Copyright © 1999 by the European Society of Cardiology.
Prevalence and significance of left ventricular outflow gradient during dobutamine echocardiography
Department of Cardiology, Jesselson Heart Center, Shaare Zedek Medical Center, Jerusalem, Israel
revised September 22, 1998; accepted October 7, 1998
Abstract
Aims
This study investigated the clinical and physiological significance of the dynamic left ventricle outflow gradient observed in some patients during dobutamine stress echocardiography.
Methods
Three hundred and ninety-four consecutive patients completed dobutamine stress echocardiography using Doppler echocardiography to assess the presence of myocardial ischaemia and left ventricular outflow gradient. The prevalence of left ventricular outflow gradient was evaluated and correlated with echocardiographic and clinical findings. Fifteen patients with left ventricular outflow gradient during dobutamine infusion underwent exercise echocardiography for appearance of left ventricular outflow gradient.
Results
Sixty-nine of 394 (17·5%) patients developed a left ventricular outflow gradient of more than 36mmHg. In nine of them (13%) the anterior mitral valve leaflet had a systolic anterior motion. In 60 of the 69 patients (87%) there was a dynamic obstruction at the level of the papillary muscles. The mean intracavitary gradient was 75·4 (range 36–175)mmHg.There was no correlation between the presence or absence of a dobutamine stress echocardiography-induced left ventricle outflow gradient and chest pain or shortness of breath. In patients who developed a left ventricular outflow gradient ischaemic wall motion abnormalities occurred at a significantly lower frequency during dobutamine stress echocardiography (2·9 vs 16·4%P<0·001).None of the 15 patients who underwent exercise echo-cardiography developed significant left ventricular outflow gradient.
Conclusion
Left ventricular outflow gradient occurs occasionally during dobutamine stress echocardiography examination. Its presence is of no physiological or clinical significance.
Key Words: Dobutamine echocardiography • left ventricular outflow gradient
f1 Correspondence:Marc W. Klutstein, MD, Department of Cardiology, Jesselson Heart Center, Shaare Zedek Medical Center, POB 3235, Jerusalem 91031, Israel.
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