You can use the ECG app on your Apple Watch to monitor your heart rate and detect irregularities, in which case you should notify your doctor.

As an academic cardiologist, I take a deep, evidence-based look at the Apple Watch’s ECG function. Is it just a cool feature, or can it actually detect life-threatening conditions and improve outcomes ...

Medicare typically covers a Holter monitor for between 48 hours and 7 days when medically necessary. You must have a qualifying symptom, such as arrhythmia, chest pain, loss of consciousness, heart ...