- 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). Normal cardiac impulses start there and are transmitted to the atria and down to the ventricles (the lower chambers of the heart). Sinus tachycardia occurs in response to exercise, exertion, excitement, pain, fever, excessive thyroid hormone, low blood oxygen (hypoxia), stimulant drugs (such as caffeine and amphetamines), etc. Although sinus tachycardia is usually a response to one or another fleeting stimulus, it can upon occasion be a sign of heart failure, heart valve disease, or another significant illness.
* * *sinus tachycardia n abnormally rapid sinus rhythm specif sinus rhythm at a rate greater than 100 beats per minute
* * *(ST) tachycardia originating in the sinus node; it is normal during exercise or anxiety and occurs abnormally associated with shock, hypotension, hypoxia, congestive heart failure, fever, and various high output states.
Sinus tachycardia (150 beats per minute) during acute myocardial ischemia. P waves are indicated by arrowheads.
Medical dictionary. 2011.
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Tachycardia, sinus — 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 rhythm — 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
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