Definitions that matter: adverse event, serious adverse event, SUSAR, and the distinctions between them
Master the precise definitions of AE, SAE, and SUSAR and the four independent dimensions of adverse event classification that every CRC must understand.
One headache, three questions
A participant in a clinical trial develops a headache. Is it an adverse event? Almost certainly -- any unfavourable medical occurrence in a trial participant qualifies, regardless of whether anyone believes the study drug caused it. Is it a serious adverse event? That depends on consequence: did the headache lead to hospitalization, disability, or another seriousness criterion? A pounding, miserable headache that resolves with acetaminophen is not serious. A headache that turns out to be the presenting symptom of a subarachnoid hemorrhage very much is. Is it a SUSAR? Only if it is serious, unexpected based on the Investigator's Brochure, and suspected to be related to the study intervention.