Low flow low gradient aortic stenosis: clinical pathways

Area of Science:

• Cardiology
• Echocardiography
• Cardiac Physiology

Background:

• Severe aortic stenosis (AS) with left ventricular (LV) dysfunction and low cardiac output can present with low transvalvular gradients.
• This clinical presentation complicates differentiation from aortic sclerosis with LV dysfunction, necessitating precise diagnostic approaches.

Purpose of the Study:

• To review clinical pathways for assessing patients with low flow, low gradient aortic stenosis.
• To delineate diagnostic strategies for distinguishing severe AS with LV dysfunction from primary LV contractile dysfunction.

Main Methods:

• Utilizing dobutamine stress echocardiography (DSE) as a key diagnostic tool.
• Incorporating coronary angiography for patients with coexisting coronary artery disease.
• Evaluating global hemodynamic load and ventriculo-arterial impedance in specific patient subsets.

Main Results:

• Dobutamine stress echocardiography identifies preserved contractile reserve in AS patients, indicating benefit from valve replacement.
• Patients without contractile reserve require individualized critical evaluation.
• Coronary angiography is crucial for guiding surgical decisions in AS patients with concurrent coronary artery disease.

Conclusions:

• Accurate diagnosis of low flow, low gradient AS is critical for appropriate management.
• Dobutamine stress echocardiography plays a pivotal role in assessing contractile reserve and guiding therapeutic strategies.
• A comprehensive approach integrating hemodynamic assessment and imaging is essential for optimizing patient outcomes.