Estimation of blood pressure-related parameters by electrical impedance measurement
| Autor: | K.R. Visser, J. H. J. Muntinga |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Adult
Male medicine.medical_specialty Physiology Hemodynamics Blood Pressure Physiology (medical) Internal medicine medicine Plethysmograph Humans Aged Aged 80 and over Blood Volume business.industry Electric Conductivity Heart Venous blood Arteries Middle Aged Cardiovascular physiology Compliance (physiology) Blood pressure Regional Blood Flow Vasoconstriction Anesthesia Cuff Cardiology Arm Arterial blood Female business Compliance |
| Zdroj: | Journal of applied physiology (Bethesda, Md. : 1985). 73(5) |
| ISSN: | 8750-7587 |
| Popis: | In 13 healthy volunteers a computerized experimental set-up was used to measure the electrical impedance of the upper arm at changing cuff pressure, together with the finger arterial blood pressure in the contralateral arm. On the basis of a model for the admittance response, the arterial blood volume per centimeter length (1.4 +/- 0.3 ml/cm), the venous blood volume as a percentage of the total blood compartment (49.2 +/- 12.6%), and the total arterial compliance as a function of mean arterial transmural pressure were estimated. The effective physiological arterial compliance amounted to 2.0 +/- 1.3 microliters.mmHg-1.cm-1 and the maximum compliance to 33.4 +/- 12.0 microliters.mmHg-1.cm-1. Additionally, the extravascular fluid volume expelled by the occluding cuff (0.3 +/- 0.3 ml/cm) was estimated. These quantities are closely related to patient-dependent sources of an unreliable blood pressure measurement and vary with changes in cardiovascular function, such as those found in hypertension. Traditionally, a combination of several methods is needed to estimate them. Such methods, however, usually neglect the contribution of extravascular factors. |
| Databáze: | OpenAIRE |
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