At 0800, the practical nurse (PN) reports to the registered nurse (RN) that a client’s blood pressure is 140/90 mm Hg. When the RN arrives to administer the 0900 antihypertensive medication, the client is oriented but lethargic, pale, and diaphoretic. Which action should the RN implement first?

Choice A reason: Monitoring airway and tongue during a tonic-clonic seizure is critical, as muscle contractions can obstruct the airway or cause tongue biting, leading to hypoxia. Ensuring airway patency prevents respiratory compromise, a life-threatening issue, addressing the physiological priority of oxygenation during seizure-induced neuronal hyperactivity.

Choice B reason: Darkening the room by closing blinds is not a priority during a seizure. Reducing stimuli may help photosensitive epilepsy, but active seizures require airway and safety management. Uncontrolled movements from neuronal discharges pose immediate risks, making airway monitoring and injury prevention more critical than environmental adjustments.

Choice C reason: Placing pillows inside side rails protects the child from trauma during a seizure, as tonic-clonic movements from cortical hyperexcitability risk fractures or head injuries. Padding reduces impact injuries, addressing the physiological need for safety during clonic jerking, ensuring protection against environmental hazards in the seizure setting.

Choice D reason: Asking the mother to release the child prevents harm, as restraint during a seizure can cause fractures or muscle strain by resisting neuronal-driven movements. Allowing free movement in a safe environment reduces injury risk, prioritizing physical safety and preventing complications from external resistance during the seizure.

Choice E reason: Administering an anticonvulsant requires a prescription and is not immediate during an active seizure. While drugs like lorazepam treat prolonged seizures, the nurse prioritizes airway and safety. Only trained personnel with orders can administer medications, making this less urgent than ensuring airway patency and injury prevention.

Choice A reason: Blood pressure of 142/88 mm Hg indicates mild hypertension but does not directly affect pulse oximetry, which measures arterial oxygen saturation via hemoglobin light absorption. Hypertension does not typically cause hypoxemia (91% SpO₂). Edema is more likely, as it disrupts sensor accuracy, leading to false low readings.

Choice B reason: 2+ edema in fingers and hands impairs pulse oximeter accuracy, as fluid in tissues scatters light, reducing the sensor’s ability to detect arterial hemoglobin saturation. This causes falsely low SpO₂ readings (91%), common in edema from heart failure, making it the primary contributor to the inaccurate measurement.

Choice C reason: A radial pulse volume of 3+ indicates strong arterial flow, supporting accurate pulse oximetry by ensuring perfusion. This does not explain a low SpO₂ of 91%, as strong pulses enhance sensor reliability. Edema’s interference with light transmission is more likely to cause the reduced reading.

Choice D reason: Capillary refill of 2 seconds is normal, indicating adequate perfusion. This does not contribute to a low SpO₂ (91%), as pulse oximetry measures arterial flow, not capillary dynamics. Edema disrupts light transmission, causing inaccurate readings, making it the most likely cause of the observed saturation.