Unusual electrocardiographic finding--bifascicular block due to hyperkalemia

Area of Science:

• Cardiology
• Electrophysiology
• Internal Medicine

Background:

• Bundle branch blocks and hemiblocks are critical electrocardiographic findings.
• Hyperkalemia is a known cause of cardiac arrhythmias and conduction abnormalities.
• Bifascicular block, a combination of two fascicular blocks, requires careful etiological consideration.

Observation:

• A unique case of bifascicular block (right bundle branch block and left posterior hemiblock) was observed.
• These electrocardiographic abnormalities were directly attributed to severe hyperkalemia.
• The patient's condition presented as a sudden onset intraventricular block.

Findings:

• The presented electrocardiographic abnormalities, including bifascicular block, were unprecedented in association with hyperkalemia.
• Prompt resolution of the electrocardiographic abnormalities was achieved through hemodialysis.
• Normalization of serum potassium levels correlated with the disappearance of the conduction blocks.

Implications:

• Hyperkalemia should be recognized as a significant etiological factor in the differential diagnosis of bundle branch blocks, hemiblocks, and bifascicular blocks.
• Sudden onset of intraventricular conduction delays warrants prompt assessment for electrolyte disturbances, particularly hyperkalemia.
• This case underscores the reversible nature of certain conduction abnormalities when the underlying metabolic derangement is addressed.