thanks for writing to HC magic
since you have not mentioned your actual medical diagnosis
which formed the reason for ICD (defibrillator ) to be implanted, it is not feasible to state that what will be the future but in all probability once carefully implanted for valid indications, it is likely to remain there life long. because it is not advisable to implant an ICD for a reversible transient condition.
if you can come up with your primary medical diagnosis, i will throw more light on this.