| 摘要 |
<p>A catheter set (10) is used in connection with a blood flow monitor and calibration system (80) to determine the compliance C of a vessel according to the equation C = dV2 / (PE - PA), where dV2 is the change in volume of the vessel created by the change in volume (e.g., deflation) of a displacement balloon (30) adjacent to a catheter (14), PE is an estimate of what the pressure measured by a pressure transducer (56) or a strain gage (78) would have been but for the change in volume of the displacement balloon at a particular time, and PA is the actual pressure measured by the transducer at the particular time. The determined compliance C is more accurate than that obtained through thermal dilution procedures. The determined value of compliance C may then be used in calculation of blood flow. In addition, pulmonary vascular resistance and systemic vascular resistance may be calculated through procedures and in equations using the determined compliance without directly measuring the pulmonary capillary wedge pressure.</p> |
