This systematic review and meta-analysis examined how results from cardiopulmonary exercise testing relate to outcomes in people with chronic obstructive pulmonary disease. The analysis combined data from sixteen different articles involving patients with this lung condition to look at connections between test variables and health events. The researchers compared these new variables against standard composite indices used to measure disease severity.
The study found that peak oxygen uptake and ventilatory efficiency were associated with mortality. Specifically, ventilatory efficiency was identified as a significant marker, while peak oxygen uptake showed an inconsistent independent association in multivariable models. The review also looked at severe acute exacerbations and hospitalization, but the evidence for these outcomes was limited and inconsistent across the included studies.
Three of the sixteen studies had a high risk of bias, and there was significant variation in how metrics were measured and adjusted. Because of these limitations and the inconsistent nature of the data, the authors caution against using these specific CPET variables for routine prognostic stratification. The main takeaway is that while these tests show exercise capacity, they are not yet ready for standard risk prediction beyond the modified BODE index.