Ultra fraction heparin when to stop before procedure in ipd patient
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unfractionated heparin when to stop before invasive procedure guidelines 2024
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Here is a comprehensive, source-backed answer on when to stop Unfractionated Heparin (UFH) - commonly referred to as "ultra fraction heparin" in Indian clinical settings - before a procedure in an inpatient (IPD) patient:
UFH (Unfractionated Heparin) - Pre-procedure Hold Times
IV (Intravenous) Unfractionated Heparin Infusion
| Situation | Hold Time Before Procedure |
|---|---|
| General invasive procedure | Stop 4-6 hours before |
| Neuraxial procedure (epidural/spinal) | Stop 4-6 hours before + confirm aPTT/ACT is normal |
| Low bleeding-risk procedure (IR, etc.) | Stop at least 4-6 hours or when aPTT < 45 seconds |
"If intravenous unfractionated heparin is used, it should be stopped 4 to 6 hours before the procedure and normal coagulation status (PTT or activated clotting time [ACT]) documented before neuraxial instrumentation or removal of an epidural catheter." - Miller's Anesthesia, 10e
Subcutaneous (SC) UFH
| Dose | Hold Time |
|---|---|
| Low/prophylactic dose (5000 U BD/TDS) | Stop 8-12 hours before |
| Higher SC doses (>10,000 U/dose or >20,000 U/day) | Stop 12-24 hours before |
| Any SC UFH for neuraxial block | Hold time depends on dose + check aPTT |
LMWH (Low Molecular Weight Heparin - Enoxaparin/Clexane) - For Comparison
| Dose | Hold Time Before Procedure |
|---|---|
| Prophylactic dose (0.5 mg/kg OD or 40 mg OD) | 12 hours before |
| Therapeutic dose (1 mg/kg BD or 1.5 mg/kg OD) | 24 hours before |
| High bleeding-risk surgery | Give last half-dose 24 hours before; then wait 48-72 hours after to restart |
Key Points for IPD Patients
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Always check aPTT or ACT before proceeding, especially for neuraxial blocks or high-risk procedures - do not rely on timing alone for IV UFH.
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Protamine reversal is available if emergency surgery cannot wait: 1 mg protamine reverses 100 units of UFH (initial dose 25-50 mg IV slow infusion over 15-20 min). Administer by slow IV due to risk of anaphylactoid reactions.
-
Restarting heparin after procedure:
- IV UFH: restart at least 24 hours after procedure (48-72 hours for high-bleeding-risk surgery)
- SC prophylactic UFH: restart 12-24 hours post-procedure
- For neuraxial catheter removal: restart at least 1 hour after removal
-
Bridging context (e.g., warfarin-bridged patients on IV UFH): stop IV UFH 4-6 hours before procedure per ACCP guidelines (AAFP summary of ACCP guidelines).
-
Urgency: If the procedure is truly urgent and heparin cannot be held, consider protamine reversal and consult hematology.
Quick Reference Summary
| Route | Stop Before Procedure |
|---|---|
| IV UFH infusion | 4-6 hours (confirm aPTT normal) |
| SC UFH prophylactic | 8-12 hours |
| SC UFH high dose | 12-24 hours |
| LMWH prophylactic | 12 hours |
| LMWH therapeutic | 24 hours |
Sources: Miller's Anesthesia 10e; ACCP Perioperative Antithrombotic Guidelines (2023); Thrombosis Canada UFH/LMWH guide; MD Anderson Peri-Procedure Anticoagulant Algorithm (2025).
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