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Examine the six extremity leads shown in the figure below. What is the appropriate mean QRS axis?
Suggested Answer: B
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34 comments · newest first
BR
Brynn
10 months ago
I’m surprised it’s not 120, that’s usually a common guess!
NA
Nakisha
11 months ago
I thought it could be 90, but 60 makes sense too.
LA
Lawrence
11 months ago
Wait, are we sure it's not -30? That seems off.
BR
Brock
11 months ago
Definitely agree, 60 seems right!
MA
Margart
11 months ago
I think the mean QRS axis is around 60.
MI
Mike
12 months ago
I recall that the mean QRS axis can vary, but I think I ruled out -30. I’m stuck between 60 and 90.
SA
Samuel
12 months ago
I feel like I should be able to calculate this, but the angles are throwing me off. Was it 60 or 90 degrees?
MA
Margery
12 months ago
I think I saw a similar question in our review session. I might lean towards option B, but I’m not completely confident.
EV
Evangelina
1 year ago
I remember practicing QRS axis determination, but I’m not sure how to apply it to these leads.
TO
Toshia
1 year ago
Ugh, I'm not sure I'm confident in my ability to solve this. I better take my time and work through it step-by-step.
BU
Bulah
1 year ago
No problem, I've got this. Determining the QRS axis is a straightforward process, I just need to apply it correctly.
SH
Sharita
1 year ago
Wait, I'm a little confused on how to approach this. I better review my notes on interpreting ECG leads.
VI
Vi
1 year ago
Okay, I think I can handle this. I just need to remember the steps for determining the mean QRS axis.
KA
Katlyn
1 year ago
Hmm, this looks like a tricky one. I'll need to carefully examine the leads and think through the axis calculation.
QU
Queen
2 years ago
I agree with Theron, -30 seems to be the most appropriate mean QRS axis.
TY
Tyra
2 years ago
Wow, I guess the electrical activity in the heart is just going in circles or something. 120 degrees? That's like a ninja move, not an ECG reading!
GA
Gail
2 years ago
I'm a little confused here. Is the question asking about the mean QRS axis or the mean axis of the entire ECG? That could make a difference in the answer.
AL
Aliza
1 year ago
B) 60.
JO
Joana
1 year ago
I think it's asking about the mean QRS axis specifically.
CR
Cristal
1 year ago
B) 60.
AD
Adelle
1 year ago
I think it's asking about the mean QRS axis specifically.
KE
Kelvin
1 year ago
A) -30.
WI
Wilbert
1 year ago
A) -30.
TH
Theron
2 years ago
Well, based on the extremity leads shown in the figure, I think -30 makes more sense.
BR
Brande
2 years ago
90 degrees? Really? That would be a vertical axis, and the leads don't look like that at all. I'm going with 60 degrees.
FL
Florencia
2 years ago
Why do you think it's -30? Can you explain your reasoning?
DO
Donte
2 years ago
Hmm, I'm not sure about this one. The leads seem to be showing a left-axis deviation, so I think the answer might be -30 degrees.
TH
Theron
2 years ago
I disagree, I believe it is -30.
ER
Ernestine
2 years ago
The mean QRS axis is clearly 60 degrees. This is the only option that aligns with the characteristic appearance of the extremity leads in the figure.
VI
Vincent
2 years ago
No, the extremity leads in the figure clearly point towards a mean QRS axis of 60 degrees.
AL
Alaine
2 years ago
What about option A) -30? Could that be a possibility?
LE
Lemuel
2 years ago
I agree, option B) 60 seems to be the correct choice.
SH
Shawnna
2 years ago
I think the mean QRS axis is 60 degrees.
FL
Florencia
2 years ago
I think the appropriate mean QRS axis is 90.