Haemodynamic monitoring

Details Haemodynamic monitoring Haemodynamic monitoring

A - Human Necessities

61

B

A61B 5/0215 (2006.01) A61B 5/0205 (2006.01) A61B 5/029 (2006.01) A61B 5/021 (2006.01)

Patent

CA 2471279

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 x MAP) + CVP (for MAP < 58), or Va; MPAP = (a x MPAP) + CVP - (10 x INT[(MAX {MAP-109), (CVP-7),0})/10]) for MAP > 58); Vb; MPCWP = (b X MPAP) + CVP - (10 X 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 litres per square metre per minute; and K is a variable constant whose value is between 0 and 1000 depending on the values of CVP and HR.

L'invention concerne un procédé (ou un appareil), qui permet de déterminer une pression artérielle pulmonaire moyenne (MPAP), une pression capillaire pulmonaire moyenne (MPCWP) et un index cardiaque, à partir de la pression veineuse centrale (PVC), de la pression artérielle moyenne (MAP), de la fréquence cardiaque (HR) et de la température corporelle interne (T), selon les rapports suivants: MPAP = (a x MAP) + PVC (pour MAP < 58), ou Va; MPAP = (a x MPAP) + PVC - (10 x INT[(MAX {MAP-109), (PVC-7),0})/10]) pour MAP > 58); Vb; MPCWP = (b X MPAP) + PVC - (10 X INT [PVC-7/10]; et VI; CI = K (T.PVC)/ HR?2¿, VII. Dans lesdits rapports, a et b représentent environ 0,15; MAX (x, y, z) est égal au plus grand des trois éléments x, y et z; INT [x] est une partie entière de x; MAP et PVC sont mesurés en mmHg, T en celsius et HR en minutes; CI est mesuré en mètres carrés par minute; et K est une variable constante dont la valeur est comprise entre 0 et 1000 relativement à la valeur de PVC et de HR.

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