No, they are not recorded. Only the blood pressure and pulse are taken. For the detection of heart rhythm disorders, a 24-hour ECG should be done by the doctor.
If the successive pulse beats differ by more than 20%, the sign irregular heartbeat is displayed. If this symbol appears repeatedly in different measurements, it is recommended to go to the doctor and have an ECG done. This is probably a cardiac arrhythmia. Many of these arrhythmias are harmless; in the case of atrial fibrillation, the doctor will suggest an appropriate measure.