A nurse is teaching a new mother about breastfeeding. The nurse determines that the teaching was successful when the woman identifies which hormone as responsible for milk let-down?

A. A score of 7 would be given if the infant’s heart rate was 100, but with less than optimal responses for color, muscle tone, and respiratory effort. However, this baby demonstrates strong responses in all categories.

B. A score of 8would indicate that the baby has no signs of cyanosis and perfect responses in all categories, but since the infant has blue hands, it scores slightly lower (1 point less for color).

C. A score of 5 would indicate more significant distress, with poor color, respiratory effort, and muscle tone. This infant is showing good signs of adaptation.

D. The Apgar score is calculated based on five criteria: heart rate, respiratory effort, muscle tone, reflex irritability, and color. The infant in the scenario has:Heart rate of 100 (score 2)Pink body and blue hands (score 1 for color—because the baby is not fully pink, indicating some cyanosis in the extremities)Active motion (score 2 for muscle tone)Strong lusty cry (score 2 for reflex irritability/responsiveness to stimuli)
Good respirations (score 2)Adding these scores (2 + 1 + 2 + 2 + 2), the total is 9.

A. Difficulty in arousing suggests central nervous system depression, which can be a sign of magnesium toxicity. This is not a therapeutic effect and requires immediate assessment and possible discontinuation of the medication.
B. Deep tendon reflexes 2+ indicates normal neuromuscular function, which is consistent with therapeutic levels of magnesium sulfate. Loss of deep tendon reflexes is often the first sign of magnesium toxicity, so their presence at a normal level is reassuring.
C. Urinary output of 20 mL per hour is below the expected minimum (typically 30 mL/hour) and may suggest impaired renal function, which increases the risk of magnesium accumulation and toxicity.
D. Respiratory rate of 10 breaths/minute is lower than normal and may indicate respiratory depression, a serious sign of magnesium toxicity. A rate below 12 breaths/minute is concerning and not consistent with therapeutic dosing.