Final answer:
The 6-year-old child has a heart rate of 100 bpm and a pulse oximeter reading of 99%, indicating adequate tissue perfusion and a normal physiological state post-tonsillectomy.
Step-by-step explanation:
The 6-year-old child who has undergone a tonsillectomy has a heart rate of 100 bpm and a pulse oximeter reading of 99%. These readings indicate adequate tissue perfusion, as the heart rate is within the normal range for a child of this age and the pulse oximetry shows a normal level of oxygen saturation in the blood. A heart rate of 100 bpm is not indicative of heightened cardiac stress or pathology, especially in a post-operative setting where stress and slight elevation in heart rate can be expected. Moreover, a pulse oximeter reading of 99% is excellent and suggests that the child's circulatory and respiratory systems are effectively delivering oxygen to the tissues.