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Background  Pulmonary artery involvement (PAI) in Takayasu arteritis (TAK) can lead to severe complications, but the relationship between the two has not been fully clarified.    Methods  We retrospectively investigated 166 consecutive patients with TAK who attended Kyoto University Hospital from 1997 to 2018. The demographic data, clinical symptoms and signs, comorbidities, treatments, and imaging findings were compared between patients with and without PAI. TAK was diagnosed based on the American College of Rheumatology Classification Criteria (1990) or the Japanese Clinical Diagnostic Criteria (2008). PAI was identified using enhanced computed tomography, magnetic resonance imaging, or lung scintigraphy.    Results  PAI was detected in 14.6% ( n  = 24) of total TAK patients. Dyspnea (25.0% vs. 8.6%;  p  = 0.043), pulmonary arterial hypertension (PAH) (16.7% vs. 0.0%;  p  < 0.001), ischemic heart disease (IHD) (29% vs. 9.3%;  p  = 0.018), respiratory infection (25.0% vs. 6.0%;  p  = 0.009), and nontuberculous mycobacteria (NTM) infection (20.8% vs. 0.8%;  p  < 0.001) were significantly more frequent, and renal artery stenosis (0% vs. 17%;  p  = 0.007) was significantly less frequent in TAK patients with PAI than in those without PAI. PAI and biologics were risk factors for NTM.    Conclusions  TAK patients with PAI more frequently have dyspnea, PAH, IHD, and respiratory infection, including NTM, than TAK patients without PAI.

The clinical features of pulmonary artery involvement in Takayasu arteritis and its relationship with ischemic heart diseases and infection