# Value of carotid corrected flow time or changes value of FTc could be more useful in predicting fluid responsiveness in patients undergoing robot-assisted gynecologic surgery: a prospective observational study

## TL;DR

This study shows that carotid corrected flow time is a better predictor of fluid responsiveness than its changes during surgery.

## Contribution

The study introduces carotid corrected flow time as a more reliable predictor of fluid responsiveness in gynecologic surgery patients.

## Key findings

- Carotid corrected flow time had an AUC of 0.82 for predicting fluid responsiveness.
- Changes in carotid corrected flow time had an AUC of 0.67.
- The optimal cut-off for carotid corrected flow time was 357 ms.

## Abstract

The aim of this study was to evaluate the ability of point-of-care Doppler ultrasound measurements of carotid corrected flow time and its changes induced by volume expansion to predict fluid responsiveness in patients undergoing robot-assisted gynecological surgery.

In this prospective study, carotid corrected flow time was measured using Doppler images of the common carotid artery before and after volume expansion. The stroke volume index at each time point was recorded using noninvasive cardiac output monitoring with MostCare. Of the 52 patients enrolled, 26 responded.

The areas under the receiver operating characteristic curves of the carotid corrected flow time and changes in carotid corrected flow time induced by volume expansion were 0.82 and 0.67, respectively. Their optimal cut-off values were 357 and 19.5 ms, respectively.

Carotid corrected flow time was superior to changes in carotid corrected flow time induced by volume expansion for predicting fluid responsiveness in this population.