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 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.
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.
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.
In Germany we do say PQ-Time for the intervall starting from the Beginning of the P wave (involving the P-Wave) and ending with the start of the QRS-Complex. Its much more intuitive..
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.
@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.
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, 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.
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.
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.
Sorry, should be "P wave". I previously had an annotation pop up at that moment in the video with a correction, but UA-cam 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!)
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
dont know if anyone has pointed this out yet but i was watching and i just now noticed the letters follow the normal alphabet.
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.
Your work is awesome Doctor ! God bless you. Big thanks 🙏🙏
Thank you so much for making very clearly explained videos and sharing it with us
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.
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).
Beautifully explained.
Thank you.
Thank you very much for a well explicit lecture
i love your lectures
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 so much for your efforts
Very helpful and very much appreciated
Priceless information, thank you!
Very very useful lecture... I'll be very grateful to you, sir
Great videos dr much appreciated
Hey Dr. Eric,
All your videos are really good. Thanks
In Germany we do say PQ-Time for the intervall starting from the Beginning of the P wave (involving the P-Wave) and ending with the start of the QRS-Complex. Its much more intuitive..
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 very much! Very helpful and easy to understand! Love your channel, will try to watch all videos :))
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.
@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.
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!
Is it possible to get the pdf of the lectures here. The whole series or at least the ecgs shown here. For revision
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 😊
Brilliant lecture
Thank you so much Dr Eric. However, is there any chance that i can assess the lecture notes? Cheers
Dr. Eric, thanks for your videos!.-
Nice work....تم التحميل
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.
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.
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.
In German we name the PR segment as “PQ segment” 😅
What I always look at is rate, rhythm, anything that could lead to thinking oh STEMI such as ST elevation.
If q and s wave found very negative then what happens?
Hi are there slides available for the EKG and CXR lectures thanks.
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 UA-cam 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!
8110 sinus rhythm means??
Great for ACLS prep... thanks.
I wasn't getting in all books they are telling PR interval as PQ interval
QRS complex nomenclature not explained clearly.Dr Najeeb has done a great job explaining it
love these video
This is amazing. Very helpful
I also thought about why PR, not PQ ...... I think it is called PR, because their are not always Q waves
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
Thanks for this video
I understood everything! Nice video.
thaaaaanks for this lecture
7:49 INTERVALS
PR = 0.12 to 0.20 seconds
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
Thanks dr
Great presentation. Thank you
so useful！！！！！ thanks ！！！！！
useful for me thanks doctor
Amazing
I have a test today on this...UGH
great
Thanks a lot
thank you!!!!
Thanks
yes
excellent
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.
Nice work..تم التحميل
Thanks a lot
Thanks
Thanks
Thanks
Thanks