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Refractory hypokalemia while weaning off bypass.

Rashmi Soori1, Aanchal Dixit2, Prabhat Tewari2

  • 1Department of Anesthesiology, K.S. Hegde Medical Academy, Mangalore, Karnataka, India.

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Summary

Hypokalemia, or low potassium levels, is a critical concern in cardiac patients, especially those with severe mitral stenosis undergoing valve replacement. Prompt intravenous potassium supplementation is essential to prevent dangerous heart arrhythmias.

Keywords:
Cardiopulmonary bypasshypokalemiamagnesiumrefractory

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Internal Medicine

Background:

  • Hypokalemia is defined as serum potassium < 3.5 mEq/L, requiring intravenous supplementation when < 3 mEq/L.
  • Cardiac patients are susceptible to hypokalemia due to factors like poor intake, diuretic use, and heart failure.
  • Severe mitral stenosis poses risks for electrolyte imbalances, particularly potassium deficiency.

Observation:

  • A 23-year-old female with severe mitral stenosis presented with dyspnea and was diagnosed with profound hypokalemia (2.3 mEq/L) during mitral valve replacement surgery.
  • Electrocardiogram (ECG) revealed a sine wave pattern, and transesophageal echocardiography showed global hypokinesia.
  • Arterial blood gas (ABG) analysis confirmed the low potassium level, indicating a critical state.

Findings:

  • Hypokalemia can precipitate atrial and ventricular arrhythmias, especially during weaning from cardiopulmonary support.
  • Potassium is vital for maintaining normal cardiac contractility and electrical stability.
  • Refractory hypokalemia may indicate a concurrent magnesium deficiency, necessitating co-treatment.

Implications:

  • Aggressive management of hypokalemia is crucial in cardiac surgery patients to prevent life-threatening arrhythmias.
  • Monitoring and correcting electrolyte imbalances, including potassium and magnesium, are paramount for patient outcomes.
  • Understanding the multifactorial causes of hypokalemia in heart disease aids in targeted therapeutic interventions.