If a spinal cord injury is at or above the C5 level, what breathing status is likely?

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When a spinal cord injury occurs at or above the level of the phrenic nerve (C3–C5), the diaphragm—the main muscle of breathing—can be weakened or unusable. The phrenic nerve that drives the diaphragm originates in this region, so an injury here disrupts diaphragmatic function. In addition, intercostal muscles (which help expand the chest) may be affected by a high cervical injury, further limiting ventilation and the ability to cough and clear secretions. Because of these deficits, breathing is not guaranteed to be normal; it may be weakened or lost, and ventilator support may be required to maintain adequate ventilation and gas exchange. The other options imply no respiratory impact or even improved breathing, which doesn’t align with the loss of diaphragmatic and chest-wall function seen with high cervical injuries.