title: [Doppler ultrasound determination of vascular resistance in arteriovenous shunts of the finger tip].
abstract: OBJECTIVE
  Doppler sonographic assessment of physiological bloodflow characteristic in arteriovenous shunts of the fingertip and calculation of vascular resistance. Identification and definition of a peripheral, physiological resistive index in healthy volunteers.
  
  
  METHODS
  Doppler sonographic measurement of bloodflow values in Hoyer-Grosser organs of the fingertip in 20 healthy volunteers. Measurements were repeated at normal air temperature (21 degrees C) and after submersion in water (15 degrees C). The resistive index was calculated from peak systolic velocity and minimal diastolic velocity.
  
  
  RESULTS
  Although bloodflow values vary in a wide range, the resistive index is constant with 0.54 (range 0.45-0.69) in healthy volunteers. Characteristic sonographic flow patterns could be achieved in all tests.
  
  
  CONCLUSIONS
  Colour Doppler sonography allows identification of small arterio-venous shunts of the fingertip, measurement of bloodflow in these vessels and calculation of vascular resistance. At normal air temperature the physiological resistive index is 0.54.
authors.affiliation: Univ.-Klinik für Radiodiagnostik I, Leopold-Franzens-Universität Innsbruck.
authors.forename: S
authors.initials: S
authors.lastname: Voelckel
authors.forename: G
authors.initials: G
authors.lastname: Bodner
authors.forename: W
authors.initials: W
authors.lastname: Voelckel
authors.forename: C
authors.initials: C
authors.lastname: Stadlwieser
authors.forename: P
authors.initials: P
authors.lastname: De Koekkoek
authors.forename: P
authors.initials: P
authors.lastname: Springer
mesh_terms: D000328:Adult; D000368:Aged; D001163:Arteriovenous Anastomosis / Q000000981:diagnostic imaging*; D001783:Blood Flow Velocity / Q000502:physiology; D005260:Female; D005385:Fingers / Q000098:blood supply*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D018608:Ultrasonography, Doppler; D014655:Vascular Resistance / Q000502:physiology*
vernacular_title: Dopplersonographische Bestimmung des Gefässwiderstandes in arteriovenösen Shunts der Fingerbeere.