The nurse is performing screening assessments of adolescents for scoliosis. When performing the assessment, which instruction should the nurse provide?

Choice A rationale

Assessing the infant's response to auditory stimuli is a component of a comprehensive neurological examination. However, the absence of a primitive reflex, such as the Moro reflex, which should be present at this age, is a significant abnormal finding indicative of a potential neurological deficit. Therefore, this action is a secondary step after addressing the primary concern.

Choice B rationale

The absence of the Moro reflex in a 1-month-old infant is a critical finding that suggests a potential neurological impairment, possibly affecting the central nervous system or musculoskeletal system. Normal Moro reflex should be present from birth until around 3 to 4 months of age. Prompt notification of the healthcare provider is necessary to ensure a timely and thorough evaluation of the infant's neurological status.

Choice C rationale

Documentation is a crucial part of nursing practice, but it is not the first intervention. The nurse must first act on the abnormal finding to ensure the safety and well-being of the infant. The priority is to communicate the significant assessment finding to the healthcare provider so a plan of care can be established.

Choice D rationale

While patient education is important, simply telling the mother that a further assessment is needed does not constitute a primary intervention. The nurse's immediate responsibility is to address the clinical finding with the medical team. The healthcare provider will then order the necessary diagnostic tests and treatments, and the nurse can provide education.

Rationale for correct conditionThe client presents with classic signs of magnesium sulfate toxicity: absent DTRs, respiratory rate of 10 breaths/min, and decreased consciousness. Normal DTRs should be 2+; absence indicates neuromuscular depression. Magnesium impairs acetylcholine release, affecting neuromuscular and respiratory systems. A normal serum magnesium level is 1.7–2.2 mg/dL; toxicity often occurs above 7 mg/dL. Urine output <30 mL/hour also suggests impaired renal clearance.

Rationale for correct actionsStopping the infusion halts further accumulation of magnesium, preventing progression to respiratory arrest or cardiac dysfunction. Magnesium is eliminated renally; continued infusion worsens toxicity. Calcium gluconate is the antidote to magnesium toxicity because it competitively antagonizes magnesium’s action at neuromuscular junctions, restoring muscle tone and respiration. Calcium stabilizes cardiac membrane potentials affected by excess magnesium.

Rationale for correct parametersSerum magnesium level directly confirms toxic accumulation above the therapeutic range. Monitoring provides a quantifiable measure to guide treatment. DTRs reflect central and peripheral neuromuscular function; their absence signals excessive magnesium levels impairing synaptic transmission.

Rationale for incorrect conditionsWorsening preeclampsia causes elevated blood pressure and hyperreflexia, not hypotension or absent DTRs. Pulmonary edema exacerbation presents with crackles and hypoxia, but does not explain CNS depression or bradypnea. Hypotension secondary to medication would not cause absent DTRs or respiratory depression unless cardiac output is critically impaired.

Rationale for incorrect actionsIncreasing oxygen does not reverse magnesium toxicity’s neuromuscular depression. Notifying the provider is necessary but insufficient alone. Initiating seizure precautions addresses eclampsia risk, not magnesium toxicity symptoms.

Rationale for incorrect parametersRespiratory rate alone doesn't quantify magnesium status. Urine output indicates renal function but not magnesium level directly. Blood pressure trends aren’t reliable indicators of magnesium toxicity progression.

Take-home points• Magnesium sulfate toxicity presents with bradypnea, absent DTRs, and CNS depression. • Calcium gluconate is the physiological antidote via calcium channel antagonism. • Serum magnesium levels and DTRs are the most sensitive indicators of toxicity. • Differentiation from worsening preeclampsia is vital to prevent mismanagement.