SFHAM

SFHAM (single fibre based heart activity model) is a physical model describing the electric activity of the left ventricle of the heart during its depolarisation. It facilitates a precise analysis of electric potentials of different parts of the ventricle.

Main principles of the model
The SFHAM model is based on the following principles:
 * Each part of the cardiac muscle (interventricular septum, anterior wall, inferior wall, lateral wall, posterior wall) is the source of independent instantaneous potential.
 * Electric potential coming from a particular part of the myocardium is the result of variation in electric charge density including endocardium, M cells and epicardium.
 * QRS unit is the result of the sum of all instantaneous potentials generated during depolarization of particular parts of myocardium.
 * The value of instantaneous potential depends on the quality and activity of particular parts of the ventricle walls.
 * Time changes in the value of the potentials distribution occurring on the surface of the chest depend on physiological and pathological factors.
 * Electrical activity of each part of the myocardium of a healthy individual forms a constant contribution expressed in percentage into the entire activity of the myocardium.

The model constitutes a theoretical basis for SATRO-ECG being a system to non-invasive diagnosing facilitating early detection ischemic changes in the heart.