bradycardia-tachycardia syndrome


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Related to bradycardia-tachycardia syndrome: sick sinus syndrome

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.

bradycardia-tachycardia syndrome

Etymology: Gk, bradys + kardia, + tachys, fast, kardia + syn, together, dromos, course
a disorder characterized by a heart rate that alternates between being abnormally low (less than 60 beats/min) and abnormally high (greater than 100 beats/min). Also called bradytachycardia, tachycardia-bradycardia syndrome. See also sick sinus syndrome, sinus node dysfunction.

bradycardia-tachycardia syndrome

Brady-tachy syndrome Cardiology A form of sinus-node dysfunction–sick sinus syndrome characterized by alternating periods of atrial tachyarrhythmias and bradycardias. See Sick sinus syndrome.

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.
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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.