03/01/2026
HEPARIN INJECTION: QUICK NURSING GUIDE
WHAT IS HEPARIN?
Critical anticoagulant that prevents clot formation and extension. Inhibits thrombin and factor Xa to stop blood coagulation cascade. Used for DVT, PE, acute coronary syndromes, atrial fibrillation, during dialysis, and to prevent clot formation in critically ill patients.
CRITICAL SAFETY RULES (NEVER BREAK!)
1. NEVER flush arterial lines with heparin; use saline only (prevents hemorrhagic stroke)
2. Check aPTT BEFORE every dose adjustment to prevent over-anticoagulation
3. NEVER give IM injections as they cause hematomas
4. Have PROTAMINE SULFATE at bedside as it is the reversal agent for life-threatening bleeding
5. DOUBLE-CHECK concentration since it comes in multiple strengths (fatal errors common!)
6. Use IV PUMP only, never gravity drip (precise dosing critical)
ADMINISTRATION METHODS
BOLUS DOSING: For DVT/PE give 80 units/kg IV push (max 10,000 units). For ACS give 60 units/kg IV push (max 4,000 units). Give over 1 minute via IV push.
CONTINUOUS INFUSION: For DVT/PE give 18 units/kg/hour. For ACS give 12 units/kg/hour. Adjust based on aPTT results. Use programmable IV pump with guardrails.
SUBCUTANEOUS (prophylaxis only): 5,000 units SC every 8 to 12 hours. Abdomen or thigh, rotate sites.
PREPARATION
Standard concentrations: 25,000 units in 250ml = 100 units/ml or 25,000 units in 500ml = 50 units/ml. Compatible with NS or D5W.
ONSET & DURATION
Onset: Immediate (IV), 20 to 60 minutes (SC). Peak effect: 2 to 4 hours. Duration: 4 to 6 hours after discontinuation. Half-life: 1 to 2 hours (dose-dependent).
MONITORING ESSENTIALS
aPTT every 6 hours until stable, then daily (goal: 1.5 to 2.5× control). Baseline CBC, PT/INR, aPTT before starting. Platelet count every 2 to 3 days (watch for HIT!). Monitor for signs of bleeding every shift. Check all stools and urine for occult blood. Assess infusion site for patency. Neuro checks if neuraxial procedure recent.
KEY CONTRAINDICATIONS
Active major bleeding. Severe thrombocytopenia (platelets below 50,000). History of HIT (heparin-induced thrombocytopenia). Recent CNS/spinal/eye surgery. Uncontrolled severe hypertension (above 200/120). Bacterial endocarditis. Hemophilia or bleeding disorders.
COMMON SIDE EFFECTS
Bleeding (minor: bruising, epistaxis, hematuria). Injection site reactions. Elevated liver enzymes (transient). Mild thrombocytopenia. Hypersensitivity reactions. Alopecia (with prolonged use). Osteoporosis (long-term use).
DRUG INTERACTIONS
⚠️ DANGEROUS with antiplatelet agents (aspirin, clopidogrel)
⚠️ NSAIDs increase bleeding risk significantly
⚠️ Warfarin should be overlapped carefully during transition
⚠️ Thrombolytics contraindicated concurrently
⚠️ Glycoprotein IIb/IIIa inhibitors require dose reduction
SPECIAL POPULATIONS
ELDERLY: Higher bleeding risk, especially women over 60. May need lower doses. More careful monitoring required.
RENAL IMPAIRMENT: Heparin safe in renal failure (not renally cleared). Preferred over LMWH in severe renal disease.
OBESITY: Use actual body weight for bolus. Consider weight-based dosing caps for safety.
TARGET aPTT RANGE
Goal: 1.5 to 2.5× control value (typically 60 to 80 seconds if control is 30 seconds). Anti-Xa levels 0.3 to 0.7 units/ml if aPTT unreliable.
WHAT TO REPORT IMMEDIATELY
aPTT above 100 seconds or above 3× control. Any signs of major bleeding (GI, intracranial, retroperitoneal). Platelet drop above 50% from baseline (HIT concern!). Sudden severe back pain (retroperitoneal bleed). Neuro changes or severe headache (ICH). Chest pain or dyspnea (PE despite treatment). Black tarry stools or coffee-ground emesis. Hematuria or vaginal bleeding.
HEPARIN-INDUCED THROMBOCYTOPENIA (HIT)
LIFE-THREATENING EMERGENCY! Occurs 5 to 10 days after starting heparin. Platelet count drops more than 50% from baseline. STOP all heparin immediately (including flushes!). Switch to alternative anticoagulant (argatroban, bivalirudin). HIGH risk of thrombosis, not just bleeding. Never rechallenge with heparin.
REVERSAL
PROTAMINE SULFATE: 1mg protamine neutralizes 100 units heparin. Give slowly over 10 minutes (max 50mg). Monitor for hypotension and bradycardia. May cause anaphylaxis.
REMEMBER: Heparin = HIGH ALERT medication. ALWAYS use two-person verification for bolus doses and concentration changes. Check platelets regularly for HIT!
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