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08-26-2005, 09:00 PM
if QRS complex is positive in lead 2 and avf and negative in lead 3 what is the mean electrical axis between
a . -30 and 0
b. 0 and 30
c. 30 and 60
d. 60 and 90
e. 90 and 120
can someone please tell the answer and explain it

08-31-2005, 03:28 AM
I know the method of fast determining mean electrical axis by using lead 1, V2 and aVF. If you want me to explain it, tell me.

08-31-2005, 04:04 AM
And, about your question,
I would say between 0 and 60.
I draw a diagram i.e. a circle showing all three standard leads (1,2,3) and aVF (something between EKG three-axis and six-axis system, I don't know if you understand what I am trying to say). Then I mark area of the circle where mean electrical axis (MEA) can be if lead 2 is positive, then the same thing for lead 3 being negative, and the same procedure for aVF being positive. Intersected area is between 0 and 60.
The problem is that there is not such a result offered in the question, but this is what I get by way of drawing it as I have described above. What do you think?

08-31-2005, 12:40 PM
I would say that the answer is d) between 60 and 90

Please see the attached document on the mean axises of depolarization.

08-31-2005, 06:45 PM
actually none of the answers are correct. If lead II is positive and lead III is negative..that gives a range between -30 and +30 degrees and that gives you a MEAN ELECTRICAL AXIS of 0 degrees.

Hope this helps

09-01-2005, 12:01 PM
I have to correct myself. The answer is 0 to 30

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