solution in Ringer's lactate solution, sodium lactate solution and Ringer's lactate are used for dilution.

In order to prepare a solution for intravenous infusion, 400 or 800 mg of dopamine must be added, respectively, to 250 ml or 500 ml of the above solvents. The resulting solution contains 1600 micrograms of dopamine per ml.

The preparation of the infusion solution should be made immediately before use (the stability of the solution is maintained for 24 hours, with the exception of a mixture with Ringer's lactate solution - a maximum of 6 hours). The dopamine solution should be clear and colorless.

Side effects:

Classification of the World Health Organization (WHO) of adverse drug reactions according to the frequency of development: very often (> 1/10 appointments); often (>1/100 and<1/10 назначений); нечасто (>1/1000 and<1/100 назначений); редко (>1/10000 and<1/1000 назначений); очень редко (<1 /10000), включая отдельные сообщения.

From the side of the cardiovascular system: often - extrasystole, tachycardia, anginal pain, lowering blood pressure, symptoms of vasoconstriction. Rarely - bradycardia, conduction disturbances, increased blood pressure, expansion of the QRS complex on the ECG; life-threatening ventricular arrhythmias.

From the side of the central nervous system: often - headache; rarely - anxiety, restlessness.

From the respiratory system: rarely - shortness of breath.

From the digestive system: often - nausea, vomiting.

From the urinary system: rarely - polyuria (when administered in low doses).

From the side of the organ of vision: rarely - mydriasis.

Reactions at the injection site: rarely - phlebitis, soreness at the injection site. If the drug gets under the skin - necrosis of the skin and subcutaneous tissue.

Laboratory indicators:rarely - azotemia.

Others : rarely - piloerection.

Allergic reactions: the drug contains sodium disulfite, the use of which may in rare cases cause or exacerbate hypersensitivity reactions and bronchospasm (especially in patients with bronchial asthma).

Overdose:

Symptoms: excessive increase in blood pressure, spasm of peripheral arteries, tachycardia, ventricular extrasystole, angina pectoris, shortness of breath, headache, psychomotor agitation.

Treatment: due to the rapid elimination of dopamine from the body, these phenomena stop when the dose is reduced or the administration is stopped. If overdose symptoms persist, short-acting alpha-blockers (with excessive increase in blood pressure) and beta-blockers (with heart rhythm disturbances).

Interaction:

Pharmaceutical drug interactions

Dopamine is pharmaceutically incompatible with alkaline solutions (inactivate), acyclovir, alteplase, amikacin, amphotericin B, ampicillin, cephalothin, dacarbazine citrate, aminophylline (eufillin), calcium theophylline solution, furosemide, gentamicin, heparin, sodium nitroprusside, benzipenicillin, tobramycin, oxidizing agents, iron salts, thiamine (dopamine contributes to the destruction of vitamin B 1).

Pharmacodynamic drug interactions

With simultaneous use with adrenomimetics, monoamine oxidase inhibitors (including moclobemide, selegiline, furazolidone, procarbazine) and guanethidine, the sympathomimetic effect of dopamine is enhanced (an increase in the duration and an increase in cardiostimulatory and pressor effects).

With the simultaneous use of dopamine with diuretics, the diuretic effect of the latter is enhanced.

Inhalation drugs for general anesthesia - derivatives of hydrocarbons (cyclopropane, enflurane, methoxyflurane, chloroform) - increase the cardiotoxic effect of dopamine (increased risk of severe supraventricular or ventricular tachyarrhythmias).

With the simultaneous use of dopamine with tricyclic antidepressants (including), selective serotonin and epinephrine (adrenaline) reuptake inhibitors (, ) and cocaine, the pressor effect of dopamine increases, the risk of developing heart rhythm disturbances, severe arterial hypertension or hyperpyrexia increases.

With simultaneous use with beta-blockers (,), the pharmacological effects of dopamine are reduced.

Derivatives of butyrophenone () and phenothiazine reduce dilatation of the mesenteric and renal arteries caused by low doses of dopamine.

With the simultaneous use of dopamine with guanethidine and preparations containing rauwolfia alkaloids (, raunatin), severe arterial hypertension may develop. If combined use of these drugs is necessary, the lowest possible dose of dopamine should be used.

With the simultaneous use of dopamine with levodopa, the risk of developing cardiac arrhythmias increases.

