منابع مشابه
Paradoxical Low-Flow, Low-Gradient Aortic Stenosis
Low-flow, low-gradient aortic stenosis (AS) is a highly challenging condition in terms of diagnosis and therapeutic management. The transvalvular pressure gradient is inversely related to the square of aortic valve area (AVA) and directly related to the square of flow. Hence, a patient with severe AS may nonetheless present with a low gradient if his or her left ventricular (LV) output is reduc...
متن کاملLow "gradient", low flow aortic stenosis.
Correspondence to: Dr John Chambers, Cardiothoracic Centre, St Thomas Hospital, London SE1 7EH, UK; jboydchambers@ aol.com _________________________ A ortic stenosis is thought to have a long, asymptomatic latent phase during which the risk of sudden death is low. In fact symptoms can be revealed by treadmill exercise in a large proportion of apparently asymptomatic patients. Patients may limit...
متن کاملLow-gradient aortic stenosis
Low-gradient aortic stenosis (AS) has been a vexing problem for cardiologists since its original description in 1980 by Carabello et al.1 In that study, 3 of 4 patients with low-gradient AS died at surgery, and the other patient had persistent severe heart failure postoperatively. Subsequent studies showed that although operative mortality is high, most patients survive aortic valve replacement...
متن کاملPredictors of Outcomes in Low-Flow, Low-Gradient Aortic Stenosis
Background—Patients with low-flow, low-gradient aortic stenosis have a poor prognosis with conservative therapy but a high operative mortality if treated surgically. Recently, we proposed a new index of aortic stenosis severity derived from dobutamine stress echocardiography, the projected aortic valve area at a normal transvalvular flow rate, as superior to other conventional indices to differ...
متن کاملCirculation Topic Review Low-Flow/Low-Gradient Aortic Stenosis
Aortic stenosis (AS) is 1 of the most common valve disorders encountered in clinical practice and 1 of the most frequent indications for valve replacement surgery. Decades of research and clinical experience have resulted in the development of guidelines that provide the clinician with an evidence-based approach to the management of patients with valvular disease.1 Nonetheless, there remain pat...
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ژورنال
عنوان ژورنال: Circulation: Cardiovascular Imaging
سال: 2012
ISSN: 1941-9651,1942-0080
DOI: 10.1161/circimaging.111.971127