Thank you Dr Strong. I learn something more each time I re listen to your lecture. You are an excellent teacher. My mind wander to the first lecturer, that she did not miss out anything but it is me who didn’t absorb it besides that was not a time , that one can review like nowadays, it was chalk and blackboard then.
Fantastic video, and series! Thank you so very much!. Although I'm sure somebody answered it down below, you stated in the video that you didn't know why the PR segment was not called the PQ segment, which makes more sense. It's because the Q wave is quite often not present, and the first thing you see is the R wave; therefore, it has been given the name the PR segment. This is also why it's called the PR interval and not the PQ interval. Source: Guyton and Hall textbook of medical physiology.
Can you help me please?i wana asking you that what very very very short q wave means in ekg ?is it good or not good and it means a heart pronlem?because in my newest ekg i saw that my q was very very very smal .what dose it mean?i had heared that if q cacomes longer it means heart works worse and if q becomes shorter it means heart is working better?is it true?
@@bhfi3801 the q wave represents septal depolarization. it isn't that big of an electrical event and thats why it may not be shown at all or very small in most leads
5:46 If I remember correctly it was called PR segment and not PQ segment because of convention; the convention itself was based upon the fact that some persons' ECGs didn't show a Q wave when an ECG was performed (and since they still had to generalize at a certain point, they called it PR segment).
I have always thought of the R-R interval as the measure from the peak of the R wave to the next R wave peak. I guess it doesn't really matter where you measure it since all you are in effect doing is measuring the ventricular rate.
Really well done, thanks! The only thing I would have found helpful would be to add the block count when talking about interval duration. 120ms / 3 blocks, 200ms one big block, etc.
Hi SM, I have a question as a pre-med. At 2:18 we hear that a long QRS complex could indicate a conduction block in RBB or LBB. We also hear that a tall QRS is ventricular hypertrophy. At 8:30 we see the table and it indicates that a long QRS is ventricular depolarization problem OR excessive ventricular mass. In my mind, "ventricular depolarization problem" sounds like a RBBB or LBBB, while "excessive ventricular mass" seems to indicate ventricular hypertrophy. So I know I must be confused somehow about the vocabulary and was wondering if you could educate me.
Great video! One erratum: when you refer to QT interval, you mention it can be dependent heart rate or "gender," you mean sex here! Gender refers to socially constructed characteristics, whereas sex refers to biological characteristics. Thanks again for the video! Cheers!
Thank you for the clarification. This video was posted 8 years ago when people more commonly (though still incorrectly) used gender and sex interchangeably, and I personally didn't consider such issues as much as I should have. Unfortunately there is no way to go back and edit that one line.
Dr Eric, what do you think of Dubin's EKG textbook. I suck at EKGs and I've been putting it off for a year now but residency starts soon and I need to catch up
Good book. The earlier versions, in my opinion were much better, though. I personally don't care for the most recent version, which is what I obtained recently for the purpose of tutoring. I lost my old book somewhere along the way since I no longer work in critical care. Lent it to someone I think, and never got it back. Didn't need it again til recently.
Dr.eric, thank you for these amazing videos, i really appreciate your efforts, i have a question, as the QRS duration is delayed during excessive ventricular mass, and knowing that QRS is a part of interval QT, isn't right that this excessive ventricular mass could delay the QT interval in addition to the repolariztion defect ??
+m7md-z- Yes, you are correct. For mild QRS prolongation, sometimes cardiologists measure the JT interval (time from the J point to the end of the T wave), although I don't know if the normal range isn't quite as well established or accepted. This will be addressed in a forthcoming (at some point in the next 6ish months...) video on QT prolongation.
There must be some international variability on the terminology. In the US, I've literally never once heard someone refer to the PQ segment or PQ interval. To be sure I wasn't naive about this, I just asked an EP in the next room who confirmed.
@4:10 how do you decide the difference between a Qr and a RS type QRS complex? the first deflection in a Qr is a Q wave; yet the first deflection in a RS is a R wave? how so?
The first positive deflection is an r/R wave. If there is anything before the r/R, it's called a q/Q wave. If there is anything after the r/R, it's called an s/S wave.
The PR segment is the line between the *end* of the P wave and the beginning of the QRS complex (whether it's a q or an r). The PR interval is the duration of time from the *beginning* of the P wave to the beginning of the QRS.
I know this is cliche, but it is even more true of learning ECGs than most topics: You need to learn by practicing. Watching videos or reading textbooks is a necessary foundation, but until you've actually tried to reading 100+ ECGs on your own, it will be hard to recognize abnormalities (even if you've memorized specific criteria).
Sorry, should be "P wave". I previously had an annotation pop up at that moment in the video with a correction, but CZcams scrapped annotations 1-2 years ago, and I didn't remember to pin a comment with the correction in its place. Thanks for pointing out the error!
