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Antidiuretic hormone levels during cardiopulmonary bypass
The Journal of Thoracic and Cardiovascular Surgery
|January 1, 1977
Summary
Cardiopulmonary bypass (CPB) significantly increases antidiuretic hormone (ADH) levels, leading to increased urine flow and decreased urine osmolality. These hormonal changes during CPB appear to be a stress response, not directly regulating water balance.
Area of Science:
- Nephrology
- Cardiovascular Surgery
- Endocrinology
Background:
- Cardiopulmonary bypass (CPB) is a complex procedure with potential effects on fluid and electrolyte balance.
- Antidiuretic hormone (ADH), also known as vasopressin, plays a crucial role in regulating water excretion.
Purpose of the Study:
- To investigate the impact of CPB on plasma ADH levels, urine flow, and urine osmolality.
- To understand the physiological response to the stress of CPB.
Main Methods:
- Nine patients undergoing CPB were studied.
- Measurements of ADH, urine flow, and osmolality were taken before, during, and after CPB.
- Standard anesthesia with morphine and nitrous oxide/oxygen was used.
Main Results:
- Urine flow increased significantly during CPB (P < 0.02).
- Urine osmolality decreased significantly during CPB (P < 0.05).
- Plasma ADH levels rose significantly with surgical stimulation and peaked during CPB (P < 0.01).
Conclusions:
- CPB induces a significant increase in ADH levels, likely as a stress response.
- Elevated ADH concentrations during CPB exceed physiological needs for water balance.
- Hemodynamic changes during CPB appear to have a greater influence on urine flow than ADH levels.