With the simultaneous use of dopamine with thyroid hormones, it is possible to increase the pharmacological action of both dopamine and thyroid hormones.

Ergot alkaloid derivatives (, ergotamine, etc.) and enhance the vasoconstrictor effect of dopamine and increase the risk of ischemia and gangrene, as well as severe arterial hypertension.

Phenytoin, when used simultaneously with dopamine, can contribute to the development of arterial hypotension and bradycardia (the effect depends on the dose of drugs and the rate of administration).

With the simultaneous use of dopamine with cardiac glycosides, the inotropic effect increases and the risk of developing cardiac arrhythmias increases (continuous ECG monitoring is required).

Dopamine reduces the antianginal effect of nitrates, which, in turn, can reduce the pressor effect of dopamine and increase the risk of arterial hypotension.

Special instructions:

The drug Dopamine is intended only for intravenous infusions and can only be used in a diluted form!

Hypovolemia (through the administration of blood plasma and other blood-substituting fluids), acidosis, hypoxia, and hypokalemia should be corrected in patients in shock before Dopamine is administered.

Dopamine infusion should be carried out under the control of diuresis, heart rate, minute volume of blood, blood pressure and ECG. An increase in blood pressure indicates the need to reduce the dose of Dopamine.

Dopamine improves atrioventricular conduction and may increase ventricular rate in patients with atrial fibrillation and flutter. Dopamine increases myocardial excitability and can lead to the appearance or increase in ventricular extrasystoles; the occurrence of ventricular tachycardia and ventricular fibrillation is rare. In patients with a history of such arrhythmias, continuous ECG monitoring should be performed.

Monoamine oxidase inhibitors increase the pressor effect of sympathomimetics and may contribute to the development of a hypertensive crisis and / or cardiac arrhythmias.

Do not use the drug in critically ill patients in order to correct or prevent acute renal failure.

Strictly controlled studies of the use of the drug in patients under the age of 18 years have not been conducted. There are separate reports of the occurrence in this group of patients of arrhythmias and gangrene associated with extravasation of the drug when administered intravenously.

To reduce the risk of extravasation in patients of any age, dopamine should be administered into large veins whenever possible. To prevent tissue necrosis in case of extravasal ingestion of the drug, an abundant infiltration of the affected area with 10-15 ml of 0.9% sodium chloride solution containing 5-10 mg of phentolamine should be immediately carried out. The solution is injected with a syringe through a thin hypodermic needle. Sympathetic blockade with phentolamine leads to immediate development of local hyperemia within the first 12 hours after exposure to Dopamine, so infiltration should be performed as soon as possible after detection of Dopamine extravasation.

When prescribing Dopamine to patients with peripheral vascular disease and / or disseminated intravascular coagulation syndrome (DIC), a history of abrupt and pronounced vasoconstriction may occur, leading to skin necrosis and gangrene of the limb. Careful monitoring of the patient's condition and blood circulation in the limbs should be carried out. If signs of peripheral ischemia are detected, the administration of the drug should be stopped immediately.

Influence on the ability to drive transport. cf. and fur.:

The effect on the ability to drive vehicles or other mechanisms has not been studied.

Release form / dosage:Concentrate for solution for infusion, 5 mg/ml, 10 mg/ml, 20 mg/ml and 40 mg/ml. Package:

5 ml in neutral glass ampoules.

5 ampoules in a blister pack made of PVC film.

1 or 2 blister packs together with instructions for use and an ampoule knife or an ampoule scarifier in a cardboard box.

5 or 10 ampoules, together with instructions for use and an ampoule knife or an ampoule scarifier, in a cardboard box for consumer packaging with a corrugated liner.

When using ampoules with a break point or ring, an ampoule knife or an ampoule scarifier is not inserted.

Packaging for hospitals

50, 100 blister packs with ampoules, together with an equal number of instructions for use, are placed in a corrugated cardboard box.

Storage conditions:

In a place protected from light, at a temperature of 15 to 25 ° C.

Keep out of the reach of children.

Best before date:

Do not use after the expiry date stated on the packaging.

Conditions for dispensing from pharmacies: On prescription Registration number: LP-003000 Date of registration: 21.05.2015 Expiration date: 21.05.2020 Registration certificate holder: ELLARA, OOO Russia Manufacturer:   Information update date:   19.01.2016 Illustrated Instructions Dosage form:  To concentrate for the preparation of a solution for intravenous administration. Compound:

1 ml of concentrate contains:

Active substance :

norepinephrine hydrotartrate monohydrate

(equivalent to norepinephrine

Excipients :

Sodium chloride

Sodium disulfite

Water for injections

q.s. up to 1 ml

Description:

Clear, colorless solution.

