AB0384 IMPACT OF TEMPORAL ARTERY ULTRASOUND ON SURVIVAL OF PATIENTS WITH GIANT CELL ARTERITIS

Abstract

Background:Giant cell arteritis (GCA) is the most common primary systemic vasculitis in adults over 50 years of age. Its incidence increases with age, with a peak between 70-80 years and predominates in women, 3:1. It is a medical emergency that, if not diagnosed, can lead to irreversible complications. The delay in time from diagnosis to start of treatment is crucial to avoid possible serious outcomes on short, medium and long term. Survival in GCA is estimated between 60-90% at 5 years and 48-81% at 10 years. Efforts have been made to implement rapid diagnostic circuits to assess patients and initiate treatment without delay with good results both in reducing permanent vision loss and in reducing the costs of these patients due to emergency visits and admissions. The morbidity and mortality of this disease is high, but the use of efficient diagnostic strategies, such as ultrasound of superficial temporal arteries, has proven to be a useful, practical, cost-effective and, above all, quick tool to make the diagnostic approach.Objectives:Analyze the impact of early temporal artery ultrasound on survival for patients with GCA.Methods:Survival study of 48 patients with GCA, in two different “stages” in terms of diagnostic approach: Group A (n = 27), patients diagnosed between 2002 - 2011 using only ACR 1990 criteria and Group E (n = 21) diagnosed between 2010-2015 using ACR criteria and TAUS. TAUS was performed by Rheumatologists with extensive experience in ultrasound and within a period of no more than 7 days for these patients. The definitive diagnosis of GCA was based on the clinical criteria of the Rheumatologist within the clinical and analytical context and with the specific complementary examinations for each case (Ultrasound, PET-CT, biopsy). Demographic data, comorbidities, signs and symptoms at debut, analytical data, complementary examinations, treatment and evolution were obtained retrospectively through the electronic medical record of the patient, based on the database of our GCA cohort. A survival analysis was performed considering death as the main outcome. The statistic used was the Kaplan-Meier test. In addition, other complications related to treatment or pathology are collected.Results:The mean age at diagnosis of our patients was 79 + - 6 years, with a female: male ratio of 3: 1. The follow-up was between 2 and 16 years with a mean of 5.8 + - 3 years, until the last visit collected or until the outcome of death. Group A had a survival at 5 and 10 years of 53.4% and 36.7% respectively, while group E of 79.5% at both cut-off points. (Figure 1).There is a significant difference between the survival of both groups, p <0.01, this being better in the group in which TAUS was implemented for rapid diagnosis (group E). The main causes of death were cardiovascular events, 30%, predominantly in group E (75%), and infection, 30%, predominantly in group A. The median from diagnosis to death was 3 years (range 1 - 13).Figure 1.Group A (red line) according to ACG 1990 criteria and Group B (green line) according to ACG criteria and implementing TAUS for rapid diagnosisConclusion:The implementation of temporal artery ultrasound (TAUS) is associated with a significant improvement in the survival rate of patients with GCA and a reduction in treatment-related complications in patients who were diagnosed with ultrasound in less than 7 days compared to those diagnosed by the conventional healthcare attention routes.