Idiopathic subaortic stenosis, also known as hypertrophic obstructive cardiomyopathy (HOCM), is a condition in which the heart muscle (myocardium) becomes abnormally thick, making it harder for the heart to pump blood effectively. In HOCM, the thickening occurs in the muscular wall (septum) that separates the left and right sides of the heart and obstructs blood flow out of the left ventricle, which can lead to symptoms such as chest pain, shortness of breath, dizziness, and fainting.
The term “idiopathic” means that the cause of the condition is unknown. However, there is evidence to suggest that HOCM may be caused by a genetic mutation that leads to the abnormal thickening of the heart muscle. The condition can be inherited in an autosomal dominant pattern, meaning that if one parent has the condition, there is a 50% chance that their child will inherit it as well.
Treatment for HOCM may involve medications to improve heart function and relieve symptoms, such as beta blockers, calcium channel blockers, or antiarrhythmic drugs. In some cases, surgical interventions may be necessary to relieve the obstruction, such as a septal myectomy or alcohol septal ablation.
If you have been diagnosed with idiopathic subaortic stenosis/HOCM or are experiencing symptoms that may be related to the condition, it is important to speak with a healthcare provider for an accurate diagnosis and appropriate treatment recommendations.