Electrolyte Abnormalities in Patients Presenting With Ventricular Arrhythmia (from the LYTE-VT Study)

Area of Science:

• Cardiology
• Electrolyte balance
• Critical care medicine

Background:

• Electrolyte abnormalities can trigger ventricular arrhythmias.
• Patients with heart disease on diuretics are at risk for electrolyte depletion.
• Understanding electrolyte status in VT/VF is crucial for patient management.

Purpose of the Study:

• To determine the prevalence of electrolyte depletion in patients with sustained ventricular tachycardia/fibrillation (VT/VF) compared to heart failure (CHF).
• To identify risk factors associated with electrolyte depletion, particularly hypokalemia, in VT/VF patients.

Main Methods:

• A comparative study of consecutive hospital admissions for VT/VF versus CHF.
• Data collected from electronic medical records between July 2016 and October 2018.
• Analysis included patient demographics, ejection fraction (EF), and electrolyte levels (potassium, magnesium).

Main Results:

• Hypokalemia (K < 3.5 mmol/L) was significantly more prevalent in VT/VF patients (35.7%) than in CHF patients (12.9%) (p < 0.001).
• Severe hypokalemia (K < 3.0 mmol/L) was also higher in VT/VF patients (13.6%) versus CHF patients (2.7%) (p = 0.001).
• Gastrointestinal illness (OR: 11.1) and recent diuretic dose increase (OR: 21.9) were strongly linked to severe hypokalemia in VT/VF patients (p < 0.001).

Conclusions:

• Hypokalemia is highly prevalent in patients presenting with VT/VF, exceeding that seen in CHF alone.
• Gastrointestinal illness and increased diuretic dosage are significant risk factors for severe hypokalemia in VT/VF.
• Early intervention targeting these risk factors may reduce arrhythmia risk.