title: SFHAM
text: # 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.
  
  