手术中用三维经食道超声心动图测量心输出量的准确性和可行性

背景本研究中，我们试图用三维经食道超声心动图（3DTEE）确定心输出量，并评价其在手术中应用的可行性。方法同时用3DTEE和热稀释．法测定20例行心脏手术的患者在临床上稳定的体外循环前期时的心输出量。结果用这2种方法测定心输出量之间的相关系数是0．86。3DTEE的平均偏差是0．27L／min，范围是一1．64—2．17L／min（一致性为±35％）。平均三维数据采集时间为43秒，数据后处理时间为7分钟。结论可以用3DTEE来测量心输出量，并且这种方法在围手术期是可行的。虽然这种方法同热稀释法相比差异有显著性，且一致性较差，但是与热稀释法有很好的相关性。

BACKGROUND： In this pilot study, we attempted to validate three-dimensional transesophageal echocardiography （3DTEE） cardiac output and assess its feasibility intraoperatively. METHODS： Twenty patients undergoing cardiac surgery underwent simultaneous cardiac output determinations during the clinically stable prebypass period by 3DTEE and thermodilution. RESULTS： The correlation coefficient between cardiac output measured by the two methods was 0. 86. The 3DTEE mean bias was 0. 27 L/min, limits of agreement - 1.64 to 2.17 L/rain （approximately ±35% ）. Three- dimensional data acquisition averaged 43 s; postprooessing took 7 min. CONCLUSIONS： Three-dimensional TEE can measure cardiac output and is feasible perioperatively. Measurements have good correlation with thermodiludon, though with a significant bias and wide limits of agreement.