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 natural pacemaker which creates the normal regular heartbeat. "Bradycardia" means that the heart rate is slower than normal. Fainting can occur with sinus bradycardia if the heart slows down even more. This can occur, for example, when the vagus nerve sends a signal to the heart that suddenly drops the heart rate. Choking or gagging can trigger this response which is called the vasovagal reflex. US President George W. Bush has sinus bradycardia and had an episode of fainting due to a vasovagal response after choking on a pretzel.

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sinus bradycardia n abnormally slow sinus rhythm specif sinus rhythm at a rate lower than 60 beats per minute

Medical dictionary. 2011.

Look at other dictionaries:

  • 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… …   Wikipedia

  • 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

  • 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

  • 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

  • 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

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