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Atrial natriuretic factor: response to cardiac operation.
1Division of Cardiovascular & Thoracic Surgery, Montreal General Hospital, Quebec, Canada.
The Journal of Thoracic and Cardiovascular Surgery
|August 1, 1988
Summary
Cardiopulmonary bypass causes a paradoxical increase in atrial natriuretic factor (ANF) levels, independent of atrial filling pressure. This hormone
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Cardiopulmonary bypass (CPB) is associated with physiological derangements, including complement activation, prostaglandin metabolism, and catecholamine secretion.
- These changes are hypothesized to contribute to postoperative fluid retention and hypertension.
- Atrial natriuretic factor (ANF) is a key hormone regulating vascular volume, sodium excretion, and vasomotor tone.
Purpose of the Study:
- To investigate the response of plasma atrial natriuretic factor (ANF) levels to cardiopulmonary bypass.
- To determine if CPB alters the relationship between atrial filling pressure and ANF secretion.
Main Methods:
- Serial blood sampling was performed on 23 patients undergoing cardiac surgery (18 with CPB, 5 with thoracotomy).
- Plasma ANF levels were measured before, during, and after the operation.
- Atrial filling pressure and pulmonary wedge pressure were monitored.
Main Results:
- Thoracotomy alone did not affect ANF levels.
- Patients with cardiac valve lesions exhibited elevated preoperative ANF.
- CPB induced a paradoxical rise in ANF levels, unrelated to atrial filling pressure.
- The ANF response to pulmonary wedge pressure normalized approximately 24 hours post-surgery.
Conclusions:
- Cardiopulmonary bypass significantly alters atrial natriuretic factor secretion.
- The observed paradoxical ANF response suggests a potential role in the pathophysiology of cardiac surgery.
- Further research is warranted to elucidate the specific mechanisms and clinical implications.