Brain imaging in lung cancer staging: A real-world, multi-centre study of prevalence of brain metastases, impact on treatment and re-modelling of the NICE health economic analysis.

INTRODUCTION: In 2019, the National Institute for Health and Care Excellence (NICE) updated their recommendations with respect to brain imaging in the staging of non-small cell lung cancer (NSCLC) based on an analytic cost-effectiveness model using published data and modelling assumptions from committee experts. In this study, we aimed to re-run this model using real-world multi-centre UK data. MATERIALS AND METHODS: Retrospective data was collected on consecutive patients with radically treatable clinical stage II and III lung cancer from eleven acute NHS Trusts during the calendar year 01/01/2018 to 31/12/2018. Following a written application to the NICE lung cancer guideline committee, we were granted access to the NG122 brain imaging economic model for the purpose of updating the input parameters in line with the real-world findings from this study. RESULTS: A total of 444 patients had data for analysis. The combined prevalence of occult brain metastases was 6.2% (10/165) in stage II and 6% (17/283) in stage III, compared to 9.5% and 9.3% used in the NICE economic model. 30% of patients with clinical stage III NSCLC and occult BMs on pre-treatment imaging went onto complete the planned curative intent treatment of extracranial disease, 60% completed SRS to the brain and 30% completed WBRT. This compares to 0%, 10% and 0% in the NICE assumptions. The health economic analysis concluded that brain imaging was no longer cost-effective in stage II disease (ICERs £50,023-£115,785) whilst brain imaging remained cost-effective for stage III patients (ICERs 17,000-£22,173), with MRI being the most cost-effective strategy. CONCLUSION: This re-running of the NICE health economic model with real-world data strongly supports the NICE guideline recommendation for brain imaging prior to curative-intent treatment in stage III lung cancer but questions the cost-effectiveness of CT brain imaging prior to curative-intent treatment in stage II lung cancer.

Tracheal stenosis mimicking severe acute asthma.

Post-intubation tracheal stenosis is a rare but serious clinical entity that rarely develops when intubation is less than a week. These patients may remain asymptomatic for a variable period and are often misdiagnosed as asthmatic. The authors report a case of a middle-aged lady who was initially misdiagnosed as having acute asthma after brief tracheal intubation.

Comparison of quantitative bronchoscopic lavage cultures (B-BAL) with blind NG tube lavage (N-BAL) cultures in the diagnosis of ventilator associated pneumonia (VAP).

OBJECTIVE: To compare quantitative Bronchoscopic Bronchoalveolar Lavage (B-BAL) cultures with blind nasogastric tube bronchoalveolar lavage (N-BAL) cultures in the diagnosis of Ventilator Associated Pneumonia (VAP). STUDY DESIGN: Cross-sectional comparative study. PLACE AND DURATION OF STUDY: The study was conducted in Medical ICU and Chest ICU at Liaquat National Hospital (LNH), Karachi, from January till August, 2007. METHODOLOGY: Patients admitted in ICU with clinical suspicion of VAP, fulfilling inclusion criteria viz. fever, leukocytosis, new or worsening infiltrate in chest radiograph or purulent secretions were included. Exclusion criteria were deranged coagulopathy, extreme ventilatory and oxygenation demands and tracheal obstruction. All patients had N-BAL using 16 fr Nasogastric tube (NG) without lubrication followed by B-BAL. Samples collected were submitted to the laboratory for quantitative cultures and sensitivities. Results were documented on predesigned proforma. RESULTS: Fifty four patients underwent paired B-BAL and N-BAL sampling. The N-BAL sensitivity and specificity for N-BAL were 87.87% and 85.71% respectively and p-value was <0.001. N-BAL showed sensitivity of 87.87%, specificity of 75.71%, positive predictive value of 89.65%, negative predictive value of 77.77% and p<0.001, which was statistically significant. Significant differences in time required for sample collection and cost of both procedures were also observed. CONCLUSION: The results favour the use of blind NG tube bronchoalveolar lavage quantitative cultures as it is simple, safe, cost-effective and minimally invasive method of diagnosing VAP.