arrhythmogenic right ventricular & left atrial cardiomyotathy/dystlasia

my mothers cause of death was arrhythmogenic right ventricular & left atrial cardiomyotathy/dystlasia. I read online that when that when someone is conflicted with this that you need to shock the heart back to the normal rhythm. is this true

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This is what I found on it. I don't know that a defibulator would have corrected the problem.

Arrhythmogenic Right Ventricular Dysplasia
Arrhythmogenic right ventricular dysplasia (ARVD) is a rare type of cardiomyopathy. ARVD develops when the muscle tissue in the right ventricle dies and is replaced with scar tissue. This process causes problems in the heart's electrical signaling, resulting in arrhythmias. Symptoms include a feeling of strong or irregular heartbeats (palpitations) and fainting after exercise.

ARVD usually develops in teens or young adults and is often the cause of sudden cardiac death in young athletes. ARVD is thought to be an inherited disease.