Blood supply of heart

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Introduction:

Right coronary artery (RCA) supplies:

  • Right atrium
  • Right ventricle
  • SA node
  • AV node
  • Apex of the heart
  • Left bundle of His
  • Posterior 1/3rd of IV septum.

Left coronary artery (LCA) supplies:

  • Left atrium
  • Left ventricle
  • Apex of heart
  • (Left + Right) bundle of His
  • Anterior 2/3rd of IV septum.

Note: Apex of the heart is supplied by both LCA & RCA. But if both are given in options, we have to choose LCA.

Dominance of heart:

  • If posterior descending/ interventricular artery is a branch of RCA, it is called ‘Right dominance’
  • If posterior descending/ interventricular artery is a branch of LCA, it is called ‘Left dominance’
  • If posterior descending/ interventricular artery is a branch of both RCA and LCA, it is called ‘Co-dominance’
  • Right dominance is most common (seen in 85% of individuals).

Localization of the site of infarction

 

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