What are 6 indirect causes of respiratory complications in a trauma patient?

• A. Bleeding, abdominal distension, pain, shock, SIRS, MODS
• B. Bleeding, fever, infection, pain, shock
• C. Hypoxia, tachypnea, cyanosis, edema
• D. Headache, nausea, vomiting, dizziness

Answer: (A)

In trauma, respiratory problems often arise from systemic and secondary effects of injury rather than from a direct lung injury alone. Bleeding causes hypoperfusion and anemia, lowering oxygen delivery and forcing the body to strain to maintain ventilation; shock from blood loss worsens tissue perfusion and can lead to pulmonary edema and atelectasis through fluid shifts, making breathing less effective. Abdominal distension can push up on the diaphragm, reducing rib cage expansion and diaphragmatic excursion, which promotes shallow breathing and atelectasis, increasing the risk of pneumonia. Pain from injuries or procedures discourages deep breaths and effective coughing, further promoting atelectasis and secretion retention. Shock itself compounds poor oxygen delivery and can drive respiratory failure via worsened hypoxemia and metabolic acidosis, amplifying ventilatory demand. The inflammatory surge in SIRS increases capillary permeability, driving noncardiogenic pulmonary edema and possible acute lung injury or ARDS. If multiorgan dysfunction develops, the lungs are often affected as well, leading to diffuse alveolar damage and respiratory failure. Collectively, these factors create respiratory complications by disrupting ventilation, gas exchange, and lung mechanics in the early aftermath of trauma.

Fever or infection and classic respiratory signs like hypoxia, tachypnea, cyanosis, or edema describe manifestations or direct problems, not the primary indirect drivers in the acute trauma context. Headache, nausea, vomiting, and dizziness aren’t primary contributors to respiratory complications in this setting.