ZyraDoc #06 - August 08, 2026

A 62-year-old man with end-stage renal disease presents with severe muscle weakness after missing two hemodialysis sessions.

Emergency laboratory results reveal severe hyperkalemia, specifically a serum potassium level of 7.4 mEq/L.

A 12-lead ECG indicates a high risk of ventricular arrhythmias and cardiac arrest, specifically demonstrated by tall, narrow-based peaked T waves, PR interval prolongation, and QRS complex widening.

Case Summary

Clinical Focus:

A 62-year-old male with end-stage renal disease presents with severe, life-threatening hyperkalemia (potassium 7.4 mEq/L) accompanied by characteristic cardiac conduction abnormalities on 12-lead ECG.

ECG criteria for Severe Hyperkalemia include:

Tall, narrow-based, peaked T waves (earliest finding)
PR interval prolongation and flattening or loss of P waves
QRS complex widening (progressing to sine-wave pattern and impending cardiac arrest)

When severe hyperkalemia is accompanied by ECG changes or signs of cardiac toxicity, immediate membrane stabilization is the essential first step before attempting to shift or eliminate potassium.

Here is the Management Strategy:

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