Question
The ECG of a 40 year old male was recorded using standard bipolar limb leads. The sum of voltage of the three standard leads was found to be 5 millivolts. This indicates:
| A. |
A normal heart
|
| B. |
Right ventricular hypertrophy
|
| C. |
Left ventricular hypertrophy
|
| D. |
Increased cardiac muscle mass
|
Show Answer
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Correct Answer � D
Explanation
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|
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.
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