It is easier and faster to perform than echocardiography, but does not provide a full evaluation of the cardiac structure and function. It is more direct than the pulmonary artery catheter, but does not allow the distinct estimation of right and left cardiac function. It provides an estimation of the systolic function of the combined ventricles. It estimates the end-diastolic volume of the four cardiac cavities, which is a marker of cardiac preload. Transpulmonary thermodilution provides several variables beyond cardiac output. This provides continuous and real time monitoring of cardiac output, which is not possible with the pulmonary artery catheter. This measure allows the calibration of pulse contour analysis. Through the analysis of the thermodilution curve recorded at the tip of an arterial catheter after the injection of a cold bolus in the venous circulation, transpulmonary thermodilution intermittently measures cardiac output. Transpulmonary thermodilution is a technique that provides a full haemodynamic assessment through cardiac output and other indices. In particular, arterial pressure allows only a rough estimation of cardiac output. For complex patients in the intensive care unit or in the operating room, many questions regarding their haemodynamic management cannot be answered with simple clinical examination.
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