Cardiac Device Infections

A cardiac device infection is an infection involving an implanted pacemaker, defibrillator or their leads — either in the pocket of skin holding the device or along the leads running into the heart — and it is treated seriously because bacteria growing on device surfaces are shielded from antibiotics that would otherwise clear them.

Anyone living with an implanted cardiac device should know what an infected pocket looks like. These infections can appear within weeks of implantation or years later, and the early signs are easy to dismiss.

Symptoms of cardiac device infections

• Redness, swelling, warmth or tenderness over the device pocket
• Fluid leaking from the pocket, or the device becoming visible through thinning skin
• Fever or chills with no other obvious explanation
• Night sweats, unintended weight loss, or prolonged tiredness
• New breathlessness or a general sense of being unwell
• Pain over the device that is new, rather than the discomfort of early healing

When should you see a specialist for a cardiac device infection?

• Any redness, swelling, discharge or skin breakdown over the device pocket — at any point after implantation
• Unexplained fever in anyone with an implanted cardiac device, however long ago it was placed
• A blood culture that has grown bacteria in a patient with a device
• The device or a lead becoming exposed through the skin — seek care urgently
• Fever that recurs after a course of antibiotics has finished

Frequently asked questions about cardiac device infections

Can a device infection be treated with antibiotics alone?

Sometimes the situation allows it, but often it does not, because bacteria attached to the device surface are protected from antibiotics. Whether the device can stay is assessed individually by the infectious disease and cardiology teams together, and is one of the main reasons specialist referral matters here.

How soon after implantation do these infections occur?

They can appear within weeks of the procedure or many years afterwards. A long gap since implantation does not rule out an infection, which is why unexplained fever in someone with a device is always worth investigating.

How is it diagnosed?

Usually through a combination of examination of the pocket, blood cultures taken before antibiotics are started, and echocardiography to look at the leads and heart valves. Additional imaging is sometimes used when the picture remains unclear.

If my device is removed, will I need another one?

Frequently yes, though not always, and the timing depends on clearing the infection first and on whether the original reason for the device still applies. That sequence is planned in advance with the cardiology team rather than decided in a hurry.

Can these infections be prevented?

Risk is reduced by careful technique at implantation and by attending promptly if the pocket looks inflamed. Reporting early changes over the pocket, rather than waiting to see whether they settle, is the single most useful thing a patient can do.

Conditions related to cardiac device infections

Where fever has persisted without a source being found, see Fever of Unknown Origin. Infections on orthopaedic implants follow comparable principles — see Bone & Joint Infections. For infections in the immunosuppressed, see Transplant Related Infections.

Our infectious disease specialist follows a comprehensive diagnostic approach using detailed history, clinical examination, and advanced investigations to identify the root cause and provide effective treatment.