This prospective study aims to investigate the role of the passive leg raise maneuver prior to anesthesia induction in predicting post-induction hypotension among elective gastrointestinal tumor surgery patients using carotid artery Doppler parameters.
Adults aged 18 years or older
Patients scheduled for elective gastrointestinal tumor surgery
Surgery planned under general anesthesia
Body mass index (BMI) <40 kg/m²
Refusal to participate or inability to obtain written informed consent
BMI ≥40 kg/m²
Pregnancy
Emergency surgery
Adults aged 18 years or older who are scheduled for elective gastrointestinal tumor surgery under general anesthesia. Eligible participants will be ASA physical status I-III and have a BMI \<40 kg/m². Both sexes will be eligible.
Cohort
Prospective
Not listed
Predictive performance of dynamic changes in carotid Doppler parameters (ΔVTI, ΔPSV, ΔFTc) for post-induction hypotension
Evaluation of the predictive performance of percentage changes in carotid artery velocity time integral (ΔVTI), peak systolic velocity (ΔPSV), and corrected flow time (ΔFTc) after passive leg raising maneuver for post-induction hypotension
Association of baseline carotid Doppler parameters with post-induction hypotension
Evaluation of the association between baseline carotid Doppler parameters (VTI, PSV, and FTc) and the development of post-induction hypotension.
Cut-off values of changes in carotid Doppler parameters for prediction of post-induction hypotension
Determination of the optimal cut-off values of ΔVTI, ΔPSV, and ΔFTc for predicting post-induction hypotension.
Association of carotid Doppler changes with duration and severity of hypotension
Evaluation of the association between ΔVTI, ΔPSV, and ΔFTc and the duration and severity of post-induction hypotension.
Association of carotid Doppler changes with vasopressor requirement
Evaluation of the association between ΔVTI, ΔPSV, and ΔFTc and the requirement for vasopressor treatment after anesthesia induction.
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