Heart Blocks Explained - First, Second, Third Degree and Bundle Branch on ECG
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- Опубліковано 5 лют 2025
- Heart blocks illustrated clearly with Dr. Seheult. See the other videos in this ECG Interpretation series at: www.medcram.co...
This video includes 1st degree heart blocks, 2nd degree heart blocks (Mobitz type 1 or wenckebach, mobitz type 2), 3rd degree heart blocks (complete heart block), hemiblocks, bundle branch blocks, 2:1 heart block, and more. Also, learn the pathophysiology of heart blocks as they relate to the SA node, AV node, ventricles, and atrium.
See the complete ECG Interpretation course. Confidently interpret EKGs and EKG rhythms in a systematic way, including:
The physiology of the heart
EKG leads and vectors
Leads and EKG paper
The ECG tracing
EKG waves, complexes, and intervals (p waves, QRS complexes, PR interval etc.)
Axis on EKG and precordial leads
The autonomic nervous system and the heart
Heart rate and automaticity on the ECG
The R to R interval
Rhythm, arrhythmias, and escape rhythms,
Premature beats and pauses on EKG
Bigeminy, trigeminy, and tachyarrhythmias
V-tach and torsades de points
Atrial and ventricular flutter
Atrial fibrillation and ventricular fibrillation on ECG
Heart blocks and escape rhythms (1st, 2nd, and 3rd degree heart block)
Bundle branch blocks, hemiblocks, and fascicular blocks
Hypertrophy (LVH) and atrial enlargement
COPD, PE, Hyperkalemia, Digoxin and the EKG
How to systematically read an EKG (and what a normal ECG looks like)
Many practice EKG (that Dr. Seheult interprets step by step)
EKG quizzes follow each video.
This video is part of the "MedCram Remastered" series: A video we've re-edited & sped up to make learning even more efficient.
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Most of our medical lectures and quizzes are not on UA-cam.
Speaker: Roger Seheult, MD
Co-Founder of MedCram.com
Clinical and Exam Preparation Instructor
Board Certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine.
MedCram = More understanding in less time
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Recommended Audience - Medical professionals and medical students including physicians, nurse practitioners, physician assistants, nurses, respiratory therapists, EMT and paramedics, and many others. Review and test prep for USMLE, MCAT, PANCE, NCLEX, NAPLEX, NBDE, RN, RT, MD, DO, PA, NP school and board examinations.
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Thanks for watching and subscribing. See the rest of the ECG video series at www.medcram.com/courses/ekg-ecg-interpretation-explained-clearly
Compared to other tutorials, I find that EXTREMELY helpful because of the way it is taught here.
I dont say this often byut you explain phenomenally!!
Came across this video while studying for my EKG practical exam. Was curious about your page and figured out you went to the medical school I currently attend. So cool! Thank you!
You are awesome. Explained in a way that was not taught in school.
Helps you a lot with 1 and 2 blocks, 3 and other missing though. Very interesting, thanks for sharing.
Thank you very much for this lecture. You explain concepts so well. I'm watching this on loop as I prepare for the CVRN-BC exam
Glad it was helpful!
I swear ur the most amazing explanation ever , I totally searched a way to understand this by many videos and even by my own academic professor, still couldn't get it except by u , tysm ❤❤❤
I just got diagnosed with Wenckebach. My doctor couldn't tell me things like if this will progress to Third Degree Heart Block, if I'll need a pacemaker, or if if this will shorten my lifespan. I'm 28.
So thank you for explaining this. I feel better the more I hear that this condition doesn't usually worsen.
I'm still seeing a cardiologist, but it could be a while.
The explanation is phenomenal, thank you for that.
But the title of the video and the description is extremely misleading. This video DOES NOT cover 3rd degree AV blocks, BBB, or hemiblocks.
Dr Sehult, your description is excellent. Can you kindly make the pointer more prominent bcz I was struggling to locate the pointer. Thank you .
Very good presentation. Watching this feeling concerned here. Last week I had a high resting heart rate that didn’t settle down for a few hours and for some time was in the 125-145 bpm range. I saw my doctor today and was sent for an EKG. Result was just posted online, stating type 1 AV block and otherwise normal EKG. I’ve had a crazy stressful 6 months at work, with working basically 12 hours/day for the last 3 months. All very fast paced corporate environment. Been eating poorly and no exercise in 3 months. I’m sure my doctor will call me in the morning (and had already ordered a 24-hour holter), but have some questions: (I am 46F) 1) Is this something that can go away? 2) How is it treated? 3) Can this be caused by stress? 4) Is there an actual blockage that would require a stent? 5) Can I continue exercising? I love to go to the mountains to hike and kayak, but those are areas with no cell phone reception. Would this make me have to stay nearer the city? 6) What percentage of 1st degree AV blocks progress to become worse? EKG results: HR 53, P axis 38 degrees, QRS axis 21 degrees, T axis 17 degrees, QT 485 ms, QTC 473 ms, QTD no value, QRS complexes 90 ms, PR 0 ms, PQ 211 ms, P 102 ms.
Wow, your lectures are really informative. They really encourage me to make more videos for Medical students on my channel. Def subscribing
This is SO helpful! Thank you so much for sharing your videos. They have saved me many times over.
You’re welcome👍
Excellent video! But can't find the link for 3rd degree explanation
thank you bro it really halped
As simple as it sounded, imagine wraping the 12 lead around the heart to get a sense of where possibly the cardiovascular problem may be!
