Hello! Welcome and thank you for asking on HCM! I understand your concern and would explain that as long as her Holter monitoring and ECG is normal, there is nothing to worry about! Anxiety can mimic such clinical scenario. These heart rate values are quite normal, in a healthy individual. Anyway, if her complaints persist, I would recommend performing additonal tests to totally exclude any cardiac issues: - a cardiac ultrasound - cardiac enzyme levels (Troponin, CK-MB) - an exercise cardiac stress test. If all these tests result normal, you should consider anxiety as the main cause of your daughter complaints. Hope you will find this answer helpful! Wishing good health, Dr. Iliri