# Arrhythmia (heart rhythm problems)

Condition · id `cardio:arrhythmia` · Cardiovascular Atlas · release `5dcd9b263fe17744` (public)

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Browse, organ or system: Heart  
Browse, condition area: Heart rhythm problems  

## In plain language

An arrhythmia means the heartbeat is too fast, too slow or uneven. Some changes in rate are normal, for example a faster beat during exercise. When an uneven rhythm keeps happening, the heart may be moving too little blood, and an arrhythmia left untreated can harm the heart, the brain or other organs. Medicines or procedures can often bring the rhythm under control.

## Technical summary

Parent page for rhythm conditions. MeSH descriptor D001145 (Arrhythmias, Cardiac). Atrial fibrillation is the only subtype with a page so far. The text rests on a US government patient page and the MedlinePlus arrhythmia page, which are patient information and give no numbers.

## Connected pages

- Filed under this front: Devices and monitoring (`cardio:front-devices-and-monitoring`)
- Related to: MedlinePlus (`core:medlineplus`)
- Has subtype: Atrial fibrillation (AF) (`cardio:atrial-fibrillation`)
- Related to: Sudden cardiac arrest (`cardio:sudden-cardiac-arrest`)

## Provenance

Content hash: 84d4728e291bbb345256ec54a7b5f755a664165c303c192dc29872542c3e1369
Last substantive edit: 2026-10-15
Evidence last checked: 2026-10-14