Heart Rhythm and ECG's

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Heart Rhythm 

The Basic Rhythm of the heart is maintained by a wave fof electrical excitation:

  • Wave of excitation starts at the Sino-Atrial Node (SAN)
  • This causes the atria to contract and a heartbeat is initiated 
  • There is a layer of non-conducting tissue that prevents gthe excitation passing directly to the ventricles 
  • Electrical activity from the SAN is picked up by the Atri-Ventricular Node (AVN). 
  • The AVN imposes a slight delay before it stimulates the Bundle of His
  • The Bundle of His is a bundle of collecting tissue that is made up of Purkyne Fibres, these go through the septum between the ventricles 
  • Bundle of His separates into two branches as it conducts the wave of excitation to the Apex of the heart. 
  • At the Apex the Purkyne Fibres spread out through the walls of the heart. 
  • The excitation spreads which triggers the contraction of the ventricles. 
  • The contraction starts at

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