Objective:

To evaluate the effectiveness of lower potassium supplementation thresholds in preventing atrial fibrillation after cardiac surgery.

Approach:

• Study Design: A randomized clinical trial (TIGHT K) conducted at 23 centers in the UK and Germany.
• Participants: 1,690 patients undergoing isolated coronary artery bypass grafting (CABG) surgery, average age 65 years, 15% female.
• Intervention: Comparison of potassium supplementation at serum concentrations below 3.6 mEq/L vs above 4.5 mEq/L.

Key Findings:

• AFACS occurred in 26.2% of the tight control group and 27.8% of the relaxed control group.
• Risk difference between groups was 1.7% (95% CI = −2.6% to 5.9%), indicating noninferiority.
• No statistically significant differences in secondary outcomes such as non-AFACS dysrhythmias, mortality, and length of stay.
• Mean per-patient savings of $111.89 in the relaxed group for potassium supplementation.

Interpretation:

Conclusion:

Sources:

• JAMA Network