Your ICD clinic or cardiac nurse should give you a written shock plan before you leave hospital after implantation. This sets out exactly what to do if your device delivers a therapy shock. If you have not received one, ask for it at your next clinic appointment.
In general, if you receive a single shock and feel well immediately afterwards, contact your ICD clinic the same day or the next working day so the episode can be reviewed by downloading your device data. If you receive two or more shocks in quick succession, feel unwell after a shock, or the shock does not resolve your symptoms, call 999 immediately.
If you are unsure what to do in any situation, contact your ICD clinic. Most clinics have a dedicated number for urgent queries during working hours, and you should be given a number to call out of hours.