Copyright © 2000 by the European Society of Cardiology.
Head to head comparison of dobutamine–transoesophageal echocardiography and dobutamine–magnetic resonance imaging for the prediction of left ventricular functional recovery in patients with chronic coronary artery disease
a Klinik III für Innere Medizin, der Universität zu Köln, Köln, Germany
b Klinik und Poliklinik für Nuklearmedizin, der Universität zu Köln, Köln, Germany
accepted October 1, 1999
Abstract
Aims A substantial number of patients with dysfunctional but potentially viable myocardium cannot be accurately evaluated by transthoracic echocardiography due to a poor acoustic window. This study compares the diagnostic value of alternative functional imaging techniques, such as dobutamine–transoesophageal echocardiography (dobutamine–TEE) and dobutamine magnetic resonance imaging (dobutamine–MRI) for the detection of viable myocardium and the prediction of left ventricular functional recovery in patients with chronic coronary artery disease following successful revascularization procedures.
Methods and Results Rest and low-dose (5, 10µg dobutamine.min–1.kg–1) multiplane dobutamine–TEE and ultrafast cine–MRI studies were performed in 103 patients. Contractile recovery of an infarct region was predicted if a dobutamine contraction reserve could be assessed visually by TEE or MRI in 
50% of infarct-related a- or dyskinetic segments. Revascularization of the infarct-related vessel was successful in 88 patients, and 4·9±0·7 months later 52 patients still had an angiographically controlled open target vessel. These patients underwent another rest MRI study to assess left ventricular functional recovery. A dobutamine contraction reserve was observed in 27/52 (52%) patients by TEE and in 26/52 (50%) patients by MRI. Functional improvement of the infarct region was diagnosed in 28/52 (54%) patients. The positive and negative predictive accuracy of dobutamine–TEE and dobutamine–MRI for the prediction of left ventricular functional recovery was not significantly different (85% vs 92%, ns and 80% vs 85%, ns). Diagnosis of a predominantly viable infarct region by TEE and MRI predicted a significant increase in left ventricular ejection fraction (TEE: 12±8% vs 2±7%P<0·001, MRI: 13±7% vs 2±7%, P<0·001) compared to infarct regions graded as scar.
Conclusion A qualitative visual analysis of TEE and MRI viability studies is highly accurate for the prediction of left ventricular functional recovery in patients with dysfunctional myocardium and proved to be a clinically valuable alternative if transthoracic dobutamine–echocardiography is unsuitable. To date, TEE is cardiologists' preferred choice for the assessment of myocardial viability but MRI may become significantly more attractive with increasing local availability and experience.
Key Words: Myocardial infarction, dobutamine, transoesophageal echocardiography, magnetic resonance imaging, viability
f1 Correspondence: Frank Michael Baer, MD, Klinik III für Innere Medizin, Universität zu Köln, Joseph-Stelzmann-Str. 9, D-50924 Köln, Germany.
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