Beta-adrenergic agonists such as albuterol are given to Reggie, a child with asthma. Such drugs are administered primarily to do which of the following?

Correct Answer: A

Rationale: Beta-adrenergic agonists like albuterol primarily work by relaxing and dilating the bronchioles, which are the smaller airways in the lungs. This leads to quick relief of asthma symptoms such as wheezing, shortness of breath, and chest tightness. By opening up the airways, these medications help improve airflow and make it easier for the individual to breathe. Beta-adrenergic agonists do not directly reduce airway inflammation, but they do provide immediate relief during an asthma attack by targeting bronchoconstriction.

Correct Answer: D

Rationale: Paranasal sinuses are considered unfavorable sites in rhabdomyosarcoma staging.

Correct Answer: B

Rationale: A 4-month-old infant who is up to date on routine immunizations would not need the Measles, mumps, and rubella (MMR), Varicella, or Haemophilus influenzae type b (HIB) vaccines at this time. These vaccines are typically administered at older ages based on the recommended immunization schedule.

Correct Answer: B

Rationale: In a vaso-occlusive sickle cell crisis, it is crucial to focus on adequate hydration and pain management. Hydration is essential to prevent further sickling of red blood cells, which can exacerbate tissue damage and pain. Pain management is a key aspect of care as vaso-occlusive crises often cause severe pain that requires prompt and effective treatment. Administering heparin is not indicated in a vaso-occlusive sickle cell crisis as it is primarily used for conditions like deep vein thrombosis. Correcting acidosis and replacing factor VIII are also not typically part of the management of a vaso-occlusive sickle cell crisis.

Correct Answer: A

Rationale: Surgical resection is the definitive treatment for cystic hygroma.