Cardiopulmonary Exercise Testing and HFpEF: Diagnostic and Therapeutic Perspectives

Background: Heart failure with preserved ejection fraction (HFpEF) is a complex and heterogeneous clinical syndrome that represents an increasing global health challenge due to its high rates of morbidity, hospitalization, and mortality. In this context, cardiopulmonary exercise testing (CPET) has emerged as a valuable diagnostic modality, particularly in patients presenting with unexplained exertional dyspnea and inconclusive resting imaging results. Objectives and Clinical Implications: This narrative review examines current evidence on the clinical relevance and prognostic value of CPET parameters in HFpEF. Peak VO2, a marker of aerobic capacity and cardiovascular fitness, has established prognostic value in heart failure with reduced ejection fraction (HFrEF). However, its prognostic significance in HFpEF remains less well defined. Oxygen pulse has emerged as another important measure for evaluating functional capacity and predicting response to exercise-based interventions, offering potential prognostic insight into adverse outcomes in HFpEF. Finally, the VE/VCO2 slope, an index of ventilatory efficiency during exercise, also holds clinical relevance in HFpEF, particularly with concomitant pulmonary hypertension, though evidence remains heterogeneous. Conclusions: CPET-derived variables are valuable parameters for HFpEF assessment. Their systematic integration into clinical evaluation of HFpEF patients could guide individualized management strategies and inform clinicians for improving outcomes in this challenging condition.