A nurse is caring for a toddler who has acute laryngotracheobronchitis and has been placed in a cool mist tent. Which of the following findings should indicate to the nurse that the treatment is effective?

Choice A reason: Hypertrophic pyloric stenosis is a condition in which the pyloric sphincter becomes thickened and obstructs the passage of food from the stomach to the duodenum. It causes projectile vomiting, dehydration, and weight loss, but not a palpable mass or bloody stools.

Choice B reason: Intussusception is a condition in which a segment of the intestine telescopes into another segment, causing obstruction, inflammation, and ischemia. It causes a palpable mass in the upper right quadrant, abdominal pain, and stools mixed with blood and mucus, also known as "currant jelly" stools.

Choice C reason: Inguinal hernia is a condition in which a part of the intestine protrudes through a weak spot in the abdominal wall near the inguinal canal. It causes a bulge in the groin area, especially when the infant cries or strains. It does not cause a mass in the upper right quadrant or bloody stools.

Choice D reason: Tracheoesophageal fistula is a congenital anomaly in which there is an abnormal connection between the trachea and the esophagus. It causes excessive drooling, choking, coughing, and cyanosis during feeding, but not a palpable mass or bloody stools.

Choice A reason: The child has signs of dehydration and hypovolemic shock, such as vomiting, melena, abdominal pain, and weak pedal pulses. Dehydration is a loss of fluid and electrolytes from the body, which can result from gastroenteritis. Hypovolemic shock is a life-threatening condition that occurs when the blood volume is too low to maintain adequate perfusion and oxygen delivery to the vital organs.

Choice B reason: The child does not have signs of peritonitis and septic shock, such as fever, chills, rigors, tachycardia, hypotension, and abdominal rigidity. Peritonitis is an inflammation of the peritoneum, the membrane that lines the abdominal cavity and organs. Septic shock is a severe infection that causes systemic inflammatory response syndrome and organ dysfunction.

Choice C reason: The child does not have signs of pancreatitis and cardiogenic shock, such as elevated serum amylase and lipase, jaundice, dyspnea, crackles, and chest pain. Pancreatitis is an inflammation of the pancreas, an organ that produces digestive enzymes and hormones. Cardiogenic shock is a failure of the heart to pump enough blood to meet the body's needs.

Choice D reason: The child does not have signs of peptic ulcer and anaphylactic shock, such as hematemesis, dyspepsia, urticaria, angioedema, and wheezes. Peptic ulcer is a sore in the lining of the stomach or duodenum, caused by factors such as Helicobacter pylori infection, NSAIDs, or stress. Anaphylactic shock is a severe allergic reaction that causes bronchoconstriction, vasodilation, and hypotension.