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 ?
1) Sinus bradycardia 1 Sinus pause 1 Groups p ([alpha]) Odds Ratio ([beta]) (95% CI) Type 5-12 years Frequent VE and SVE old (n=55) 13-16 years Frequent VE and SVE old (n=65) WPW Syndrome 0.
Sinus bradycardia is not commonly included among relevant biomarkers precipitating overt cardiovascular disease (1); a low resting sinus rate even appears to be a protecting factor against heart failure, but a high sinus rate emerged as an independent predictor of mortality in prospective studies carried out in the general population (3) and in selected groups of patients with hypertension (4) or myocardial infarction (5).
In a limited series, the cervical vagosympathetic trunks were sectioned and the right distal stump was stimulated with bipolar stainless steel electrodes supra (1 ms, 1 to 4 mA, 15 to 30 Hz) until sinus bradycardia, sinus arrest and then the initiation of AF was obtained.
Despite these interventions, on hospital day 5, her rhythm remained sinus bradycardia at 52 bpm.
Transient sinus bradycardia occurs in many patients with inferior infarcts at the time of acute reperfusion.
NEXTERONE is contraindicated in patients with known hypersensitivity to any of the components of NEXTERONE, including iodine, or in patients with cardiogenic shock, marked sinus bradycardia, and second- or third-degree AV block unless a functioning pacemaker is available.
What allows the idioventricular rhythm to emerge and then disappear is sinus bradycardia with slight sinus arrhythmia.
Electrocardiographic abnormalities in pulmonary embolism* Rhythm Sinus tachycardia+ Atrial premature complexes+ Atrial flutter Atrial fibrillation Right ventricular premature complexes Ventricular fibrillation Pulseless electrical activity Sinus bradycardia or asystole (rarely) P waves Rightward axis ([greater than or equal to] 75[degrees]) [+ or -] Tall (>2.
InnoPran XL is contraindicated in cardiogenic shock, sinus bradycardia and greater than first-degree block, bronchial asthma and in patients with known hypersensitivity to propranolol hydrochloride.
is contraindicated in patients with cardiogenic shock, marked sinus bradycardia, and second- or third-degree AV block in the absence of a functioning pacemaker.
BETIMOL is contraindicated in patients with overt heart failure, cardiogenic shock, sinus bradycardia, second-or third-degree atrioventricular block, bronchial asthma or history of bronchial asthma, severe chronic obstructive pulmonary disease, or hypersensitivity to any component of this product.
is contraindicated in patients with cardiogenic shock, marked sinus bradycardia, and second- or third degree AV block in the absence of a functioning pacemaker.