Transesophageal echocardiography is used to monitor cardiac wall motion at various time points during open-heart surgery. After surgery, the measurements are made at various time points by transthoracic echocardiography. The CS1 system enables continuous, direct measurement of cardiac wall motion. This is achieved through use of temporary pacemaker wires incorporating a motion detector called an accelerometer. Use of TMEs during and after open-heart surgery is part of the normal clinical routine. Continuous monitoring of cardiac wall motion during and after surgery can quickly highlight the need for medical intervention with cardiac drugs and allow very early detection of potentially serious complications leading to abnormal cardiac wall motion. Cardiac wall motion activity registered by the CS1 system and echocardiography at specific time points during and after surgery will be analyzed to see how well they compare.
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Change from Baseline Peak Systolic Velocity (PSV) after increasing heart rate by 25 percent
Timeframe: After surgery: before extubation, while patient is in the intensive care unit (ICU)
Change from Baseline PSV after increasing heart rate by 25 percent
Timeframe: After surgery: after extubation and removal of drains, before patient is transferred from ICU to general ward