Document Classification

Section Type: RESULTS

Text: In the sildenafil group only, at 3 and 6 months we observed reduction of systolic pulmonary artery pressure (from 33. 7 to 25. 2 mm Hg and 23. 9 mm Hg), ergoreflex effect on ventilation (from 6. 9 to 2. 3 l x min (-1) and 1. 9 l x min (-1)), ventilation to CO2 production slope (V (E) / VCO2, from 35. 5 to 32. 1 and 29. 8), and breathlessness (score) (from 23. 6 to 16. 6 and 17. 2), and an increase of FMD (from 8. 5 % to 13. 4 % and 14. 2 %), peak VO2 (from 14. 8 to 18. 5 ml x min (-1) x kg (-1) and 18. 7 ml x min (-1) x kg (-1)), and ratio of VO2 to work rate changes (from 7. 7 to 9. 3 and 10. 1).