It's probably called the PR segment because the Q wave is not always present Edit: Yeah I commented before realising 200 other people already said this... My bad
I'm not sure what exactly your objection is, but I do read from a script for most of my videos. Reading from a script reduces the number of misspeaks, cuts out annoying "umms", and generally conveys the information more concisely than if talking off the cuff. However, I do write 100% of the scripts myself, and as I teach EKG interpretation at the Stanford School of Medicine, I would say yes, I do know what I'm saying. I also speak more slowly and deliberately than I would in person because ~25% of my viewers and subscribers come from countries in which English is not the primary language.
Erratum: @7:07, "PR wave" should be "P wave". (a typo followed by me mindlessly reading off the slide while too tired to catch it!)
Thank you Dr Strong. I learn something more each time I re listen to your lecture. You are an excellent teacher. My mind wander to the first lecturer, that she did not miss out anything but it is me who didn’t absorb it besides that was not a time , that one can review like nowadays, it was chalk and blackboard then.
Priceless information, thank you!
Your work is awesome Doctor ! God bless you. Big thanks 🙏🙏
dont know if anyone has pointed this out yet but i was watching and i just now noticed the letters follow the normal alphabet.
Dr. Eric, thanks for your videos!.-
Fantastic video, and series! Thank you so very much!.
Although I'm sure somebody answered it down below, you stated in the video that you didn't know why the PR segment was not called the PQ segment, which makes more sense. It's because the Q wave is quite often not present, and the first thing you see is the R wave; therefore, it has been given the name the PR segment. This is also why it's called the PR interval and not the PQ interval.
Source: Guyton and Hall textbook of medical physiology.
Can you help me please?i wana asking you that what very very very short q wave means in ekg ?is it good or not good and it means a heart pronlem?because in my newest ekg i saw that my q was very very very smal .what dose it mean?i had heared that if q cacomes longer it means heart works worse and if q becomes shorter it means heart is working better?is it true?
@@bhfi3801 the q wave represents septal depolarization. it isn't that big of an electrical event and thats why it may not be shown at all or very small in most leads
Thank you so much for making very clearly explained videos and sharing it with us
Thank you very much! Very helpful and easy to understand! Love your channel, will try to watch all videos :))
Beautifully explained.
Thank you.
Very very useful lecture... I'll be very grateful to you, sir
Thank you very much for a well explicit lecture
Hey Dr. Eric,
All your videos are really good. Thanks
Thanks so much for your efforts
Very helpful and very much appreciated
Great for ACLS prep... thanks.
Great videos dr much appreciated
i love your lectures
Brilliant lecture
This is amazing. Very helpful
love these video
5:46 If I remember correctly it was called PR segment and not PQ segment because of convention; the convention itself was based upon the fact that some persons' ECGs didn't show a Q wave when an ECG was performed (and since they still had to generalize at a certain point, they called it PR segment).
I have always thought of the R-R interval as the measure from the peak of the R wave to the next R wave peak. I guess it doesn't really matter where you measure it since all you are in effect doing is measuring the ventricular rate.
Thanks for this video
Really well done, thanks! The only thing I would have found helpful would be to add the block count when talking about interval duration. 120ms / 3 blocks, 200ms one big block, etc.
Thank you so much Dr Eric. However, is there any chance that i can assess the lecture notes? Cheers
Great presentation. Thank you
Thanks, man. Navy hospital corpsman here just trying to not be ignorant of heart pumpy stuffs. This def helps.
Amazing
thank you!!!!
thaaaaanks for this lecture
Hi SM,
I have a question as a pre-med. At 2:18 we hear that a long QRS complex could indicate a conduction block in RBB or LBB. We also hear that a tall QRS is ventricular hypertrophy. At 8:30 we see the table and it indicates that a long QRS is ventricular depolarization problem OR excessive ventricular mass. In my mind, "ventricular depolarization problem" sounds like a RBBB or LBBB, while "excessive ventricular mass" seems to indicate ventricular hypertrophy. So I know I must be confused somehow about the vocabulary and was wondering if you could educate me.
Thanks
Thanks a lot
Nice work..تم التحميل
I understood everything! Nice video.
Great video! One erratum: when you refer to QT interval, you mention it can be dependent heart rate or "gender," you mean sex here! Gender refers to socially constructed characteristics, whereas sex refers to biological characteristics. Thanks again for the video! Cheers!
Thank you for the clarification. This video was posted 8 years ago when people more commonly (though still incorrectly) used gender and sex interchangeably, and I personally didn't consider such issues as much as I should have. Unfortunately there is no way to go back and edit that one line.
