Serum Potassium Levels and Short-Term Outcomes in Patients With ST-Segment Elevation Myocardial Infarction

Area of Science:

• Cardiology
• Internal Medicine
• Clinical Research

Background:

• Current guidelines recommend serum potassium levels of 4.0-5.0 mEq/L for acute myocardial infarction (AMI) patients.
• These recommendations predate the widespread use of beta-blockers and reperfusion therapies.
• Optimal potassium levels in the current therapeutic era require re-evaluation.

Purpose of the Study:

• To determine the association between serum potassium levels and clinical outcomes in patients with ST-segment elevation myocardial infarction (STEMI).
• To identify the optimal serum potassium range for minimizing adverse events in STEMI patients.

Main Methods:

• Retrospective analysis of 6613 STEMI patients without renal insufficiency.
• Patients categorized into five serum potassium groups: <3.5, 3.5–<4.0, 4.0–<4.5, 4.5–<5.0, and ≥5.0 mEq/L.
• Multivariate regression analysis used to assess mortality risk.

Main Results:

• The lowest rates of malignant arrhythmia and mortality were observed in patients with potassium levels of 4.0–<4.5 mEq/L.
• Compared to the 4.0–<4.5 mEq/L group, 30-day mortality risk was significantly higher for potassium levels of 4.5–<5.0 mEq/L (HR: 1.52) and ≥5.0 mEq/L (HR: 1.80).
• Serum potassium levels >4.5 mEq/L were associated with a significant increase in 30-day mortality risk.

Conclusions:

• The optimal serum potassium range for STEMI patients appears to be 4.0–4.5 mEq/L.
• Maintaining serum potassium levels above 4.5 mEq/L in STEMI patients is associated with increased mortality.
• Current guidelines may need revision based on contemporary treatment strategies.