Why the study?
It remains unclear why certain individuals are more susceptible to arrhythmia-induced cardiomyopathy despite similar arrhythmia burdens, and determining the extent of an arrhythmia's contribution to LV systolic dysfunction is challenging.
Accurate diagnosis and treatment of arrhythmia-induced cardiomyopathy by eliminating the responsible arrhythmia can reverse left ventricular dysfunction and improve clinical outcomes.
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Consider arrhythmia contribution to new systolic HF; leaves open mechanisms of variable susceptibility and precise quantification tools.
Arrhythmias frequently accompany heart failure and left ventricular dysfunction. Tachycardias, atrial fibrillation, and premature ventricular contractions can induce a reversible form of dilated cardiomyopathy (CM) known as arrhythmia-induced CM (AiCM). The intriguing question is why certain individuals are more susceptible to AiCM, despite similar arrhythmia burdens. The primary challenge is determining the extent of arrhythmias' contribution to left ventricular systolic dysfunction. AiCM should be considered in patients with a mean heart rate of >100 beats/min, atrial fibrillation, or a PVC burden of >10%. Confirmation of AiCM occurs when CM reverses upon eliminating the responsible arrhythmia. Therapy choice depends on the specific arrhythmia, patient comorbidities, and preferences. After left ventricular function is restored, ongoing follow-up is essential if an abnormal myocardial substrate persists. Accurate diagnosis and treatment of AiCM have the potential to enhance patients' quality of life, improve clinical outcomes, and reduce hospital admissions and overall health care costs.
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Shoureshi et al. (2024) studied this question.
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