Research Article

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

Table 3

MVI scoring system weighted for .

CUM IVIMVI = CUM IVI/7RangeSeverityNYHA

0.000.00<1Normaln/a
7.001.001 and <2Normal-mildI
14.002.002 and <3Mild-moderateII
21.003.003 and <4Moderate-severeIII
28.004.00≥4Severe-very severeIV