• Usually placed in the ‘Triangle of Safety’:
    • Anterior border of latissimus dorsi
    • The lateral border of the pectoralis major
    • A line superior to the horizontal level of the nipple (5th intercostal space)
    • Apex below the axilla
  • It is a safe place because of its location above the diaphragm and a very thin chest wall musculature, allowing rapid and minimally painful insertion
  • A more posterior position may be chosen in the presence of a locule but while this is safe:
    • Must be inserted under imaging
    • Not the preferred site as it is more uncomfortable for the patient to lie on after insertion, and there is a risk of the drain kinking
The 'triangle of safety' for chest drain insertion