Heart Index – S

A B C D E F H I L M N O P R S T V
Saphenous vein

The long superficial vein which runs along the inner side of the leg.

Saturated fat

Fat which contains a high proportion of fatty acids having single bonds. It is found as a firm solid at room temperature.

Septum

Muscular wall dividing the chambers of the heart.

Sinus / Sinoatrial node

A small bundle of muscle fibres and nerves located in the right atria. It acts as the heart’s natural pacemaker.

Spectral Doppler echocardiography

A method of analyzing the speed and direction of blood flow in a person’s cardiovascular system through the use of sound waves.

Stent

An expandable metal tube such as a coil or wire mesh. It is typically inserted into a coronary artery after angioplasty to act as a “scaffolding” keeping that artery open.

Stroke

A cardiovascular disorder which occurs when a blood vessel supplying oxygen to the brain bursts or becomes blocked. Once deprived of oxygen, the nerve cells in the brain cannot function and begin to die, thus impairing the functions of those parts of the body which they control.

Systole

A period of contraction of the heart muscle during which blood is expelled from the ventricles.

Systolic blood pressure

The higher of the two readings recorded when measuring blood pressure. It reflects the pressure with which the heart contracts and pumps blood to the rest of the body.