A nurse is caring for a toddler whose parent states that while bathing the child, she noticed a mass in his abdominal area and that his urine is a pink color. Which of the following actions is the nurse's priority?

Choice A reason: Assessing the client's erythematous rash is an important action for the nurse to take, but it is not the priority. The rash is one of the minor criteria for diagnosing acute rheumatic fever, and it may not be present in all cases. The rash is usually non-pruritic and migratory, and it appears on the trunk and extremities.

Choice B reason: Identifying the degree of parental anxiety related to the diagnosis is an appropriate action for the nurse to take, but it is not the priority. The nurse should provide emotional support and education to the parents, and address their concerns and questions. However, this is not the most urgent action.

Choice C reason: Auscultating the rate and characteristics of the child's heart sounds is the priority action for the nurse to take, as it can detect the presence and severity of carditis, which is the most serious complication of acute rheumatic fever. Carditis is the inflammation of the heart muscle, valves, or pericardium, and it can cause murmurs, tachycardia, dysrhythmias, heart failure, or death.

Choice D reason: Using a pain-rating tool to determine the severity of the joint pain is an important action for the nurse to take, but it is not the priority. The joint pain is one of the major criteria for diagnosing acute rheumatic fever, and it is usually severe and migratory, affecting the large joints such as the knees, ankles, elbows, or wrists. The nurse should assess the pain level and provide analgesics and anti-inflammatory medications as prescribed.

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.