AICD Generator Replacement: Timing, Indications & Process

An AICD (Automatic Implantable Cardioverter‑Defibrillator) generator typically lasts 5–10 years depending on battery capacity, therapy delivery frequency, and device model.

Replacement Indications

• Elective Replacement Indicator (ERI): Battery voltage reaches manufacturer‑defined threshold; ~3–6 months remaining longevity.
• Device malfunction: Lead fracture, insulation breach, circuit failure (rare).
• Clinical upgrade: Newer algorithms (e.g., ATP, MRI‑conditional), remote monitoring capability.
• Infection/erosion: Requires full system explant + reimplant.

Typical Timeline

1. Routine device interrogation (in‑office or remote) detects ERI.
2. Electrophysiologist schedules replacement (outpatient, 1–2 hours, conscious sedation).
3. Old generator disconnected; leads tested; new generator connected.
4. Post‑procedure device check; activity restrictions ~1 week.

Patient Factors Influencing Timing

• Comorbidities (anticoagulation hold, infection risk).
• Lead integrity (if leads near end‑of‑service, may replace simultaneously).
• Patient preference/travel logistics.

Key Point

No urgency unless ERI is reached or malfunction occurs. Routine follow‑up (every 3–6 months) ensures timely elective replacement.