A nurse in a clinic is assessing a 7-month-old infant. Which of the following indicates a need for further evaluation?

Choice A: Distended neck veins are not a clinical manifestation of pyloric stenosis, which is a condition that causes the narrowing of the pylorus, which is the opening between the stomach and the small intestine. Distended neck veins are a sign of increased venous pressure, which can occur in conditions that affect the right side of the heart or cause fluid overload.

Choice B: Rigid abdomen is not a clinical manifestation of pyloric stenosis, but rather a sign of peritonitis, which is inflammation of the peritoneum, which is the membrane that lines the abdominal cavity. Peritonitis can be caused by infection, perforation, or trauma to any abdominal organ. A rigid abdomen indicates severe pain and inflammation in the abdominal cavity.

Choice C: Projectile vomiting is a clinical manifestation of pyloric stenosis, as it indicates forceful expulsion of stomach contents due to obstruction at the pylorus. Projectile vomiting can occur shortly after feeding and may contain undigested milk or formula. Projectile vomiting can cause dehydration, electrolyte imbalance, or weight loss.

Choice D: Red currant jelly stools are not a clinical manifestation of pyloric stenosis, but rather a sign of intussusception, which is a condition that causes telescoping of one segment of bowel into another. Intussusception can cause obstruction and ischemia of the bowel and lead to bleeding and necrosis. Red currant jelly stools indicate blood and mucus in the stool.

Choice A: A popping sensation when swallowing is not a sign of a tympanic membrane rupture, as it is a normal phenomenon that occurs when the eustachian tube opens and closes to equalize the pressure between the middle ear and the atmosphere. A popping sensation when swallowing may be associated with otitis media with effusion, which is a condition that causes fluid accumulation behind the eardrum, but it does not indicate a rupture.

Choice B: Green-blue discharge could be indicative of infection but is not as directly related to the rupture event as the sudden pain relief is.

Choice C: The correct answer is sudden relief of pain. This is because the rupture of the tympanic membrane releases the pressure and fluid that has built up in the middle ear, leading to an immediate decrease in pain.

Choice D: An increased temperature is not a sign of a tympanic membrane rupture, as it is a nonspecific symptom that may indicate various conditions, such as inflammation, infection, or fever. An increased temperature may be associated with otitis media with effusion, which is a condition that causes fluid accumulation behind the eardrum, but it does not indicate a rupture.