Haemodynamic monitoring

Details Haemodynamic monitoring Haemodynamic monitoring

2002-11-13

2008-03-04

Nasser, Robert L. (Department: 3735)

Surgery

Diagnostic testing

Cardiovascular

C600S500000

Reexamination Certificate

active

07338453

ABSTRACT:
Mean Pulmonary Arterial Pressure (MPAP), Mean Pulmonary Capillary Wedge Pressure (MPCWP) and Cardiac Index are all determinable (in a method or employing apparatus) from Central Venous Pressure (CVP), Mean Arterial Pressure (MAP), Heart Rate (HR), and Core Body Temperature (T) from the following relationships: MPAP=(a×MAP)+CVP (for MAP<58), or Va; MPAP=(a×MPAP)+CVP−(10×INT[(MAX {MAP−109), (CVP−7),0})/10]) for MAP>58); Vb; MPCWP=(b×MPAP)+CVP−(10×INT [CVP−7/10]; and VI; CI=K (T.CVP)/HR2, VII; where a and b are about 0.15; MAX (x, y, z)=largest of the three terms x, y, and z; INT [x]=integer part of x; MAP and CVP is measured in mmHg; T in Celsius and HR in counts per minute; CI is liters per square meter per minute; and K is a variable constant whose value is between 0 and 1000 depending on the values of CVP and HR.

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Warring-Davies et al., “A New Technique for Monitoring Central Venous Pressures and Determining Cardiac Index in Adults,”Technology and Health Care, 4: 233-238 (1996).
International Search Report issued Jul. 4, 2003 for corresponding PCT application No. PCT/GB02/05128.

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