Digital blood flow in cooled and contralateral finger in patients with Raynaud's phenomenon. Comparative measurements between photoelectrical plethysmography and laser Doppler flowmetry
| Autor: | H.W. Jentink, Jg Aarnoudse, H.E. Suichies, Jan Greve, A.A. Wouda, F.F.M. de Mul |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Male 030204 cardiovascular system & hematology Fingers 03 medical and health sciences Recovery period 0302 clinical medicine Nuclear magnetic resonance Plethysmograph Medicine Humans In patient 030212 general & internal medicine integumentary system Skin blood flow business.industry Lasers Raynaud Disease Anatomy Blood flow Laser Doppler velocimetry Middle Aged Third finger METIS-129480 Cold Temperature Plethysmography Regional Blood Flow Room air distribution Female Cardiology and Cardiovascular Medicine business Blood Flow Velocity |
| Zdroj: | Angiology, 43(2), 134-141. Sage |
| ISSN: | 0003-3197 |
| Popis: | The effects of cooling of a hand on lateral and contralateral digital skin blood flow were investigated in 18 patients with primary or secondary Raynaud's phenomenon. The aim of the study was to compare photoelectrical plethsmography (PhEP) and laser Doppler flowmetry (LDF). PhEP and LDF were used simultaneously for skin blood flow measurements of the third finger of both hands. One hand was cooled in water from 33 degrees to 3 degrees C in steps of 3 degrees C, each step lasting four minutes. It was followed by a recovery period of ten minutes in room air of 24 degrees C. During stepwise cooling from 33 degrees to 9 degrees C the relative PhEP and LDF values, measured on the cooled hand, decreased to 6.2% +/- 3.2% and 10% +/- 12% respectively. The correlation coefficients between LDF and PhEP varied between 0.79 and 0.99. In the contralateral hand the relative PhEP and LDF values decreased to 38% +/- 30.% and 64% +/- 7.9% respectively. The correlation coefficients between LDF and PhEP values were lower on the contralateral hand and ranged from 0.26 to 0.95. By calculating the LDF/PhEP ratios during cooling and recovery, more specific changes in red blood cell velocities during cooling were studied. Increasing LDF/PhEP ratios suggest increasing red blood cell velocities during cooling at 9 degrees C and a difference in the measuring methods. For testing the severity of Raynaud's phenomenon and the effect of treatment the results of both methods show consistent and quite comparable results when measured on the cooled hand. The effect of indirect cooling on the contralateral hand is, however, less consistent. |
| Databáze: | OpenAIRE |
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