The diagnostic utility of sonographic carotid flow time in determining volume responsiveness☆,☆☆

    loading  Checking for direct PDF access through Ovid



We aimed to predict volume responsiveness and to assess the diagnostic accuracy of carotid flow time (FTc) with the change in hydration status before and after a passive leg raise (PLR) maneuver.


Participants who presented at a community health fair in a dehydrated state following a prolonged fast while observing the month of Ramadan were recruited. Sonographic FTc measurements were obtained in the semi-Fowler position and after a PLR maneuver while participants were in a fasting state and repeated approximately 3 hours after breaking their fast.


In total, 123 participants with mean age of 47 ± 14 years, 55% male, were enrolled. Participants had fasted for an average of 16.9 hours and consumed an average of 933 mL between the 2 ultrasound measurements. Mean FTc values were significantly lower in the fasting state compared with the nonfasting state (312 ± 22 vs 345 ± 25 milliseconds, P value < .001). Relative increases in FTc following a PLR maneuver demonstrated strong discrimination of volume status (area under the receiver operating curve: 0.86 [95% confidence interval, 0.81-0.91]).


The use of point-of-care ultrasound to measure FTc may provide a noninvasive alternative to determine fluid status. Percentage change in FTc of ≥5% provides a reliable diagnostic accuracy for predicting fluid status.

Related Topics

    loading  Loading Related Articles