yousef is 18 months old, you counsel his mother that the best procedure to follow, if her child swallows something poisonous first to:

Correct Answer: A

Rationale: The best procedure to follow if a child swallows something poisonous is to telephone the local poison control center. The experts at the poison control center can provide immediate guidance on how to handle the situation based on the specific substance ingested and the child's age and weight. They will advise whether it is necessary to bring the child to the emergency room, induce vomiting, or take other appropriate actions. Providing milk to drink to induce vomiting is not recommended as it can lead to further complications. Identifying the substance the child swallowed is important, but the first step should be to contact the poison control center for immediate assistance.

Correct Answer: A

Rationale: The sympathetic nervous system is responsible for our "fight or flight" response to stressful situations. Norepinephrine is the primary neurotransmitter that mediates the sympathetic response, acting on adrenergic receptors in various target tissues. It helps to increase heart rate, elevate blood pressure, dilate air passages in the lungs, and mobilize energy stores in the body to prepare for physical exertion or stress. Acetylcholine is another neurotransmitter involved in the sympathetic nervous system, but norepinephrine is the primary mediator of the fight or flight response.

Correct Answer: A

Rationale: Acyclovir is an antiviral effective against herpes simplex virus (HSV) infections, including encephalitis and mucocutaneous lesions.

Correct Answer: B

Rationale: After a litholapaxy surgery for bladder stones, it is common for the urethral catheter to remain in place for 1-2 days. This timeframe allows for adequate drainage and healing of the bladder following the procedure. The healthcare team will monitor the patient's progress and determine the appropriate timing for catheter removal based on individual factors such as the size of the stones removed and the patient's overall condition. Early removal of the catheter may increase the risk of complications, while leaving it in place for too long may also lead to problems such as infection. Therefore, the recommended duration of 1-2 days strikes a balance between allowing for proper healing and minimizing potential issues related to catheterization.

Correct Answer: C

Rationale: Omalizumab should be discontinued if no improvement is seen within 4-6 weeks.