The recommended children's dosage of Keflex is 25 to 50 mg/kg/day in divided doses. The maximum daily safe dosage for a child weighing 42 lb is: Round to the nearest tenth.

(Number Only, do not enter mg, kg, or day with your answer)

The correct answers are choices A, B, and D.

Choice A rationale:

Decreased urinary output can be a sign of heart failure, especially in infants. In heart failure, the heart's ability to pump effectively can lead to decreased blood flow to the kidneys, resulting in decreased urine production.

Choice B rationale:

Sweating (inappropriate) is a symptom of heart failure in infants. Infants with heart failure might sweat excessively, especially while feeding or crying, due to the effort required by the heart to pump blood effectively.

Choice C rationale:

Warm flushed extremities are not typically associated with heart failure in infants. In heart failure, extremities might actually become cool and pale due to poor circulation.

Choice D rationale:

Anorexia, or a lack of appetite, is a common sign in infants with heart failure. The increased effort required for feeding due to compromised cardiac function can lead to poor feeding and decreased appetite.

Choice E rationale:

Weight loss can occur in infants with heart failure due to inadequate caloric intake, difficulty with feeding, and increased metabolic demands associated with heart failure. However, it's not as specific a sign as decreased urinary output, sweating, and anorexia.

Choice A rationale:

Hypoparathyroidism is not associated with exophthalmos. Hypoparathyroidism is a condition where the parathyroid glands produce insufficient parathyroid hormone, leading to low calcium levels in the blood. This condition doesn't directly affect the thyroid gland or cause exophthalmos.

Choice B rationale:

Exophthalmos, also known as protruding or bulging eyes, is a classic symptom of hyperthyroidism. Hyperthyroidism is a condition where the thyroid gland produces excessive amounts of thyroid hormones. These elevated hormone levels can lead to a variety of symptoms, including increased metabolism, weight loss, nervousness, and protruding eyes due to inflammation of the eye muscles and tissues behind the eye.

Choice C rationale:

Hyperparathyroidism involves the overactivity of the parathyroid glands, leading to excessive production of parathyroid hormone (PTH) and elevated calcium levels in the blood. While elevated calcium levels can have various effects on the body, exophthalmos is not a typical manifestation of hyperparathyroidism. The condition is more commonly associated with bone and kidney issues.

Choice D rationale:

Hypothyroidism, the underproduction of thyroid hormones by the thyroid gland, is not linked to exophthalmos. Instead, hypothyroidism is known for causing symptoms such as fatigue, weight gain, cold intolerance, and slow heart rate. Exophthalmos is a characteristic sign of hyperthyroidism, not hypothyroidism.