Continuous, non-invasive technique for measuring blood pressure using impedance plethysmography
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United States of America Patent
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Nov 18, 2003
Grant Date -
Sep 4, 2003
app pub date -
Mar 1, 2002
filing date -
Mar 1, 2002
priority date (Note) -
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Abstract
Blood pressure is measured using the pulse transit time required for the blood volume pulse to propagate between two locations in an animal. Impedance plethysmography is employed to detect when the blood volume pulse occurs at one location. The plethysmograph may detect thoracic impedance to determine when the aortic heart valve opens or it may detect impedance at one location on a limb of the animal. Occurrence of the blood volume pulse at another location can be determined by impedance plethysmography or another technique, such as pulse oximetry. The calculation of cardiac stroke volume can be employed to compensate the derivation of the blood pressure for effects due to blood vessel compliance. A nonblood pressure monitor may periodically provide a reference blood pressure measurement that is used calibrate derivation of the blood pressure based on the pulse transit time.
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