BACKGROUND:This study was undertaken to identify the prevalence of pulmonary embolism(PE) in the emergency department(ED) of an urban teaching hospital and also to test a Bayesian model in estimating the number of CT ...
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BACKGROUND:This study was undertaken to identify the prevalence of pulmonary embolism(PE) in the emergency department(ED) of an urban teaching hospital and also to test a Bayesian model in estimating the number of CT pulmonary angiography(CTA) expected to be performed in an emergency ***:The data for this study was obtained through a retrospective review of electronic medical records for all ED patients suspected of PE who underwent chest CTA or ventilation perfusion scanning(V/Q) between 2009 and *** data is presented as means and standard deviation for continuous variables and percentages with 95%confidence intervals(95%CI) for *** prevalence of PE was used as pre-test probability in the Bayesian ***-test probability was obtained using a Fagan nomogram and likelihood ratios for ***:A total of 778 patients(560 females) with mean age of 50 years(range 18-98 years)were enrolled(98.3%underwent chest CTA and 1.7%underwent V/Q scan).A total of 69 patients had PE,rendering an overall prevalence of 8.9%(95%CI,7.1%to 11.1%) for *** calculated that132 CTA's per year could be avoided in our institution,without compromising safe exclusions of PE(keeping post-test probability of PE below 2%).CONCLUSIONS:Despite differences in our patient populations and /or study designs,the prevalence of PE in our institution is about average compared to other *** proposed model for calculating redundant chest CTA is simple and can be used by institutions to identify overuse of CTA.
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