The cut off value for septal thickness above which the risk of sudden cardiac death is considered high in hypertrophic cardiomyopathy is:
a) 15 mm
b) 20 mm
c) 30 mm
d) 40 mm
Answer: c) 30 mm. Generally the risk of sudden cardiac death in hypertrophic cardiomyopathy is considered to be high in those with a septal thickness of 30 mm or more. Implantation of an ICD (Implantable Cardioverter Defibrillator) may be considered in such situations. Those with a family history of premature sudden death also have a high risk and so do those with a history of resuscitated cardiac arrest. Recurrent episodes of non sustained ventricular tachycardia and syncope are also considered as risk factors.