Spectral Analysis of Pulmonary Artery Pressure
The pulmonary artery pressure (PAP), a signal widely monitored since the advent of the Swan-Ganz flow-directed catheter,1 is the result of two independent components, the higher frequency hemodynamic component resulting from the ejection of blood from the right ventricle into the pulmonary capillary bed and the smaller amplitude, lower frequency respiratory component due to changes in intrathoracic pressure. Figure 1 demonstrates these two effects; the dominant variation is due to the heart, but mechanical ventilation superimposes a lower frequency wave. Every time a breath is delivered, the PAP changes in phase with the transpulmonary pressure.
KeywordsPulmonary Artery Pressure Pulmonary Capillary Wedge Pressure Notch Filter Intrathoracic Pressure Lower Frequency Wave
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