Pacemakers and ICDs: Living a Full Life With a Device in Your Chest

Cardiology · 4 · March 10, 2026

A doctor just told you — or someone you love — that you need a pacemaker or an ICD. Your mind races. Will I feel it? Can I still exercise? What about airport security? MRI scans? Will it go off randomly? These are normal fears. And for almost every one of them, the answer is reassuring. About 1.5 million pacemakers and 300,000 ICDs are implanted globally each year. The vast majority of recipients return to full, active lives.

Pacemaker vs. ICD: What's the Difference?

A pacemaker treats slow heart rhythms (bradycardia). If your heart rate drops too low — due to sick sinus syndrome, AV block, or other conduction disorders — the pacemaker delivers small electrical impulses to keep the heart beating at an appropriate rate. You don't feel these impulses. They're tiny. The device monitors continuously and only paces when needed.

An ICD does everything a pacemaker does, plus it can detect and treat life-threatening fast rhythms — ventricular tachycardia and ventricular fibrillation. If your heart suddenly goes into a dangerous rhythm, the ICD delivers a shock to restore normal rhythm. Think of it as a personal defibrillator sitting inside your chest. You feel the shock. Patients describe it as a sudden thump or kick. It's startling but it's saving your life.

The Implant Procedure

Both devices are implanted under local anesthesia with sedation. A small incision (about 2 inches) is made below the collarbone. Leads (thin wires) are threaded through a vein into the heart chambers and connected to the generator — a titanium case about the size of a small matchbox. The generator sits in a pocket under the skin, usually on the left side.

The procedure takes 1-3 hours. Most patients go home the same day or the next morning. The incision site will be sore for a week or two. You'll keep the arm on the implant side below shoulder level for 4-6 weeks to let the leads settle into position. After that, full range of motion returns.

Daily Life With a Device

Exercise: Most activities are fine after the healing period. Walking, cycling, swimming, golf, yoga — all good. Contact sports where a blow to the chest is likely (boxing, football) are generally discouraged because of lead dislodgement risk. The ESC's 2024 guidelines for athletes with cardiac devices note that many competitive athletes continue their sports with appropriate precautions.

Electronics: Modern pacemakers and ICDs are well-shielded. Cell phones are safe — just don't rest the phone directly over the device for prolonged periods. Household appliances, computers, and televisions pose no risk. Airport metal detectors and body scanners are fine — just show your device card to security and request a hand wand instead of walking through a full-body scanner if it triggers an alarm.

MRI scans: Older devices were MRI-incompatible. Most devices implanted since 2010 are MRI-conditional — meaning you can safely have an MRI under specific conditions (usually 1.5 Tesla, with the device reprogrammed beforehand). Always tell the MRI team about your device. They'll confirm compatibility and adjust settings.

ICD Shocks: Appropriate and Inappropriate

Appropriate shocks save lives. But inappropriate shocks — when the device fires for a non-dangerous rhythm like SVT or atrial fibrillation — are a real problem. They're painful, frightening, and psychologically damaging. The MADIT-RIT trial showed that programming higher detection rates and longer detection intervals reduced inappropriate shocks by 79% without compromising safety.

If you receive a shock and feel fine afterward, call your electrophysiologist's office — it's not an emergency but should be reviewed. If you receive multiple shocks in a row, call 911. That suggests an ongoing arrhythmia that needs immediate evaluation.

Psychological impact is real. A 2024 study in Europace found that 25% of ICD patients develop significant anxiety related to potential shocks, and 15% meet criteria for PTSD. Device-specific cognitive behavioral therapy programs exist and are effective. Don't suffer in silence.

Battery Life and Replacement

Pacemaker batteries last 8-15 years depending on how much pacing is needed. ICD batteries last 5-10 years due to higher energy requirements. When the battery runs low, the generator is replaced in a minor outpatient procedure — the leads are usually left in place and connected to the new generator. This is a much simpler surgery than the original implant.

Key Takeaways

- Pacemakers treat slow rhythms silently; ICDs also treat dangerous fast rhythms with a noticeable but life-saving shock

- Implantation is a 1-3 hour procedure under local anesthesia — most patients go home the same day

- Exercise, travel, cell phones, and most electronics are safe — contact sports are the main restriction

- Modern devices (post-2010) are mostly MRI-conditional — always inform the imaging team about your device

- 25% of ICD patients develop anxiety about shocks — psychological support is available and effective

Living with a cardiac device? Track your vitals, appointments, and device check schedules with our Smart Journey cardiac device management portal.