Apparatus for determining cardiovascular parameters
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United States of America Patent
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Jan 1, 2008
Grant Date -
Dec 9, 2004
app pub date -
Dec 22, 2003
filing date -
Dec 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus that continuously monitors the arterial pressure measured by a pressure sensor in an artery, which pressure is regarded as the reading Pao that approximately corresponds to the aortal pressure. In principle, the arterial pressure can be measured in the aorta, near the aorta, or in the arterial tree. To provide a second reading, the apparatus, via the input channel, continuously monitors the central venous pressure (CVP), which is regarded as the reading PIT that approximately corresponds to the intrathoracic pressure (ITP). The third reading is provided via the input channel as a reading Z which expresses the thoracic compliance. Via known algorithms of the pulse contour analysis, the apparatus calculates the stroke volume variation, using as the determining pressure the transmural pressure which is calculated according to the formula Ptransmural=Pao-f(C)*PIT The cardiac volume responsiveness indicator (CVRI) is calculated for mechanical positive respiration according to the formula CVRI=k*(SVV/.DELTA.CVP) or for spontaneous breathing according to the formula CVRI=l-m*(.DELTA.CVP/SVV).
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