ABSTRACT
OBJECTIVES: Computed tomography pulmonary angiogram (CTPA) is one of the most commonly ordered and frequently overused tests. The purpose of this study was to evaluate the mean radiation dose to patients getting CTPA and to identify factors that are associated with higher dose. MATERIAL AND METHODS: This institutionally approved retrospective study included all patients who had a CTPA to rule out acute pulmonary embolism between 2016 and 2018 in a tertiary care center. Patient data (age, sex, body mass index [BMI], and patient location), CT scanner type, image reconstruction methodology, and radiation dose parameters (dose-length product [DLP]) were recorded. Effective dose estimates were obtained by multiplying DLP by conversion coefficient (0.014 mSvâ¢mGy-1â¢cm-1). Multivariate logistic regression analysis was performed to determine the factors affecting the radiation dose. RESULTS: There were 2342 patients (1099 men and 1243 women) with a mean age of 58.1 years (range 0.2-104.4 years) and BMI of 31.3 kg/m2 (range 12-91.5 kg/m2). The mean effective radiation dose was 5.512 mSv (median - 4.27 mSv; range 0.1-43.0 mSv). Patient factors, including BMI >25 kg/m2, male sex, age >18 years, and intensive care unit (ICU) location, were associated with significantly higher dose (P < 0.05). CT scanning using third generation dual-source scanner with model-based iterative reconstruction (IR) had significantly lower dose (mean: 4.90 mSv) versus single-source (64-slice) scanner with filtered back projection (mean: 9.29 mSv, P < 0.001). CONCLUSION: Patients with high BMI and ICU referrals are associated with high CT radiation dose. They are most likely to benefit by scanning on newer generation scanner using advance model-based IR techniques.
ABSTRACT
Hypertension (HTN) is particularly burdensome in low-income groups. Federal-qualified health centers (FQHCs) provide care for low-income and medically underserved populations. To assess the rates and predictors of blood pressure (BP) control in an FQHC in Michigan, a retrospective analysis of all patients with HTN, coronary artery disease, and/or diabetes mellitus (DM) seen between January 2006 and December 2008 was conducted. Of 212 patients identified, 154 had a history of HTN and 122 had DM. BP control was achieved in 38.2% of the entire cohort and in 31.1% of patients with DM. The mean age was lower in patients with controlled BP in both the total population (P=.05) and the DM subgroup (P=.02). A logistic regression model found only female sex (odds ratio, 2.27; P=.02) to be associated with BP control and a trend towards an association of age with uncontrolled BP (odds ratio, 0.97; P=.06). BP control in nondiabetics was 47.8% vs 31.1% in diabetic patients (P=.02). We found that patients who attended the FQHC had a lower rate of BP control compared with the national average. Our study revealed a male sex disparity and significantly lower rate of BP control among DM patients.