sinus bradycardia


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Related to sinus bradycardia: sinus arrhythmia, Sinus tachycardia

bradycardia

 [brad″e-kahr´de-ah]
slowness of the heartbeat, so that the pulse rate is less than 60 per minute. This can occur in normal persons, particularly during sleep; trained athletes also usually have slow pulse and heart rates. adj., adj bradycar´diac.
fetal bradycardia a fetal heart rate of less than 120 beats per minute, generally associated with hypoxia; it is usually due to placental insufficiency; it may also result from transfer of local anesthetics or beta-adrenergic blocking agents, and rarely to heart block associated with congenital heart disease or maternal collagen vascular disease.
nodal bradycardia bradycardia in which the stimulus of the heart's contraction arises in the atrioventricular node or common bundle.
sinoatrial bradycardia (sinus bradycardia) 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.
bradycardia-tachycardia syndrome any cardiac dysrhythmia characterized by alternating slow and fast heart rates, often resulting in hemodynamic compromise. See also sick sinus syndrome.

si·nus bra·dy·car·di·a

bradycardia originating in the normal sinus pacemaker.

sinus bradycardia

beating of the sinus node at a rate below 60/min.

sinus bradycardia

A heart rhythm caused by sinus-node dysfunction (sick sinus syndrome), which is characterised by a rhythm of less than 60 beats/minute.

Clinical findings
Lightheadedness, dizziness, hypotension and syncope.

Aetiology
Vagal hypertonicity, hypothermia, hypothyroidism, SA node disease, drugs (e.g., digitalis, beta blockers, calcium channel blockers), viral myocarditis or bacterial endocarditis.

EKG
Normal P waves, P-R interval of 0.12–0.20 seconds, QRS complex < 0.12 seconds.

sinus bradycardia

Cardiology Sinus-node dysfunction–sick sinus syndrome characterized by a normal P-wave axis of < 60 beats/min EKG Every P wave is followed QRS complexes , or at < 50 beats/min. See Sick sinus syndrome. Cf Sinus tachycardia.

si·nus bra·dy·car·di·a

(sī'nŭs brad'ē-kahr'dē-ă)
A heart rate less than 60 beats per minute with a normal rhythm.

sinus bradycardia

A slow, regular, heart rate resulting from a low rate of pacing by the SINOATRIAL NODE. The heart rate is less than 60 beats per minute. Sinus bradycardia is a normal, healthy feature of high physical fitness but may also occur in conditions such as HYPOTHYROIDISM in which the metabolic rate is reduced. It may also be caused by beta-blockers and other drugs.

bradycardia

slowness of the heartbeat, in dogs and cats to less than 60 beats per minute.

sinus bradycardia
a slow sinus rhythm, characterized by normal electrocardiographic complexes in a normal rhythm or a sinus arrhythmia. A normal finding, most commonly seen in large breeds of dogs or athletic animals.
Enlarge picture
Sinus bradycardia in a dog. By permission from Ettinger SJ, Feldman E, Textbook of Veterinary Internal Medicine, Saunders, 2004
bradycardia-tachycardia syndrome
see sick sinus syndrome.
References in periodicals archive ?
Types of arrhythmia include sinus bradycardia, atrial premature beats, bundle block, and different degrees of AV block.
Other electrocardiographic manifestations of hypothermia include sinus bradycardia, atrial and ventricular arrhythmias, prolonged intervals (PR, QRS, QT), different degrees of atrioventricular block, and findings related to electrolyte abnormalities (ie, hyperkalemia).
A patient who has been shown to have persistent sinus bradycardia and five- to six-second pauses associated with dizziness would most likely have sinus node dysfunction, or the 'sick sinus syndrome.
These steroids can adversely effect the myocardium (3), and the most life-threatening manifestations of toxicity include arrhythmias, ventricular ectopy, sinus bradycardia, atrial arrhythmias, and hyperkalemia (2).
Sinus tachycardia was present in 23% and sinus bradycardia in 12% of the sample population.
At the age of 6 years, he underwent permanent pacemaker implantation for sinus bradycardia.
Table: Electrocardiographic abnormalities in pulmonary embolism Rhythm Sinus tachycardia Atrial premature complexes Atrial flutter Atrial fibrillation Right ventricular premature complexes Ventricular fibrillation Sinus bradycardia or asystole (rarely) P waves Rightward axis ([greater than or equal to] 75[degrees]) Tall (>2.
Tsutsui and colleagues have described alcohol ingestion-induced sinus bradycardia and hypotension in two patients with carotid sinus hypersensitivity, suggesting a paradoxical increase in parasympathetic activity and/or decrease in sympathetic activity (13).
Review of the Holter recording showed an episode of significant ST elevation, followed by a progressive sinus bradycardia, and finally a 10 second period of asystole (Fig.
An electrocardiogram (ECG) showed sinus bradycardia with borderline first-degree atrioventricular block and voltage criteria for left ventricular hypertrophy.
Brady tachy syndrome is defined as an arrhythmia originating in the atrium, the heart's upper chamber, formed by the alternation of various atrial fast rhythms with sinus bradycardia or sino-atrial block.