title: Unmasking of sinus node dysfunction by ajmaline.
abstract: A 75-year-old male with bifascicular block presented with recurrent giddiness and presyncope. Prolonged monitoring of the cardiac rhythm did not reveal any arrhythmia. Electrophysiological evaluation, including an ajmaline stress test, was performed. Ajmaline had an unusual effect. It reproducibly induced sinus arrest and thus unmasked a latent sick sinus syndrome.
authors.affiliation: Department of Cardiology, All India Institute of Medical Sciences, New Delhi.
authors.forename: R
authors.initials: R
authors.lastname: Bajaj
authors.forename: U
authors.initials: U
authors.lastname: Kaul
authors.forename: J
authors.initials: J
authors.lastname: Narula
mesh_terms: D000368:Aged; D000404:Ajmaline; D004562:Electrocardiography; D004594:Electrophysiology; D006801:Humans; D008297:Male; D012804:Sick Sinus Syndrome / Q000175:diagnosis* / Q000503:physiopathology
chemical_list: D000404:Ajmaline