The investigated device consists of a newly developed, commercially available transesophageal echocardiography system. The ImaCor ClariTEE technology (hTEE) device produces a single-plane two-dimensional image and has color Doppler capability (IMACOR, New-York NY, USA). The ImaCor probe is a 5.5 mm detachable probe; due to its small size it can remain in situ for up to 72h and therefore allows for reassessment of the patient's hemodynamic progress and the effect of selected interventions at any time. The probe has to be disposed after 72h for hygienic reasons. The probe is connected to a dedicated echocardiographic system which allows the recording of digital loops and performance of basic two-dimensional measurements of areas and distances. It provides a robust, but more rapid and user-friendly approach to monitoring hemodynamic status and cardiac function than conventional TTE/TEE.