Department of Medicine, Division of Neurology (Clinical Neurophysiology)
Division of Respirology, Queen's University and Kingston General Hospital, Kingston, Ontario, Canada
Correspondence: Michael Einspenner
Connell-7, Kingston General Hospital,
76 Stuart Street, Kingston,
ON, K7L 2V7, Canada
This case study documents a patient who experienced bradycardia brought on by flash stimulation during a routine outpatient EEG recording. The patient had known photosensitive seizures in the past. During this routine EEG, the patient's heart rate dropped to about 12 beats per minute with the EEG displaying slow-delta-frequency waves with no epileptiform spikes or sharp waves. During immediate follow-up, in our emergency department, the patient had a brief asystolic event, followed by bradycardia. Cardiology examinations were normal. We propose that this response was a photic-triggered reflex vasovagal reaction.