Aptt target range in heparin infusion in Acs / Nstemi / Dvd pt planed for pci
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2025 ACS guideline unfractionated heparin aPTT target range PCI
For an NSTEMI/ACS patient on IV unfractionated heparin (UFH) awaiting PCI:
- aPTT target: usually 1.5-2.0 times the laboratory control, commonly about 50-70 seconds.
- Some hospital nomograms use 1.5-2.5 times control. The best target is the range calibrated by your laboratory to an anti-Xa level of 0.3-0.7 IU/mL.
- Check aPTT about 6 hours after starting or changing the infusion, then titrate according to the local UFH nomogram.
At the time of PCI: anticoagulation is generally managed with an additional UFH bolus and ACT monitoring, not by the ward aPTT:
- UFH 70-100 units/kg IV if no GP IIb/IIIa inhibitor, aiming ACT roughly 250-300 s
- UFH 50-70 units/kg IV if a GP IIb/IIIa inhibitor is used, aiming ACT roughly 200-250 s
Do not use a fixed aPTT number without checking the institution’s ACS/PCI protocol, bleeding risk, platelet count, baseline aPTT, and whether the patient has received enoxaparin or another anticoagulant. Double-vessel disease does not itself require a higher aPTT target. Recent evidence continues to compare UFH with bivalirudin for ACS PCI, rather than support a different UFH aPTT range (2025 systematic review, PMID 39930484).
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