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Published on: November 26, 2018
Changes in the pulmonary capillary pressure after cardiac surgery
D K Cope1, R C Allison, M E Dumond
1Department of Anesthesiology, The University of South Alabama Medical Center, Mobile, AL, USA.
Journal of Cardiothoracic Anesthesia
|April 1, 1988
Summary
Pulmonary capillary pressure (Pc) and pulmonary artery wedge pressure (Pw) relationships differ after cardiac surgery. Mitral valve replacement patients showed increased pulmonary vascular resistance post-surgery.
Area of Science:
- Cardiovascular Physiology
- Thoracic Surgery
- Hemodynamics
Background:
- Pulmonary circulation dynamics are crucial in cardiac surgery patients.
- Understanding pressure-volume relationships aids in managing postoperative complications.
Purpose of the Study:
- To investigate changes in pulmonary circulation after Coronary Artery Bypass Grafting (CABG), Aortic Valve Replacement (AVR), and Mitral Valve Replacement (MVR).
- To assess the relationship between pulmonary capillary pressure (Pc) and pulmonary artery wedge pressure (Pw) pre- and post-surgery.
- To analyze the components of pulmonary vascular resistance (PVR) in these patient groups.
Main Methods:
- Utilized a visual technique for determining pulmonary capillary pressure (Pc).
- Calculated the Pc/Pw ratio to assess pressure independence.
- Divided total pulmonary vascular resistance (PVR) into precapillary (ra) and postcapillary (rv) components.
Main Results:
- In CABG patients, the Pc/Pw relationship remained constant despite increased cardiac output.
- AVR and MVR patients exhibited a significantly higher Pc/Pw ratio post-surgery, indicating Pw may underestimate Pc.
- MVR patients showed a significant postoperative increase in PVR and rv compared to preoperative values and other surgical groups.
Conclusions:
- The relationship between Pc and Pw varies depending on the type of cardiac surgery performed.
- Pulmonary artery wedge pressure may not accurately reflect pulmonary capillary pressure after AVR and MVR.
- Mitral valve replacement leads to a significant increase in postcapillary pulmonary vascular resistance, with the cause remaining undetermined.
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