Bradycardia

slow heart rateslowed heart ratebradyarrhythmiabradyarrhythmiaslow heart rateslow heart beatslowed heartbeata slow heart ratea slowed heart ratebradycardic
Bradycardia is a condition typically defined wherein an individual has a resting heart rate of under 60 beats per minute (BPM) in adults.wikipedia
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Heart rate

heartbeatresting heart ratemaximum heart rate
Bradycardia is a condition typically defined wherein an individual has a resting heart rate of under 60 beats per minute (BPM) in adults.
Bradycardia is a slow heart rate, defined as below 60 bpm at rest.

Athletic heart syndrome

athlete's heartoccurs naturally
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.
Athletic heart syndrome (AHS) is a non-pathological condition commonly seen in sports medicine in which the human heart is enlarged, and the resting heart rate is lower than normal.

Syncope (medicine)

syncopefaintingfainted
When symptomatic, it may cause fatigue, weakness, dizziness, sweating, and at very low rates, fainting.
Neurally mediated syncope occurs when blood vessels expand and heart rate decreases inappropriately.

Sick sinus syndrome

sinus node dysfunctionabnormally slow sinus node
The third, sick sinus syndrome, covers conditions that include severe sinus bradycardia, sinoatrial block, sinus arrest, and bradycardia-tachycardia syndrome (atrial fibrillation, flutter, and paroxysmal supraventricular tachycardia).
It can result in many abnormal heart rhythms (arrhythmias), including sinus arrest, sinus node exit block, sinus bradycardia, and other types of bradycardia (slow heart rate).

Atropine

atropine sulfateatropine eye dropsAtropine methonitrate
Treatment often consists of the administration of atropine and cardiac pacing.
Atropine is a medication used to treat certain types of nerve agent and pesticide poisonings as well as some types of slow heart rate and to decrease saliva production during surgery.

Heart arrhythmia

cardiac arrhythmiaarrhythmiaarrhythmias
This dysrhythmia also may occur when the electrical impulses from the SA node fail to reach the AV node because of SA or AV block.
A heart rate that is too fast – above 100 beats per minute in adults – is called tachycardia, and a heart rate that is too slow – below 60 beats per minute – is called bradycardia.

Vagus nerve

vagusvagalcranial nerve X
This is thought to be caused by changes in the vagal tone during respiration.
Hyperstimulation of parasympathetic influence promotes bradyarrhythmias.

Hypothyroidism

hypothyroidhypo-underactive thyroid
Noncardiac causes are usually secondary, and can involve recreational drug use or abuse; metabolic or endocrine issues, especially in the thyroid; an electrolyte imbalance; factors; autonomic reflexes; situational factors such as prolonged bed rest; and autoimmunity.
The illness is characterized by very low body temperature without shivering, confusion, a slow heart rate and reduced breathing effort.

Artificial cardiac pacemaker

pacemakerartificial pacemakerpacemakers
It is difficult and sometimes impossible to assign a mechanism to any particular bradycardia, but the underlying mechanism is not clinically relevant to treatment, which is the same in both cases of sick sinus syndrome: a permanent pacemaker.
Transcutaneous pacing (TCP), also called external pacing, is recommended for the initial stabilization of hemodynamically significant bradycardias of all types.

Dopamine (medication)

Dopamine
If this is not effective, intravenous inotrope infusion (dopamine, epinephrine) or transcutaneous pacing should be used.
Dopamine, sold under the brandname Intropin among others, is a medication most commonly used in the treatment of very low blood pressure, a slow heart rate that is causing symptoms, and, if epinephrine is not available, cardiac arrest.

Third-degree atrioventricular block

complete heart blockthird degree AV blockThird degree heart block
Atrioventricular conduction disturbances (AV block; primary AV block, secondary type I AV block, secondary type II AV block, tertiary AV block) may result from impaired conduction in the AV node, or anywhere below it, such as in the bundle of His.
People with third-degree AV block typically experience severe bradycardia (an abnormally low measured heart rate), hypotension, and at times, hemodynamic instability.

Diving reflex

mammalian diving reflexcold water immersiondiving animals
Bradycardia is also part of the mammalian diving reflex.
Although aquatic animals have evolved profound physiological adaptations to conserve oxygen during submersion, the apnea and its duration, bradycardia, vasoconstriction, and redistribution of cardiac output occur also in terrestrial animals as a neural response, but the effects are more profound in natural divers.

Neonatal intensive care unit

NICUincubatorneonatal intensive care
Neonatal intensive-care unit (NICU) standard practice is to electronically monitor the heart and lungs for this reason.

Transvenous pacing

Pacing wirescardiac pacing
Transvenous pacing may be required if the cause of the bradycardia is not rapidly reversible.
It can be used to treat symptomatic bradycardias that do not respond to transcutaneous pacing or to drug therapy.

Sinus bradycardia

Low heart rate
Sinus bradycardia is a sinus rhythm with a rate that is lower than normal.

Transcutaneous pacing

mechanical pacingpacing
If this is not effective, intravenous inotrope infusion (dopamine, epinephrine) or transcutaneous pacing should be used.
By convention, a heart rate of less than 60 beats per minute in the adult patient is called bradycardia.

Electrocardiography

electrocardiogramECGEKG
This usually appears on an EKG with a normal QRS complex accompanied with an inverted P wave either before, during, or after the QRS complex.
A heart rate below normal is called "bradycardia" (100 in adults).

Calcium channel blocker

calcium channel blockerscalcium-channel blockerscalcium antagonist
Beta blockers may slow the heart rate to a dangerous level if prescribed with calcium channel blocker-type medications.
Caution should be taken when using verapamil with a beta blocker due to the risk of severe bradycardia.

Cardiology

cardiologistcardiologistscardiovascular medicine
A heart rate that is too fast – above 100 beats per minute in adults – is called tachycardia and a heart rate that is too slow – below 60 beats per minute – is called bradycardia.

Athlete

playerathletessportsman
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.

Tachycardia

fast heart rateincreased heart raterapid heart rate
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.

Sinus rhythm

normal sinus rhythmnormal rhythm(sinus) rhythm
The second, sinus bradycardia, is a sinus rhythm of less than 60 BPM.

Benignity

benignnon-cancerousnoncancerous growths
Studies have found that 50–85% of conditioned athletes have benign sinus bradycardia, as compared to 23% of the general population studied.

Paroxysmal supraventricular tachycardia

PSVTparoxysmal supraventricular
The third, sick sinus syndrome, covers conditions that include severe sinus bradycardia, sinoatrial block, sinus arrest, and bradycardia-tachycardia syndrome (atrial fibrillation, flutter, and paroxysmal supraventricular tachycardia).

QRS complex

QRSJ-pointR wave
This usually appears on an EKG with a normal QRS complex accompanied with an inverted P wave either before, during, or after the QRS complex.