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
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| CUM IVI | MVI = CUM IVI/7 | Range | Severity | NYHA |
| 0.00 | 0.00 | <1 | Normal | n/a | 7.00 | 1.00 | 1 and <2 | Normal-mild | I | 14.00 | 2.00 | 2 and <3 | Mild-moderate | II | 21.00 | 3.00 | 3 and <4 | Moderate-severe | III | 28.00 | 4.00 | ≥4 | Severe-very severe | IV |
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