The Centers for Disease Control and Prevention (“CDC”) recently issued a final report in the New England Journal of Medicine (“NEJM”) that confirms a definite link between the man-made contaminant found in heparin, (i.e. over-sulfated chondroitin sulfate, [“OSCS”]) and the patients who experienced reactions. Blossom, David, etc., “Outbreak of Adverse Reactions Associated with Contaminated Heparin,” N. ENGL. J. MED. 359:25, 2674-2684 (December 18, 2008), (available at http://content.nejm.org/cgi/content/full/NEJMoa0806450.)

The CDC was the first to investigate suspected reactions among hospital patients given heparin in November of 2007. Before the contaminant was discovered, the CDC collected data on possible reactions occurring from November 19, 2007 through January 31, 2008 that met its case definition (i.e. development of symptoms within one hour after administration of heparin or the initiation of a hemodialysis session). (In its report, the CDC explained that it used this early case definition as an attempt to reduce misclassification, but recognized that in light of what is being discovered about the contaminate, “some true cases may have been misclassified as noncases.”)

The study did not report or investigate the long term effects of contaminated heparin, the cumulative effect of receiving multiple contaminated doses, delayed onset of symptoms, or the contaminate’s effect on other conditions such as heparin induced thrombocytopenia (“HIT”). Instead, the report simply confirmed that the “reported clinical features” of the limited cases it investigated “further support the conclusion that contamination of heparin with OSCS was the cause of the outbreak.”

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