title: Toe pressure determination by audiophotoplethysmography.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the performance of audiophotoplethysmography as a modality to measure toe pressure without the requirement of a recorder.
  
  
  METHODS
  A portable photoplethysmograph with an audio output was used to determine toe pressures, and the results were compared with those obtained by a commercial photoplethysmograph with a recorder.
  
  
  RESULTS
  Thirty-one measurements in control subjects and 62 measurements in patients with arterial occlusive disease were performed. The average toe pressure recorded with oscillography with standard photoplethysmography was 103.5 mm Hg +/- 14.7 SD and 95.9 mm Hg +/- 13.4 SD with audio-photoplethysmography. In the patient group the pressure recorded with a commercial photoplethysmograph was 65.3 mm Hg +/- 34.9 SD compared with 61.6 mm Hg +/- 34.8 SD obtained with audio-photoplethysmography. The difference in both groups was insignificant, and the correlation between both methods was very good.
  
  
  CONCLUSIONS
  A portable hand-held photoplethysmograph equipped with an audio output was used to measure toe pressure in control subjects and in patients with arterial occlusive disease. The results have been compared with the oscillometric method by a standard commercial photoplethysmograph connected to a recorder. The correlation was very good in the control and patient groups, and the difference between both methods was below the level of statistical significance. The fact that no recorder is needed may help in introducing toe pressure measurement into everyday office diagnostic practice.
authors.affiliation: Department of Surgery, University of California, San Diego, La Jolla 92093-0643.
authors.forename: A
authors.initials: A
authors.lastname: Fronek
authors.forename: V
authors.initials: V
authors.lastname: Blazek
authors.forename: B
authors.initials: B
authors.lastname: Curran
mesh_terms: D001157:Arterial Occlusive Diseases / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology*; D006801:Humans; D017156:Photoplethysmography / Q000295:instrumentation / Q000379:methods; D012016:Reference Values; D014034:Toes / Q000098:blood supply*