Demographic and laboratory data may predict positive temporal artery biopsy

Area of Science:

• Rheumatology
• Pathology
• Clinical Medicine

Background:

• Giant cell arteritis (GCA) diagnosis often involves temporal artery biopsy (TAB).
• There is a need to improve diagnostic accuracy and reduce negative TAB procedures.
• Evaluating clinical and laboratory predictors of positive TAB is crucial.

Purpose of the Study:

• To identify clinical and laboratory criteria that correlate with positive TAB results for GCA.
• To minimize the number of negative TABs performed in suspected GCA cases.

Main Methods:

• Retrospective review of patients undergoing TAB between 2002 and 2009 at two urban medical centers.
• Multivariate analysis of patient demographics, clinical signs/symptoms, laboratory data, and pathological outcomes.

Main Results:

• GCA was confirmed in 24% of TABs.
• Older age (mean 77.8 vs 73.1 years) was significant (P=0.0227).
• Ethnicity was significant (P=0.0005), with Caucasians (39% positive) and Hispanics (17% positive) differing from African-Americans (3% positive).
• Elevated erythrocyte sedimentation rate (ESR) had 100% sensitivity but only 16% specificity for GCA.
• Headache or visual disturbances did not predict a positive biopsy.

Conclusions:

• Screening patients with normal ESR or identifying lower-risk individuals may reduce negative TABs.
• Utilizing alternative diagnostic modalities for lower-risk patients could improve efficiency.