Staging classification of aortic stenosis based on the extent of cardiac damage

Area of Science:

• Cardiology
• Cardiac Surgery
• Echocardiography

Background:

• Risk stratification for aortic valve replacement (AVR) in severe aortic stenosis (AS) traditionally relies on valve-related factors, symptoms, and comorbidities.
• Extravalvular cardiac damage is increasingly recognized as a significant factor influencing outcomes after AVR.

Purpose of the Study:

• To evaluate the prognostic impact of a novel staging classification for extravalvular cardiac damage in severe AS patients undergoing AVR.
• To determine if this staging system improves risk stratification for clinical outcomes post-AVR.

Main Methods:

• A cohort of 1661 patients with severe AS from the PARTNER 2 trials were retrospectively staged (Stage 0-4) based on echocardiographic evidence of extravalvular cardiac damage prior to AVR.
• One-year mortality was analyzed using Kaplan-Meier methods and multivariable Cox proportional hazards models.

Main Results:

• The study identified distinct stages of cardiac damage: Stage 0 (no damage), Stage 1 (left ventricular), Stage 2 (left atrial/mitral), Stage 3 (pulmonary/tricuspid), and Stage 4 (right ventricular).
• One-year mortality significantly increased with each stage of damage, ranging from 4.4% in Stage 0 to 24.5% in Stage 4 (Ptrend < 0.0001).
• The extent of cardiac damage was independently associated with increased mortality after AVR (HR 1.46 per stage increment).

Conclusions:

• A newly described staging classification objectively characterizes the extent of cardiac damage associated with AS.
• This staging system has significant prognostic implications for predicting clinical outcomes after AVR, offering enhanced risk stratification.