Confirmation of infantile spasms resolution by prolonged outpatient EEGs.

Infantile spasms treatment response can be confirmed with a clinical history of spasm freedom and an outpatient prolonged EEG without evidence for ongoing spasms (hypsarrhythmia/electroclinical spams on EEG). Outpatient prolonged EEG, but not routine EEGs, represents an alternative to inpatient long-term monitoring for IS posttreatment EEG follow-up.