Electrocardiography, Dr. D. Penney




Table 23. CAUSES OF (MEAN ELECTRICAL) AXIS DEVIATION
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  • Left axis deviation - pregnancy, extreme obesity (both push diaphragm up, changing heart position).

  • Right axis deviation - children, pulmonary obstructive disease.

  • LV or RV hypertrophy (adding cardiac tissue to one or other side), will give either left or right axis deviation; mean vector will point to the site of hypertrophy.

  • Myocardial infarction (loss of heart tissue); mean vector will point away from site of infarct.

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