A nurse is assessing a client who has sustained a C4 spinal cord injury. Which assessment finding would indicate a potential need for ventilatory support?

A spinal cord injury at the C4 level can significantly impair respiratory function because it affects the phrenic nerve, which originates from C3–C5 and controls the diaphragm. Damage at or above this level can reduce or eliminate effective diaphragmatic breathing, making ventilatory support potentially necessary. Clients may initially have some spontaneous breathing but are at high risk for rapid respiratory compromise due to weak cough effort and reduced airway clearance. Continuous respiratory assessment is essential to detect early signs of failure. Rationale: A. Decreased sensation in the upper extremities is an expected finding in cervical spinal cord injuries but does not directly indicate respiratory compromise. Sensory deficits reflect neurological involvement but do not determine ventilatory function. The priority concern in C4 injuries is respiratory muscle impairment rather than sensory changes. B. Signs of respiratory distress and inability to control coughing indicate compromised airway protection and reduced ventilatory capacity. Weak or absent cough reflex increases the risk of secretion retention and airway obstruction. In a C4 injury, impaired diaphragmatic and accessory muscle function can rapidly lead to respiratory failure, making ventilatory support necessary. C. Normal full range of motion in the extremities would be unexpected in a C4 spinal cord injury, which typically results in significant motor deficits. However, this finding does not provide information about respiratory status. The primary concern in this context remains breathing adequacy rather than limb movement. D. Normal swallowing and absence of dysphagia are positive findings but do not rule out respiratory compromise in a C4 injury. While swallowing function may remain intact depending on the extent of injury, respiratory muscle impairment can still progress. Ventilatory support decisions are based on breathing effectiveness rather than swallowing ability alone.