Saphenous Vein
A vein located in the leg, that is commonly used as a conduit to perform
coronary artery bypass grafts.
Sinus Node
Bundle of excitatory tissue found in the right atrium that functions as
the pacemaker of the heart.
Stenosis
1. A blockage or narrowing in the lumen of a vessel, thereby
compromising optimal flow of fluid or blood. 2. A narrowing or blockage of a
coronary artery.
Sternal
1. Relating to the sternum or breastbone. 2. Region between two mammary
regions.
Stroke
Brain injury caused by abrupt disruption of blood flow to the brain. Most
frequently caused by arterial occlusion (due to thrombosis or embolism) or
to intracranial hemorrhage (rupture of blood vessel or aneurysm).
Stroke volume
The amount of blood ejected by the ventricle during a ventricular
contraction.
Subcutaneous
Beneath the skin.
Superficial
Toward or on the surface of the body.
Superior
Above another structure.
Supine
Lying on the back.
Systole
Referring to the period of time during contraction of the ventricle(s).
Systolic Pressure
The arterial blood pressure during the systolic phase of the cardiac cycle.
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