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1 From the Cardiovascular Division, Washington University School of Medicine, St. Louis
Objectives: To compare cardiac output and stroke volume measured by multiplane transesophageal Doppler echocardiography with that measured by the thermodilution technique.
Design: Prospective direct comparison of paired measurements by both techniques in each patient.
Setting: Cardiac surgery and myocardial infarction intensive care units.
Patients: Twenty-nine patients, mean age (±SD) 67±8 years. Nineteen had undergone open heart surgery and 10 had suffered acute myocardial infarction.
Methods: Cardiac output and stroke volume were measured simultaneously by the thermodilution technique and multiplane transesophageal Doppler echocardiography via the transgastric view (119±8°) with the sample volume positioned at the level of the left ventricular outflow tract.
Results: Stroke volume and cardiac output measurements were obtained in 29 of 33 patients (88%). Mean values were 50±13 mL and 4.8±1.3 L/min by Doppler and 51±14 mL and 4.9±1.4 L/min by thermodilution (r=0.90, r=0.91, p<0.00l). The mean differences in values obtained with the two techniques were 1±6 mL (2±12%) and 0.1±0.7 L/min (2±12%).
Conclusions: Multiplane transesophageal echocardiography enhances the ability to estimate accurately cardiac output and stroke volume by providing new access to left ventricular outflow tract in critically ill patients.
Key Words: transesophageal echocardiography • cardiac output • stroke volume • Doppler echocardiography
Submitted on March 24, 1994
Accepted on July 27, 2007
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