Utilization and Yield of CT Urography: Are the American Urological Association Guidelines for Imaging of Patients With Asymptomatic Microscopic Hematuria Being Followed?

Is the excretory phase necessary to identify upper tract urothelial neoplasms at CT urography? A 10-year population-based study

PURPOSE

To assess the proportion of upper tract urothelial carcinomas (UTUC) that are evident without the excretory phase at CT urography (CTU), and the proportion of potentially avoidable radiation.

METHODS

UTUCs diagnosed between January 2008-December 2017 were retrospectively identified from a population-based cancer registry. For each patient, US, non-urographic CT, and MRI exams were assessed for a primary mass and secondary imaging findings (hydronephrosis, urinary tract thickening, luminal distention, fat stranding, and lymphadenopathy/metastatic disease). CTUs were assessed for primary and secondary findings, and whether the tumor was evident as a filling defect on excretory phase. The dose-length product (DLP) of potentially avoidable excretory phases was calculated as a fraction of total DLP.

RESULTS

288 patients (mean age, 72±11 years, 165 males) and 545 imaging examinations were included. Of 192 patients imaged with 370 non-urographic CTs, a primary mass was evident in 154 (80.2%), secondary findings were evident in 172 (89.6%), and primary or secondary findings were evident in 179 (93.2%). Of 175 CTUs, primary and secondary findings were evident in 157 (89.7%) and 166 (94.9%) examinations, respectively, and primary or secondary findings were evident in 170/175 (97.1%). 131/175 (74.9%) UTUCs were evident as a filling defect, including the 5/175 (2.9%) UTUCs without primary or secondary findings. Of 144 CTUs with available DLP data, the proportion of potentially avoidable radiation was 103.7/235.8 (44.0%) Gy⋅cm.

CONCLUSION

In our population, almost all UTUCs were evident via primary or secondary imaging findings without requiring the excretory phase. These results support streamlining protocols and pathways.

Persistent asymptomatic isolated microscopic hematuria in adolescents is not associated with an increased risk for early onset urinary tract cancer

OBJECTIVE

To elucidate the association between adolescent microscopic hematuria and early onset urothelial carcinoma and renal cell carcinoma.

METHODS

Nationwide, population-based, retrospective cohort study using medical data of 970,366 adolescents aged 16 through 19 years (58.6% male) examined for fitness for military service between 1980 and 1997. Diagnoses of persistent isolated microscopic hematuria were given after thorough work up process excluding any other renal abnormalities. Incident cases of urothelial carcinoma and renal cell carcinoma diagnosed during the years of 1982 to 2012 were retrieved from the Israeli National Cancer Registry. Cox proportional hazards models were used to estimate the hazard ratio (HR) separately for urothelial carcinoma and renal cell carcinoma.

RESULTS

During a cumulative follow-up of 22,115,629 person-years (median follow-up, 22.8), persistent isolated microscopic hematuria was diagnosed among 5509 (0.6%) adolescents. Urothelial carcinoma and renal cell carcinoma developed in 332 (3 among those with persistent isolated microscopic hematuria) and 292 (2) individuals, respectively. The adjusted HR for incident urothelial carcinoma among adolescents with isolated microscopic hematuria was 1.17 (95% CI, 0.38-3.66) and the adjusted HR for renal cell carcinoma was 1.02 (95% CI, 0.25-4.12).

CONCLUSIONS

Persistent asymptomatic isolated microscopic hematuria at adolescence was not associated with increased risk for urothelial carcinoma nor renal cell carcinoma.

Wording of American Urological Association Guideline Recommendations Does Not Signal the Strength of Recommendation

OBJECTIVE

To systematically analyze the wording of American Urological Association (AUA) clinical practice guidelines' recommendations.

MATERIALS AND METHODS

We systematically identified all AUA guideline documents that used the current AUA framework and extracted the individual recommendations, their statement type, and their corresponding evidence level (if applicable), and analyzed the recommendation wording separating out the modal verbs (eg, should, may, or must) as well as the main verbs (eg, recommend, treat, perform). We performed descriptive statistics using SPSS Version 27.

RESULTS

We included 18 documents with 754 distinct recommendations; the median number of recommendations per guideline was 36 (interquartile range: 29; 48.5). Expert opinion was the most used statement type (193; 25.6%), followed by clinical principle (156; 20.7%). Four-hundred-four recommendations were either strong, moderate, or conditional: 135 (17.9%), 187 (24.8%) and 83 (11.0%), respectively. Most recommendation statements (701; 93.0%) used modal verbs to express a level of obligation. Overall, "should" was the most employed modal verb used (73.9%), followed by "may" (17.6%) and "must" (1.5%). Both "may" and "should" were used in conjunction with all five statement types, whereas "must" was limited to strong recommendations and clinical principles.

CONCLUSION

The wording of AUA recommendation statements does not signal the strength of recommendation and the intended level of obligation, which may represent a barrier to guideline implementation. More consistent wording of recommendations by strength may improve guideline understanding, uptake, and adherence.