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 C. Dyspnea.

Choice A rationale:

Orthopnea. Orthopnea refers to difficulty in breathing that occurs when lying flat. It is not the term used to describe labored breathing, which is the main concern in this question.

Choice B rationale:

Hypopnea. Hypopnea is a term used to describe shallow or slow breathing, usually during sleep. It is not the term used to describe the labored breathing mentioned in the question.

Choice C rationale:

Dyspnea. This is the correct term to describe labored breathing, which is characterized by a subjective sensation of discomfort or difficulty in breathing. In this context, the nurse is charting that the hospitalized child has labored breathing, indicating the need for further assessment and intervention to address this breathing difficulty.

Choice D rationale:

Tachypnea. Tachypnea refers to abnormally fast breathing. While it is a concern, especially in the context of a hospitalized child, it does not specifically describe labored breathing, which is the main focus of this question.

Step 1 is converting the child's weight from pounds to kilograms. (42 lb ÷ 2.2) = 19.09090909 kg

Step 2 is calculating the maximum daily dosage using the upper limit of the dosage range (50 mg/kg/day). 19.09090909 kg × 50 mg/kg/day = 954.5454545 mg/day

Step 3 is rounding the result to the nearest tenth. The answer is 954.5