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Pacemaker or defibrillator problems

Also called: Pacemaker problems, defibrillator problems, ICD shock

Problems with a heart device, like a shock, dizziness, or signs of infection at the site.

After a shockCall your device clinic

Overview

ICDs can shock to stop a dangerous rhythm. One shock with feeling well usually needs a call to the clinic.

Phones and magnets should be kept away from devices.

Symptoms

Common signs:

  • Shock from ICD

Less common

  • Dizziness

When to get medical care

Call 911More than one shock or a shock with chest pain.
Get care todaySwelling or redness at the device.
See a doctor soonSymptoms that last or keep coming back.

Causes

Device issues.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Who is more likely to get it

  • People with new devices: Wire problems are most common early

Possible complications

Diagnosis

A clinician asks about your symptoms and may order tests.

The exam

A physical exam.

Tests

Tests, if needed:

  • Device check:

Treatment

Treatment depends on the cause and how severe it is.

Self-care

  • Keep device checks

Prevention

To lower your risk or prevent problems:

  • Keep phones 6 inches away from the device

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to a cardiologist or electrophysiologist (heart rhythm doctor).

Living with it

  • Keep a simple diary of symptoms, triggers, and medicines to bring to visits.
  • Bring a list of your medicines and questions to each visit.
  • Stay active in ways that feel good to you.
  • Get enough sleep and manage stress.
  • Long-term illness can affect mood. Tell your doctor if you feel down or anxious.

Support groups and helplines

Back to school, work, or sports

  • Most people can keep working or going to school.
  • Ask about changes that help, like extra breaks or a flexible schedule. Workers may be covered by the ADA. Students may get a 504 plan.

Children, pregnancy, and older adults

  • People with devices: Carry an ID card.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your prenatal provider about this condition.
  • Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
  • Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
  • Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

For caregivers

  • Go to visits when you can and take notes.
  • Keep a list of medicines, allergies, and doctors in one place.
  • Learn the warning signs that need fast care.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Most device problems are easily fixed.

Most are fixed quickly.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • What's causing this?
  • What treatment do you recommend?
  • How often should my device be checked?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Pacemaker or defibrillator problems

Sources

Last updated 2026-11-12.