Final answer:
The most likely explanation for the sudden respiratory and clinical change in the 1-month-old infant is a tension pneumothorax. Common signs and symptoms include sudden respiratory distress, decreased breath sounds on the affected side, asymmetric chest rise, and cyanosis.
Step-by-step explanation:
The most likely explanation for the sudden respiratory and clinical change in the 1-month-old infant is a tension pneumothorax.
Tension pneumothorax occurs when air enters the pleural space between the lung and the chest wall and cannot escape. The trapped air causes increased pressure in the chest, which can compress the lungs, impairing their ability to expand and exchange oxygen and carbon dioxide.
Common signs and symptoms of tension pneumothorax include sudden respiratory distress, decreased breath sounds on the affected side, asymmetric chest rise, and cyanosis.