Physiology of ST Segment Elevation and Depression Explained

This video will go over the basic physiology of ST segment elevations and ST segment depressions and why they occur in the setting of myocardial ischemia and infarctions (STEMI/NSTEMI).
*Correction: Criteria for ST Depressions are depressions greater than 0.5mm
Time Stamps:
00:00 Intro
00:35 ST Change Criteria & J-Point
05:09 ST Segment Depression
05:41 Sub-endocardial Ischemia
14:42 Normal vs ST Depression
16:52 ST Segment Elevation
17:36 Transmural Ischemia
19:25 Normal vs ST Elevation
#STEMI #ECG #MedRounds101
If you would like to view a video on ECG basics, you can find that here:
• Beginner's Guide to EC...

Пікірлер: 42

  • @dilaozut
    @dilaozut2 күн бұрын

    finally someone showed me this way why no one talks about the phsiology behind

  • @ahmedelsabe6542
    @ahmedelsabe65422 күн бұрын

    Finally someone who explained it simply!! Thank You!

  • @brandtrh3977
    @brandtrh39772 ай бұрын

    I never take the time to comment on any videos, but this was exceptionally succinct and easy to follow. So glad for teachers like you, bravo!!

  • @medrounds101

    @medrounds101

    2 ай бұрын

    So kind of you :) I'm glad you found the video useful!

  • @yahiamohamed1211
    @yahiamohamed12112 ай бұрын

    At last I understood THANK YOU from deep heart

  • @mohammad.s2393
    @mohammad.s23937 ай бұрын

    Wooow! Couldn’t be explained better! Thanks

  • @ajanannamalai1443
    @ajanannamalai144310 ай бұрын

    Thank you so muchhhh. Honestly made my whole understanding of cardio better!

  • @medrounds101

    @medrounds101

    10 ай бұрын

    I'm glad you found it helpful :)

  • @sajjadmahmudrozin2828
    @sajjadmahmudrozin282811 ай бұрын

    No one like u taught like this way

  • @smithy280663
    @smithy280663 Жыл бұрын

    very well explained........many thanks.

  • @jazzbrar450
    @jazzbrar4503 ай бұрын

    wow !!! love how you explained it .

  • @debigdogk9563
    @debigdogk9563 Жыл бұрын

    GOATT.- Greatest Of All Time Teacher. Thank you thank you and thank you. God bless you for teaching ❤❤❤❤

  • @medrounds101

    @medrounds101

    Жыл бұрын

    Haha very kind of you. Much appreciated :)

  • @quur1915
    @quur1915 Жыл бұрын

    Thank you so much i've rlly searched for this kind of explanation and couldnt find it 🙏🏻❤️ god bless you brother

  • @medrounds101

    @medrounds101

    Жыл бұрын

    Really happy you found it useful!!

  • @georgen9755

    @georgen9755

    11 ай бұрын

    +

  • @Dana-rm8cs
    @Dana-rm8cs Жыл бұрын

    Very helpful

  • @cherrrriii
    @cherrrriii Жыл бұрын

    this is just amazing thank you TT

  • @aadityavishisht
    @aadityavishisht22 күн бұрын

    Phenomenal

  • @vittorpollux5042
    @vittorpollux50422 ай бұрын

    THANK YOU 1000 TIMES

  • @mohammadalisadeghi9068
    @mohammadalisadeghi9068 Жыл бұрын

    Thanks so much .

  • @dennisyu8711
    @dennisyu8711 Жыл бұрын

    thank you so much! finally makes sense

  • @medrounds101

    @medrounds101

    Жыл бұрын

    I'm glad it was helpful!! :)

  • @TheRandomGuy-fj7un
    @TheRandomGuy-fj7un7 ай бұрын

    underrated

  • @ahsanbhutta4896
    @ahsanbhutta4896 Жыл бұрын

    That was really helpful

  • @is44ct37
    @is44ct37 Жыл бұрын

    Absolute banger

  • @jayedhossain6336
    @jayedhossain63367 ай бұрын

    Fantastic.

