Marino The ICU Book 4e, IE


The Pulmonary Artery Catheter

capillary hydrostatic pressure is higher than the wedge pressure, a normal wedge pressure measurement will not rule out the diagnosis of hydrostatic pul- monary edema. Therefore, the use of a normal wedge pressure as a diag- nostic criterion for ARDS should be abandoned. THERMODILUTION CARDIAC OUTPUT The ability to measure cardiac output increases the monitoring capacity of the PA catheter from 2 parameters (i.e., central venous pressure and wedge pressure) to at least 10 parameters (see Tables 8.1 and 8.2), and allows a physiologic evaluation of cardiac performance and systemic oxygen transport.



Thermistor Output


Proximal Port Injection



Injectate mixes with Blood

FIGURE 8.5 The thermodilution method of measuring cardiac output. See text for explanation.

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