Synonyms bradyarrhythmia, brachycardia
Sinus bradycardia lead2.svg
Sinus bradycardia seen in lead II with a heart rate of about 50.
Classification and external resources
Specialty Cardiology
ICD- 10 R00.1
ICD- 9-CM 427.81, 659.7, 785.9, 779.81
Patient UK Bradycardia
MeSH D001919

Bradycardia is a condition wherein an individual has a slow heart rate, typically defined as a heart rate of under 60 beats per minute (BPM) in adults. [1] Bradycardia typically does not cause symptoms until the rate drops below 50 BPM. When symptomatic, it may cause fatigue, weakness, dizziness, sweating, and at very low rates, fainting. [2]

During sleep, a slow heartbeat with rates around 40–50 BPM is common, and is considered normal. Highly trained athletes may also have athletic heart syndrome, a very slow resting heart rate that occurs as a sport adaptation and helps prevent tachycardia during training.

The term relative bradycardia is used in explaining a heart rate that, although not actually below 60 BPM, is still considered too slow for the individual's current medical condition.


Bradycardia in an adult is any heart rate less than 60 beats per minute (BPM), although symptoms usually manifest only for heart rates less than 50 BPM. [3]

Other Languages
العربية: بطء القلب
català: Bradicàrdia
čeština: Bradykardie
Deutsch: Bradykardie
español: Bradicardia
فارسی: کندتپشی
français: Bradycardie
한국어: 느린맥
हिन्दी: मंदनाड़ी
hrvatski: Bradikardija
Bahasa Indonesia: Bradikardia
italiano: Bradicardia
עברית: ברדיקרדיה
македонски: Брадикардија
Nederlands: Bradycardie
日本語: 徐脈
norsk: Bradykardi
norsk nynorsk: Bradykardi
oʻzbekcha/ўзбекча: Bradikardiya
polski: Bradykardia
português: Bradicardia
română: Bradicardie
русский: Брадикардия
Simple English: Bradycardia
slovenčina: Bradykardia
српски / srpski: Брадикардија
srpskohrvatski / српскохрватски: Bradikardija
svenska: Bradykardi
українська: Брадикардія
粵語: 心律過慢
中文: 心跳过缓