Apparatus for determining cardiovascular parameters

Details Apparatus for determining cardiovascular parameters Apparatus for determining cardiovascular parameters

2008-01-01

2008-01-01

Marmor, II, Charles A. (Department: 3735)

Surgery

Diagnostic testing

Cardiovascular

C600S485000, C600S508000

Reexamination Certificate

active

10743515

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 formulain-line-formulae description="In-line Formulae" end="lead"?Ptransmural=Pao−f(C)*PITin-line-formulae description="In-line Formulae" end="tail"?The cardiac volume responsiveness indicator (CVRI) is calculated for mechanical positive respiration according to the formulain-line-formulae description="In-line Formulae" end="lead"?CVRI=k*(SVV/ΔCVP)in-line-formulae description="In-line Formulae" end="tail"?or for spontaneous breathing according to the formulain-line-formulae description="In-line Formulae" end="lead"?CVRI=l−m*(ΔCVP/SVV).in-line-formulae description="In-line Formulae" end="tail"?

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PergamonComputers in Biology and Medicinevol. 32 (2002), pp. 363-377 title: “Simulation of cardiovascular physiology: the diastolic function(s) of the heart” by T. Podnar, F. Runovc and M. Kordas.
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