Paradoxical Low Flow Aortic Stenosis

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...

Paradoxical Low - Flow , Low - Gradient Aortic Stenosis : New

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Paradoxical low-flow, low-gradient aortic stenosis: new evidence, more questions.

Role of Transesophageal Echocardiography in the Diagnosis of Paradoxical Low Flow, Low Gradient Severe Aortic Stenosis

BACKGROUND AND OBJECTIVES Prior studies indicate that up to 35% of cases of severe aortic stenosis (AS) have paradoxical low flow, low gradient despite preserved left ventricular ejection fraction (LVEF). However, error in left ventricular outflow tract (LVOT) diameter may lead to misclassification. Herein, we determined whether measurement of LVOT diameter by transesophageal echocardiography (...

Paradoxical Low-Flow, Low-Gradient Aortic Stenosis–a Tough Nut to Crack in Echocardiographic Diagnosis

Refer to the page 82-88 In this issue, Abudiab et al. 1) evaluated the characteristics of paradoxical low-flow low-gradient (PLF-LG) aortic stenosis (AS) among subjects who had been diagnosed with severe AS using conventional transthoracic echocardiography (TTE). The authors tried combining transesophageal echocardiography (TEE) with TTE to measure the left ventricular outflow tract (LVOT) diam...