title: Nonpulsatile arterial waveforms: observations during graded testicular torsion in rats.
abstract: OBJECTIVE
  We tested whether testicular torsion could completely damp distal arterial pulsatility, resulting in venous-appearing arterial waveforms.
  
  
  METHODS
  Progressively increasing testicular torsion was unilaterally produced in five rats. Doppler waveforms of the testicular artery distal to the torsion were obtained as soon as possible after each level of torsion until a complete absence of pulsatility was noted.
  
  
  RESULTS
  One animal was not studied further after the first 180 degrees of torsion occluded flow. In three of the remaining four animals, the testicular artery resistive index (RI) at baseline (0.51, 0.58, 0.64) was within the range of the normal human intratesticular RI and decreased with increasing torsion, culminating in nonpulsatile, venous-appearing waveforms at high degrees of torsion.
  
  
  CONCLUSIONS
  Testicular torsion can completely damp arterial pulsatility, resulting in nonpulsatile, venous-appearing arterial Doppler waveforms.
authors.affiliation: Department of Radiology, University of Michigan Medical School, Ann Arbor, USA.
authors.forename: R O
authors.initials: RO
authors.lastname: Bude
authors.forename: M J
authors.initials: MJ
authors.lastname: Kennelly
authors.forename: R S
authors.initials: RS
authors.lastname: Adler
authors.forename: J M
authors.initials: JM
authors.lastname: Rubin
mesh_terms: D000818:Animals; D001158:Arteries / Q000503:physiopathology*; D008297:Male; D011673:Pulsatile Flow; D051381:Rats; D017207:Rats, Sprague-Dawley; D013086:Spermatic Cord Torsion / Q000000981:diagnostic imaging*; D013737:Testis / Q000098:blood supply*; D014463:Ultrasonography