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Adenosine effectively controls pulmonary hypertension after cardiac operations
D A Fullerton1, S D Jones, F L Grover
1Department of Surgery, University of Colorado Health Sciences Center, Denver 80262, USA.
The Annals of Thoracic Surgery
|April 1, 1996
Summary
Adenosine effectively reduced pulmonary hypertension in cardiac surgery patients by lowering pulmonary vascular resistance and mean pulmonary arterial pressure. This selective pulmonary vasodilator improved cardiac output without affecting systemic blood pressure.
Area of Science:
- Cardiology
- Anesthesiology
- Pharmacology
Background:
- Pulmonary hypertension complicates perioperative management in cardiac surgery.
- Increased pulmonary vascular resistance is a key factor.
- Adenosine shows potential as a selective pulmonary vasodilator.
Purpose of the Study:
- To evaluate the pulmonary hemodynamic effects of adenosine infusion in cardiac surgery patients with pulmonary hypertension.
- To assess adenosine's role in managing perioperative pulmonary hypertension.
Main Methods:
- Ten cardiac surgery patients with pulmonary hypertension were studied.
- General anesthesia was administered post-cardiopulmonary bypass.
- Central venous adenosine infusion (50 µg/kg/min) was administered for 15 minutes.
- Hemodynamic parameters (cardiac output, pulmonary and systemic vascular resistance, arterial pressures) were measured before, during, and after infusion.
Main Results:
- Adenosine significantly reduced mean pulmonary arterial pressure (36 to 28 mm Hg) and pulmonary vascular resistance (560 to 260 dynes·s·cm⁻⁵).
- Cardiac output increased significantly (4.0 to 6.2 L/min) during adenosine infusion.
- Systemic arterial pressure remained unchanged.
- Hemodynamic parameters returned to baseline after discontinuation of adenosine.
Conclusions:
- Adenosine is a selective pulmonary vasodilator for patients undergoing cardiac operations with pulmonary hypertension.
- It optimizes pulmonary hemodynamics without adverse systemic effects.
- Adenosine may benefit patients with right heart dysfunction by reducing right ventricular afterload.