Comparison of quantifiable electrocardiographic changes associated with severe hyperkalemia

Area of Science:

• Cardiology
• Medical Diagnostics

Background:

• Hyperkalemia (HK) is a critical condition often assessed using electrocardiograms (ECGs).
• ECG characteristics in severe HK (≥ 6.3 mEq/L) require further elucidation.

Purpose of the Study:

• To compare and correlate ECG metrics in severe HK with baseline normokalemic ECGs and serum potassium levels.
• To identify specific ECG parameters that are indicative of severe hyperkalemia.

Main Methods:

• Retrospective analysis of 340 severe HK encounters.
• Comparison of ECG metrics between severe HK and normokalemic states.
• Correlation of ECG metrics with serum potassium levels.

Main Results:

• Significant differences observed in P wave amplitude (lead II), QRS duration, T wave slope, and T wave amplitude:duration ratios between normokalemic and HK ECGs.
• P wave amplitude attenuation in lead II showed a stronger correlation with serum potassium than in V1.
• ECG metrics combining T wave and QRS amplitudes demonstrated better correlation with potassium levels than T wave metrics alone.

Conclusions:

• Statistically significant and quantifiable ECG metric differences exist between normokalemic and HK states.
• These ECG differences correlate with increasing serum potassium levels.
• Integration into ECG systems could improve severe HK identification.