M. Schwaiblmair, C. Faul, W. von Scheidt, T. M. Berghaus
[Applied Cardiopulmonary Pathophysiology 15: 71-80, 2011]
Background: The objective of the study was to quantify the cardiopulmonary exercise testing (CPET) parameters in patients with pulmonary arterial hypertension after beginning of a specific pharmacotherapy (calcium channel blocker, endothelin receptor antagonist, prostanoid and/or phosphodiesterase inhibitor).
Methods: 49 patients with a mean pulmonary arterial pressure of 45 mmHg underwent 3-monthly CPET during a follow-up of 24 months.
Results: After 3 months, peak oxygen uptake (14.0 ± 1.0 versus 15.7 ± 1.1 ml/min/kg) and oxygen pulse (8.4 ± 0.5 versus 9.4 ±0.6 ml/min/beat) significantly (p<0.001) improved. In the long-term follow-up we objectified significant differences (p < 0.05) in anaerobic threshold (8.3 ± 0.9 versus 10.7 ± 0.9 ml/min/kg) and oxygen pulse (7.4 ± 0.5 versus 8.4 ± 0.6 ml/min/beat). Ventilatory efficiency remained unchanged during follow-up.
Conclusions: Ventilatory efficiency remains unchanged by the implementation of specific pharmacotherapy in contrast to significantly improved power capacity, oxygen uptake, anaerobic threshold and oxygen pulse.
Key words: exercise test, hypertension, pulmonary, pharmacotherapy, pulmonary gas exchange
Martin Schwaiblmair, PhD
University of Munich