Pharmacotherapeutic group:alpha-agonist ATX:  

C.01.C.A.03 Norepinephrine

Pharmacodynamics:

Norepinephrine is a biogenic amine, a neurotransmitter.

It has a powerful stimulating effect on α-adrenergic receptors and a moderately stimulating effect on β 1 -adrenergic receptors.

Getting into the blood even at low concentrations, it causes generalized vasoconstriction, with the exception of the coronary vessels, which expand due to indirect action (due to an increase in oxygen consumption), which leads to an increase in the strength and (in the absence of vagotonia) the frequency of myocardial contraction, increasing the stroke and minute volume hearts.

It causes an increase in blood pressure (BP), both systolic and diastolic, increases total peripheral vascular resistance (OPSS) and central venous pressure. The cardiotropic effect of norepinephrine is associated with its stimulating effect on the β 1 -adrenergic receptors of the heart.

Pharmacokinetics:

Suction

After intravenous administration, the effects of norepinephrine develop rapidly. has a short duration of action. The half-life is approximately 1-2 minutes.

Distribution

Norepinephrine is rapidly cleared from plasma by reuptake and metabolism.

Poorly penetrates the blood-brain barrier.

Metabolism

Metabolized in the liver and other tissues by methylation with catechol-o-methyltransferase and deamination with monoamine oxidase. The final metabolite is 4-hydroxy-3-methoxymandelic acid. Intermediate metabolites: normetanephrine and 3,4-dihydroxymandelic acid.

breeding

Norepinephrine metabolites are predominantly excreted in the urine as sulfate conjugates and to a lesser extent as glucuronides.

Indications:

The drug Norepinephrine Kabi is indicated as an emergency remedy for restoring blood pressure in case of its acute decrease.

Contraindications:

Norepinephrine Kabi is contraindicated:

Patients with arterial hypotension caused by hypovolemia (except when used to maintain cerebral and coronary blood flow until the end of therapy aimed at replenishing the volume of circulating blood);

In case of hypersensitivity to the drug or to any of the excipients;

With thrombosis of mesenteric (mesenteric) and peripheral vessels due to the risk of ischemic events and an increase in the infarct zone;

When conducting anesthesia with cyclopropane or halothane due to the risk of developing cardiac arrhythmias;

With severe hypoxia and hypercapnia.

Carefully:

Severe left ventricular failure;

Acute heart failure;

Recent myocardial infarction;

Prinzmetal's angina;

Thrombosis of the coronary, mesenteric or peripheral vessels (risk of aggravation of ischemia and an increase in the infarct zone), insufficient blood circulation;

Violation of the heart rhythm during the infusion of the drug (correction measures are described in the "Special Instructions" section);

Hyperthyroidism or diabetes mellitus;

Elderly patients.

Pregnancy and lactation:

Norepinephrine can interfere with placental circulation and cause fetal bradycardia. Also, the drug can cause uterine contractions, which can lead to fetal asphyxia in the later months of pregnancy.

The drug norepinephrine during breastfeeding should be used with caution, as there is no data on its ability to penetrate into breast milk.

Therefore, before deciding to start norepinephrine infusion, it should be determined whether the expected benefit to the mother outweighs the potential risk to the fetus.

Dosage and administration:

Enter only intravenously.

The individual dose of norepinephrine is determined by the physician depending on the clinical condition of the patient.

Norepinephrine must be administered through central venous access devices in order to reduce the risk of extravasation and subsequent tissue necrosis (see section "Special Instructions").

The introduction of the drug

Recommended initial dose and rate of administration of the drug- from 0.1 to 0.3 mcg / kg / min norepinephrine hydrotartrate. The rate of infusion is progressively increased by titration in steps of 0.05-0.1 µg/kg/min, according to the observed pressor effect, until the desired normotension is achieved.

There are individual differences in the dose required to achieve and maintain normotension. The goal is to achieve the lower limit of normal systolic pressure (100-120 mmHg) or achieve a sufficient level of the average value (above 65-80 mmHg, depending on the patient's condition). The individual dose, due to the high variability of the clinical response with the introduction of the drug, is set depending on the patient's condition.

