Interesting. Good on you for having a passion for ECG. It is very difficult to have a thorough grasp of interpretation. One controversy you would do well to read up on is the confounders of the isoelectric baseline. The baseline is generally considered to be the end of the PR segment, just prior to the Q wave formation.
@@sherlynhii4382 I just wrote a reply with references, but youtube's algo appears to be aggressively censorious these days....and my reply seems to have vanished. I will send again in the next few days if it doesn't show up...
Can you explain why the degrees are switched? Why is the -90 degrees at the top and the positive one at the bottom? I am currently learning about ECGs and I stumbled across your video. Thank you in advance.
Hey Alexa, that is a great question! I'm not really sure but if I were a betting gal, I'd say that they have made 6 o'clock position 90 degrees because it makes more sense to refer to the normal cardiac axis starting at point zero. In a normal heart, the pattern of depolarisation follows a roughly south-easternly direction as the impulse travels from the sino-atrial node, towards the purjinke fibres. Because this is the default range, it is simpler to say that true east is 0° and true south is 90°. Interestingly I have not seen a version of the cardiac axis which describes the 12 o'clock position as positive 90° and 6 o'clock position as negative 90°. Where had you seen that? Sorry I couldn't offer up a better answer. I hope that was kind of useful. If anyone else has any ideas I'd be keen to hear also.
According to my understanding. We took a perpendicular line to map out cardiac axis and for that any perpendicular line will be 0 degree at the right. So yeah up right will be -90 and below is +90.
@@sherlynhii4382 Hello! I don't know why RUclips works so bad, because only now that you hearted my comment I got a notification for your reply. Thank you for trying to explain. Well, in my physiology class, our teacher drew those 90, -90 degrees (like you also did here) but my question was more towards the idea, why are the degrees not switched like in math, where if you go anti clock wise, starting from 0, the top 90, would be positive. I know I asked the reason for that, but even then I couldn't understand why it is like that.
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I love this! now i can really understand em!
Interesting. Good on you for having a passion for ECG.
It is very difficult to have a thorough grasp of interpretation.
One controversy you would do well to read up on is the confounders of the isoelectric baseline.
The baseline is generally considered to be the end of the PR segment, just prior to the Q wave formation.
Hey thanks for the tip helicart. I will check that out. Do you have any good source material that you'd recommend?
@@sherlynhii4382
I just wrote a reply with references, but youtube's algo appears to be aggressively censorious these days....and my reply seems to have vanished.
I will send again in the next few days if it doesn't show up...
@@sherlynhii4382
A little long winded but the boys have done a good job here.
ruclips.net/video/vSrW4jg8Zq8/видео.html
Can you explain why the degrees are switched? Why is the -90 degrees at the top and the positive one at the bottom? I am currently learning about ECGs and I stumbled across your video. Thank you in advance.
Hey Alexa, that is a great question! I'm not really sure but if I were a betting gal, I'd say that they have made 6 o'clock position 90 degrees because it makes more sense to refer to the normal cardiac axis starting at point zero.
In a normal heart, the pattern of depolarisation follows a roughly south-easternly direction as the impulse travels from the sino-atrial node, towards the purjinke fibres. Because this is the default range, it is simpler to say that true east is 0° and true south is 90°.
Interestingly I have not seen a version of the cardiac axis which describes the 12 o'clock position as positive 90° and 6 o'clock position as negative 90°. Where had you seen that?
Sorry I couldn't offer up a better answer. I hope that was kind of useful. If anyone else has any ideas I'd be keen to hear also.
According to my understanding.
We took a perpendicular line to map out cardiac axis and for that any perpendicular line will be 0 degree at the right.
So yeah up right will be -90 and below is +90.
@@sherlynhii4382 Hello! I don't know why RUclips works so bad, because only now that you hearted my comment I got a notification for your reply. Thank you for trying to explain. Well, in my physiology class, our teacher drew those 90, -90 degrees (like you also did here) but my question was more towards the idea, why are the degrees not switched like in math, where if you go anti clock wise, starting from 0, the top 90, would be positive. I know I asked the reason for that, but even then I couldn't understand why it is like that.