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Value of transesophageal echocardiography during complex or high-risk coronary interventions in the cardiac catheterization laboratory

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      Abstract

      The increasing complexity of coronary intervention and the limitations of hemodynamic and electrocardiographic monitoring have facilitated the introduction of new imaging techniques in the cardiac catheterization laboratory. Transesophageal echocardiography (TEE) has proved valuable for left ventricular (LV) monitoring during high-risk surgery, but its reported use in the cardiac catheterization laboratory has been limited. Accordingly, we assessed the feasibility and value of TEE during complex or high-risk coronary intervention in the catheterization laboratory.
      The TEE probe was successfully introduced in 53 of 54 (98%) attempted cases. The primary imaging goals were LV monitoring in 39 (74%), left main coronary artery (LMCA) imaging in 9 (17%) and both in 5 (9%) cases. LV monitoring was successful in 43 of the 44 (98%) attempted cases. In 25 (58%) of these, additional important observations were made by TEE that were not apparent by symptoms, or hemodynamic, electrocardiographic or radiographic monitoring. These included unexpected changes in regional myocardial function (n = 20), alteration in LV size (n = 2), exclusion of considered pericardial tamponade (n = 2) and detection of unsuspected mitral regurgitation (n = 1). Management of the interventional procedure was directly influenced by the findings of TEE in 11 of the 43 (26%) monitored cases. The LMCA was successfully visualized in 13 of the 14 (93%) attempted cases. In 11 of these, measurement of the stenotic lesion diameter by TEE correlated well with quantitative angiography both before (r = 0.83, standard error of the estimate = 0.01, p < 0.002) and after (r = 0.80, standard error of the estimate = 0.03, p < 0.005) intervention. All patients tolerated TEE well without complications.
      TEE during complex or high-risk coronary intervention is a feasible, safe and valuable tool for rapid detection of altered myocardial function and thus may influence clinical decisions during interventional procedure. In patients undergoing LMCA intervention, TEE accurately measures stenotic lesion diameter before and after intervention, providing a feasible noninvasive means for follow-up.
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