Correct Answer: D

Rationale: The priority nursing diagnosis for a newborn with esophageal atresia and tracheoesophageal fistula is 'Risk for Aspiration' because of the potential respiratory complications associated with these conditions. The newborn is at a higher risk of aspirating oral or gastric contents due to the abnormal connections between the esophagus and trachea, posing a serious threat to the airway and lungs. Addressing this risk is crucial to prevent respiratory distress and maintain the airway's patency, making it the priority nursing diagnosis in this scenario.

Correct Answer: A

Rationale: The correct answer is A. The posterior fontanel should be closed by 4 months of age. An open posterior fontanel at this age may indicate a delay in normal closure, which could be a cause for concern and require further evaluation by the healthcare provider to ensure proper development and growth.

Correct Answer: D

Rationale: The correct answer is D: BP of 70/50. When sildenafil (Viagra) is taken with nitroglycerin, it can cause severe hypotension that is unresponsive to treatment. The combination of these medications can lead to a dangerous drop in blood pressure. It is crucial to immediately report hypotension in this scenario. It is recommended to allow at least 24 hours to elapse between the last dose of sildenafil and nitroglycerin to prevent such adverse effects. The other vital signs and lab values may be abnormal but do not have the immediate life-threatening implications that severe hypotension does in this context.

Correct Answer: C

Rationale: Rectal temperatures are contraindicated in a toddler with a colostomy due to the risk of injury.

Correct Answer: B

Rationale: The correct action for the nurse when preparing an adolescent for a lumbar puncture is to apply a topical analgesic cream to the site one hour before the procedure. This helps reduce pain experienced during the lumbar puncture, making the procedure more comfortable for the adolescent.