Idiopathic catastrophic thrombosis with happy ending

Area of Science:

• Cardiology
• Hematology
• Thrombosis Research

Background:

• A 59-year-old male presented with ST-segment elevation myocardial infarction.
• The patient had a high-risk profile for heparin-induced thrombocytopenia (HIT).

Observation:

• The patient experienced three life-threatening in-stent thromboses despite initial resuscitation and treatment.
• Argatroban therapy, used for suspected HIT after the second reinfarction, did not prevent a third reinfarction.
• Further thrombotic events included deep vein thrombosis and an intracardiac thrombus, necessitating high-risk cardiac bypass surgery.

Findings:

• Despite positive HIT screening and a single positive heparin-induced platelet aggregation test, HIT was questioned as the sole cause.
• Consistently high D-dimer levels and the requirement for substantial direct thrombin inhibitor suggest massive thrombin generation as a potential driver.
• This points to a complex thrombotic syndrome beyond typical HIT.

Implications:

• Highlights the potential for severe cardiac complications in patients with complex clotting disorders.
• Emphasizes the need for comprehensive diagnostic and therapeutic strategies in unusual thrombotic scenarios.
• Suggests considering alternative or additional prothrombotic mechanisms when standard HIT treatment fails.