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Arrhythmias following cardiac surgery: relation to serum digoxin levels
Insights
Postoperative arrhythmias are common after cardiac surgery, especially valve surgery. Many arrhythmias may be due to increased sensitivity to digitalis glycosides rather than toxicity.
Area of Science:
- Cardiology
- Cardiac Surgery
- Electrophysiology
Background:
- Postoperative arrhythmias are a frequent complication following cardiac surgery.
- Identifying the etiology of these arrhythmias is crucial for effective management.
Purpose of the Study:
- To analyze the incidence and characteristics of arrhythmias in patients undergoing cardiac surgery.
- To evaluate the potential roles of electrolyte abnormalities, pericarditis, serum osmolarity, digoxin levels, and surgical type in the development of postoperative arrhythmias.
Main Methods:
- Retrospective analysis of 50 patients undergoing various cardiac surgical procedures.
- Evaluation of postoperative arrhythmias, electrolyte levels, serum osmolarity, and digoxin levels.
- Correlation of these factors with the occurrence of arrhythmias.
Main Results:
- 74% of patients developed postoperative arrhythmias, with valve surgery patients having a significantly higher incidence (p < 0.001).
- Atrial fibrillation was the most common arrhythmia.
- Hypocalcemia, hypomagnesemia, pericarditis, and osmolarity shifts did not correlate with arrhythmias.
- 17 patients had arrhythmias suggestive of digitalis toxicity, despite a wide range of digoxin levels, suggesting increased sensitivity or surgical trauma effects.
Conclusions:
- Postoperative arrhythmias are highly prevalent, particularly after valve surgery.
- The distinction between digitalis-induced and spontaneous arrhythmias is often unclear.
- Therapeutic strategies should consider the potential for digitalis sensitivity in the postoperative cardiac surgery setting.
Abstract:
Arrhythmias were analyzed in 50 patients undergoing cardiac surgery: 27 with valve surgery, 15 with coronary artery bypass (CAB), 5 with CAB and valve surgery, and 3 with miscellaneous procedures. The role of electrolyte abnormalities, pericarditis, serum osmolarity, digoxin level, and the type of surgery performed was evaluated. Thirty-seven out of 50 patients (74 per cent) had a postoperative arrhythmia, and a total of 78 different arrhythmias were noted. Twenty-six out of 27 patients with valve surgery had an arrhythmia vs. six out of 15 patients with CAB (p less than 0.001). Atrial fibrillation was the most common arrhythmia in all groups. Although postoperative hypocalcemia, hypomagnesemia, pericarditis, and wide shifts in osmolarity were common, they did not correlate with arrhythmias. Seventeen patients developed postoperative arrhythmias compatible with digitalis toxicity, including junctional rhythm, atrioventricular dissociation, or atrial tachycardia with block. However, the range of serum digoxin levels in these patients was zero to 2.80 ng. per milliliter. This suggests increased sensitivity to digitalis glycosides or the effects of surgical trauma as the etiology of arrhythmia in many patients. The distinction between digitalis-induced arrhythmia and spontaneously occurring arrhythmia cannot be made with certainty in most postoperative patients. Therapy should reflect an awareness of the potential for postoperative digitoxicity.