  • @AhmedOsamaZayed
    @AhmedOsamaZayed Жыл бұрын

    Thank you ❤

  • @StyleshStorm
    @StyleshStorm10 ай бұрын

    Very well explained. Thank you so much. Such a underrated topic. Is ST Depression only upon one lays flat on their back a sign of anything?

  • @medrounds101

    @medrounds101

    10 ай бұрын

    Thank you so much! I'm not aware of a condition that would do that... if there is one, I'd love to hear about it!

  • @drgadham
    @drgadhamАй бұрын

    ❤teaching 👌🏼👌🌈

  • @melodiousmedico2165
    @melodiousmedico21653 ай бұрын

    Wow

  • @gerardtchinda7680
    @gerardtchinda7680 Жыл бұрын

    This is really excellent. thanks a lot.

  • @SourChip123
    @SourChip1239 ай бұрын

    What resource did you use to learn EKGs? This video was great and I'd love to know where you learned initially.

  • @medrounds101

    @medrounds101

    9 ай бұрын

    I've had some brilliant teachers and also happened to come across this, essentially, basics of cardiology book a while back that went though some concepts of electrophysiology and echocardiograms. It was in Japanese, and I can't quite remember to title at the moment but I'll come back to mention it if I find it. I have been recommended "The only EKG book you'll ever need" by Malcolm Thaler a lot but I personally have not had the opportunity to go through that yet.

  • @SourChip123

    @SourChip123

    9 ай бұрын

    ​@@medrounds101 I have a copy of that book I found online so ill definitely give that a look too. Thanks a bunch for this video and the response.

  • @lindsayallen4022
    @lindsayallen40227 ай бұрын

    This is fantastic. Can you explain reciprocal changes?

  • @medrounds101

    @medrounds101

    7 ай бұрын

    Yes! So to understand the concept of reciprocal changes, you'll have to be familiar with the direction (vector) that each of the leads are pointing to. In the video example at 19:35, the ECG wave drawn roughly represents what we would expect to see in lead II. If we were to take the same MI scenario but looked at how lead aVR (which roughly points in the opposite direction as Lead II) would have looked like, the ST segment would actually look like a depression since the constant "noise" that shifted the ECG wave downwards in lead II would have shifted the ECG wave upwards in lead aVR. The ST depression seen in aVR would be considered a reciprocal change to the ST elevation seen in lead II. Essentially reciprocal changes are ST depressions seen in the leads pointing in the opposite direction of the leads that have ST elevations. A real life example of a full-thickness inferior wall MI, the overall "noise" vector ends up being pointed away from the inferior (downward) pointing leads (II, III, aVF), so you see ST segment elevations in those inferior leads (II, III, aVF). Instead of looking at that overall "noise" vector as pointing AWAY from the INFERIOR direction, you can say that the "noise" vector is pointing TOWARD the SUPERIOR direction. Therefore the ECG waves in the leads pointing upwards in the SUPERIOR direction (I, aVL) will show ST depressions. You'll notice that lead I is not actually pointing downward (it's rather pointing horizontally) but still shows ST depression in this case since likely the "noise" vector in an inferior wall MI is pointing away from somewhere in between leads III and aVF (not exactly pointing downward 90 degrees). Hope that helps clear that up?

  • @agenziacentrale4383
    @agenziacentrale43838 ай бұрын

    ST elevation could also be early repolarization.

  • @medrounds101

    @medrounds101

    8 ай бұрын

    Very true!

  • @chrispeters5194
    @chrispeters5194 Жыл бұрын

    My ecg said mild st elevation and the ecg before that said poor r wave leads 2 and 3. Is this bad ?

  • @medrounds101

    @medrounds101

    Жыл бұрын

    Hi! I unfortunately can't really comment on that, and I'm definitely going to defer that to your physician. ECGs have to be interpreted along with the overall clinical picture, and unfortunately, it wouldn't be appropriate for me to give any evaluation (i.e. good, bad, etc) on your ECG.