Optimal positioning for emergent needle thoracostomy: a cadaver-based study

Area of Science:

• Emergency Medicine
• Trauma Surgery
• Anatomy

Background:

• Needle thoracostomy is critical for tension pneumothorax relief.
• High failure rates are linked to improper needle placement.
• Current guidelines recommend the second intercostal space, midclavicular line.

Purpose of the Study:

• To evaluate needle thoracostomy placement in the fifth intercostal space, midaxillary line.
• To compare its success rate with the traditional second intercostal space placement.
• To test the hypothesis that the fifth intercostal space yields higher successful placement rates.

Main Methods:

• Twenty adult cadavers were used for evaluation.
• Needles were inserted into both the fifth and second intercostal spaces on both sides.
• Chest wall thickness was measured, and thoracotomy assessed needle penetration into the pleural cavity.

Main Results:

• 100% of needles in the fifth intercostal space successfully penetrated the chest cavity.
• Only 57.5% of needles in the second intercostal space were successful.
• The chest wall was, on average, 1 cm thinner at the fifth intercostal space.

Conclusions:

• The fifth intercostal space, midaxillary line offers a 100% success rate for needle thoracostomy in cadavers.
• This site is associated with a thinner chest wall, potentially improving needle placement success.
• Further clinical studies are needed to validate these cadaveric findings in live patients.