Final answer:
A pulse rate of 55 beats per minute in a 10-year-old client is an unexpected finding, as it may suggest bradycardia, which is unusual for this age group with the normal range being 70 to 100 bpm.
Step-by-step explanation:
The nurse would recognize a pulse rate of 55 in a 10-year-old client as an unexpected finding. Typically, the normal resting heart rate for children aged 6 to 15 years old is between 70 to 100 beats per minute (bpm). The pulse rate of 55 bpm in a 10-year-old client may suggest bradycardia, which is a condition where the heart rate is slower than normal. While adults can have a lower resting heart rate, often seen in well-trained athletes, such low heart rates in children may require further evaluation for potential underlying conditions or issues.