Correct Answer: B

Rationale: In a situation where a client has no pulse or respirations, the initial action recommended by the American Heart Association is to start high-quality chest compressions. This action helps maintain blood flow to vital organs such as the brain until normal heart rhythm is restored. Starting CPR with chest compressions before checking the airway and providing rescue breaths is crucial to improve outcomes. While establishing an airway and obtaining a crash cart are important steps in resuscitation, initiating chest compressions takes precedence to ensure oxygenated blood circulation. Starting with chest compressions applies to adults, children, and infants but not newborns.

Correct Answer: D

Rationale: A platelet count of 25,000/microliter indicates severe thrombocytopenia, which increases the risk of bleeding. It is crucial to initiate bleeding precautions, including regularly checking for signs of bleeding such as examining urine and stool for blood. Monitoring for fever every 4 hours (Choice A) should be included for neutropenic precautions, not specifically related to platelet count. Requiring visitors to wear respiratory masks and protective clothing (Choice B) is more relevant for patients with airborne precautions. Considering transfusion of packed red blood cells (Choice C) is not indicated for low platelet count but is more appropriate for managing anemia or low hemoglobin levels.

Correct Answer: A

Rationale: The correct answer is bowel perforation. Bowel perforation is the most serious complication of fiberoptic colonoscopy, with signs such as progressive abdominal pain, fever, chills, and tachycardia indicating advancing peritonitis. Although colonoscopic perforation is rare (0.03% to 0.7% incidence), it can lead to high mortality and morbidity rates. Viral gastroenteritis (Choice B) typically presents with symptoms like diarrhea, nausea, vomiting, and abdominal cramps, but it is not the most immediate concern in this scenario. Colon cancer (Choice C) and diverticulitis (Choice D) are important conditions but are less likely to present acutely after colonoscopy compared to bowel perforation.

Correct Answer: C

Rationale: When administering medications to infants, it is common to use the vastus lateralis muscle in the thigh for injections. The preferred site is the junction of the upper and middle thirds of the vastus lateralis muscle. This area provides a good muscle mass for the injection and minimizes the risk of hitting nerves or blood vessels. The gluteus maximus and gluteus minimus are not typically used for infant injections due to the risk of injury to the sciatic nerve. The vastus medialis is not as commonly used as the vastus lateralis for infant injections.

Correct Answer: B

Rationale: The correct answer is Hypercalcemia. In this case, the patient's history of myeloma, constipation, intense abdominal pain, and polyuria suggests hypercalcemia. Elevated calcium levels can lead to polyuria, severe abdominal pain, and confusion. Diverticulosis (Choice A), characterized by small pouches in the colon wall, typically does not present with confusion and polyuria. Hypocalcemia (Choice C) is unlikely given the symptoms described. Irritable bowel syndrome (Choice D) does not typically cause confusion and polyuria as seen in hypercalcemia.