Left ventricular outflow tract obstruction

What it means

Left ventricular outflow tract (LVOT) obstruction can occur at the valvular, subvalvular, or supravalvular level. In general, there is an obstruction to forward flow which increases afterload, and if untreated, can result in hypertrophy, dilatation, and eventual failure of the left ventricle.

Common causes of left ventricular outflow tract (LVOT) obstruction include subaortic stenosis, bicupsid aortic valve, supravalvar aortic stenosis, coarctation of the aorta, and hypertrophic cardiomyopathy. Note that we reserve this term to describe the physiological abnormality, and denote the morphological abnormalities that lead to LVOT obstruction in the corresponding Morphology sections of the HPO.

Rare diseases that can present with this7

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category