title: Unusual electrocardiographic response during pulmonary balloon valvoplasty.
abstract: An 18-year-old girl with severe valvar pulmonary stenosis was subjected to balloon valvoplasty. During each inflation of the balloon, we observed transient electrocardiographic disappearance of 'R' waves in the monitoring lead. The possible explanations for this observation include sudden severe right ventricular strain and ischemia.
authors.affiliation: Department of Cardiology, All India Institute of Medical Sciences, New Delhi.
authors.forename: R S
authors.initials: RS
authors.lastname: Vasan
authors.forename: S
authors.initials: S
authors.lastname: Shrivastava
authors.forename: V
authors.initials: V
authors.lastname: Dev
mesh_terms: D000293:Adolescent; D006328:Cardiac Catheterization; D002404:Catheterization / Q000009:adverse effects*; D003327:Coronary Disease / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D006439:Hemodynamics; D006801:Humans; D011183:Postoperative Complications / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D011666:Pulmonary Valve Stenosis / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy*