- tachycardia) because of rapid firing of the sinoatrial (sinus) node. This occurs in response to exercise, exertion, excitement, pain, fever, excessive thyroid hormone, low blood oxygen (hypoxia), stimulant drugs (such as caffeine), etc. The lack of normal sinus rhythm is an arrhythmia, an abnormal heart rhythm.
* * *sinus rhythm n the rhythm of the heart produced by impulses from the sinoatrial node
* * *normal heart rhythm originating in the sinoatrial node.
Medical dictionary. 2011.
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Sinus rhythm — is a term used in medicine to describe the normal beating of the heart, as measured by an electrocardiogram (ECG). It has certain generic features that serve as hallmarks for comparison with normal ECGs. ECG Structure There are typically five… … Wikipedia
sinus rhythm — noun Date: 1911 the rhythm of the heart produced by impulses from the sinus node < restored the patient to normal sinus rhythm > … New Collegiate Dictionary
sinus rhythm — a normal heart rhythm, usually as recorded on an electrocardiogram. The sinoatrial node, located in the right atrium, normally functions as the natural pacemaker for the heart … The new mediacal dictionary
Sinus — may refer to:In anatomy, where a sinus is a sac or cavity in any organ or tissue: *Sinus (anatomy), description of the general term *Anal sinuses, the furrows which separate the columns in the rectum *Paranasal sinuses, air cavities in the… … Wikipedia
Rhythm, sinus — The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node. It is located in the wall of the right atrium (the right upper chamber of the heart). Normal cardiac impulses start there and… … Medical dictionary
Sinus tachycardia — A fast heartbeat (tachycardia) because of rapid firing of the sinoatrial (sinus) node. The sinoatrial (or sinus) node is the natural pacemaker of the heart. It is located in the wall of the right atrium (the right upper chamber of the heart).… … Medical dictionary
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
Sinus arrhythmia — The normal increase in heart rate that occurs during inspiration (when you breathe in). This is a natural response and is more accentuated in children than adults. The sinus refers to the natural pacemaker of the heart which is called the… … Medical dictionary
sinus arrest — a halt, usually transient, in the normal cardiac (sinus) rhythm due to a slowing or cessation of impulse initiation by the sinus node, lasting for an interval that is not an exact multiple of the normal cardiac cycle; either ectopic pacemakers… … Medical dictionary
sinus pause — a transient interruption in the sinus rhythm, of a duration that is not an exact multiple of the normal cardiac cycle. See also sinus arrest, under arrest … Medical dictionary