![]() Multislice CT coronary angiography with prospective ECG-gating leads to a significant reduction of radiation dose when compared to that of retrospective ECG-gating, while offering comparable image quality and diagnostic value.Ĭopyright © 2011 Elsevier Ireland Ltd. A retrospective study is one in which you look backwards at data that have already been collected or generated, to answer a scientific (usually medical) problem. ![]() A group of people is chosen who do not have. The mean sensitivity and specificity of multislice CT angiography in the diagnosis of coronary artery disease was 97.7% (95% CI: 93.7%, 100%) and 92.1% (95% CI: 87.2%, 97%) for prospective ECG-gated scans 95.2% (95% CI: 91%, 99.5%) and 94.4% (95% CI: 88.5%, 100%) for retrospective ECG-gated scans, respectively, with no significant difference for sensitivity but significant difference for specificity (p=0.047). studies may be prospective or retrospective and sometimes two cohorts are compared. The mean dose length product was 225 mGycm (95% CI: 188, 262 mGycm) and 822 mGycm (95% CI: 630, 1013 mGycm) for the prospective and retrospective ECG-gated scans, respectively, indicating a statistically significant difference between these two protocols (p<0.0001). The mean effective dose of prospective ECG-gated scans was 4.5 mSv (95% CI: 3.6, 5.3 mSv), which is significantly lower than that of retrospective scans, which is 13.8 mSv (95% CI: 11.5, 16.0 mSv) (p<0.001). A prospective cohort study is a type of observational study focused on following a group of people (called a cohort) over a period of time, collecting data on their exposure to a factor of interest. The study usually involves taking a cohort of subjects and watching them over a long period. In other words, with retrospective studies, the sample sizes are fixed in a way thats counter-intuitive to how wed like to view the variables as explanatory. Then management decides to change accounting policy, so they need to go back and change all relevant information. A prospective study watches for outcomes, such as the development of a disease, during the study period and relates this to other factors such as suspected risk or protection factor(s). Unlike the prospective studies, a retrospective study usually does not need to follow patients into the future and often requires less time to conduct than a. It happens when the company has prepared the financial statement for several accounting periods. Effective dose, dose length product, image quality and diagnostic value were compared between two groups of studies.Ģ2 studies were included for analysis. Retrospective accounting is the accounting concept in which any change in accounting policy will impact all prior financial statements. ![]() To perform a systematic review of the radiation dose and diagnostic accuracy of prospective versus retrospective ECG-gated multislice CT coronary angiography.Ī search of Pubmed/Medline and Sciencedirect databases for English literature was performed to identify studies comparing prospective and retrospective ECG-gated multislice CT angiography in the diagnosis of coronary artery disease. ![]()
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