A Multivariable Index for Grading Exercise Gas Exchange Severity in Patients with Pulmonary Arterial Hypertension and Heart Failure

Table 4

MVI scoring system weighted for the slope of change and magnitude of change in PetCO₂ (indicative of exercise induced PH).

MVIPH	Modifier
≥0	0.00
<0 and >−5	0.50
≥−5 and >−10	0.75
≤−10	1.00