Final answer:
A heart rate of 100 bpm and a pulse oximeter reading of 99% in a 6-year-old child post tonsillectomy indicates adequate tissue perfusion.
Step-by-step explanation:
The question is asking what the heart rate of 100 bpm and the pulse oximeter reading of 99% indicate for a 6-year-old child who has just had a tonsillectomy. In this scenario, the child's heart rate is within the normal range for a pediatric patient, which usually ranges from 70-120 bpm depending on activity and stress levels. Additionally, a pulse oximeter reading of 99% reflects that the child's hemoglobin is almost fully saturated with oxygen, suggestive of a healthy oxygen exchange in the lungs and an efficient circulation system, indicating adequate tissue perfusion. Hence, the correct answer is d. Adequate tissue perfusion.