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[Moderate cardiac failure: oxygen consumption during exercise predicts ultrafiltration results]
G Lauri1, G Marenzi, P G Agostoni
1Istituto di Cardiologia, Università degli Studi, Centro di Studio per le Ricerche Cardiovascolari del CNR, Fondazione I Monzino, IRCCS, Milano.
Cardiologia (Rome, Italy)
|April 1, 1994
Summary
Extracorporeal ultrafiltration (UF) improves exercise capacity in heart failure (HF) patients. Patients with higher baseline physical performance (VO2p ≥ 18 ml/min/kg) showed no significant improvement after UF.
Area of Science:
- Cardiology
- Nephrology
- Exercise Physiology
Context:
- Heart failure (HF) management often involves addressing fluid overload.
- Extracorporeal ultrafiltration (UF) is a therapeutic option for HF patients.
- The threshold for UF benefit in HF patients is not well-defined.
Purpose:
- To determine the pre-UF physical performance level above which UF does not provide clinical benefits in moderate heart failure patients.
- To identify predictors of UF response in HF patients using cardiopulmonary exercise testing.
Summary:
- This study investigated 29 stable heart failure (HF) patients (NYHA class II-III) undergoing UF.
- Patients were assessed using cardiopulmonary exercise tests (CPET) pre-UF, and 4 days and 3 months post-UF.
- A significant increase in peak oxygen consumption (VO2p) and oxygen consumption at anaerobic threshold (VO2AT) was observed in 18 patients (Group II), but not in 9 patients (Group I).
- Unresponsive patients (Group I) had baseline VO2p ≥ 18 ml/min/kg and VO2AT ≥ 13 ml/min/kg.
- Baseline VO2p and VO2AT inversely correlated with the changes in these parameters post-UF.
Impact:
- Identifies a VO2p threshold (≥ 18 ml/min/kg) above which UF offers limited benefit in HF.
- Provides objective criteria for patient selection for UF therapy.
- Suggests UF is most beneficial for HF patients with lower baseline exercise capacity.