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Figure 1 Guidelines for evaluating pulmonary hypertension. Abbreviations: BNP = brain natriuretic peptide; CBC = complete blood count; CT = computerized tomography; CTD = connective tissue disease; EBCT = electron beam computerized tomography; HIV = human immunodeficiency virus; HRCT = high-resolution computerized tomography; LFTs = liver function tests; PH = pulmonary hypertension; RHC = right heart catheterization; SaO₂ = systemic arterial oxygen saturation; TEE = transesophageal echocardiography; VD = vasodilator; / = ventilation/perfusion.