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20 February 2018 Is Low-Dose Radiation Exposure a Risk Factor for Atherosclerotic Disease?
Paula Boaventura, Cecília Durães, Adélia Mendes, Natália Rios Costa, Inês Chora, Sara Ferreira, Emanuel Araújo, Pedro Lopes, Gilberto Rosa, Pedro Marques, Sofia Tavares, Vanessa Chaves, Paulo Bettencourt, Inês Oliveira, Francisco Costa, Isabel Ramos, Maria José Teles, João Tiago Guimarães, Manuel Sobrinho-Simões, Paula Soares
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Abstract

Nontargeted late effects of radiation include an increased risk of cardiovascular disease, although this is still debatable in the context of low-dose radiation. Tinea capitis patients treated in childhood with X rays to induce scalp epilation received a low dose of radiation to their carotids. To better clarify this issue, we evaluated carotid atherosclerosis in a cohort of such patients treated in 1950–1963 in Portugal. A group of 454 individuals randomly chosen from previously observed Portuguese tinea capitis patients and a control group mainly composed of their spouses (n = 280) were enrolled. Cardiovascular risk factors such as waist circumference, body mass index, blood pressure and tobacco consumption, as well as biochemical measurements were obtained. Ultrasound imaging of carotid arteries for intima media thickness and stenosis evaluation were performed according to a standardized protocol. In comparison to the control group, the irradiated cohort members were significantly older, more frequently never smokers, hypertensive, and presented higher glycated hemoglobin and alkaline phosphatase levels. In addition, the irradiated cohort showed a higher frequency of carotid stenosis ≥30% than the nonirradiated group (13.9% vs. 10.7%), although this was not significant (P = 0.20). Stenosis was ≥50% in 2.9% of the irradiated group and 0.4% of the nonirradiated group (P = 0.02). Likewise, the frequency of intima media thickness ≥1 mm was significantly higher in the irradiated group (16.8% vs. 10.7%; P = 0.02). Multivariate analysis, including other cardiovascular risk factors, showed that exposure to low-dose radiation increased the risk of carotid stenosis by ≥50% [odds ratio (OR) = 8.85; P = 0.04] and intima media thickness by ≥1 mm (OR = 1.82; P = 0.02). These findings confirm that low-dose exposure is a risk factor of carotid atherosclerotic disease.

©2018 by Radiation Research Society.
Paula Boaventura, Cecília Durães, Adélia Mendes, Natália Rios Costa, Inês Chora, Sara Ferreira, Emanuel Araújo, Pedro Lopes, Gilberto Rosa, Pedro Marques, Sofia Tavares, Vanessa Chaves, Paulo Bettencourt, Inês Oliveira, Francisco Costa, Isabel Ramos, Maria José Teles, João Tiago Guimarães, Manuel Sobrinho-Simões, and Paula Soares "Is Low-Dose Radiation Exposure a Risk Factor for Atherosclerotic Disease?," Radiation Research 189(4), 418-424, (20 February 2018). https://doi.org/10.1667/RR14942.1
Received: 14 September 2017; Accepted: 1 January 2018; Published: 20 February 2018
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