S
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SA node
see Sinoatrial node
Sinoatrial (SA) node
This is a small group of cells in the right atrium that initiates the electrical signals that make the heart beat.
Sinus Rhythm
a normal type of rhythm initiated from the upper chambers of the heart with the electrical impulse passing normally into the lower chambers.
Sinus tachycardia
A normal increase in the heart rate, usually due to exercise, stress, or illness.
Slow ventricular tachycardia
An arrhythmia, usually below 160 beats per minutes, that can be associated with the same effects as faster ventricular tachycardias.
Specificity
Capability of an ICD to differentiate atrial from ventricular tachyarrhythmia to avoid treating cardiac rhythm disorders originating in the atrium.
Stimulus
an electrical impulse sent by the pacemaker to the heart.
Sudden cardiac death
Death due to an electrical problem in the heart. It is usually caused by ventricular fibrillation or ventricular tachycardia.
Syncope
fainting.