|A.||A normal heart|
Right ventricular hypertrophy
Left ventricular hypertrophy
Increased cardiac muscle mass
D i.e. Increased cardiac muscle mass
When the sum of voltages of all the QRS complexes of the three standard leads is greater than 4 millivolts, the ECG is considered as high voltage electrocardiogram. Most often due to increased cardiac muscle mass.
- The voltage in the three standard leads is measured from the peak of R wave to the bottom of S wave = 0.5 – 2.0 millivolts
- Highest voltage is in lead II, lowest in lead III.