Prognostic value of cardiopulmonary exercise testing parameters in young heart failure patients with moderately...

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Cardiopulmonary exercise testing (CPET) is crucial for prognosis in ambulatory heart failure (HF) patients.
• Interpreting CPET in young HF patients (≤50 years) presents unique challenges due to their generally optimistic outlook.
• This study focuses on the prognostic value of CPET parameters in this specific demographic.

Purpose of the Study:

• To evaluate the clinical impact of CPET parameters in predicting the prognosis of young, ambulatory HF patients.
• To identify key CPET metrics associated with major adverse cardiovascular events (MACE) within one year.
• To establish optimal thresholds for CPET parameters in risk stratification for young HF patients.

Main Methods:

• A retrospective observational study involving 113 young (≤50 years) HF patients with reduced ejection fraction (≤40%) and peak oxygen uptake (VO2) ≥12 mL/kg/min.
• Primary endpoint: occurrence of MACE (death, HF admission, fatal arrhythmia) within 1 year post-CPET.
• Statistical analyses included multivariate Cox regression and receiver operating characteristic (ROC) curve analysis.

Main Results:

• 39.8% of patients experienced MACE within one year.
• Multivariate analysis identified age, brain natriuretic peptide, serum creatinine, and ventilatory efficiency (VE/VCO2 slope) as significant predictors of MACE.
• ROC analysis determined a VE/VCO2 slope of 31 as the optimal cutoff for predicting prognosis.

Conclusions:

• Nearly 40% of young HF patients with moderate exercise capacity face MACE within a year.
• A VE/VCO2 slope ≥31 in young HF patients signals a need for closer monitoring and potential consideration for advanced therapies.
• CPET parameters, particularly the VE/VCO2 slope, are valuable tools for risk-stratifying young ambulatory HF patients.