The primary health care provider prescribes pulse assessments through the night for a 12-year-old child with rheumatic fever who has a daytime heart rate of 120. The nurse explains to the mother that...

The primary health care provider prescribes pulse assessments through the night for a 12-year-old child with rheumatic fever who has a daytime heart rate of 120. The nurse explains to the mother that this is to evaluate if the elevated heart rate is caused by:

1. The morning digitalis.

2. Normal activity during waking hours.

3. A warmer daytime environment.

4. Normal variations in day and evening hours.