Heparin Contraindications and Precautions

Absolute Contraindications

The American College of Cardiology recommends that patients with a history of thrombocytopenia induced by heparin (TIH) or severe thrombocytopenia with a positive in vitro test for antiplatelet antibodies should not receive heparin therapy, due to the risk of paradoxical thrombosis 1
Patients aged 90 years or older with a creatinine clearance of less than 60 mL/min should not receive tinzaparine, a type of low molecular weight heparin, due to the increased risk of bleeding 1

The American Heart Association suggests that patients with active major bleeding, hepatic insufficiency with an elevated INR (>1.5), or uncontrolled hypertension (systolic >200, diastolic >110) should use heparin with caution, as these conditions may increase the risk of bleeding complications 1
Patients with severe renal insufficiency should use heparin with extreme caution, due to the increased risk of bleeding and the need for close monitoring of coagulation parameters 1
The European Society of Cardiology recommends that patients with thrombocytopenia of any origin should be actively monitored while receiving heparin therapy, due to the increased risk of bleeding complications 1

In cases where heparin is contraindicated, such as in patients with TIH, alternative anticoagulants like argatroban, a direct thrombin inhibitor, may be preferred, especially in patients with severe renal insufficiency 3
Bivalirudin, a short-acting direct thrombin inhibitor, may be useful for procedures requiring short-term anticoagulation, while fondaparinux, an anti-Xa inhibitor, may be an option for stable patients without severe renal or hepatic insufficiency 3

The American College of Chest Physicians recommends that patients with sepsis and coagulopathy should use mechanical compression devices as an alternative to heparin, due to the increased risk of bleeding complications 5
In cases of acute limb ischemia with a history of TIH, a direct thrombin inhibitor may be administered instead of heparin, due to the increased risk of paradoxical thrombosis 6