Cardiac Conduction System and Understanding ECG, Animation.

Cardiac Conduction System and Understanding ECG, Animation.


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 electrical gateway to the ventricles. It delays the passage
of electrical impulses to the ventricles. This delay is 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 then divided into right and
left bundle branches which conduct the impulses toward the apex of the heart. The signals
are then passed onto Purkinje fibers, turning upward and spreading throughout the ventricular
myocardium. Electrical activities of the heart can be
recorded in the form of electrocardiogram, ECG or EKG. An ECG is a composite recording
of all the action potentials produced by the nodes and the cells of the myocardium. Each
wave or segment of the ECG corresponds to a certain event of the cardiac electrical
cycle. When the atria are full of blood, 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 ms after the P wave begins. The P-Q segment represents the time the signals
travel from the SA node to the AV node. The QRS complex marks the firing of the AV
node and 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 at the base of the heart. – Atrial repolarization also occurs during
this time but the signal is obscured by the large QRS complex.
The S-T segment reflects the plateau in the myocardial action potential. This is when
the ventricles contract and pump blood. The T wave represents ventricular repolarization
immediately before ventricular relaxation, or ventricular diastole.
The cycle repeats itself with every heartbeat.

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100 Replies to “Cardiac Conduction System and Understanding ECG, Animation.”

  1. If this video is helpful to you, please consider supporting our next projects. As a token of our appreciation, we also offer early video access and free image downloads in return, please check us out here: https://www.patreon.com/AlilaMedicalMedia

  2. This is the most informative, easy to follow, yet concise video I've found on this subject. Thanks for posting!

  3. thank you for thıs vıdeo,very useful and explanatıons very well ,understandable,many thanks agaın ,please go on ,,

  4. Sometimes I wonder why am i paying so much for my school fees when i dont get high quality lecture like this one over here hahaha

  5. Thank you so much for this amazing video. It’s really get to the point. I have added your web as apart of my research sites for my nursing degree file. Again, thank you so much for what you have to offer.

  6. I hv one doubt… Atria relax(repolarize) when ventricles contract(depolarize)( i.e.during QRS- complex) but its signal is not heard. But then why we call T-wave as joint diastole when only ventricles relax (repolarize) at that time..?
    Hope you got my question Sir.

  7. The professors nowadays are terrible. There’s a few hidden Gems out there, but for the most part the rest have no passion for teaching…

  8. This is the absolute best description of what is going on in the heart during the EKG on the INTERNET! THANK YOU!

  9. INTERESTING FACT: If you Listen to Music at a Loud Volume, your Heart Syncronises to the Rythem of the Song. 🎧🤓🤗

  10. OMG this video help me big time in understanding the cardiac conduction! I will definitely support your channel by buying one of your merchandise.

  11. My doubt is why does P wave return to Baseline, because the ventricles are still polarised and vector should point downwards.??

  12. The video, animation, and the explanation are just great. Great work sir. I just have few doubts. Can i ask them here ?

  13. Seriously…I never realised that myself who is very bad in study would understand this concept so easily…Thank you sir thank you very much

  14. My professor with 2 PhD degrees took 1.5 hours to explain this shit and still made no sense. This guy did perfectly in 3 mins. wth

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