✓ Correct answer: D. Treatment of choice is beta blocker and ICD.Catecholamine sensitive polymorphic ventricular tachycardia (CPVT) is a genetic disorder that affects the heart's electrical system. It is caused by mutations in genes that control calcium channels in the heart muscle cells, not the ryanodine receptor as mentioned in option A. These mutations disrupt the normal regulation of calcium, leading to abnormal heart rhythms.<br/><br/>Option B states that bidirectional ventricular tachycardia is not seen in CPVT. This is incorrect. In fact, bidirectional ventricular tachycardia is a characteristic feature of CPVT. It is characterized by alternating directions of ventricular beats on an electrocardiogram (ECG).<br/><br/>Option C states that exercise is not associated with sudden cardiac death in CPVT. This is also incorrect. Exercise or emotional stress can trigger ventricular arrhythmias in individuals with CPVT, and it is a significant cause of sudden cardiac death in affected individuals.<br/><br/>The correct treatment for CPVT involves a combination of beta blockers and implantable cardioverter-defibrillator (ICD) therapy. Beta blockers help to prevent the excessive release of catecholamines (stress hormones) during physical or emotional stress, reducing the risk of arrhythmias. ICDs are implanted devices that can deliver electrical shocks to restore normal heart rhythm if a life-threatening arrhythmia occurs.<br/><br/>Therefore, option D is the incorrect statement as it misrepresents the recommended treatment for CPVT.
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