Medicine: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.

Bibliography

• Janicki JS, Leoński W, Jagielski J. Partial potentials of selected cardiac muscle regions and heart activity model based on single fibres. Medical Engineering & Physics, 31 (2009) 1276-1282 [1]
• Janicki JS, Leoński W, Jagielski J, Sobieszczańska M, Chąpiński M, Janicki Ł. Single Fibre Based Heart Activity Model (SFHAM) Based Qrs-Waves Synthesis. W: Sobieszczańska M, Jagielski J, Macfarlane PW, editors. Electrocardiology 2009. JAKS Publishing Company; 2010. p. 81-86, ISBN:978-83-928209-5-6 [2]
• Janicki JS, Leoński W, Jagielski J, Sobieszczańska M, Leońska JG. Implementation of SFHAM in Coronary Heart Disease Diagnosis. W: Sobieszczańska M, Jagielski J, Macfarlane PW, editors. Electrocardiology 2009. JAKS Publishing Company; 2010. p. 197-201, ISBN:978-83-928209-5-6 [3]

External links

• SFHAM model and SATRO-ECG method web page (english)
• Instytut Badań Fizykomedycznych The Institute for Physico-Medical Research web page (polish)