What is a critical step in addressing a sucking chest wound?

A critical step in addressing a sucking chest wound is to seal the wound to prevent air from entering the pleural space. This type of injury can cause a pneumothorax, where air leaks into the chest cavity and can lead to lung collapse. By applying an airtight seal, you help restore the pressure in the pleural space, allowing for improved lung function and breathing.

A seal can be created using a variety of materials such as a plastic wrap, a specifically designed occlusive dressing, or even improvised items that can effectively block airflow. This intervention is vital as it minimizes the risk of worsening the pneumothorax or causing additional respiratory distress.

The other options do not address the immediate need to manage the wound appropriately. Performing CPR is not indicated unless the patient exhibits signs of cardiac arrest; positioning the patient lying flat may worsen the condition; and applying a cold compress does not contribute to managing a sucking chest wound effectively.