Prevalence of coronary artery spasm during dobutamine stress echocardiography.

The aim of this study was to assess the prevalence of coronary artery spasm during dobutamine stress echocardiography (DSE). Over a 9-year period (from November 2001 to October 2010) we reviewed all patients (n = 2,224) referred for DSE. Criteria for selection included patients > 18 years old who underwent DSE. We systematically analyzed all electrocardiograms obtained during DSE to detect ST-segment elevation during the examination. All patients with ST-segment elevation underwent coronary angiography. DSE was performed in 2,179 patients. ST-segment elevation was observed in 21 patients, all of whom underwent emergency coronary angiography. In 13 of these 21 patients (62%) significant coronary stenosis was observed: 6 patients with critical coronary stenosis and 7 patients with chronic coronary occlusion. The remaining 8 patients (38% of patients presenting with ST-segment elevation during DSE, 7 men, mean age 67 ± 11 years) had no significant coronary stenosis. Prevalence of coronary artery spasm during DSE was 0.4%. In conclusion, physicians should be aware that, although rare, coronary artery spasm may occur during DSE.