Asymptomatic latent syphilis in geriatric patients in association with stoke: Analysis using routine syphilis tests

We investigated the association between stroke and asymptomatic latent syphilis (ALS) in geriatric patients. This retrospective observational study included patients aged >65 years who underwent routine qualitative rapid plasma reagin (RPR) and Treponema pallidum Latex Agglutination (TPLA) tests at a 161-bed community acute care hospital with long-term care facilities in Kamakura, Japan, from August 2014 to February 2019. Asymptomatic patients with a positive TPLA test result were diagnosed with ALS. Ninety-six patients with ALS were included in the study. Fifty-one patients (53.1%) had a positive RPR test. Comorbidities included hypertension (n = 44; 45.8%), chronic kidney disease (n = 44; 45.8%), and fracture (n = 29; 30.2%). No significant differences were found in sex, age, or comorbidities in univariate analyses. Multivariate analysis of the TPLA-positive geriatric patients revealed that a positive RPR test (odds ratio = 9.06; 95% confidence interval = 1.69–48.5; p = 0.01) was associated with a history of stroke. For geriatric patients with ALS, a positive qualitative RPR test was associated with a history of stroke. Medical evaluation and management of the risk factors for stroke are more necessary for ALS with a positive RPR qualitative test.