Physician Compliance to Choosing Wisely® Initiative in Radiographic Imaging of Low Risk Prostate Cancer in an Integrated Health Care System.

Background: We evaluated the adherence of urologists within an integrated health care system to Choosing Wisely®, an initiative aimed at avoiding unnecessary medical tests. In urology, 2 of the guidelines state bone scans and pelvic computerized tomography scans are unnecessary in low risk prostate cancer.

Methods: We performed a retrospective study on patients diagnosed with low risk prostate cancer between January 1, 2010 and December 31, 2017 at Kaiser Permanente Southern California. All demographics and imaging data were obtained. Patients with symptoms concerning for metastatic disease or with other malignancies were excluded by chart review. Statistical analysis was employed to compare the use of bone scans and computerized tomography scans in this population before and after the Choosing Wisely guidelines were published.

Results: Of the 6,996 patients, 121 (1.7%) and 96 (1.4%) underwent a bone scan and computerized tomography scan, respectively. A Cochran-Armitage test showed no change after implementation of the statements. Logistic regression analysis revealed that for every point increase in prostate specific antigen, the odds ratio was 1.09 for ordering both a bone scan and computerized tomography scan. When compared to Whites, the odds ratio of having a bone scan and computerized tomography scan were 0.35 and 0.37 for Blacks, 0.30 and 0.38 for Hispanics, and 0.47 and 0.61 for Asians, respectively.

Conclusions: Over the study period, there were low rates of inappropriate imaging for low risk prostate cancer. There was no change in trend after publication of the Choosing Wisely. Higher prostate specific antigen levels and White ethnicity were predictors for ordering inappropriate imaging.