title: Needle thoracostomy: implications of computed tomography chest wall thickness.
abstract: OBJECTIVE
  To determine the length of catheter required to perform a needle thoracostomy, as determined by chest wall thickness, to treat the majority of patients presenting to the emergency department (ED) with a potential tension pneumothorax.
  
  
  METHODS
  A convenience sample of 111 computed tomography (CT) scans of the chest in trauma and medical resuscitation patients at a military Level 1 trauma center in San Antonio, Texas, was pooled, and the chest wall thickness was measured at the second intercostal space, midclavicular line, to the nearest 0.1 cm.
  
  
  RESULTS
  The mean chest wall thickness in the patients studied averaged 4.24 cm (95% confidence interval [CI] = 3.97 to 4.52). Nearly one fourth (25) of the study patients had a chest wall thicker than 5 cm. Women, on average, have thicker chest walls than men (4.90 for women; 4.16 for men; p = 0.022).
  
  
  CONCLUSIONS
  In this study, a catheter length of 5 cm would reliably penetrate the pleural space of only 75% of patients. A longer catheter should be considered, especially in women.
authors.affiliation: Emergency Medicine Residency and Department of Radiology, San Antonio Uniformed Services Health Education Consortium, Brooke Army Medical Center/Wilford Hall Medical Center, San Antonio, TX 75390, USA. melissagivens@sbcglobal.net
authors.forename: Melissa L
authors.initials: ML
authors.lastname: Givens
authors.forename: Karen
authors.initials: K
authors.lastname: Ayotte
authors.forename: Craig
authors.initials: C
authors.lastname: Manifold
mesh_terms: D002404:Catheterization / Q000379:methods; D015505:Chest Tubes; D004632:Emergency Medical Services / Q000379:methods*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D011030:Pneumothorax / Q000000981:diagnostic imaging* / Q000601:surgery*; D012189:Retrospective Studies; D012737:Sex Factors; D035441:Thoracic Wall / Q000000981:diagnostic imaging*; D013907:Thoracostomy / Q000379:methods*; D014057:Tomography, X-Ray Computed