Subvalvular Aortic Stenosis.

مقایسه نتایج درمانی بالون والوپلاستی و والوتومی جراحی در بیماران مبتلا به تنگی مادرزادی دریچه آئورت در پیگیری 6 ساله در بخش کودکان بیمارستان قلب شهید رجایی تهران

Background: Balloon valvuloplasty is a relatively new technique for relief of obstruction of aortic valve. The primary results of this procedure are similar to surgical valvotomy with fewer complications and mortality. Materials and methods: One hundred fifty-five patients with congenital aortic stenosis were enrolled in this study over a period of 6 years (1991-1997). Participants were all un...

Subvalvular gradients in patients with valvular aortic stenosis: prevalence, magnitude, and physiological importance.

BACKGROUND Although subvalvular gradients in patients with aortic stenosis have been described, their behavior and response to exercise have not been well characterized. METHODS AND RESULTS Left ventricular and aortic pressures and linear flow velocity were measured with a catheter-tip manometer at rest and during supine exercise in 27 patients with valvular aortic stenosis. A subvalvular gra...

Surgical relief of diffuse subvalvular aortic stenosis.

CONGENITAL valvular aortic stenosis and congenital localized subvalvular aortic stenosis are commonly encountered, easily recognized at operation, and relieved by standard surgical technics. Idiopathic diffuse subvalvular aortic stenosis is uncommon and can be overlooked at operation. Its relief by indirect methods has been proposed by some because of the problems inherent in its exposure in di...

Discrete subvalvular aortic stenosis: is the presence of upstream complex blood flow disturbances an important pathogenic factor?

Background. Discrete fixed subvalvular aortic stenosis can occur as an isolated abnormality or in association with other cardiac anomalies, especially ventricular septa] defect, persistent patent ductus arteriosus or coarctation of the aorta (1-4) . It most often presents as a crescent-shaped ridge of fibroelastic tissue protruding from the left septal surface into the subaortic region or as a ...

Fluid dynamics of aortic stenosis: subvalvular gradients without subvalvular obstruction.

Analysis of a tapering, pulsatile flow field predicts that substantial subvalvular pressure gradients exist in patients with valvular aortic stenosis (AS) without invoking a second anatomic site of obstruction. Using a catheter with two laterally mounted micromanometers, we examined the left ventricle in 11 patients with AS, mean age 64 +/- 11 years (+/- SD); the mean valve area was 1.0 +/- 0.3...

Subvalvular membranous aortic stenosis. Results of surgical therapy.