title: Iatrogenic pneumothorax: marker gas technique for predicting outcome of manual aspiration.
abstract: BACKGROUND
  Although manual aspiration is used for treating pneumothorax, the post-aspiration radiograph may not be a reliable indicator of whether the pleural leak remains. We have previously shown that marker gas can identify an air leak in patients with spontaneous pneumothoraces.
  
  
  OBJECTIVE
  This study examines whether a marker gas technique can be safely used to manage patients with iatrogenic pneumothoraces.
  
  
  METHODS
  10 patients with iatrogenic pneumothorax were identified among a cohort referred for manual aspiration of pneumothorax, using a marker gas technique, in which inspired metered-dose inhaler propellant gas is detectable in pneumothorax aspirate using a portable flame ioniser. The presence of marker gas was taken to imply a persistent air leak.
  
  
  RESULTS
  Marker gas was detected in the aspirate from 3 out of 10 pneumothoraces. 2 required intercostal tube drainage because of lung collapse following initial aspiration and 1 was treated conservatively. Marker gas was not detected in 7 cases (2 post-pacemaker insertion, 5 pleural aspiration +/- biopsy), and in all these cases, manual aspiration resulted in sustained re-expansion of the lung. There was a trend towards a significant relationship between the presence or absence of marker gas and the need for a further intervention (p = 0.055).
  
  
  CONCLUSIONS
  The presence or absence of a pleural leak during manual aspiration of iatrogenic pneumothorax can be demonstrated by this technique. The absence of marker gas in the aspirate implies that manual aspiration will be successful, whereas its presence, in most cases, predicts either failure of manual aspiration to expand the lung or early re-collapse of the lung.
authors: Department of Thoracic Medicine, Ipswich Hospital NHS Trust, Ipswich, UK.
authors: D G
authors: DG
authors: Kiely
authors: W A
authors: WA
authors: Davey
authors: V
authors: V
authors: Mahadevan
authors: D
authors: D
authors: Seaton
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005740:Gases; D006801:Humans; D008297:Male; D008875:Middle Aged; D011030:Pneumothorax / Q000175:diagnosis* / Q000628:therapy*; D011237:Predictive Value of Tests; D013396:Suction; D016896:Treatment Outcome
chemical_list: D005740:Gases