There is a great vessel in heart known as aorta which supplies pure blood to different parts of the body.
Aorta is having a valve at its origin.
When there is an obstruction either at the level of valve, below or above the valve, it is known as valvular, subvalvular or supravalvular aortic stenosis respectively.
The most common etiology of aortic valve obstruction in neonates and is bicuspid aortic valve.
Child presentation depends on age of the child and severity of the obstruction.
If newborn babies are having severe variety of aortic stenosis then they are generally in shock due to low perfusion to the body.
In mild form, children are asymptomatic and illness is detected on routine examination by a child doctor by hearing an abnormal heart sound in the form of murmur on clinical examination.
As severity of obstruction increases, child presents with early tiredness, decrease exercise tolerance, chest pain, loss of consciousness (syncope) and in later stages with shortness of breath (dyspnea due to heart failure) and rarely sudden cardiac death.
Best modality for detection of aortic stenosis is by ECHOCARDIOGRAPHY.