The purpose of this observational study is to evaluate the role of hTEE in clinical decision-making in 30 patients recruited from OR-Trauma and in 30 patients from the Cardiovascular-OR. Hemodynamic trans-esophageal echocardiography (hTEE) incorporates an FDA-approved miniaturized, disposable probe for continuous use in patients for up to 72 hours. This device has been used for postoperative assessment in the ICU for several years with successful placement of probes and without any adverse incidents.