Why are beta blockers used in hypertrophic cardiomyopathy?

Why are beta blockers used in hypertrophic cardiomyopathy?

Beta blockers decrease heart rate, reducing the heart’s workload. They prevent the worsening of obstruction that occurs with exercise, helping to decrease HCM symptoms.

How do mutations in myosin cause hypertrophic cardiomyopathy?

It has been hypothesized that mutations in β-cardiac myosin, the mechanoenzyme that drives ventricular contraction, cause HCM by affecting the power output of the myosin motor6. β-cardiac myosin is a hexamer consisting of two heavy chains, two essential light chains (ELC) and two regulatory light chains (RLC).

What is b myosin heavy chain?

The MYH7 gene provides instructions for making a protein known as the beta (β)-myosin heavy chain. This protein is found in heart (cardiac) muscle and in type I skeletal muscle fibers. (Skeletal muscle are the muscles used for movement.)

What genetic mutation causes hypertrophic cardiomyopathy?

Mutations in one of several genes can cause familial hypertrophic cardiomyopathy; the most commonly involved genes are MYH7, MYBPC3, TNNT2, and TNNI3. Other genes, including some that have not been identified, may also be involved in this condition.

Which beta blocker is best for Hocm?

Five different beta-blockers have been used in 12 studies in HCM. Propranolol was first studied in four early trials. One trial compared nadolol (beta-blocker) to verapamil (non-dihydropyridine calcium channel blocker) and found nadolol to be superior in terms of symptomatic relief.

Is hypertrophic cardiomyopathy genetic?

Hypertrophic cardiomyopathy is usually passed down through families (inherited). If you have a parent with hypertrophic cardiomyopathy, you have a 50% chance of having the genetic mutation for the disease.

Does HCM get worse with age?

HCM is a chronic disease that can get worse over time. This can lead to poorer function and quality of life, long-term complications and more financial and social burden. People with HCM often need to make lifestyle changes, such as limiting their activity, to adjust for their disease.

Why do you avoid ACE inhibitors in Hocm?

Agents to reduce pre- or afterload (such as nitrate, ACE inhibitors, nifedipine-type calcium antagonists) are contraindicated with HOCM due to possible aggravation of the outflow tract obstruction. This often impedes therapy of coexistent arterial hypertension.