Correct Answer: C

Rationale: To evaluate the effectiveness of atorvastatin (Lipitor), the nurse should monitor liver function tests (LFTs) (C) because this medication can impact liver function. Complete blood count (CBC) (A), serum potassium level (B), and serum cholesterol level (D) are not directly indicative of the medication's effectiveness in managing coronary artery disease.

Correct Answer: C

Rationale: Pinching the skin before inserting the needle is essential in elevating the subcutaneous tissue away from the muscle. This technique ensures that the medication is administered into the correct tissue layer, promoting proper absorption and decreasing the risk of injecting into muscle tissue.

Correct Answer: B

Rationale: If a sterile field becomes wet or damp during a procedure, it is considered contaminated as moisture can allow organisms to wick from the surface and compromise the sterility of the field. It is essential to maintain the integrity of the sterile field to prevent infections and ensure patient safety.

Correct Answer: D

Rationale: In response to the mother's report, the nurse should assess the family's home environment first to identify any factors that may hinder the establishment of bedtime routines conducive to sleep. Factors such as noise, light, distractions, or other environmental aspects could be contributing to the child's difficulty falling asleep at a reasonable hour and waking up in the morning.

Correct Answer: C

Rationale: In right-sided heart failure, the heart's inability to effectively pump blood to the lungs leads to fluid backup in the systemic circulation, resulting in peripheral edema (swelling in lower extremities). While jugular vein distention (A) and hepatomegaly (D) can also occur in right-sided heart failure, peripheral edema is a hallmark sign due to fluid retention. Crackles in the lungs (B) are more commonly associated with left-sided heart failure, where fluid accumulates in the lungs.