# Which clinical factors are predictive of outcome in primary spontaneous pneumothorax management?

## TL;DR

This study identifies clinical factors that predict treatment failure in primary spontaneous pneumothorax patients, focusing on symptom duration and timing of presentation.

## Contribution

The study introduces a novel analysis of clinical predictors for treatment failure in primary spontaneous pneumothorax management.

## Key findings

- 26.7% of patients failed treatment, with symptom duration and timing of presentation as significant predictors.
- Patients presenting at least one day after symptom onset had a 61% lower risk of treatment failure.
- Further research is needed to understand psychological factors influencing treatment outcomes.

## Abstract

Primary spontaneous pneumothorax (PSP) occurs when air leaks into the pleural space in patients without known underlying lung disease, causing pain and breathlessness. Optimal management of PSP is not defined and we are unable to predict who will fail medical treatment (ongoing pneumothorax with prolonged air leak). We hypothesised that patients with longer symptom duration and higher symptom scores would be more likely to fail treatment.

Prospectively collected data from the Randomised Ambulatory Management of Primary Pneumothorax randomised controlled trial of ambulatory management were used to determine which clinical factors are associated with treatment failure including symptom scores, time from symptom onset to presentation, treatment allocation, vital signs, history of prior pneumothorax and size of initial pneumothorax.

Overall, 63/236 patients (26.7%) failed treatment. On average, symptoms started 1 day before admission. Multivariable analysis found that patients who presented at least 1 day after symptoms began had a lower risk of treatment failure than those presenting on the day symptoms began (ORs 0.39 (0.18 to 0.81)).

Further work is required to determine psychological drivers of PSP presentation and risks of prolonged air leak.