Correct Answer: D

Rationale: The correct answer is D because a brain abscess can be caused by direct invasion of the brain, spread of infection by other organs, and spread of infection from nearby sites. Direct invasion occurs when bacteria enter the brain tissue directly, such as through trauma or surgery. Infections from other organs, like the lungs or heart, can spread through the bloodstream to the brain. Infections from nearby sites, such as the ears or sinuses, can also spread to the brain. Therefore, all of these mechanisms can lead to the formation of a brain abscess. Choices A, B, and C individually do not cover all the possible causes of a brain abscess, making D the correct choice.

Correct Answer: D

Rationale: Step 1: Multiple sclerosis (MS) is characterized by damage to the myelin sheath, not a build-up of myelin. Step 2: MS affects the nerves, not neurotransmitters related to muscle contraction (eliminates choice B). Step 3: MS does not damage receptor sites on muscles but affects nerve signal transmission (eliminates choice C). Step 4: The correct answer, D, explains that MS damages the insulation on nerve cells (myelin sheath), leading to slower nerve impulses to the muscles, causing weakness and coordination issues.

Correct Answer: A

Rationale: The correct answer is A because during the first phase of the nursing process (assessment), the nurse gathers a comprehensive database of information about the patient's health status. This includes collecting subjective and objective data to form a baseline for further decision-making. Identifying nursing diagnoses (B) occurs in the second phase (diagnosis), intervening based on priorities of patient care (C) is part of the third phase (planning), and determining outcomes (D) is done in the final phase (evaluation). Therefore, completing a comprehensive database is the most appropriate action in the first phase.

Correct Answer: B

Rationale: The correct answer is B: 2 to 3 weeks. Alopecia is a common adverse reaction to chlorambucil, a type of chemotherapy drug that can cause hair loss. Alopecia typically occurs around 2 to 3 weeks after the first administration of chlorambucil. This is because chemotherapy drugs affect rapidly dividing cells, including hair follicles. Hair loss is a well-known side effect of many chemotherapy drugs, and it is important for the nurse to educate the client about this potential side effect. Incorrect choices: A: Immediately - Hair loss does not occur immediately after the first administration of chlorambucil. C: 1 week - Hair loss typically occurs later than 1 week after starting chemotherapy. D: 1 month - While hair loss can occur within a month, it is more likely to happen sooner, around 2 to 3 weeks after starting the medication.

Correct Answer: D

Rationale: The correct answer is D: 60 seconds. This is because the area must be cleaned for at least 60 seconds to effectively disinfect the skin and reduce the risk of infection during venipuncture. Cleaning for shorter durations (5, 10, or 30 seconds) may not be sufficient to achieve proper disinfection. Thoroughly cleaning the area for a full minute ensures that the alcohol has enough time to kill bacteria and pathogens on the skin, making it safer for the venipuncture procedure. Shorter cleaning times may leave pathogens behind, increasing the risk of contamination and infection.