Bradycardia is a condition typically defined wherein an individual has a resting heart rate of under 60 beats per minute in adults. 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.
During sleep, bradycardia with a frequency of around 40-50 BPM is common and considered normal. Highly trained athletes may also have athletic heart syndrome, very slow heartbeat at rest, which occurs as a sport adaptation and helps prevent tachycardia during training.
The term "relative bradycardia" is used to refer to a heart rhythm that, although not actually below 60 beats per minute still is considered too slow for natural persons current medical condition.
The word "aetiology" comes from the Greek βραδύς, Bradi "slow", and καρδία, kardia, the "heart".
- Sinus bradycardia is a sinus rhythm with a rate that is lower than normal. In humans, bradycardia is generally defined to be a rate of under 60 beats
- Reflex bradycardia is a bradycardia decrease in heart rate in response to the baroreceptor reflex, one of the body s homeostatic mechanisms for preventing
- Ictal bradycardia is when people with temporal lobe epilepsy experience bradycardia with their seizures epileptic discharges Bradycardia is defined
- malfunction of the sinus node, the heart s primary pacemaker. Tachycardia - bradycardia syndrome is a variant of sick sinus syndrome in which the arrhythmia
- have sinus bradycardia atrioventricular block, cardiogenic shock, or overt cardiac failure. The drug has been associated with bradycardia and hypertension
- adaptations to conserve oxygen during submersion, the apnea and its duration, bradycardia vasoconstriction, and redistribution of cardiac output occur also in
- pressure. Side effects of aceclidine include increased salivation and bradycardia in excessive doses Aceclidine acts as a muscarinic acetylcholine receptor
- 60 beats per minute in the adult patient is called bradycardia Not all instances of bradycardia require medical treatment. Normal heart rate varies
- heart rate are among the narrowest limits between bradycardia and tachycardia. See the Bradycardia and Tachycardia articles for more detailed limits.
- intervention used primarily to correct profound bradycardia It can be used to treat symptomatic bradycardias that do not respond to transcutaneous pacing