Correct Answer: D

Rationale: The correct answer is D: Peritonitis. Peritonitis is a major complication of peritoneal dialysis due to infection of the peritoneum. It can lead to serious consequences if not treated promptly. The nurse should monitor for signs of peritonitis such as abdominal pain, cloudy dialysate, fever, and increased white blood cell count. Internal hemorrhage (A), hydronephrosis (B), and ecchymosis (C) are not major complications specific to peritoneal dialysis. Internal hemorrhage can occur but is less common. Hydronephrosis is more related to obstruction of the ureters. Ecchymosis refers to bruising and is not directly associated with peritoneal dialysis.

Correct Answer: C

Rationale: The correct answer is C. This statement warrants clarification as donating blood does not put individuals at risk of getting HIV. Blood donation involves a sterile process that ensures safety. Choice A is correct as using condoms can help prevent the transmission of HIV. Choice B is incorrect because modern blood screening techniques have greatly reduced the risk of HIV transmission through blood transfusions. Choice D is also correct as sharing needles is a high-risk behavior for HIV transmission. In summary, only choice C is incorrect as donating blood does not pose a risk of acquiring HIV.

Correct Answer: D

Rationale: The correct answer is D: Right ventricular hypertrophy. Elevated pulmonary vascular pressures lead to increased resistance in the pulmonary circulation, causing the right ventricle to work harder to pump blood to the lungs. Over time, this can result in hypertrophy of the right ventricle as it adapts to the increased workload. Left atrial atrophy (A) and right atrial atrophy (C) are unlikely as the atria are not directly affected by elevated pulmonary pressures. Left ventricular hypertrophy (B) is not the correct choice as it typically occurs in response to systemic hypertension, not pulmonary hypertension.

Correct Answer: A

Rationale: The correct answer is A: Decreased gastrointestinal motility. This is the defining characteristic because it directly links the cause (pain medication administration) to the effect (constipation). The patient's lack of bowel movement, abdominal distention, and pain are all consequences of decreased gastrointestinal motility. Pain medication slows down the movement of the intestines, leading to constipation. Choices B, C, and D are incorrect because while they are related to the patient's condition, they are not the defining characteristic that connects the cause to the effect in this specific scenario.

Correct Answer: D

Rationale: The correct answer is D: Sigmoidoscopy. This procedure allows direct visualization of the lower colon and rectum, enabling the detection of colorectal cancer. Stool hematest (A) detects blood in the stool but does not confirm cancer. Abdominal CT (B) can show abnormalities but is not specific for colorectal cancer. CEA scan (C) measures a tumor marker but is not definitive for diagnosis. Sigmoidoscopy (D) is the gold standard for diagnosing colorectal cancer as it allows for direct visualization and tissue biopsy.