Is post-pneumonia chest X-ray for lung malignancy useful? Results of an audit of current practice

BACKGROUND/AIM

Patients with community-acquired pneumonia (CAP) are often screened with repeat chest X-ray within 6-12 weeks following an admission. This practice is aimed to detect underlying lung malignancy, which can be difficult to identify initially when an acute infiltrate is present on X-ray. We conducted a study on the use of follow-up chest X-rays after an admission with CAP to determine the yield of suspected or diagnosed cancer.

METHODS

During the 2-year period, January 2010-January 2012, we evaluated all patients over the age of 50 who had no previous history of lung cancer and were admitted to Hutt Hospital with CAP.

RESULTS

A total of 302 patients was included. Of these, 53% received a follow-up chest X-ray within 6-12 weeks after admission. A total of six patients (2.0%) was diagnosed with lung cancer based on a chest X-ray within 6-12 weeks after admission. After a median period of follow up of 19.5 months, a further five patients who had normal chest X-ray were diagnosed with lung malignancy.

CONCLUSION

The majority of patients were screened with follow-up X-rays. The yield from a 6- to 12-week chest X-ray following CAP is low, which is consistent with previous studies. The development of clear guidelines to ensure identification of patient groups at significantly high risk of lung cancer is important to increase the sensitivity of screening. High yielding strategies, such as low-dose computed tomography, should be considered as an alternative.

Quantitative Thin Layer Chromatographic Multi-Sulfonamide Screening Procedure: Collaborative Study

A thin layer chromatographic procedure suitable for detection of multiple sulfonamides at 0.1 ppm was studied in an interlaboratory collaborative study. Sulfamethazine, sulfadimethoxine, and sulfaquinoxaline were variously analyzed in liver and muscle tissues from swine, turkey, and duck. The average recovery for all drugs across all tissues was 95%. The corresponding repeatability and reproducibility were 7.7% and 10.5%, respectively.