Medical Surgical HESI

Correct Answer: A

Rationale: The correct answer is A: 'There is an extra chromosome on the 21st pair.' Down syndrome is caused by the presence of an extra copy of chromosome 21, known as trisomy 21. This additional genetic material leads to the characteristics associated with Down syndrome. Choices B, C, and D are incorrect because Down syndrome is not due to a missing chromosome or having two pairs of the 21st chromosome; it results from the presence of an extra chromosome on the 21st pair.

Correct Answer: C

Rationale: The correct answer is C: Cries vigorously. When the child cries vigorously, it increases the pressure in the right ventricle, allowing unoxygenated blood to enter the circulating volume, leading to cyanosis. This occurs due to the shunting of blood from the right side of the heart to the left side through the ventricular septal defect. Choices A, B, and D are incorrect because they do not directly impact the pressure in the right ventricle, which is crucial in causing cyanosis in this scenario.

Correct Answer: B

Rationale: The correct answer is B: Oranges. Oranges are not a rich source of iron. Iron-rich foods include liver, leafy green vegetables, and kidney beans. Oranges are a good source of vitamin C but are not high in iron. Therefore, if the client selects oranges as an iron-rich food, it indicates a need for additional instructions on choosing foods high in iron.

Correct Answer: B

Rationale: The correct early sign of varicella disease is general malaise. During the prodromal period, patients may experience low-grade fever, malaise, and anorexia. Increased appetite and crusty sores are not typically early signs of varicella. The appearance of lesions occurs later in the course of the disease.

Correct Answer: D

Rationale: The correct answer is D, supine. The American Academy of Pediatrics recommends placing infants on their back, or supine, to sleep as it has been shown to reduce the risk of SIDS. Choices A, B, and C are incorrect because placing infants on their right side, left side, or prone (on their stomach) respectively are not recommended sleeping positions due to the increased risk of SIDS associated with those positions.