Termination patterns of stimulus-induced rhythmic, periodic, or ictal patterns and spontaneous electrographic seizures

Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) are rhythmic, periodic, or ictal-appearing patterns consistently elicited by stimulation of the patient (i.e. suctioning, physical examination of the patient, noxious stimulation, or sudden ambient noise) (Hirsch et al., 2004). They are a relatively common finding in the critically ill, with reported prevalence of 10–34% (Braksick et al., 2016; Hirsch et al., 2004; Ong et al., 2012). The reported causes of SIRPIDs include intracerebral hemorrhage, traumatic brain injury, anoxic brain injury, metabolic disturbances, and drug toxicity amongst other etiologies (Braksick et al., 2016).

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