The effect of hematocrit on photoelectric plethysmogram.
In order to study the effect of hematocrit (Ht) on the photoelectric plethysmograms of fingers and toes, an experimental model study and a clinical study were carried out. Experimentally, it was found that the height of the plethysmograms increased when the values of Ht were lowered. In the clinical study, 3 groups of patients with different HT values ranging from 27 to 55% were examined. A reverse relationship was found between the Ht value and pulse height of the plethysmogram. The physical effects of the blood flow and contents upon the plethysmograms were discussed.
D000328:Adult; D005260:Female; D005385:Fingers / Q000098:blood supply; D006400:Hematocrit; D006801:Humans; D008297:Male; D008954:Models, Biological; D010991:Plethysmography; D011674:Pulse; D013997:Time Factors; D014034:Toes / Q000098:blood supply