Upper respiratory tract and orofacial manifestations of new-onset giant cell arteritis: results from a large, prospective inception cohort study.

Giant cell arteritis (GCA) often features upper respiratory tract (URT) and orofacial manifestations, which signal the involvement of external carotid artery branches. In this study, we aimed to describe the frequency of various URT/orofacial symptoms at GCA onset, as well as the main characteristics of patients presenting these symptoms. We included all patients who were newly diagnosed with GCA between 1976 and April 2022 at the Internal Medicine Department of a tertiary-care hospital. Ten URT or orofacial symptoms were prospectively examined systematically in each patient. We used multivariate analyses to identify the GCA characteristics, including URT/orofacial symptoms, associated with temporal artery biopsy (TAB) positivity. At least 1 URT/orofacial symptom was present in 68.6% of the 599 patients (3 or more symptoms in 30% of cases). Jaw claudication, maxillary pain, and pain during mouth opening were the most prevalent symptoms. Dry cough was recorded in 17% of cases. GCA patients with URT/orofacial symptoms had more clinical abnormalities of the temporal artery bed and ischaemic ophthalmological complications, but less large-vessel vasculitis according to imaging. The likelihood of a positive TAB was increased in patients with an abnormal temporal artery upon clinical examination (OR 4.16; CI 2.75-6.37, p < 0.001) or jaw claudication (OR 2.18; CI 1.35-3.65, p = 0.002), and decreased in those with hoarseness (OR 0.47; CI 0.26-0.87, p = 0.02) or earache (OR 0.54; CI 0.31-0.95, p = 0.03). Isolated URT/orofacial presentation (i.e., without headache or visual signs) accounted for 5.2% of the entire cohort. Oral-facial symptoms were present in two-thirds of GCS cases. Thus, they could serve as leading clinical clues for a GCA diagnosis, and are a risk factor for permanent visual loss. Several URT/orofacial symptoms such as jaw claudication, hoarseness, and earache influenced the likelihood of a positive TAB. Isolated URT/orofacial presentation of GCA is a rare but potentially challenging occurrence.