SFHAM
SFHAM 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 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.