Heparin is administered subcutaneously, intravenously (bolus or drip).
Heparin is prescribed in the form of continuous intravenous infusion or in the form of regular intravenous injections, as well as subcutaneously (in the abdomen).
Heparin sodium can not be administered intramuscularly because of the risk of developing intramuscular hematomas.
Subcutaneous injections are preferably performed in the region of the anterolateral wall of the abdomen (in exceptional cases, inserted into the upper region of the shoulder or thigh), using a thin needle,which should be injected deeply, perpendicularly, into the fold of the skin held between the thumb and forefinger until the end of the solution. Each time, alternate injection sites (to avoid the formation of a hematoma). The first injection should be performed 1-2 hours before the operation, in the postoperative period - administered within 7-10 days, and if necessary - for a longer time.
The initial dose of heparin sodium, administered for medicinal purposes, is usually 5000 ME and is administered intravenously, after which the treatment is continued using subcutaneous injections or intravenous infusions.
Supporting doses are determined depending on the method of application:
with continuous intravenous infusion, appoint 1000-2000 IU / h (24000-48000 IU / day), diluting heparin with 0.9% sodium chloride solution; with regular intravenous injections appoint 5000-10000 ME heparin every 4-6 hours;
when administered subcutaneously every 12 hours to 15,000-20,000 ME or every 8 hours to 8000-10000 ME.
Laboratory monitoring of efficacy and safety of heparin sodium therapy. The dose of sodium heparin must be adjusted on the basis of laboratory indicators of blood coagulability.When sodium heparin is used, it is necessary to monitor activated partial thromboplastin time (APTT) or coagulation time (VSC). The administered dose of sodium heparin is considered adequate if the APTT is 1.5-2.5 times higher than the control values โโor if the patient's VSK is 2.5-3.0 times higher than the control values.
With continuous intravenous infusion of sodium heparin, it is recommended to determine the initial APTT, then determine the APTT every 4 hours, then increase or decrease the rate of infusion of sodium heparin until the target APTT level is reached (1.5-2.5 times higher than the norm), further define APTT every b hours.
When bolus intravenous administration of heparin sodium, it is recommended to determine the initial APTT, then determine the APTT before each bolus injection with a subsequent increase or decrease of the administered dose of sodium heparin.
With subcutaneous administration of heparin sodium, APHT control is recommended 4-6 hours after injection, followed by an increase or decrease in the dose of heparin sodium administered.
With subcutaneous administration of small doses of sodium heparin (5000 ME 2-3 times a day) for the prevention of thrombus formation, it is not necessary to regularly monitor the APTT, it increases slightly.
Continuous intravenous infusion is the most effective way of using sodium heparin, better than regular (periodic) injections, because provides more stable hypocoagulation and less often causes bleeding.
The use of heparin sodium in special clinical situations.
Primary percutaneous coronary angioplasty in acute coronary syndrome without segment elevation ST and with myocardial infarction with segment elevation ST: heparin sodium is administered intravenously bolus in a dose of 70-100 IU / kg (unless the use of inhibitors of glycoprotein IIb/IIIa receptors) or in a dose of 50-60 IU / kg (when combined with inhibitors of glycoprotein IIb/IIIa receptors). Thrombolytic therapy for myocardial infarction with segment elevation ST: heparin sodium is administered intravenously bolus in a dose of 60 IU / kg (maximum dose of 4000 ME), followed by intravenous infusion at a dose of 12 IU / kg (not more than 1000 IU / hour) for 24-48 hours. The target level of APTT is 50-70 seconds or 1.5-2.0 times higher than normal; Control of APTT at 3, 6, 12 and 24 hours after initiation of therapy.
Prevention of thromboembolic complications after surgical interventions using low doses of heparin sodium: heparin sodium is injected subcutaneously, deep into the fold of the abdominal skin.Initial dose of 5000 ME 2 hours prior to the beginning of the operation. In the postoperative period: 5000 ME every 8-12 hours for 7 days or until the patient's mobility is completely restored (whichever comes first). When sodium heparin is used in low doses for the prevention of thromboembolic complications, it is not necessary to control the APTT.
Application in cardiovascular surgery in operations using extracorporeal circulation systems: the initial dose of heparin sodium is not less than 150 IU / kg body weight. Further heparin sodium is introduced by continuous intravenous infusion at a rate of 15-25 drops / min to 30,000 ME per 1 liter of infusion solution. The total dose of heparin sodium is usually 300 IU / kg body weight (if the expected duration of the operation is less than 60 minutes) or 400 IU / kg body weight (if the estimated duration of the operation is 60 minutes or more).
Application for hemodialysis. The initial dose of sodium heparin: 25-30 IU / kg (or 10,000 ME) intravenously bolus, then a continuous infusion of 20,000 IU of sodium heparin / 100 ml of a 0.9% solution of sodium chloride at a rate of 1500-2000 IU / h (unless otherwise specified in the guidelines for the use of hemodialysis systems).
Transition to warfarin therapy: To ensure a stable anticoagulant effect, heparin sodium should be continued in full dose until a stable target level of INR (international normalized ratio) is reached. After this, the administration should be stopped.
Transition to dabigatran therapy: Continuous intravenous administration of heparin sodium should be discontinued immediately after the first dose of dabigatran. With fractional intravenous administration, the patient must take the first dose of dabigatran within 1-2 hours before the scheduled administration of a regular dose of heparin sodium.
Use of heparin sodium in pediatrics. Adequate controlled trials of the use of heparin sodium in children have not been conducted. These recommendations are based on clinical experience.
Initial dose: 75-100 IU / kg intravenously bolus for 10 minutes.
The maintenance dose: children aged 1-3 months - 25-30 IU / kg / h (800 IU / kg / day), children aged 4-12 months - 25-30 IU / kg / h (700 IU / kg / day), children older than 1 year -18-20 IU / kg / hour (500 IU / kg / day) intravenously drip.
The dose of heparin sodium should be selected taking into account the parameters of blood coagulation (the target level of APTT is 60-85 sec).
The duration of therapy depends on the indications and the way of application.For intravenous use, the optimal treatment duration is 7-10 days then continue therapy with oral anticoagulants (oral anticoagulants recommended to appoint, starting from 1 day of treatment with sodium heparin or 5 to day 7, while use of sodium heparin stop for 4-5 days of combination therapy). With extensive thrombosis of the ileum-femoral veins, it is advisable to conduct longer-term courses of treatment with sodium heparin.
Elderly patients
Persons older than 60 years of age (especially in women) increased the risk of bleeding, in connection with which the dose of heparin sodium in these patients should be reduced.