title: Evaluation of portal vascular resistance using an intraoperative Doppler ultrasound.
abstract: OBJECTIVE
  To evaluate portal vascular resistance using Doppler ultrasound intraoperatively.
  
  
  METHODS
  We measured maximum flow velocities and pressures of umbilical portion of the left portal branch before and after clamping of the right main branch of the Glisson's sheath. We proposed a new index, simplified portal resistive index, that was the ratio of the difference of the portal venous pressure to the difference of maximum portal flow velocity.
  
  
  RESULTS
  There were good correlations between portal vascular resistance and simplified portal resistive index. Simplified portal resistive index was found to become higher as fibrotic changes progressed, and there were significant differences between normal liver, chronic hepatitis, and liver cirrhosis.
  
  
  CONCLUSIONS
  Simplified portal resistive index evaluated using intraoperative Doppler ultrasound is an easy and reliable index for assessing portal vascular resistance during liver surgery.
authors: Department of Surgery, Otemae Hospital, 1-5-34 Otemae, Chuo-ku, Osaka 540-0008, Japan.
authors: Toshikazu
authors: T
authors: Ito
authors: Yasuo
authors: Y
authors: Matsuda
authors: Yoshiro
authors: Y
authors: Oguchi
authors: Toshinori
authors: T
authors: Ito
authors: Hikaru
authors: H
authors: Matsuda
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity; D006528:Carcinoma, Hepatocellular / Q000503:physiopathology / Q000601:surgery; D005260:Female; D006498:Hepatectomy; D006521:Hepatitis, Chronic / Q000503:physiopathology; D006801:Humans; D008103:Liver Cirrhosis / Q000503:physiopathology; D008113:Liver Neoplasms / Q000503:physiopathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D011168:Portal System / Q000502:physiology*; D013815:Thermodilution; D018608:Ultrasonography, Doppler; D014655:Vascular Resistance