Sinus bradycardia

Sinus bradycardia

SignSymptom infobox
Name = Sinus bradycardia
ICD10 =
ICD9 = ICD9|427.81
MeshID = D001146

Sinus bradycardia is a heart rhythm that originates from the sinus node and has a rate of under 60bpm.

Etiology

*This rhythm may be caused by one of the following:
**Increased vagal tone.
**Intrinsic disease of the SA node.
**An effect of drugs, such as the use of digitalis, beta-blockers, or quinidine.
**Sleep
**It could also be a normal finding in a healthy, well-conditioned person.

ECG Characteristics

*Rate: Less than 60.
*Rhythm: Regular.
*P waves: Upright, consistent, and normal in morphology and duration.
*P-R Interval: Between 0.12-0.20 seconds in duration.
*QRS Complex: Less than 0.12 seconds in width, and consistent in morphology.

ignificance

The decreased heart rate can cause a decreased cardiac output resulting in symptoms such as lightheadedness, dizziness, hypotension, vertigo, and syncope. The slow heart rate may also lead to atrial, junctional, or ventricular ectopic rhythms.

Sinus Bradycardia is not necessarily a bad symptom. People who regularly practice sports may have sinus bradycardia, because their trained hearts can pump enough blood in each contraction.

Sinus Bradycardia can aid in the sport of Freediving, which includes any of various aquatic activities that share the practice of breath-hold underwater diving. Bradycardia aids in this process due to drop in blood rate pulse. These adaptations enable the human body to endure depth and lack of oxygen far beyond what would be possible without the mammalian diving reflex.

See also

*Sinus tachycardia
*Long QT syndrome


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Sinus bradycardia — A regular but unusually slow heart beat (60 beats/minute or less at rest). Sinus bradycardia can be the result of many things including good physical fitness, medications, and some forms of heart block. Sinus refers to the sinus node, the heart s …   Medical dictionary

  • Bradycardia — SignSymptom infobox Name = Bradycardia ICD10 = ICD10|R|00|1|r|00 ICD9 = ICD9|427.81, ICD9|659.7, ICD9|785.9, ICD9|779.81 Bradycardia, as applied to adult medicine, is defined as a resting heart rate of under 60 beats per minute, though it is… …   Wikipedia

  • bradycardia — bradycardic, adj. /brad i kahr dee euh/, n. Med. a slow heartbeat rate, usually less than 60 beats per minute. [1885 90; BRADY + CARDIA] * * * ▪ pathology       type of arrhythmia (abnormal heart rhythm) characterized by slowing of the heart rate …   Universalium

  • Bradycardia — A slow heart rate, usually defined as less than 60 beats per minute. The word bradycardia is logically derived from two Greek roots: bradys, slow + cardia, heart = slow heart. * * * Slowness of the heartbeat, usually defined (by convention) as a… …   Medical dictionary

  • Sinus tachycardia — Infobox Disease Name = Sinus tachycardia Caption = DiseasesDB = 12135 ICD10 = ICD9 = ICD9|427.81 ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D013616 Sinus tachycardia (also colloquially known as sinus tach or sinus… …   Wikipedia

  • bradycardia — n. slowing of the heart rate to less than 50 beats per minute. Sinus bradycardia is often found in healthy individuals, especially athletes, but it is also seen in some patients with reduced thyroid activity, jaundice, hypothermia, or vasovagal… …   The new mediacal dictionary

  • sinoatrial bradycardia — sinus bradycardia (SB) a slow sinus rhythm, with a heart rate of less than 60 beats per minute in an adult; it is common in young adults and in athletes but is also a manifestation of some disorders. Sinus bradycardia. The second and third QRS… …   Medical dictionary

  • bradycardia-tachycardia syndrome — brady tachy syndrome a clinical manifestation of the sick sinus syndrome characterized by periods of atrial and ventricular bradycardia alternating with periods of rapid regular or irregular atrial or ventricular tachyarrhythmias …   Medical dictionary

  • Sick sinus syndrome — Infobox Disease Name = PAGENAME Caption = Schematic representation of the atrioventricular bundle of His. DiseasesDB = 12066 ICD10 = ICD10|I|49|5|i|30 ICD9 = ICD9|427.81 ICDO = OMIM = 163800 MedlinePlus = 000161 eMedicineSubj = med eMedicineTopic …   Wikipedia

  • Sick sinus syndrome — Symptoms of dizziness, confusion, fainting, and heart failure due to a problem with the sinus node of the heart, which acts as the body’s natural pacemaker. If the sinus node is not functioning normally, it is reflected in an abnormally slow… …   Medical dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”