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KMID : 0357019960120020224
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Journal of the Korean Vascular Surgery Society
1996 Volume.12 No. 2 p.224 ~ p.229
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Hemodynamics of Limbs in Response to Externally Applied Cuff Pressure: Evaluation Using Photoplethysmography
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Abstract
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Objective:
@EN To evaluate hemodynamics in a model of peripheral arterial obstruction simulated by external compression of limbs with pressure cuff.
@ES Background:
@EN Clinical symptoms are not accurate for indicating the severity of arterial obstructive disease. Noninvasive vascular diagnostic methods which consists of plethysmography(PG) and Doppler equipments are now commonly available. PG is used to
evaluate
the volume status of the limb under study and Doppler is used for assessment of flow or flow velocity in the specific vessel under evaluation. PG measures volume change of the limb. Given that change of volume per unit time equals flow, we can
obtain
flow value from PG data.
@ES Methods:
@EN To develop a model to evaluate the relationship of pressure, flow and resistance in peripheral arteial obstruction, we used application of graded external prespressure cuff was applied just above the ankle of 40 lower limbs of healthy
volunteers sat
comfortably in a chair with the leg in horizontal position. The a.c.signal was acquired for successive 20 seconds for each 20 mmHg increment of cuffpressure until 140 mmHg. The analog data were digitized at 200 Hz and stored on disks via a
PC-based
acquisition system(Biopac systems, Inc.(r)) The PPG waves were filtered through high pass filter(>0.5Hz) and differentiated to get thw flow data.
@ES Result:
@EN The flow was significantly impaired from 80 mmHg or above of cuff inflation with concomitant increase of resistance and pressure gradient across the cuff.
@ES Conclusion:
@ENPPG was useful in evaluation of peripheral arterial hemodynamics which showed significant changes at 80 mmHg and above of cuff inflation pressure.
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KEYWORD
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