Transition from chronic compensated to acute decompensated heart failure: pathophysiological insights obtained from...

Area of Science:

• Cardiology
• Heart Failure Pathophysiology
• Echocardiography and Hemodynamics

Background:

• Heart failure (HF) affects approximately half of patients with reduced ejection fraction (systolic HF [SHF]) and half with preserved ejection fraction (diastolic HF [DHF]).
• The precise pathophysiological distinctions between DHF and SHF remain incompletely understood.
• This study aimed to elucidate these differences using advanced monitoring techniques.

Purpose of the Study:

• To investigate the pathophysiological differences between systolic heart failure (SHF) and diastolic heart failure (DHF).
• To examine chronic compensated and acute decompensated heart failure in both SHF and DHF patient groups.
• To utilize echocardiographic and implantable hemodynamic monitor data for comprehensive analysis.

Main Methods:

• Patient stratification into SHF (ejection fraction [EF] <50%) and DHF (EF ≥50%) groups.
• Collection of echocardiographic and implantable hemodynamic monitor data.
• Analysis of key hemodynamic parameters including estimated resting pulmonary artery diastolic pressure (ePAD) and diastolic distensibility index.

Main Results:

• SHF patients (n=204) had lower EF (24±10%) and larger end-diastolic dimensions compared to DHF patients (n=70, EF 58±8%).
• DHF patients exhibited a higher diastolic distensibility index (0.11±0.06 mm Hg/mL) than SHF patients (0.06±0.04 mm Hg/mL).
• Acute decompensation in both groups was associated with a significant increase in ePAD, indicating elevated diastolic pressures.

Conclusions:

• Significant structural and functional disparities exist between SHF and DHF.
• Elevated diastolic pressures are a critical factor in the pathophysiology of both chronic and acute heart failure, irrespective of ejection fraction.
• Understanding these differences is crucial for targeted therapeutic strategies in heart failure management.