The usefulness of a laser Doppler in the measurement of toe blood pressures.

Abstract:

OBJECTIVE:The purpose of this study was to evaluate the clinical value and reproducibility of laser Doppler (LD) versus photoplethysmography (PPG) in the measurement of the systolic toe blood pressure. METHODS:Toe blood pressure was measured in 60 patients in different stages of peripheral vascular disease with simultaneous digital sampling of PPG and two LD signals, each with a different filter setting (3 second [LD(3)] and 0.03 second [LD(0.03)]), and cuff pressure. These measurements were repeated after 1 week. The signals were analyzed with previous results ignored. The agreement of the PPG and LD pressures and reproducibility after 1 week were assessed by calculating the intraclass correlation coefficient (ICC). The agreement variation across the range of pressure values was visually explored by means of difference plots. RESULTS:In 19 legs with a very low pressure only LD could adequately measure the pressure, whereas PPG did not. The ICCs between PPG and LD(3) and LD(0.03) were 0.95 or more. The ICCs of the 1-week reproducibility of the PPG, LD(3), and LD(0.03) pressures were 0.92, 0.88, and 0.86, respectively. The variation was equally distributed across the range of pressures in all three methods. CONCLUSION:LD is a reliable alternative to PPG to measure toe blood pressures. Furthermore, LD is able to measure low pressures, which is relevant in the assessment of the presence of critical ischemia.

journal_name

J Vasc Surg

authors

de Graaff JC,Ubbink DT,Legemate DA,de Haan RJ,Jacobs MJ

doi

10.1067/mva.2000.108009

subject

Has Abstract

pub_date

2000-12-01 00:00:00

pages

1172-9

issue

6

eissn

0741-5214

issn

1097-6809

pii

S0741-5214(00)04606-1

journal_volume

32

pub_type

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