CLINICAL RESEARCH: STRESS IMAGING
Safety of dobutamine stress real-time myocardial contrast echocardiography
Jeane M. Tsutsui, MD,
Abdou Elhendy, MD, FACC,
Feng Xie, MD,
Edward L. O’Leary, MD, FACC,
Anna C. McGrain, RN, BSN and
Thomas R. Porter, MD, FACC*
Department of Internal Medicine, Section of Cardiology, University of Nebraska Medical Center, Omaha, Nebraska.
Manuscript received November 3, 2004;
revised manuscript received December 9, 2004,
accepted January 4, 2005.
* Reprint requests and correspondence: Dr. Thomas R. Porter, University of Nebraska Medical Center, 981165 Nebraska Medical Center, Omaha, Nebraska 68198-1165. (Email: trporter{at}unmc.edu).
OBJECTIVES: The aim of this study was to determine the safety of dobutamine stress myocardial perfusion imaging (MPI) obtained by real-time contrast echocardiography (RTCE) and intravenous ultrasound contrast in a large cohort of patients with suspected coronary artery disease (CAD).
BACKGROUND: Despite the increasing number of studies showing the potential clinical utility of myocardial contrast perfusion imaging with commercially available contrast agents, the safety of this technique in a clinical setting has not been demonstrated.
METHODS: Over a four-year period, 1,486 patients underwent dobutamine stress RTCE with low mechanical index pulse sequence schemes after intravenous injections of commercially available contrast agents (35% Definity, Bristol Myers Squibb Medical Imaging Inc., North Billerica, Massachusetts; 65% Optison, GE-Amersham, Princeton, New Jersey). The hemodynamic and adverse effects of RTCE were compared with 1,012 patients who underwent conventional dobutamine stress echocardiography (DSE) without contrast. The feasibility of image analysis was defined as the ability to analyze MPI in at least two of the three standard segments in each left ventricular wall.
RESULTS: No myocardial infarction or death occurred during dobutamine stress. There was no difference in the incidence of nonsustained ventricular tachycardia, sustained ventricular tachycardia, or supraventricular tachycardia during dobutamine infusion between RTCE and DSE. Myocardial perfusion imaging was considered feasible for analysis in 94% of the walls at baseline and 95% at peak stress. The anterior, lateral, and posterior walls were the most common regions in which MPI was not feasible. Myocardial perfusion imaging with RTCE had a higher accuracy for detecting patients with angiographically significant CAD than the analysis of wall motion (84% vs. 66%, respectively; p < 0.001).
CONCLUSIONS: Dobutamine stress RTCE appears to be a safe and feasible technique for evaluating patients with known or suspected CAD.
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Abbreviations and Acronyms
| | CAD = coronary artery disease | | DSE = dobutamine stress echocardiography | | FDA = Food and Drug Administration | | LV = left ventricular | | MPI = myocardial perfusion imaging | | PVC = premature ventricular complexes | | RTCE = real-time contrast echocardiography | | WMA = wall motion abnormalities |
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