Objective: Epidemiological data on aneurysmal disease affecting the abdominal aorta in Latin American countries are limited. In our institution, the National Institute of Medical Sciences and Nutrition Salvador Zubiran (INCMNSZ), we have reported an Abdominal Aortic Aneurysm (AAA) prevalence of 3.26% in patients at risk from our Ultrasound (US) screening program. We aim to determine and compare the prevalence of undetected AAA in four different Metropolitan areas in Mexico to justify further US screening efforts.
Methods: A cross-sectional multicenter study was conducted in 9 different academic institutions. Abdominal Computed Tomographies (CT) from patients with age equal or greater than 55 years in our center (INCMNSZ), and in 65 year old patients and older in the remainder institutions were systematically reviewed. Abdominal aortic diameters were measured at the level of the superior (SMA) and inferior mesenteric arteries (IMA) in nonaneurysmal aortas and maximum diameters in the found AAA. Categorical data were analyzed by nonparametric statistic test at significance level (P < 0.05), the Pearson test was used to determine the correlation of age and aortic diameters.
Results: The cohort included a total of 12, 936 patients paired with respect gender (53% females, with a mean age of 69 years), the AAA prevalence found in the studied Mexican population was 3.08% (399 AAA patients). In centers where more than 200 CTs scans were reviewed, the prevalence was 4.03%, compared to the 4.63% found in centers with less than 200 studies (P = 0.41). In patients between the ages of 55 to 64 from INCMNSZ (3889 total), the prevalence was 0.77%, supporting the need of focused US-screening programs in individuals at the age of 65 and older in our country.
Conclusions: The introduction of a national US Screening Program for the detection of AAA in Mexico represents a challenge in our current health system. This Multicenter initiative demonstrates that our AAA prevalence is not different to other international reports; imaging screening might represent cost-effective strategy for reduction of aneurysm-related mortality.
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