What is diaphragmatic dysfunction from mechanical ventilation and what is a key mitigation strategy?

• A. Pulmonary edema due to high PEEP; mitigated by diuretics
• B. Atelectasis due to shallow breaths; mitigated by incentive spirometry
• C. Ventilator-induced diaphragmatic weakness; mitigated by spontaneous breathing trials and early mobilization
• D. Pneumothorax due to tubing displacement; mitigated by chest tube repositioning

Answer: (C)

Ventilator-induced diaphragmatic weakness comes from the diaphragm being underused when a machine does most of the breathing work. Prolonged controlled ventilation leads to disuse atrophy of the diaphragm, weakening its contractile strength and making weaning from the ventilator harder. The best way to mitigate this is to use spontaneous breathing trials and encourage early mobilization so the patient’s own breathing effort helps keep the diaphragm active and maintains muscle mass, facilitating earlier and smoother weaning. In practice, minimizing sedation to allow spontaneous breaths and applying weaning protocols are key parts of this strategy. The other options describe different ventilator-associated problems (excessive PEEP contributing to fluid shifts, shallow breaths leading to atelectasis, and tube-related pneumothorax) that do not address the issue of preserving diaphragmatic function during ventilation.