Locating Myocardial Damage

Locating Myocardial Damage

After you have noted characteristic lead changes of an acute MI, use this chart to identify the areas of damage. Match the lead changes in the second column with the affected wall in the first column and the artery involved in the third column. Column four shows reciprocal lead changes.

Wall affected	Leads	Artery involved	Reciprocal changes
Anterior	V₃ to V₄	Left coronary artery, left anterior descending (LAD) artery	II, III, aV_F
Anterolateral	I, aV_L, V₃ to V₆	LAD artery, circumflex artery	II, III, aV_F
Septal	V₁ to V₂	LAD artery	None
Inferior	II, III, aV_F	Right coronary artery	I, aV_L
Lateral	I, aV_L, V₅, V₆	Circumflex artery, branch of left coronary artery	II, III, aV_F
Posterior	V₈, V₉	Right coronary artery, circumflex artery	V₁ to V₄
Right ventricular	V_4R, V_5R, V_6R	Right coronary artery	None

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