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Serum potassium > 7.0  mEq/L is associated with conduction abnormalities and bradycardia: Prolonged QRS interval with bizarre QRS morphology High-grade AV block with slow junctional and ventricular escape rhythms Any kind of conduction block (bundle branch blocks, fascicular blocks) Sinus bradycardia or slow AF Development of a sine wave appearance (a pre-terminal rhythm) From Life in the Fast Lane https://lifeinthefastlane.com/ecg-library/basics/hyperkalaemia/

1. Hyperkalemia 5.9 mEq/L The T waves are peaked.   They have a broad base with a narrow apex. 2. Hyperkalemia 6.1 mEq/L  The P wave is absent.   The QRS complex remains narrow but there is a tall T wave present. 3. Hyperkalemia 6.2 mEq/L  The P wave is absent.   The QRS complex is wide and there is a tall T wave present. 4. Hyperkalemia 6.4 mEq/L 5. Hyperkalemia 6.8 mEq/L 6. Hyperkalemia 6.9 mEq/L  The PR interval is .26 sec.   The QRS complex is .10 sec.   The T waves are tall. 7. Hyperkalemia 6.9 mEq/L The P wave is absent.   The QRS complex is wide with a very peaked T wave. 8. Hyperkalemia 7.0 mEq/L 9. Hyperkalemia 7.1 mEq/L 10. Hyperkalemia 7.1 mEq/L 11. Hyperkalemia 7.9 mEq/L 12. Hyperkalemia 8.0 mEq/L The rhythm is dual paced. The QRS complex is normally wide in a ventricul...

1. Hyperkalemia 2. Hyperkalemia 5.5mEq/L 3. Hyperkalemia 6.0mEq/L 4. Hyperkalemia 6.4mEq/L 5. Hyperkalemia 7.1mEq/L 6. Hyperkalemia 7.0mEq/L Hyperkalemia ECG changes ·          Flattened or absent P waves ·          Prolonged PR interval ·          Widened QRS complex ·          Peaked (widened base, narrow peaks) or elevated T waves ·          ST depression Table 2 —ECG findings in hyperkalemia 1 Severity               Findings Mild to moderate Peaked, “tented” T waves Flattening of P waves Moderate* Loss of P waves Increased PR interval Uniform widening of QRS complex  Nodal rhythm Severe ...

EKG strips showing "tall T waves" which are often  characteristic of hyperkalemia. 1. Hyperkalemia 6.2 mEq/L 2. Hyperkalemia 6.8 mEq/L 3. Hyperkalemia 7.6 mEq/L 4. Normal Potassium 3.8 mEq/L  This is lead V3.  This patient also had left ventricular hypertrophy.   Compare this to the previous EKG strip shown above which also is taken from a V3 lead. 5. Hyperkalemia 6.8 mEq/L

Hyperkalemia 7.7mEq/L ·          Prolonged PR interval ·          Widened QRS complex ·          Peaked (widened base, narrow peaks) or elevated T waves After treating hyperkalemia 7.7mEq/L ·          Widened QRS complex resolved ·          Peaked (widened base, narrow peaks) or elevated T waves resolved Hyperkalemia 8.8 mEq/L ·          Flattened or absent P waves ·          Prolonged PR interval ·          Widened QRS complex ·          Peaked (widened base, narrow peaks) or elevated T waves ·          ST depression Reviewed 3/1/16

Hyperkalemia 5.9mEq/L    Peaked (widened base, narrow peaks) or elevated T waves Hyperkalemia 6.4mEq/L ·          Flattened or absent P waves ·          Widened QRS complex ·          ST depression ECG after treating hyperkalemia 6.4mEq/L   ·          Flattened or absent P waves resolved ·          Widened QRS complex resolved ·          ST depression improved Hyperkalemia 6.6mEq/L ·          Flattened or absent P waves ·          Prolonged PR interval ·          Widened QRS complex ·          Peaked (widened ...

Hyperkalemia ECG changes ·          Flattened or absent P waves ·          Prolonged PR interval ·          Widened QRS complex ·          Peaked (widened base, narrow peaks) or elevated T waves ·          ST depression   Table 2 —ECG findings in hyperkalemia 1 Severity                               Findings Mild to moderate                     Peaked, “tented” T waves                     Flattening of P waves Moderate*                ...