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The AE domain includes clinical data describing "any untoward medical occurrence in a patient or clinical investigation subject administered a pharmaceutical product and which does not necessarily have to have a causal relationship with this treatment" (ICH E2A). In consultation with regulatory authorities, sponsors may extend or limit the scope of adverse event collection (e.g., collecting pre-treatment events related to trial conduct, not collecting events that are assessed as efficacy endpoints). Events included in the AE domain should be consistent with protocol requirements. Adverse event terms may be captured either as free text or via a prespecified list of terms.

This is an example of a CRF used to collect all adverse experiences that occurred after informed consent is obtained. Adverse experiences were collect using free-text. 

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This SDTM dataset illustrates data collected on the example AE CRF above,  AEs were coded using MedDRA, and the sponsor’s applicant’s procedures include the possibility of modifying the reported term to aid in coding. The CRF was structured so that seriousness category variables (e.g., AESDTH, AESHOSP) were checked only when AESER is answered “Y.” In this study, the study reference period started at the start of study treatmentproduct exposure. Three AEs were reported for this subject. This SDTM dataset used AEENRF to represent ongoing events. Expected variables (e.g., AELLT, AELLTCD, AEPT, AEPTCD, AEHLT, AEHLTCD, AEHLGT, AEHLCTCD, AEBDSYCD, AESOC, AESOCCD) are not included to save space.  

The applicant also collected information about whether the event was associated with a device. These subjects did not have any device-related issues. See Section 3.3.3.4, Tobacco Product Events and Malfunctions, for an example of device-related events.