The Value of Preoperative Carotid Doppler Ultrasonography Parameters in Predicting Post-Induction Hypotension in Patients Undergoing Elective Non-Cardiac Surgery

Post-induction hypotension (PIH) is a common hemodynamic complication during the induction of general anesthesia and is associated with increased risk of perioperative morbidity and mortality. Identifying patients at risk of developing hypotension before anesthesia induction may allow anesthesiologists to implement preventive strategies and optimize perioperative hemodynamic management.

Traditional static hemodynamic parameters are often insufficient to accurately assess intravascular volume status and cardiovascular reserve. Doppler ultrasound-based measurements have emerged as useful non-invasive tools for evaluating cardiovascular dynamics. Carotid Doppler ultrasonography, in particular, allows rapid bedside assessment of hemodynamic parameters such as carotid velocity-time integral (carotid VTI) and corrected carotid flow time (ccFT), which may reflect changes in stroke volume and preload responsiveness.

This prospective observational study aims to evaluate the ability of preoperative carotid Doppler parameters, including carotid VTI and corrected carotid flow time (ccFT), to predict the development of post-induction hypotension in adult patients undergoing elective non-cardiac surgery under general anesthesia. Carotid Doppler measurements will be performed during the preoperative period, and anesthetic induction will be conducted in accordance with the study protocol under standard monitoring conditions. Hemodynamic parameters will be recorded during the induction period, and the occurrence of post-induction hypotension will be documented.

The primary objective of this study is to determine the predictive performance of carotid VTI and corrected carotid flow time for post-induction hypotension. Secondary analyses will explore the relationship between Doppler-derived hemodynamic parameters and perioperative hemodynamic changes. The findings of this study may contribute to improving perioperative risk stratification and guiding individualized hemodynamic management strategies.