Final answer:
The irregular, wave pattern described is most likely an example of Fetal Heart Rate Variability, which refers to the fluctuations in the fetal heart rate frequency and amplitude.
Step-by-step explanation:
The irregular, wave pattern described in the question is most likely an example of Fetal Heart Rate Variability. Fetal Heart Rate Variability refers to the fluctuations in the fetal heart rate, both in terms of frequency (cycles per minute) and amplitude (beats per minute). In this case, the frequency ranges from 3-5 cycles per minute and the amplitude ranges from 5-15 beats per minute.
This pattern is different from accelerations, early decelerations, and variable decelerations because those terms typically describe specific changes in the fetal heart rate pattern about contractions during labor.