Implantable cardiac devices.

A small implanted device that paces the heart when the heart's own electrical system is too slow or unreliable. Modern pacemakers include traditional transvenous, leadless, and resynchronization (CRT-P) types.

A newer defibrillator with a lead placed under the breastbone rather than inside a vein. It delivers shocks and anti-tachycardia pacing without anything in the bloodstream.

A defibrillator that sits entirely under the skin, with no wires inside the heart or veins. It protects against sudden cardiac death without the long-term risks of a transvenous lead — but it cannot pace.

An implanted device that constantly watches the heart's rhythm and delivers pacing or a shock to stop dangerous fast rhythms from the lower chambers (ventricular tachycardia and ventricular fibrillation).

A combined device that does two things at once: resynchronizes a weakened heart by pacing the left and right ventricles together, and protects against sudden cardiac death with defibrillation.

A small heart monitor about the size of a USB stick, placed just under the skin of the chest. It watches the heart's rhythm continuously for years and sends data home through a transmitter or smartphone.

An alternative left atrial appendage closure device that uses a lobe-and-disc design to seal the appendage from two sides at once, allowing patients with non-valvular atrial fibrillation to come off long-term blood thinners.

An implant that seals off the left atrial appendage — the small pouch where most AFib-related blood clots form — so patients with atrial fibrillation can come off long-term blood thinners.