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Low-Gradient Aortic Stenosis; the Diagnostic Dilemma.

Osama Alkhalaila¹, Mansour Al Shehadat²

¹Department of Adult Cardiology, Heart Hospital, Hamad Medical Corporation, Doha, Qatar.

Heart Views : the Official Journal of the Gulf Heart Association

|June 27, 2022

Summary

Low-gradient aortic valve stenosis (AS) presents diagnostic challenges due to conflicting criteria. Early, accurate diagnosis of severe low-gradient AS is vital for timely intervention and improved patient outcomes.

Keywords:

Aortic stenosis left ventricular ejection fraction stress echocardiography

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Area of Science:

Cardiology
Cardiovascular Imaging
Interventional Cardiology

Background:

Low-gradient (LG) aortic valve stenosis (AS) is a complex subset of severe AS.
It poses diagnostic and management challenges due to conflicting criteria: a small valve area (≤1.0 cm²), but a low mean pressure gradient (<40 mmHg).
LG AS is subcategorized into normal-flow and low-flow (LFLG) types, with LFLG further divided by left ventricular ejection fraction (LVEF) into classical (depressed LVEF) and paradoxical (preserved LVEF).

Purpose of the Study:

To highlight the diagnostic complexities of low-gradient aortic valve stenosis.
To emphasize the importance of differentiating true severe AS from pseudosevere AS.
To underscore the prognostic implications and management strategies for LG AS.

Main Methods:

Diagnostic assessment primarily involves dobutamine stress echocardiography or multidetector computed tomography to confirm true severity.
Management of symptomatic severe LG AS typically involves aortic valve replacement (AVR), via surgical or transcatheter approaches.
Prognosis and outcomes are compared between LG AS and high-gradient AS patients.

Main Results:

Patients with LG severe AS generally have a worse prognosis and higher mortality rates than those with high-gradient severe AS.
Despite the survival benefits of AVR, patients with LG AS face higher post-procedural surgical risks compared to high-gradient AS patients.
Accurate and early diagnosis is critical for improving mortality and morbidity in LG AS patients.

Conclusions:

Low-gradient aortic valve stenosis requires careful diagnostic evaluation to distinguish true severity.
Aortic valve replacement offers survival benefits but carries increased risks in LG AS patients.
Timely recognition and appropriate management are essential for optimizing outcomes in low-gradient aortic valve stenosis.