Following admission for a cardiac catheterization, the nurse is providing discharge teaching to the parents of a 2-year-old toddler with Tetralogy of Fallot. Which instruction should the nurse give the parents if their child becomes pale, cool, and lethargic?

Encourage oral electrolyte solution intake.

Contact their healthcare provider immediately.

Provide a quiet time by holding or rocking the toddler.

Assist the child to a recumbent position.

Answer and Explanation

The Correct Answer is B

Choice A reason: Electrolyte solutions address dehydration but are inappropriate for pale, cool, lethargic symptoms in Tetralogy of Fallot (TOF), indicating a hypercyanotic spell from right-to-left shunting. Urgent medical intervention restores oxygenation, making this inadequate compared to addressing the critical hypoxic episode requiring provider attention.

Choice B reason: Pale, cool, lethargy in TOF signals a hypercyanotic spell, where pulmonary stenosis increases right-to-left shunting, causing cyanosis and hypoxia. Contacting the provider ensures rapid interventions (e.g., oxygen, beta-blockers), preventing cerebral hypoxia or cardiac arrest, addressing the urgent pathophysiological crisis effectively.

Choice C reason: Quiet time by holding or rocking may calm the toddler but does not treat hypoxic spells in TOF, where pale, cool symptoms indicate shunting and hypoxia. Delaying medical intervention risks severe hypoxia, making this less critical than contacting the provider for urgent management.

Choice D reason: A recumbent position worsens TOF’s hypercyanotic spell, increasing venous return and shunting, exacerbating hypoxia. Knee-chest positioning reduces shunting. Contacting the provider is urgent to address pale, cool, lethargic symptoms, ensuring interventions to restore oxygenation, making this position contraindicated.

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Correct Answer is C

Explanation

Choice A reason: Dry skin and inelastic turgor reflect dehydration in DI from antidiuretic hormone deficiency, causing water loss. This is less urgent than hypernatremia (185 mEq/L), which dehydrates brain cells, risking seizures or coma, requiring immediate fluid correction to prevent neurological damage in this critical condition.

Choice B reason: Tachycardia (110 beats/minute) compensates for hypovolemia in DI, where water loss reduces preload, triggering sympathetic activation. This is less critical than hypernatremia (185 mEq/L), which causes cerebral dehydration, necessitating urgent hypotonic fluids to prevent neurological complications, making heart rate secondary.

Choice C reason: Serum sodium of 185 mEq/L indicates severe hypernatremia in DI, where water loss concentrates sodium, dehydrating neurons and risking seizures or coma. Immediate IV hypotonic fluids (e.g., 5% dextrose) correct osmolarity, preventing life-threatening cerebral complications, addressing the urgent pathophysiological crisis in DI.

Choice D reason: Polyuria and thirst are hallmark DI symptoms from water loss but expected and less urgent than hypernatremia (185 mEq/L), which threatens neurological function via osmotic brain injury. Correcting sodium is critical to prevent seizures, making these symptoms secondary to urgent electrolyte management.

A. Blood pressure is 142/88 mm Hg. B. 2+ edema of fingers and hands. C. Radial pulse volume is 3+. D. Capillary refill time is 2 seconds.

Correct Answer is B

Explanation

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.

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Following admission for a cardiac catheterization, the nurse is providing discharge teaching to the parents of a 2-year-old toddler with Tetralogy of Fallot. Which instruction should the nurse give the parents if their child becomes pale, cool, and lethargic?

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Following admission for a cardiac catheterization, the nurse is providing discharge teaching to the parents of a 2-year-old toddler with Tetralogy of Fallot. Which instruction should the nurse give the parents if their child becomes pale, cool, and lethargic?