Table 3. Patient Diagnosis and Treatment at times of 1^st and 2^nd CPETs.

Pt	Diagnosis	CPET-1	Between CPETs	CPET-2
1	Congenital heart disease	None	None	None
2	Idiopathic	None	Bosentan → Sildenafil	Sildenafil
3	Idiopathic	None	None	None
4	Mitral valve disease	None	None	None
5	Idiopathic	None	Bosentan → Sildenafil	Sildenafil

Legend: CPET: Cardiopulmonary exercise test