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Cardiac Conduction System and Understanding ECG/EKG - Updated 2024, Animation
Cardiovascular Physiology. Electrical Conduction Through the Heart and How Different Segments and Waves of the EKG (ECG) are Generated.
This is an updated version of our hugely popular video of the same name.
Purchase a license to download a non-watermarked version of this video here: www.alilamedicalmedia.com/-/galleries/narrated-videos-by-topics/ekgecg/-/medias/e912233a-cfb5-11e3-bc90-329e81129ea7-cardiac-conduction-system-and-ecg-anatomy-narrated-video
Purchase PDF (video text + images) here: www.alilamedicalmedia.com/-/galleries/pdf-video-scripts-with-images/cardiology/-/medias/342aff65-93af-4005-86e6-c1f9987a5a9f-cardiac-conduction-system-3-pages-2-images
Check out our new Alila Academy - complete video courses with quizzes, PDFs, and downloadable images, here: www.alilaacademy.com/courses/
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©Alila Medical Media. All rights reserved.
Voice by Marty Henne
All images/videos by Alila Medical Media are for information purposes ONLY and are NOT intended to replace professional medical advice, diagnosis or treatment.
The cardiac conduction system consists of the following components:
- The sinoatrial node, or SA node, located in the right atrium near the entrance of the superior vena cava. This is the natural pacemaker of the heart. It initiates all heartbeat and determines heart rate. Electrical impulses from the SA node spread throughout both atria and stimulate them to contract.
- The atrioventricular node, or AV node, located on the other side of the right atrium, near the AV valve. The AV node serves as the electrical gateway to the ventricles. It delays the passage of electrical impulses to the ventricles, to ensure that the atria have ejected all the blood into the ventricles before the ventricles contract.
- The AV node receives signals from the SA node and passes them onto the atrioventricular bundle - AV bundle or bundle of His.
- This bundle is divided into right and left bundle branches which conduct the impulses toward the apex of the heart. The signals are then passed onto millions of Purkinje fibers and spread throughout the ventricles.
Electrical activities of the heart can be recorded in the form of an electrocardiogram, ECG or EKG. An ECG is a composite recording of all the action potentials produced by the nodes and the cells of the heart. Each wave or segment of the ECG corresponds to a certain event of the cardiac electrical cycle:
- When the SA node fires, electrical signals spread throughout the atria and cause them to depolarize. This is represented by the P wave on the ECG. Atrial contraction, or atrial systole, starts about 100 milliseconds after the P wave begins.
- The PR interval, which measures from the start of P wave to the start of QRS complex, represents the time between atrial depolarization and ventricular depolarization, and reflects the conduction through the AV node.
- The QRS complex represents ventricular depolarization:
- Q wave corresponds to depolarization of the interventricular septum.
- R wave is produced by depolarization of the main mass of the ventricles.
- S wave represents the last phase of ventricular depolarization toward the base of the heart.
- Atrial repolarization also occurs during this time but the signal is obscured by the large QRS complex.
- The ST segment reflects the plateau of action potentials in the ventricles. This is when the ventricles contract and pump blood.
- The T wave represents ventricular repolarization immediately before ventricular relaxation, or ventricular diastole. Because the rate of repolarization is slightly different for the 3 layers of the heart wall, the peak of T wave reflects repolarization of epicardial cells, while the end of T wave corresponds with repolarization of mid-myocardial cells.
The cycle repeats itself with every heartbeat.
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Komentáře

  • @RyanHealthAndVlogs
    @RyanHealthAndVlogs Před 8 minutami

    Permission to use this great video of yours for my presentation please? Thanks. I will give complete credits.

  • @pacifiquebusiness
    @pacifiquebusiness Před 46 minutami

    Thank You ❤

  • @pacifiquebusiness
    @pacifiquebusiness Před 58 minutami

    Thank You ❤

  • @mathcinema3549
    @mathcinema3549 Před 2 hodinami

    سبحان الله

  • @sprout8426
    @sprout8426 Před 7 hodinami

    why do sodium ions keep entering the axon during the action potential? if its facilitated diffusion, shouldn't the two sides reach an equilibrium? how comes there's a higher Na+ concentration inside the axon during the AP but more STILL enters? isn't that active transport against a concentration gradient? can't wrap my head around that bit

  • @arashkh661
    @arashkh661 Před 8 hodinami

    Very good

  • @MrSakiyaee
    @MrSakiyaee Před 9 hodinami

    I can not understand at all.

  • @samuelchinda-sb9zw
    @samuelchinda-sb9zw Před 10 hodinami

    I'm a cardiovascular pharmacologist, video is explicitly instructive and concise.

  • @kartickmahato-kr9yn
    @kartickmahato-kr9yn Před 15 hodinami

    Sir muje bhi hua hai kya karo

  • @budoor-km7jk
    @budoor-km7jk Před 16 hodinami

    Thank you so much

  • @johnsidrick
    @johnsidrick Před 19 hodinami

    oh well thank you

  • @hasanbbh
    @hasanbbh Před 21 hodinou

    2bac 👇

  • @albertdrevdal4233
    @albertdrevdal4233 Před 21 hodinou

    amazing video, but shouldn't the horizontal and amacrine cells be in opposite places in your illsutration at 5.10?