Before or during therapy, correction of hypovolemia, hypoxia, acidosis, hypercapnia is necessary.

Norepinephrine should be used concomitantly with adequate volume replacement.

It is necessary to beware of the introduction of a solution of norepinephrine under the skin and into the muscles because of the risk of developing necrosis.

Concentrate dilution

The concentrate should be diluted in 5% dextrose solution. Do not mix with other drugs.

For administration using a syringe infusion pump, 23 ml of a 5% dextrose solution is added to 2 ml of a concentrate for preparing a solution for intravenous administration of the drug Norepinephrine Kabi, 1 mg / ml.

For administration using a dropper, 230 ml of a dextrose solution are added to 20 ml of a concentrate for preparing a solution for intravenous administration of the drug Noradrenaline Kabi, 1 mg / ml.

With both dilution options, the final concentration of the resulting solution for intravenous administration is 0.08 mg/ml norepinephrine hydrogen tartrate, which corresponds to 0.04 mg/ml norepinephrine base. After diluting the concentrate, the solution must be used within 12 hours.

Volume of injected liquid: the level of dilution depends on the condition of the patient. If a large volume of liquid is required, the drug should be diluted with a large amount of dextrose and, therefore, a drug with a lower concentration should be used for administration. If it is undesirable to introduce a large volume of liquid, the concentrate is diluted with a smaller volume of dextrose, obtaining a more concentrated solution.

To determine the infusion rate of a solution of the drug Noradrenaline Kabi with a concentration of 0.08 mg / ml and the corresponding amount of norepinephrine hydrotartrate, you can use the data from the table:

Table. Calculation of the infusion rate (ml / h) of a solution of the drug Noradrenaline Kabi with a concentration of 0.08 mg / ml *

Patient's body weight

Dose of norepinephrine hydrotartrate (µg/kg/min)

Amount of norepinephrine hydrotartrate (mg/h)

Infusion rate (ml/ h)

*When using a different dilution of the concentrate, you should replace the value of the concentration of the solution in the formula used:

Infusion rate (ml/h) = dosage (mcg/kg/min) x patient weight (kg) x 60 (min) x 0.001 / 0.08 mg/ml

Arterial pressure:

The duration, rate of administration and dosing of the norepinephrine solution are determined by the data of cardiac activity monitoring with mandatory medical monitoring of blood pressure (every 2 minutes until normotonia is reached, after every 5 minutes during the entire infusion) in order to avoid the occurrence of arterial hypertension.

P termination of therapy:

Norepinephrine therapy should be reduced in stages, as abrupt withdrawal may lead to acute hypotension.

The course of treatment can last from several hours to 6 days.

Side effects:

With the introduction of norepinephrine, the following side effects may occur:

From the side of the cardiovascular system : arterial hypertension and tissue hypoxia; ischemic disorders (caused by severe vasoconstriction, which can lead to pallor and coldness of the extremities and face); tachycardia, bradycardia (probably reflex as a result of increased blood pressure), arrhythmias, palpitations, increased contractility of the heart muscle as a result of a β-adrenergic effect on the heart (inotropic and chronotropic), acute heart failure.

With rapid administration, there is: headache, chills, cooling of the extremities, tachycardia.

From the side of the central nervous system :anxiety, insomnia, headache, mental states, weakness, tremor, confusion, decreased attention, nausea, vomiting, anorexia.

From the respiratory system : shortness of breath, pain in the sternum and mediastinum, difficulty breathing, respiratory failure.

From the urinary system : urinary retention.

From the organs of vision : acute glaucoma (in patients with an anatomical predisposition - with the closure of the angle of the anterior chamber of the eyeball).

From the side of the immune system : in case of hypersensitivity to one of the ingredients of the drug, allergic reactions and difficulty breathing are possible.

Local reactions : irritation at the injection site or the development of necrosis (see section "Special Instructions").

Prolonged administration of a vasopressor to maintain blood pressure in the absence of recovery of circulating blood volume can cause the following side effects:

Severe peripheral and visceral angiospasm;

Decreased renal blood flow;

tissue hypoxia;

An increase in the level of lactate in the blood serum;

Decreased urine production.

In case of hypersensitivity to the action of the drug (for example, with hyperthyroidism ):

when using high or usual doses of the drug, a pronounced increase in blood pressure is observed (accompanied by headache, photophobia, stabbing retrosternal pain, pallor of the skin, increased sweating and vomiting); dyspepsia.