Excellent lecture Dr. Seheult!
Brilliant explanation
Whether or not u just saved my life idk.
I have kardia device and I'm having pulsating chest pains so u recorded a 6 lead and it went from 4 boxes to a 2 boxes times 3 and back to normal. Not one little box but big boxes.
Earlier i wasn't able to detect the exact heart block now i can even write the type precisely
Great video thanks Dr Seheult.
what happened to the continuation of the explanation of the cell?? (went from video 1 to video2 in the playlist, & it jumped from cell & polarization to heart blocks).... 🤔
I can't seem to find the video on 3rd degree heart block....
Great in depth video! I learned a lot. Thabk you 👍🔥
Very much information
Very helpful and informative. Thanks a lot.
I am 45 years old male, having bifasicular block since last 6 years, having no syncopy ever since, plz give me suggestions so that I cannot need pacer in future
Excellent explanation 👌
Much appreciated your effort.. keep up the greatness✌
Hello I know this is a little old but I need some reassurance. I'm a 37 year old female and out of nowhere 3 days ago I ended up being taken by ambulance to hospital. I had a really bad turn out of the blue. I went dizzy, hot, pale, my heart was racing, I was lethargic, my speech was drowsy and I felt drowsy, I had a weird sensation in my face and neck and generally felt awful. I had an ECG on the way to hospital & it turns out I had a left bunch branch block. As I understand it usually blocks don't present themselves with symptoms, and if they do it suggests an underlying heart condition. I'm also aware it's more serious to get these blocks on the left but not so serious in the right. I just want to know can blocks by themselves kill you? I have such bad anxiety about this. I'm scared its going to happen again. I have a heart scan soon but I just need some reassurance that I'm not in danger. Thank you.
Thank you sir,you writting it on my mind clearly
👍👍. thanks, very well done!
Where is video on third degree block?
Excellent presentation, thank you, 👍👍
Has anyone ever come across only 1 PR lengthening then a missed QRS? Mobitz 1 or 2? Aware mobitz 1 is usually multiple PR lengthenings before the missed QRS and Mobitz 2 is zero lengthenings prior so it doesn’t seem to fit into either? Happens to me several times every night when sleeping but ECG is neat all day long, scared this could be Mobitz 2 and I’m not on a pacemaker though!
Beautifully explained! Thank you @MedCram-Medical Lectures
Thanks!
Great content!
Thank you!
I do not know why am I so dumb. It takes me time to understand a particular thing or concept. I am feeling so down,discouraged and upset.
Thanks so much for sharing. 💔 😉👌🏻
good explaination, thanks Doc
Hi sir.. in ecg report came. Incomplete right bundle branch block. Is that dangerous... pls reply soon
Please how can i do the parasympathetic stimulation
Thank u ♥️
You the man
Sir, how does the valsalva increase the cycles number??
Thanks for the video it's incredibly helpful. Only thing I was confused about .... @10:47 I think you meant PRs are becoming longer in length as opposed to QRSs ? Or am I wrong?
sherbetstraw yes I believe you’re right. The PRi gets longer.
It was the box that did it for me
Please show 3 rd degree, bundle branch blocks
Very lucid. Thanks!
Thanks for your feedback
What about incomplete Rbbb
with the SA node block you state there should be no P-wave and then go and point out the P-wave on the EKG i am confused
Doctor please questions I just had open heart surgery for aorta and valve reconstruction. it's been a month now I am 41yrs old and I have complication in my heart rate and rhythm so doctor give me medications metoprolol tartrate 75mg a day 25 mg 3x a day. And amiodarone hydrochloride 200mg 2x a day. Lengout 500mcg 2x a day, Eliquis 5mg 2x a day. Please questions how long I be taken this in your opinion and what should I been watching in my self to help to be normal and be stop with medications. Please help. And thank you do much.
Why do you only answer comments that thank you for your lecture?
Thank u so much
Thank you so much 🙏🏻
Thanks for the comment!
Q: Why we cannot see P repolarization wave when QRS complex is dropped? Thank you.
Could you please share what software do you use to make these videos? The videos are very helpful. Thank you.
where is the next lecture to this one?
why do we do vagal maneuvers in mobitz type 1 although its harmful?
To kill the patient? Haha
I was tought to measure the pq time in stead of pr time.
i am consfused. you said because the PR interval is getting longer as the block in AV gets worse the QRS gets narrowers but then on the ECG exaple you said QRS is normal. please can you help me on this
Normal is narrow.
It means there isn't any widening like in type 2
Great
Can you focus on the healing process, what medicines to stay away from ect
Use a better pointer so can be seen easier.
👍
I am not asking for a diagnosis, just some advice. I am 68, 5’11”, workout regularly, eat clean. For the past 15 years or so, a couple of times a week my my heart rate increases from the high forties (resting) to the high 130’s for a few seconds, then stops for about 2 full seconds and resets to the normal rate. Anyone have any idea what, if anything, I should do?
Call your doctor.
taylorforester88 I talked to him a couple of times about it. He said medicare wouldn’t pay for a pacemaker until it got worse. Probable need a new dr. Thanks.
That P wave said 😐
Useless this is not the process to describe justs by describing with ecg.
Great effort
Good effort
Of course theres a paywall. Lost my like