The potential role of complements in cocaine-induced thrombotic microangiopathy

Cocaine-Induced Four-Extremity Ischemia Caused by a Hypercoagulable State

The use of cocaine is associated with serious complications including coronary vasospasm and myocardial, renal, intestinal, and neurological ischemia. Among these feared complications lies limb ischemia which is a rare potential side effect of chronic cocaine use. We present the case of a 50-year-old female with an extensive history of cocaine use who developed ischemia in all four limbs. Imaging studies revealed pulmonary emboli, multisystem thromboses, and microhemorrhages in the brain. Laboratory studies were significant for leukocytosis, thrombocytopenia, schistocytes on blood smear, and normal rheumatologic and hematologic studies. The patient was diagnosed with cocaine-induced thrombotic microangiopathy and she was treated symptomatically and with continuous heparin infusion. However, she ultimately requested to be discharged home and was lost to follow-up. Cocaine-induced thrombotic microangiopathy has been reported in only a few other patients to date and although there are some theories describing the possible pathophysiology, a clearly defined explanation has not yet been widely accepted.

Cocaine-associated atypical haemolytic uraemic syndrome in a genetically susceptible individual

Atypical haemolytic uraemic syndrome (aHUS) is a severe, life-threatening condition that requires early recognition and urgent treatment. In aHUS rare genetic variants in CFH, CFI, CD46, C3 and CFB predispose to complement over activation. This case describes a case of aHUS in which there was a strong temporal association between disease onset and the use of smoked cocaine. The patient was found to have a rare genetic variant in the CFI gene which may have been unmasked by first-time exposure to cocaine. The patient stabilized and improved with early administration of eculizumab, supporting the notion of an underlying immunological pathogenesis and the importance of early intervention.

Acute kidney injury secondary to thrombotic microangiopathy associated with idiopathic hypereosinophilic syndrome: a case report and review of the literature

Background

Renal involvement in idiopathic hypereosinophilic syndrome is uncommon. The mechanism of kidney damage can be explained as occurring via two distinct pathways: (1) thromboembolic ischemic changes secondary to endocardial disruption mediated by eosinophilic cytotoxicity to the myocardium and (2) direct eosinophilic cytotoxic effect to the kidney.

Case presentation

We present a case of a 63-year-old Caucasian man who presented to our hospital with 2 weeks of progressively generalized weakness. He was diagnosed with idiopathic hypereosinophilic syndrome with multiorgan involvement and acute kidney injury with biopsy-proven thrombotic microangiopathy. Full remission was achieved after 8 weeks of corticosteroid therapy.

Conclusion

Further studies are needed to investigate if age and absence of frank thrombocytopenia can serve as a prognostic feature of idiopathic hypereosinophilic syndrome, as seen in this case.