@@StrongMedI guess we need to change a lot in med books, research ,videos …. SARCASM 😊
useful for me thanks doctor
so useful！！！！！ thanks ！！！！！
Dr Eric, what do you think of Dubin's EKG textbook. I suck at EKGs and I've been putting it off for a year now but residency starts soon and I need to catch up
Good book. The earlier versions, in my opinion were much better, though. I personally don't care for the most recent version, which is what I obtained recently for the purpose of tutoring. I lost my old book somewhere along the way since I no longer work in critical care. Lent it to someone I think, and never got it back. Didn't need it again til recently.
Hi are there slides available for the EKG and CXR lectures thanks.
Thanks dr
Dr.eric, thank you for these amazing videos, i really appreciate your efforts, i have a question,
as the QRS duration is delayed during excessive ventricular mass, and knowing that QRS is a part of interval QT, isn't right that this excessive ventricular mass could delay the QT interval in addition to the repolariztion defect ??
+m7md-z- Yes, you are correct. For mild QRS prolongation, sometimes cardiologists measure the JT interval (time from the J point to the end of the T wave), although I don't know if the normal range isn't quite as well established or accepted. This will be addressed in a forthcoming (at some point in the next 6ish months...) video on QT prolongation.
thank you very much Dr.eric.
This is pure gold.
What I always look at is rate, rhythm, anything that could lead to thinking oh STEMI such as ST elevation.
yes
Is it possible that they called it PR segment instead of PQ segment because Q wave are not present in all leads ?!
Aladdin Alswaifi Seems like a good explanation to me!
At 5:35. The segment is called P-Q. ONLY in the absence of the R wave is it called P-R.
There must be some international variability on the terminology. In the US, I've literally never once heard someone refer to the PQ segment or PQ interval. To be sure I wasn't naive about this, I just asked an EP in the next room who confirmed.
In German we name the PR segment as “PQ segment” 😅
did we have tp interval?abyone can help me
@4:10 how do you decide the difference between a Qr and a RS type QRS complex?
the first deflection in a Qr is a Q wave; yet the first deflection in a RS is a R wave?
how so?
The first positive deflection is an r/R wave. If there is anything before the r/R, it's called a q/Q wave. If there is anything after the r/R, it's called an s/S wave.
If q and s wave found very negative then what happens?
excellent
Doesn't the PR segment start before the P wave same ending point?
The PR segment is the line between the *end* of the P wave and the beginning of the QRS complex (whether it's a q or an r). The PR interval is the duration of time from the *beginning* of the P wave to the beginning of the QRS.
I also thought about why PR, not PQ ...... I think it is called PR, because their are not always Q waves
I have a test today on this...UGH
I cannot remember and understand ECG if my life depended on it. What's the easiest way of studying it
I know this is cliche, but it is even more true of learning ECGs than most topics: You need to learn by practicing. Watching videos or reading textbooks is a necessary foundation, but until you've actually tried to reading 100+ ECGs on your own, it will be hard to recognize abnormalities (even if you've memorized specific criteria).
8110 sinus rhythm means??
QRS complex nomenclature not explained clearly.Dr Najeeb has done a great job explaining it
I wasn't getting in all books they are telling PR interval as PQ interval
Hello sir. What is PR wave at 7:07?
Sorry, should be "P wave". I previously had an annotation pop up at that moment in the video with a correction, but CZcams scrapped annotations 1-2 years ago, and I didn't remember to pin a comment with the correction in its place. Thanks for pointing out the error!
@@StrongMed Of course... Thanks for quick reply and actions. Thank you also for great instructional videos. Greetings from Serbia!
I thought the occurrence of a U wave was due to electrolyte imbalance. that's what I was taught in school.
Queen V yup its due to excess of k+ ions
Never heard of that before but thanks for sharing your knowledge
It's probably called the PR segment because the Q wave is not always present
Edit: Yeah I commented before realising 200 other people already said this... My bad
7:49 INTERVALS
PR = 0.12 to 0.20 seconds
Speak louder, your voice please
I’d hang it up if I were you. Your reading a script. Do you even know what your saying?
I'm not sure what exactly your objection is, but I do read from a script for most of my videos. Reading from a script reduces the number of misspeaks, cuts out annoying "umms", and generally conveys the information more concisely than if talking off the cuff. However, I do write 100% of the scripts myself, and as I teach EKG interpretation at the Stanford School of Medicine, I would say yes, I do know what I'm saying. I also speak more slowly and deliberately than I would in person because ~25% of my viewers and subscribers come from countries in which English is not the primary language.
Eric Erickson, you must be a troll. This Doctor is doing excellent work, and 1st class tutorials.
Thanks a lot
Thanks
Nice work....تم التحميل
Thanks
Thanks
Thanks