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Comparison of the hemodynamic changes following left atrial and peripheral venous administration of protamine during
Insights
Administering protamine sulfate for heparin reversal via the left atrium offers no hemodynamic advantages over the peripheral venous route in cardiac surgery patients. Hemodynamic parameters remained comparable between the two administration methods.
Area of Science:
- Cardiology
- Cardiac Surgery
- Pharmacology
Background:
- Heparin is commonly used during cardiopulmonary bypass (CPB).
- Protamine sulfate is the standard agent for heparin reversal post-CPB.
- The route of protamine administration may influence hemodynamic stability.
Purpose of the Study:
- To compare the hemodynamic effects of left atrial versus peripheral venous administration of protamine sulfate for heparin reversal.
- To evaluate potential advantages of left atrial protamine administration in cardiac surgery patients.
Main Methods:
- A randomized controlled trial involving 100 patients undergoing cardiac surgery with CPB.
- Patients were divided into two groups: left atrial protamine administration (Group I) and peripheral venous protamine administration (Group II).
- Hemodynamic parameters (heart rate, arterial blood pressure, central venous pressure) were measured pre- and post-protamine administration.
Main Results:
- No statistically significant differences in heart rate, arterial blood pressure, or central venous pressure were observed between the left atrial and peripheral venous protamine administration groups.
- Arterial blood pressure showed a transient non-significant change before returning to baseline values in both groups.
- Left atrial protamine administration did not demonstrate superior hemodynamic effects compared to peripheral venous administration.
Conclusions:
- Left atrial administration of protamine sulfate for heparin reversal does not offer significant hemodynamic advantages over the peripheral venous route in patients undergoing cardiac surgery with CPB.
- The findings suggest that the route of administration is unlikely to be a critical factor in hemodynamic management post-CPB when other parameters are optimized.
Abstract:
The hemodynamic effects of left atrial administration of protamine for heparin reversal were compared with the peripheral venous route. One hundred patients, undergoing cardiac surgery, using cardiopulmonary bypass (CPB) at Siriraj hospital were randomly allocated into two equal groups of fifty. The preoperative and operative characteristics of the two groups were comparable. After the termination of CPB, protamine sulfate was administered over 3 minutes via the left atrium in group I, and via the peripheral vein in group II. The hemodynamics were measured before and 5, 15 and 30 minutes after protamine administration. There were no statistically significant differences in heart rate (HR), arterial blood pressure (BP), and central venous pressure (CVP) between the groups. After administrating protamine and adequate maintaining the preload in both groups of patients within the normal range, the HR did not change from immediate post CBP control values. The arterial BP was not changed for 5 minutes, thereafter, significantly elevated toward the preoperative baseline values. This data indicates that the left atrial injection of protamine does not provide any hemodynamic advantages over the peripheral venous administration.