patient records (ED and inpatient) were keyword searched for "pneumothorax" and x-rays were interrogated. We used HRG code DZ26B ("Pneumothorax without complications"), with a tariff of £1840.83 per episode to calculate cost implications. Measure of agreement of PSP size was assessed with Cohen's k.Results 43 confirmed pneumothorax cases were identified, 37 PSP. Of those with PSP: mean (SD) age was 28 (6.9) years, 31 (84%) were male, 23 (62%) were right sided. See Abstract P35 table 1 for assessment of PSP size. 21 (56.8%) had NA, successfully in 8 (38%). 17 (46%) patients had an ICD placed; 12 (70.6%) with <14F drains. Median length of stay following ICD was 5 (IQR 2e12) days. 28 (75.6%) had appropriate adherence to BTS guidelines (4 (10.8%) were not aspirated, 5 (13.5%) had a large, rather than small, ICD). 14 (37.8%) patients were sent for thoracoscopic surgery (on site), 4 (9.2%) PSP not resolving, 10 due to ipsi-, or contralateral, reoccurrence of PSP. If Nationally 10% of patients do not have NA as first line treatment, then (assuming a 40% success rate), this may be costing the NHS in England up to £438 412 a year in preventable admissions. Adherence to ACCP guidance would cost the NHS in England an extra £3.9 million in additional ICDs and hospital admissions. Conclusions ACCP and BTS guidance on PSP size have only poor-fair agreement. Local practice to increase NA rates and use of small drains should be adopted. Adherence to appropriate National guidelines has large healthcare economic implications.
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