View clinical trials related to Cerebral Perfusion.
Filter by:The aim of our study is to observe the effect of head-neck position of patients scheduled for thyroidectomy, on carotid artery blood flow, regional cerebral oxygen saturation measured using near-infrared spectroscopy technology, and postoperative cognitive dysfunction.
This prospective interventional study investigates transpharyngeal sonography (TPS) as an additional neuromonitoring strategy to assess cerebral perfusion during cardiovascular surgery. In the first part of the study the investigators will investigate the feasibility of TPS for visualization of aortic arch branches including the innominate and the carotid arteries in patients undergoing cardiac surgery with cardiopulmonary bypass. In the second part the investigators plan to adopt the investigators previous experiences on TPS to a selected population of patients undergoing ascending aortic and/or arch repair in hypothermic circulatory arrest (HCA).
Measuring brain perfusion is biased by a inter- and intrasubject variability, caused by physiological and lifestyle factors. In this study, the investigators want to investigate the effects of a different mood state (neutral, positive and negative mood), induced using subjects own memories, on both global and regional cerebral perfusion, measured with arterial spin labeling.
The purpose of this study is to determine whether cerebral blood flow and cerebral tissue oxygenation is most dependent on cardiac output or on mean arterial pressure in patients undergoing cardiac surgery with the use of cardiopulmonary bypass.
Extracorporeal membrane oxygenation (ECMO) is progressively used in critically ill patients with cardiac or respiratory failure as a bridging option for potential organ recovery. However, ECMO survivors often suffer from poor neurocognitive outcome due to neurological complications such as microembolic (ME) strokes. In venoarterial (va) ECMO circuits the pulmonary circulation, which usually serves as microembolic filter, may be bypassed and generated ME are prone to reach the brain in substantial amounts and potentially impair cerebral integrity. Although patient exposure to cerebral ME has been thoroughly investigated in cardiopulmonary bypass procedures, there is only limited research on cerebral ME in patients undergoing ECMO therapy. The primary study goal of this study is to determine the load and nature of cerebral ME in critically ill patients under va-ECMO support. We also aim to compare the results to measurements in healthy subjects und intensive care unit (ICU) patients without extracorporeal support to get a better impression on the relevance of ME generation during ECMO support.
The purpose of this study is to compare the changes measured by Somanetics Invos cerebral oximeter to the mean arterial pressure at brain level in patients having elective shoulder replacement surgery. The Somanetics Invos System measures and monitors the oxygen saturation (rS02) of blood in the brain tissues to help prevent brain injury or other complications. The investigators hypothesize that maintaining normocarbia and systemic mean arterial pressure at or above 70mmHg during general anesthesia in the beach chair position will decrease the number of cerebral deoxygenation events during the procedure.