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).
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
30
Usage of transpharyngeal Doppler to assess cerebral perfusion during cardiovascular surgery
Usage of conventional colour-coded Duplex sonography (CDS) to assess cerebral perfusion during cardiovascular surgery
Inselspital, University Hospital Bern, University of Bern
Bern, Switzerland
Accuracy of cerebral flow velocity measurement
Cerebral blood flow velocity measurements will be performed with transpharyngeal Doppler sonography (TPS) and conventional colour-coded Duplex sonography (CDS). Doppler flow velocities (obtained at the same intraoperative phase and at the same time) will be compared between TPS and CDS TPS and different Doppler techniques.
Time frame: intraoperative phase, expected to be ca. 4 hours
Hypothermic Circulatory Arrest
Doppler flow velocities (obtained with both methods in the Phase of hypothermic circulatory arrest - intraoperatively) will be compared between TPS and CDS TPS and different Doppler techniques.
Time frame: intraoperative phase, expected to be ca. 4 hours
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