The endotracheal tube (ETT) leak test (LT), or audible leak test is a widely performed
assessment to verify appropriate tube size in neonates, infants and children. However, many
factors are known to influence the audible leak test. Even though the test is widely
performed, the accuracy has not been evaluated.
The endotracheal tube (ETT) leak test (LT), or audible leak when the peak airway pressures
reach 15-30 cmH2O, is a commonly performed assessment to confirm that an endotracheal tube
size is appropriate for a child in order to minimize the risk of airway injury and adverse
events after removal of ETT. Many factors are known to affect the results of the leak test
and variation in results among experienced anesthesiologists may be as great as 38%, but the
accuracy of the audible leak test by directly observing the presence of a leak around the
ETT has not been evaluated. This study will attempt to use direct visualization of the air
leak to correlate to and assess the accuracy of the audible air leak test.
- Children aged between 1 month (post-natal) and 8 years scheduled for ENT surgery
requiring general anesthesia with an endotracheal tube.
- Known history of subglottic stenosis
- Known history of recurrent croup
- Known history of endolaryngeal or subglottic lesions
- Parents refusal of participation in study