TABLE 2.

Responses of sildenafil-treated patients (n=14) and control group (n=14)^*

Variable	Baseline control group	Baseline sildenafil group	4 ± 2 months after sildenafil	Δ% after sildenafil	P value¶
peak V̇O2, L • min−1	0.79 ± 0.18	0.84 ± 0.11	0.91 ± 0.10	8.8	0.074
peak V̇O2, ml •min−1•kg−1	11.34 ± 0.57	11.41 ± 1.15	12.38 ± 0.94	8.8	0.050
AT, L • min−1	0.61 ± 0.04	0.61 ± 0.06	0.67 ± 0.05	4.1	NS
V̇E/V̇CO2	50 ± 2.9	49 ± 2.3	43 ± 2.2	−14.9	0.009
peak WR, watts	57 ± 5.4	60 ± 10	68 ± 8.9	13.7	0.050
PetCO2, mmHg	27 ± 1.5	26 ± 1.5	30 ± 1.9	10.4	0.006
rest HR	81 ± 4.4	88 ± 1.9	87 ± 2.3	−1.2	NS
peak HR, bpm	136 ± 5.1	139 ± 5.0	139 ± 4.4	0.1	NS
peak O2 pulse, ml•min−1•beat−1	6.2 ± 0.4	6.1 ± 0.7	6.8 ± 0.8	10.0	0.014
Lowest SaO2, %	92 ± 1.5	90 ± 2.3	90 ± 2.3	0.4	NS
peak RER	1.16 ± 0.03	1.18 ± 0.03	1.21 ± 0.03	2.4	NS

^*values are ± SEM

^¶post-sildenafil compared to baseline