Detecting exercise-induced ischemia in left bundle branch block using the electrocardiogram.
We compared 12-lead electrocardiographic changes during exercise in 41 patients with left bundle branch block; 7 were nonischemic and 34 had coronary artery obstruction > or =70% as detected by angiogram. ST depression of > or =0.5 mm from baseline when measured at the J point in leads II and AVF (p=0.004) and an increase of R-wave amplitude in lead II (p=0.05) significantly identified ischemia.
Memorial Heart Institute, Long Beach, California 90801, USA.
N S
NS
Ibrahim
G
G
Abboud
R S
RS
Selvester
J M
JM
Hagar
M H
MH
Ellestad
D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000209:etiology; D004562:Electrocardiography; D005080:Exercise Test / Q000009:adverse effects*; D006801:Humans; D017202:Myocardial Ischemia / Q000175:diagnosis* / Q000209:etiology; D011379:Prognosis; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity