ISSN:
1741-0444
Keywords:
Arterial elastic properties
;
Electric impedance
;
Noninvasive measurement
;
Plethysmograph
;
Sphygmomanometry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
Notes:
Abstract A new plethysmograph, the electric impedance cuff, was designed for the indirect measurement of blood pressure, volume elastic modulus Ev and compliance Ca in human limb arteries. This comprises a compression chamber filled with electrolyte solution and a tetrapolar electric impedance plethysmograph whose electrodes are placed inside the chamber; the former for controlling transmural arterial pressure Pt, and the latter for detecting total limb volume Vo, mean arterial volume $$\bar V_a $$ and its variation ΔVa. Systolic and mean arterial pressure in the upper arms, forearms and fingers were measured by detecting pulsatile impedance variation during the gradual (3–5 mm Hg per heart beat) increase (or decrease) in chamber pressure by the volume oscillometric technique. Diastolic and pulse pressure ΔP were calculated from these pressure values. Compliance Ca=ΔV/ΔP and volume elastic modulus $$E_v = \Delta P/(\Delta V_a /\bar V_a )$$ were recorded at various Pt levels, controlled by the compression pressure. Although this is a kind of impedance plethysmograph, the volume change in a limb segment can be detected by this method without passing electric current through the limb.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02441465
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