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- Title
Regional Variation of Computed Tomographic Imaging in the United States and the Risk of Nephrectomy.
- Authors
Welch, H. Gilbert; Skinner, Jonathan S.; Schroeck, Florian R.; Zhou, Weiping; Black, William C.
- Abstract
<bold>Importance: </bold>While computed tomography (CT) represents a tremendous advance in diagnostic imaging, it also creates the problem of incidental detection-the identification of tumors unrelated to the clinical symptoms that initiate the test.<bold>Objective: </bold>To determine the geographic variation in the United States in CT imaging and the corresponding association with one of the most consequential sequelae of incidental detection: nephrectomy.<bold>Design, Setting, and Participants: </bold>This study is a cross-sectional analysis of age-, sex-, and race-adjusted Medicare data (January 2010-December 2014) from 306 hospital referral regions (HRRs) in the United States and includes information from 15 million fee-for-service Medicare beneficiaries age 65 to 85 years.<bold>Exposures: </bold>Regional CT risk (ie, the proportion of the population receiving either a chest or abdominal CT over 5 years).<bold>Main Outcomes and Measures: </bold>Five-year risk of nephrectomy (partial or total).<bold>Results: </bold>Data from 15 million fee-for-service Medicare beneficiaries age 65 to 85 years were gathered and illustrate that 43% of Medicare beneficiaries age 65 to 85 years received either a chest or abdominal CT from January 2010 to December 2014. This risk varied across the HRRs, ranging from 31% in Santa Cruz, California, to 52% in Sun City, Arizona. Increased regional CT risk was associated with a higher nephrectomy risk (r = 0.38; 95% CI, 0.28-0.47), particularly among HRRs with more than 50 000 beneficiaries (r = 0.47; 95% CI, 0.31-0.61). After controlling for HRR adult smoking rates, imaging an additional 1000 beneficiaries was associated with 4 additional nephrectomies (95% CI, 3-5). Case-fatality rates for those who underwent nephrectomy were 2.1% at 30 days and 4.3% at 90 days.<bold>Conclusions and Relevance: </bold>Fee-for-service Medicare beneficiaries are commonly exposed to CT imaging. Those residing in high-scanning regions face a higher risk of nephrectomy, presumably reflecting the incidental detection of renal masses. Additional surgery should be considered one of the risks of excessive CT imaging.
- Subjects
UNITED States; COMPARATIVE studies; COMPUTED tomography; REPORTING of diseases; KIDNEY tumors; RESEARCH methodology; MEDICAL cooperation; MEDICAL referrals; MEDICARE; RESEARCH; EVALUATION research; CROSS-sectional method; FEE for service (Medical fees); NEPHRECTOMY
- Publication
JAMA Internal Medicine, 2018, Vol 178, Issue 2, p221
- ISSN
2168-6106
- Publication type
journal article
- DOI
10.1001/jamainternmed.2017.7508