Automated Inferior Vena Cava Collapsibility Index Fluid Responsiveness in Ventilated Patients After Cardiac Surgery.

Patients will be place in supine position. view: subcostal view, importantly supine is standard position for IVC measurement, the IVC is larger in the right lateral decubitus position and vice versa, alternatively directly through a transhepatic approach. Measures will be performed in the two dimensional mode close to the hepatic vein (1 - 3cm from the IVC connection to the right atrium). The IVC will be measured by MM-Mode manually and with the automated mode (both measures will be recorded. In the manual mode this measure requires concurrent utilization of M-Mode and two dimensional mode