Overdose:

Symptoms : there may be spasms of skin vessels, collapse, anuria, a pronounced increase in blood pressure.

Treatment: if dose-dependent symptoms of an overdose appear, if possible, the dose of the drug should be reduced.

Interaction:

When using norepinephrine simultaneously with cardiac glycosides, quinidine, tricyclic antidepressants, the risk of developing arrhythmias increases.

Alpha-blockers (, labetalol, phenoxybenzamine, phentolamine, talazosin) and other drugs with alpha-blocking activity (, loxapine, phenothiazines, thioxanthenes) counteract the vasoconstrictor effect.

Means for inhalation general anesthesia (chloroform, enflurane, cyclopropane, and methoxyflurane) - the risk of developing ventricular arrhythmias.

Tricyclic antidepressants and - possibly increased cardiovascular effects, pressor action, tachycardia and arrhythmias.

Antihypertensive drugs and diuretics - a decrease in the effect of the action of norepinephrine.

β-blockers - mutual weakening of the action.

Cocaine, doxapram - mutual enhancement of hypertensive action.

MAO inhibitors, and - it is possible to lengthen and enhance the pressor effect.

Nitrates - weakening of antianginal action.

Ergot alkaloids or may enhance vasopressor and vasoconstriction effects.

Thyroid hormones - the risk of coronary insufficiency against the background of angina pectoris.

Special instructions:

Norepinephrine should only be used if adequate circulating blood volume is being replenished. Before the introduction of a diluted solution of norepinephrine, a mandatory visual control is necessary for the presence of a precipitate, turbidity or discoloration of the solution. If there are any changes, the introduction of the solution is prohibited. The solution should be colorless and transparent.

During infusion, blood pressure and infusion rate should be checked frequently (every 2 minutes) to avoid arterial hypertension.

With prolonged use of the drug, a decrease in plasma volume may be observed (correction is necessary to avoid recurrent arterial hypotension when the drug is discontinued).

Elderly patients may be particularly sensitive to the effects of norepinephrine.

If a heart rhythm disturbance occurs during infusion, the dose should be reduced.

When using norepinephrine in patients with hyperthyroidism and diabetes mellitus, care must also be taken.

Particular caution should be observed in patients with coronary, mesenteric or peripheral vascular thrombosis, as it can lead to increased ischemia and an increase in the area of ​​infarction.

For patients with arterial hypotension after myocardial infarction and patients with Prinzmetal's angina, caution is also necessary.

Risk of extravasation :

In order to reduce the risk of extravasation and subsequent tissue necrosis, it is necessary to constantly monitor the position of the needle in the vein during the introduction of norepinephrine.

The infusion site should be checked frequently for free flow (infiltration). Care must be taken to avoid leakage of the drug from the vessel (extravasation). Due to vasoconstriction of a vein with increased vascular wall permeability, leakage of norepinephrine into the tissues surrounding the vein may occur, in which case the infusion site should be shifted to reduce the effect of local vasoconstriction.

Treatment of ischemia caused by extravasation:

When norepinephrine leaks from a vessel or if injected past a vein, blanching and subsequent tissue necrosis may occur as a result of the vasoconstrictive effect of the drug on the vessels.

If the drug gets past the venous blood flow, 5-10 ml of phentolamine in 10-15 ml of saline is injected into the injection site.

Influence on the ability to drive transport. cf. and fur.:

When taking the drug, it is forbidden to drive vehicles and engage in other activities that require increased concentration of attention and speed of psychomotor reactions.

Release form / dosage:Concentrate for solution for intravenous administration, 1 mg/ml. Package:

1 ml, 5 ml or 10 ml in dark glass ampoules.

5 ampoules are in a plastic tray with cells.

Ampoules of 1 ml, 5 ml and 10 ml are packed:

2 plastic pallets with cells (10 ampoules) together with instructions for use in a cardboard pack.

Ampoules of 1 ml can be packed:

10 plastic pallets with cells (50 ampoules) together with instructions for use in a cardboard box.

Storage conditions:

Store at a temperature not exceeding 25 ° C, protected from light.

Do not freeze.

Keep out of the reach of children.

Best before date:

Do not use the drug after the expiration date indicated on the package.

Conditions for dispensing from pharmacies: On prescription Registration number: LP-003506 Date of registration: 16.03.2016 Expiration date: Close Instructions
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