title: Carotid artery corrected flow time measurement via bedside ultrasonography in monitoring volume status.
abstract: OBJECTIVE
  The purpose of this study is to investigate the possible correlation between corrected flow time (FTc) in carotid artery and changes in volume status.
  
  
  METHODS
  Ninety-three patients with end-stage renal failure who underwent fluid removal via hemodialysis were enrolled prospectively. The volume of fluid removed as well as prehemodialysis and posthemodialysis measures of FTc in the carotid artery, heart rate, and mean arterial pressure was evaluated. All imaging measurements were performed with patients at supine position, 15 minutes before and after the hemodialysis session, by evaluating the right common carotid artery at the level of the lower border of thyroid cartilage.
  
  
  RESULTS
  The mean FTc before fluid removal was 345.07±37.19 milliseconds. This measure decreased significantly after the volume removal with a posthemodialysis mean of 307.77±31.76 milliseconds (P<.0001). There was a statistically significant and negative association between the volume of fluid removed by hemodialysis and the changes in FTc (Pearson correlation, -0.39; P<.0001).
  
  
  CONCLUSIONS
  The assessment of changes in FTc of carotid artery via Doppler waveform analysis may predict the changes in intravascular volume. The use of this diagnostic modality may be an accurate and noninvasive alternative to currently available methods.
authors.affiliation: Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Hooman
authors.initials: H
authors.lastname: Hossein-Nejad
authors.affiliation: Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Payam
authors.initials: P
authors.lastname: Mohammadinejad
authors.affiliation: Nephrology Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Mahboob
authors.initials: M
authors.lastname: Lessan-Pezeshki
authors.affiliation: Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Seyedhossein Seyedhosseini
authors.initials: SS
authors.lastname: Davarani
authors.affiliation: Tehran University of Medical Sciences, Tehran, Iran. Electronic address: Shahriar_banaie@yahoo.com.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Banaie
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001783:Blood Flow Velocity; D001810:Blood Volume / Q000502:physiology; D002339:Carotid Arteries / Q000000981:diagnostic imaging*; D015150:Echocardiography, Doppler; D005260:Female; D006339:Heart Rate; D006801:Humans; D007676:Kidney Failure, Chronic / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D006435:Renal Dialysis; D055815:Young Adult
keywords: Carotid artery; Doppler; Emergency medicine; Kidney failure; Renal dialysis; Ultrasonography; chronic; common