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[Determination of reference temperatures for a cold test in digital plethysmography]
M A Pistorius1, C Briant, B Planchon
1Service de Médecine Interne, Hôtel-Dieu, Nantes.
Journal Des Maladies Vasculaires
|January 1, 1994
Summary
This study determined optimal temperatures for a cold test, finding 45°C for maximal vasodilation and 11°C for optimal vasoconstriction. These temperatures ensure reproducible and well-tolerated measurements of digital circulatory capacity.
Area of Science:
- Physiology
- Vascular Biology
Context:
- The cold pressor test is a diagnostic tool used to assess vascular reactivity.
- Standardized temperature protocols are crucial for reliable results in plethysmography.
Purpose:
- To identify optimal warm (45°C) and cold (11°C) temperatures for digital plethysmography.
- To establish reproducible and clinically tolerable temperature parameters for vascular function testing.
Summary:
- Plethysmographic signal amplitudes were measured in 36 healthy volunteers across a range of temperatures (9-47°C).
- Maximal warm amplitude occurred at 45°C, and maximal vasoconstriction at 13°C.
- The test was well-tolerated between 11°C and 45°C, with satisfactory measurement reproducibility.
Impact:
- Recommends 45°C as a non-nociceptive, reproducible reference temperature for measuring maximal digital circulatory capacities.
- Suggests adopting 11°C as the optimal vasoconstriction temperature for cold tests, enhancing diagnostic accuracy.