Pseudo P pulmonale pattern associated with severe hypokalemia.

Area of Science:

• Cardiology
• Electrophysiology
• Internal Medicine

Background:

• Electrocardiography (ECG) is crucial for diagnosing cardiac conditions.
• Tall P waves can indicate conditions like P pulmonale, suggesting right atrial enlargement.
• Hypokalemia, or low serum potassium, can affect cardiac electrical activity.

Observation:

• A 54-year-old male presented with lower extremity weakness and ECG findings of tall P waves (0.32 mV in lead II).
• Initial serum potassium level was critically low at 1.21 mmol/L.
• These ECG abnormalities were observed concurrently with severe hypokalemia.

Findings:

• Potassium supplementation led to a decrease in P wave amplitude, with normalization of the ECG.
• The tall P waves were determined to be a pseudo P pulmonale pattern, not true P pulmonale.
• This suggests a direct correlation between hypokalemia and the observed ECG morphology.

Implications:

• Clinicians should consider hypokalemia in the differential diagnosis of tall P waves on ECG.
• Recognizing the pseudo P pulmonale pattern associated with hypokalemia can prevent misdiagnosis and guide appropriate treatment.
• This finding underscores the importance of electrolyte balance in maintaining normal cardiac electrical function.