الفهرس 
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Abstract
Aortic stenosis is a narrowing of the aortic valve. The aortic valve allows blood to flow from the heart’s lower left ventricle into the aorta and to the body. Stenosis prevents the valve from opening properly, forcing the heart to work harder to pump blood through the valve. This causes pressure to build up in the left ventricle and thickens the heart muscle.
There are no medical treatments available that can stop the calcification process, identification of modifiable lifestyle factors that can prevent or delay the development of AVS is highly desirable. Yet, the modifiable risk factors for AVS are unclear, but positive associations have been observed with body mass index , hypertension ,low-density lipoprotein cholesterol levels and dyslipidemia.
Aortic valve stenosis (AVS) is the most common valvular heart disease .The prevalence of aortic stenosis is only about 0.2% among adults between the agesof 50 and 59 years but increases to 9.8% in octogenarians, with an overall prevalence of 2.8% in adults older than 65 years of age.
Aortic stenosis occurred more often for men only in young patients (linked to bicuspid aortic valve) while after 75 years of age, female sex seems to be more prevalent.
Aortic stenosis causes an increase in after load and ventricular wall stress that stimulates hypertrophy of the left ventricular myocardium. This initially restores wall stress and preserves the left ventricular function, whereas increasing levels of hypertrophy seems to be maladaptive.
The degree of hypertrophic response seems to have important clinical implications. Patients with inappropriately high left ventricular mass have increased mortality compared with patients having a comparable valve narrowing but more moderate hypertrophy.
The study was carried out on fifteen patients with isolated severe aortic stenosis diagnosed by TTE , prostheticaortic valve replacement was performed to all patients and then Evaluated all patients as preoperative and compared left ventricular function ,mass and mass index of all patients pre and postoperative .
All patients were subjected to :
1. Thorough taking personal data like Name , Age ,gender , Body surface area (BSA)
2. Full clinical examination and taking full