title: Cardiac Resynchronization Therapy Relieves Intractable Angina Due to Exercise-Induced Left Bundle Branch Block Without Left Ventricular Systolic Dysfunction: A Detailed Case Study.
abstract: Exercise-induced left bundle branch block is rare and can be demonstrated with exercise testing. When the heart rate reaches a certain threshold, the QRS widens into left bundle branch block. This paper describes a patient with exercise-induced left bundle branch block related angina and dyspnea, who responded to cardiac resynchronization therapy. We documented the potential benefits of cardiac resynchronization therapy with a left ventricular rapid pacing study prior to its implantation. Although exercise-induced left bundle branch block is not a current indication for cardiac resynchronization therapy in patients such as ours, it could be considered when conventional drug therapy fails.
authors.affiliation: Cardiology Clinical Academic Group, St. George's University Hospitals NHS Foundation Trust, London, UK.|Department of Cardiology, University of Debrecen Medical Center, Debrecen, Hungary.
authors.forename: Daniel
authors.initials: D
authors.lastname: Czuriga
authors.affiliation: Cardiology Clinical Academic Group, St. George's University Hospitals NHS Foundation Trust, London, UK.
authors.forename: Pitt O
authors.initials: PO
authors.lastname: Lim
mesh_terms: D000200:Action Potentials; D000787:Angina Pectoris / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy*; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy*; D058406:Cardiac Resynchronization Therapy; D017023:Coronary Angiography; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D015444:Exercise; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D016896:Treatment Outcome; D016277:Ventricular Function, Left
keywords: angina; cardiac resynchronization therapy; exercise-induced left bundle branch block