  • @zaccorpseman7366
    @zaccorpseman7366 Před 23 hodinami

    All these little chambers on our faces storing fluid are scary. Moments of extreme cold/fever just make you want to saw open your own face and drain some of this stuff out

  • @velichiioan-francisco4060

    Thank you, perfect refresh of infos

  • @user-oj1fg5kp6x
    @user-oj1fg5kp6x Před dnem

    M getting solution ❤❤❤❤reply

  • @user-oj1fg5kp6x
    @user-oj1fg5kp6x Před dnem

    I m from this but nothing is happening. What is the solution reply help me

  • @lemonmeringue3872
    @lemonmeringue3872 Před dnem

    My husband who turns 35 this year was just diagnosed with this.😞

  • @debyerickson7394
    @debyerickson7394 Před dnem

    For the last month i have had floaters and light flashes ,the floaters have seem to gone away but iam still haveing light flashes in the corner of my right eye ,i went to my optomologist and she said this would go away but iam still haveing the light flashes and its been a month i go back to see her tomorrow now what ?

  • @tharubaskaran
    @tharubaskaran Před dnem

    Give this channel a award just for this video!✨

  • @JoseCruzReyes-yp1bo

    ❤❤😮😮😊😊

  • @user-gp1zv5pn2o
    @user-gp1zv5pn2o Před dnem

    🙏✝️🤴👍👏👏👏👏👏👏👏👏👏

  • @jerseytony1
    @jerseytony1 Před dnem

    CAC Only measures Hard stable plaque and Statins increase and stabilize this Hard plaque.. SOFT plaque is the problem and the CIMT measures this Not the CAC CAC is used only to get business for the corrupt cardio drs One can have Zero CAC and get an attack from the Soft plaque..

  • @alliematelski1767
    @alliematelski1767 Před dnem

    So crazy yet we purposely breed dogs to have worse than this and think it's acceptable. WTF

  • @isaacdutson4021
    @isaacdutson4021 Před dnem

    What happens to the mRNA molecule after translation? Is it used to make more copies of the same protein or is it broken down into the nucleotide subunits?

  • @hettiegibbs8911
    @hettiegibbs8911 Před dnem

    What is treattment.

  • @vaishalisoni6293
    @vaishalisoni6293 Před dnem

    And yet women are expected to work through this🙄

  • @miranmuslem
    @miranmuslem Před dnem

    Thank you very much!

  • @BigPapichulo02
    @BigPapichulo02 Před dnem

    Hamburger

  • @user-xv4cp4eb6v
    @user-xv4cp4eb6v Před dnem

    I didn't understand anything

  • @user-so4bt8jt3z
    @user-so4bt8jt3z Před dnem

    رحمه الله والديج خوش تشرحين وعلي 👌

  • @hasan9630
    @hasan9630 Před dnem

    Is autism get well when kids grow?

  • @ayanrc3756
    @ayanrc3756 Před 2 dny

    Awesome ❤❤❤

  • @betheantibody
    @betheantibody Před 2 dny

    Finally 😮😮🎉🎉 thank you

  • @fullmoon5715
    @fullmoon5715 Před 2 dny

    Its all about food.... take autism as diabetes... eat keto diet and you will start feeling the results 💪

  • @helimarsantiago9869

    If you want to be healed go get acupuncture to calm your mind.Then learn how to start boiling your foods.Eat soups with low fod-map vegetables with chicken or fish.If you eat beef make sure it’s not fried and slow cooked make sure the meat is tender.Drink hot water after meals.Dont eat fruit by itself.No milk.Use a high quantity black seed oil if you accidentally over eat or eat something you know your not supposed too.Now go and thank God he allowed you to live!

  • @anmolkaur6873
    @anmolkaur6873 Před 2 dny

    Isnt the estrogen normally lower than the LH peak

  • @hudakamal9059
    @hudakamal9059 Před 2 dny

    Amazing thank u

  • @RafiouESSIEN
    @RafiouESSIEN Před 2 dny

    Thank you ❤❤🎉

  • @jessebb
    @jessebb Před 2 dny

    ebali my eti organy i glandy, kakogo hera voobshe eto v nashei systeme

  • @jessebb
    @jessebb Před 2 dny

    my vrode ne v medicinskom universitete, a v shkole fizru izhuchaem, chto eto za zalupa

  • @muhammadkhurramparacha-no3zp

    Amazing video really helpful while preparing for my exams

  • @UzairTheboss-ov6vn
    @UzairTheboss-ov6vn Před 2 dny

    My whole day=5 minutes😢 yyyy

  • @user-ci9ec3zt2h
    @user-ci9ec3zt2h Před 2 dny

    Good workkk

  • @deepashreenarayan3277

    Thank you ma'am ❤

  • @amayaparanagama8205

    Bro u literary saved 58 lecture slides and a 2h lecture 🤛🙏

  • @bradjon7231
    @bradjon7231 Před 3 dny

    I had a lung infection turn sepsis. I didnt go to emergency room untill 6 weeks later. I had been going to Med Now clinic. Then at home i had an attack. Felt like heart attack. Dropped me to my knees. A week later went to emergency room and was trandported 2hrs away to a big city hospital that had specialist to treat me perform surgey on my lungs. I knew i was in bad shap when the nurses started praying for me. Praise God!! It over a yr later now, i was on every antibiotic for 12 weeks, i still have diarria, weekness in my muscles, leg cramps, irritability.

  • @smilingfoxmedia1951

    Did anyone else watch this while drunk?

  • @beyazgul9413
    @beyazgul9413 Před 3 dny

    Dünyanın farklı ülkelerinden tıp öğrencileri buraya toplanıp aynı videoyu izleyip aynı şeyi öğrenmeye çalışıyoruz. Garip hissettiriyor. Garip ama güzel. Herkese başarılar

  • @PraveenSriram
    @PraveenSriram Před 3 dny

    My younger brother who is 32 years old and live at home 🏠 with me and my elderly parents has cerebral palsy which affects one side of his body.