April 1971
Volume 10, Issue 4
Free
Articles  |   April 1971
Photoelectric Plethysmography
Author Affiliations
  • ROBERT E. CHRISTENSEN
    Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, Calif.
  • IRVING POSALSKI
    Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, Calif.
  • RICHARD WONG
    Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, Calif.
  • HAROLD WEISMAN
    Jules Stein Eye Institute, UCLA School of Medicine, Los Angeles, Calif.
Investigative Ophthalmology & Visual Science April 1971, Vol.10, 247-251. doi:
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      ROBERT E. CHRISTENSEN, IRVING POSALSKI, RICHARD WONG, HAROLD WEISMAN; Photoelectric Plethysmography . Invest. Ophthalmol. Vis. Sci. 1971;10(4):247-251.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Ocular blood flow in dogs was monitored with the use of a specially designed photoelectric plethysmograph transducer. The ocular pulse waves demonstrated were (1) of low amplitude, (2) coincident with cardiac systole, and (3) rapidly affected by stimuli known to influence cerebral blood flow. Changes in ocular pulse amplitude correlated with concurrent blood gas analyses (arterial pCO2 and pO2). Hypercarbia and hypoxia increase the ocular pulse amplitude, while hypocarbia and hyperoxia decrease the ocular pulse amplitude. Variations in ocular pulse amplitude measured by photoelectric plethysmography may mirror changes in cerebral and ocular blood flow.

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