Final answer:
The over-expansion injury characterized by swelling in the neck area with a crackling sensation is subcutaneous emphysema.
Step-by-step explanation:
Subcutaneous emphysema is an over-expansion injury where air escapes into the subcutaneous tissues, leading to swelling in the neck area. This condition is often associated with a distinctive crackling or crepitus sensation felt upon touching the swollen region. Subcutaneous emphysema can result from various causes, including trauma or injury to the airways or lungs, allowing air to accumulate beneath the skin.
The crackling sensation is due to the presence of air trapped in the subcutaneous tissue, creating a palpable and audible crepitus. While subcutaneous emphysema itself may not be life-threatening, it often indicates an underlying issue such as a pneumothorax or a more severe injury that requires prompt medical attention.
Recognition and understanding of subcutaneous emphysema are critical for healthcare professionals, particularly those in emergency medicine. Timely assessment and identification of the underlying cause are essential to guide appropriate treatment and prevent potential complications associated with over-expansion injuries.