Usefulness and limitations of dobutamine-atropine stress echocardiography for the diagnosis of coronary artery disease in patients with left bundle branch block. A multicentre study

Eur Heart J. 2000 Oct;21(20):1666-73. doi: 10.1053/euhj.1999.2008.

Abstract

Background: Patients with left bundle branch block exhibit abnormal septal motion which may limit the interpretation of stress echocardiograms. This study sought to assess the diagnostic value of dobutamine-atropine stress echocardiography in left bundle branch block patients.

Methods and results: Sixty-four left bundle branch block patients (mean age 59 years, 24 men) with suspected coronary artery disease underwent dobutamine-atropine stress echocardiography and coronary arteriography. Myocardial ischaemia was defined as new or worsening wall thickening abnormalities. Coronary artery disease was quantitatively defined as a diameter stenosis >/=50% in a major epicardial artery. Rest septal motion was normal (apart from the early systolic septal notch) in 34 patients (53%) and abnormal in 30 patients (47%). Rest septal thickening was normal in 32 patients (50%) and abnormal in 32 patients (50%). All seven patients with a QRS duration >/=160 ms and an abnormal QRS axis had abnormal rest septal motion and thickening. Inter-observer agreement for ischaemia was 88%. In all but one patient disagreement was in the septum. For the anterior and posterior circulation, respectively, sensitivity was 60% (9/15) and 67% (8/12), specificity was 94% (46/49) and 98% (51/52), and accuracy was 86% (55/64) and 92% (59/64). Sensitivity for the anterior circulation tended to be better in patients with normal rest septal thickening (83% vs 44%).

Conclusions: Dobutamine-atropine stress echocardiography has excellent diagnostic specificity in left bundle branch block patients with suspected coronary artery disease. In patients with abnormal rest septal thickening, however, dobutamine-atropine stress echocardiography may lack good sensitivity for detection of coronary artery disease in the anterior circulation. Left bundle branch block patients who potentially most benefit from dobutamine-atropine stress echocardiography may initially be selected by their resting electrocardiogram.

Publication types

  • Multicenter Study

MeSH terms

  • Adult
  • Aged
  • Atropine / adverse effects
  • Bundle-Branch Block / complications*
  • Cardiotonic Agents / adverse effects
  • Coronary Disease / complications*
  • Coronary Disease / diagnostic imaging*
  • Dobutamine / adverse effects
  • Echocardiography / standards*
  • Electrocardiography
  • Exercise Test / standards*
  • False Negative Reactions
  • False Positive Reactions
  • Female
  • Humans
  • Male
  • Middle Aged
  • Myocardial Ischemia / diagnostic imaging
  • Observer Variation

Substances

  • Cardiotonic Agents
  • Dobutamine
  • Atropine