A laser Doppler technique for measuring distal blood‐pressure: a comparison with conventional strain‐gauge technique

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Abstract
Summary. Twenty‐five patients with peripheral circulatory disorders were examined by laser Doppler and strain‐gauge techniques to compare these methods of measuring distal systolic blood‐pressure. The correlation coefficients for simultaneous measurement of toe and ankle systolic blood‐pressures were high, 0·98 and 0·99 respectively. The correlation coefficient for successive measurements of toe pressure was lower, 0·83, probably because of a variation in blood‐pressure with time. The laser Doppler method seems to be more sensitive than the strain‐gauge method in the low‐pressure range. The laser Doppler probe is easy to attach to most skin surfaces and the laser Doppler technique may be, therefore, an alternative and a complement to the strain‐gauge method when the strain‐gauge is difficult to use on damaged or ulcerous toes and feet.

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