Table 1

Accuracy of tracer gas technique in the detection of a persistent pleural leak requiring further procedure

Sensitivity (%) Specificity (%) PPV (%) NPV (%) Prevalence of ID/RA (%)
All groups9555679250
Primary SP9559669345
Secondary SP9543718660
  • SP = spontaneous pneumothorax; PPV = positive predictive value; NPV = negative predictive value; ID = intercostal chest drain; RA = re-aspiration.