What is the primary purpose of prescribing a histamine receptor antagonist for an infant diagnosed with gastroesophageal reflux?

The correct answers are choices A, C, and D: Tachycardia, Hyperthermia, and Vomiting.

Choice A rationale:

Tachycardia. Tachycardia, an abnormally fast heart rate, is a classic manifestation of thyroid storm. In this life-threatening condition, there is an excessive release of thyroid hormones, leading to increased metabolic rate and subsequent cardiovascular effects such as tachycardia.

Choice B rationale:

Constipation. This choice is incorrect for thyroid storm. Hyperthyroidism typically leads to increased bowel motility and can cause diarrhea rather than constipation.

Choice C rationale:

Hyperthermia. This is a correct choice. Thyroid storm is associated with severe hyperthermia due to the increased metabolic rate caused by excessive thyroid hormones. The body's temperature regulation is disrupted, leading to dangerously high body temperatures.

Choice D rationale:

Vomiting. This is a correct choice. Gastrointestinal symptoms, including vomiting and nausea, can occur in thyroid storm due to the heightened metabolic state. Thyroid storm affects various systems, including the gastrointestinal system, leading to symptoms like vomiting.

Choice E rationale:

Hypotension. This choice is incorrect for thyroid storm. Thyroid storm is more likely to cause hypertension rather than hypotension due to the increased cardiac output and sympathetic stimulation.

The correct answer is choice A. Meconium ileus.

Choice A rationale:

Meconium ileus. This is the earliest recognizable clinical manifestation of cystic fibrosis (CF). Meconium ileus refers to the blockage of the small intestine by thick, sticky meconium, the earliest stool of a newborn. It occurs in the first 24-48 hours of life and can be a sign of underlying cystic fibrosis.

Choice B rationale:

Foul-smelling, frothy, greasy stools. Foul-smelling, frothy, greasy stools are characteristic of malabsorption, which can occur in cystic fibrosis. However, this manifestation typically appears after meconium ileus and is not the earliest recognizable clinical sign.

Choice C rationale:

History of poor intestinal absorption. While poor intestinal absorption is a common consequence of cystic fibrosis, it is not one of the earliest recognizable clinical manifestations. Meconium ileus takes precedence as the primary early sign.

Choice D rationale:

Recurrent pneumonia and lung infections. Recurrent pneumonia and lung infections are common in later stages of cystic fibrosis due to the buildup of thick mucus in the respiratory tract. However, they are not among the earliest recognizable clinical manifestations of the disease. Meconium ileus is the earliest indicator in this context.