Thrombotic thrombocytopenic purpura: yesterday, today, tomorrow.

Although much has been learned about the pathophysiologic process of thrombotic thrombocytopenic purpura (TTP), both diagnostically and therapeutically, since its initial description by Moschcowitz in 1924, its etiology and treatments remain, in many instances, problematic. Thrombotic thrombocytopenic purpura remains a rare entity whose etiology is usually unknown, but several drugs and infections have now been implicated in its development (i.e. Cyclosporine A, Mitomycin-C, Ticlopidine, Simvastatin, Lipitor, Plavix, FK 506, Rapamune (sirolimus), HIV). Although its treatment by plasma exchange has gained worldwide acceptance since the late 1970s, the optimal exchange media is not known, nor the volume and duration of exchange therapy, nor appropriate salvage therapy(ies). Without the benefit of randomized controlled trials, its treatment, to a large extent, remains not evidence-based but 'eminence-based', making the same mistakes with increasing confidence over an impressive number of years.

Myocardial infarction/injury is relatively common at presentation of acute thrombotic thrombocytopenic purpura: the Indiana University experience.

Although widespread vascular thrombosis is common in thrombotic thrombocytopenic purpura (TTP), there have been no prospective studies on the extent of injury to specific organs. Following successful resuscitation and plasma exchange of an index patient with widespread organ dysfunction, cardiogenic shock, and elevated cardiac troponin-I levels, we prospectively studied and identified 2 more individuals (of 10 consecutive patients) with evidence of myocardial injury/infarction at presentation of acute TTP. These data suggest that cardiac troponin-I measurements should be considered during initial evaluation of all patients with acute TTP.