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 are transmitted to the atria and down to the ventricles (the lower chambers of the heart). Sinus arrhythmia refers to the normal increase in heart rate that occurs during inspiration (when you breathe in). This is a normal response and is more accentuated in children than adults. Sinus tachycardia refers to a fast heartbeat (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.

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sinus rhythm n the rhythm of the heart produced by impulses from the sinoatrial node

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normal heart rhythm originating in the sinoatrial node.

Medical dictionary. 2011.

Look at other dictionaries:

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  • 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

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