Final answer:
In HOCM patients with pre-existing LBBB, the suitable intervention depends on the severity of symptoms. Treatment options may include medications, ICD implantation, or surgical procedures.
Step-by-step explanation:
In patients with hypertrophic obstructive cardiomyopathy (HOCM) who have a pre-existing left bundle branch block (LBBB), the appropriate intervention would depend on the severity of symptoms and complications. LBBB itself may not require any specific intervention unless it is causing significant symptoms such as heart failure or conduction disturbances. If symptomatic, individualized treatment may include medications like beta-blockers or calcium channel blockers, implantation of an implantable cardioverter-defibrillator (ICD) for high-risk patients, or even surgical procedures like septal myectomy or alcohol septal ablation to relieve left ventricular outflow obstruction.