A nurse is admitting a 6-month-old infant who has dehydration. Which of the following amounts of urinary output should indicate to the nurse that the treatment has corrected the fluid imbalance?

Choice A reason: Acidic odors are not a sign of a perforated appendix, but rather a possible indication of gastroesophageal reflux disease (GERD), which is a condition that causes stomach acid to flow back into the esophagus¹.

Choice B reason: Sudden decrease in abdominal pain is a sign of a perforated appendix, which is a serious complication of acute appendicitis. When the appendix ruptures, the pressure inside the abdomen is released, causing a temporary relief of pain. However, this is followed by severe inflammation and infection of the peritoneum, which is the membrane that lines the abdominal cavity². This can lead to sepsis, shock, and death if not treated promptly.

Choice C reason: Narrow fever is not a term that is commonly used in medicine. Fever is a general sign of infection or inflammation, and it can be present in both acute appendicitis and perforated appendix. However, fever alone is not a reliable indicator of the severity or location of the problem³.

Choice D reason: Rigid abdomen is a sign of peritonitis, which is a possible consequence of a perforated appendix. Peritonitis causes the abdominal muscles to contract and become stiff, making the abdomen hard and tender to touch². However, rigidity can also occur in other conditions that cause intra-abdominal inflammation, such as pancreatitis or cholecystitis⁴.

Choice E reason: Nausea is a common symptom of acute appendicitis, but it is not specific to a perforated appendix. Nausea can be caused by irritation of the stomach or the nerves that control vomiting. It can also occur in other gastrointestinal disorders, such as gastritis or gastroenteritis⁵.

Choice A reason: This statement is correct because patent ductus arteriosus is a condition where the ductus arteriosus, a fetal blood vessel that connects the pulmonary artery and the aorta, fails to close after birth. This allows blood to flow from the aorta to the pulmonary artery, increasing the blood flow to the lungs and causing pulmonary hypertension.

Choice B reason: This statement is incorrect because coarctation of the aorta is a condition where the aorta, the main artery that carries blood from the heart to the body, is narrowed. This causes increased pressure in the upper body and decreased pressure in the lower body, reducing the blood flow to the kidneys and other organs.

Choice C reason: This statement is incorrect because tricuspid atresia is a condition where the tricuspid valve, which separates the right atrium and the right ventricle, is missing or abnormally developed. This prevents blood from flowing from the right atrium to the right ventricle, decreasing the blood flow to the lungs and causing cyanosis.

Choice D reason: This statement is incorrect because tetralogy of Fallot is a condition that involves four defects: a large ventricular septal defect, pulmonary stenosis, overriding aorta, and right ventricular hypertrophy. These defects cause blood to bypass the lungs and mix with oxygen-poor blood in the aorta, decreasing the blood flow to the lungs and causing cyanosis.