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 answer is choice D. Epiglottitis.

Choice A rationale:

Laryngotracheobronchitis (LTB) is a viral infection commonly known as "croup." While it can cause airway inflammation and respiratory distress, it is usually not considered a medical emergency. LTB is characterized by barking cough, stridor, and hoarseness. It typically responds well to supportive care, humidity, and sometimes oral corticosteroids.

Choice B rationale:

Spasmodic croup is another type of viral croup, often triggered by allergies or irritants. It is characterized by sudden onset of symptoms, usually at night, including stridor and a barking cough. While it can be distressing, it is generally not considered a medical emergency. It usually responds to humidity and sometimes oral corticosteroids.

Choice C rationale:

Laryngitis involves inflammation of the larynx and is often caused by viral infections or excessive voice use. While it can lead to hoarseness and voice changes, it does not typically cause severe respiratory distress and is not considered a medical emergency. Resting the voice and staying hydrated are common interventions.

Choice D rationale:

Epiglottitis is a potentially life-threatening condition that causes inflammation of the epiglottis, a flap of tissue that prevents food from entering the windpipe during swallowing. It can rapidly progress to airway obstruction and respiratory failure. Children with epiglottitis often assume a "tripod" position, leaning forward to maintain an open airway. Immediate medical intervention, including securing the airway and administering antibiotics, is crucial.

The correct answer is Choice A.Choice A rationale:Vomiting is a common sign of digoxin toxicity. It occurs due to the drug's effects on the gastrointestinal system, which can lead to nausea and vomiting as the body attempts to expel the toxin. This symptom is particularly significant as it can indicate elevated digoxin levels that may require medical intervention.Choice B rationale:Tachycardia, or an increased heart rate, can occur with digoxin toxicity; however, it is more commonly associated with inadequate therapeutic levels rather than toxicity itself. Digoxin usually causes bradycardia (a slower heart rate) when at therapeutic levels, making tachycardia less indicative of toxicity.Choice C rationale:Bradypnea, or slow breathing, is not a typical sign of digoxin toxicity. While respiratory issues can arise from various conditions, they are not specifically linked to digoxin levels. Monitoring respiratory rate is essential in clinical settings but does not directly correlate with digoxin toxicity.Choice D rationale:Seizures are not a common sign of digoxin toxicity. While severe cases might lead to neurological symptoms due to electrolyte imbalances or other complications, seizures are not typically associated with digoxin overdose. Instead, they may suggest other underlying issues requiring evaluation.