The purpose of this study is to assess respiratory variation of carotid doppler peak velocity (∆CDPV) for prediction of fluid responsiveness during major abdominal surgery.
Age 18-80 years
written informed consent
scheduled major abdominal surgery
Age <18 or >80 years
pregnancy
SIRS or sepsis
any kind of cardiac arrhythmia
Only patients scheduled for major abdominal surgery with an expected high intraoperative fluid turnover will be eligble for the study. Patients with any kind of crdiac arrhythmia, valve diseases, heart failure or carotid stenosis will be excluded from the study to avoid measurement errors and bias for the hemodynamic parameters such as pulse pressure variation, stroke volume and carotid doppler peak velocity.
Cohort
Prospective
Not listed
Change in stroke volume following a fluid bolus.
A rise in stroke volume of ≥10% following a fluid bolus of 7ml/kg Ideal Body Weight is considered to reflect fluid responsiveness. Measurements will be assessed through esophageal doppler monitoring.
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