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V/Q CTPA Group Low probability Intermediate probability High probability Negative Positive A (n = 78) 2 1 75 38 40 B (n = 149) 134 7 8 148 1 V/Q Diagnosis Intermediate probability (n = 7) IPAH (n = 4) IPAH and emphysema (n = 1) ASD and pulmonary fibrosis (n = 1) Pulmonary fibrosis (n = 1) High probability (n = 8) IPAH (n = 3) PVOD (n = 1) APAH and ASD (n = 2) Scleroderma and pulmonary fibrosis (n = 1) Apical bullae: apical mismatch on V/Q (n = 1) IPAH = idiopathic pulmonary arterial hypertension; ASD = atrial septal defect; PVOD = pulmonary venoocclusive disease; APAH = associated pulmonary arterial hypertension.