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Easy EKG: Interpreting Rhythms - You talk about your "other video" that we should watch first, and say the link is in the description, but there are 5 links in the description. Which one are you talking about?
- excellent video
- So good!!  best video out there to review rhythms!
- Thank you! I'm in vet school and we just started covering heart physio. All the ECGs started to look the same after a while of class time so it was nice to slow it down and it helped me understand them a lot better. Too bad you can't help me with category B animals lol.
- Obrigada. Very good!
- thank you so much! this really helped me prepare for my ekg exam which i have today. u rock! wish u could teach our class :)
- Thank you, helps me to brush up my ecg skills
- Thanks allot for the vid. Nice and simple. Easy to break down
- Hello. Great video! Do you have a video that shows the dysrhythmias and includes pharmacological treatment including dosage and adverse effects?
- Guess im subscribing XD, Im learning to be a monitor tech
- This was very helpful! Thanks!
- What do you think of the AliveCor smartphone attachment that takes ECGs?
- Thank you! This was very helpful!
- I am an RN student. This was so helpful. Thank you.
- thank you SO much !!!
- A 3rd degree block is best described as a "complete" block.  There is no "connection" or coordination between atrial contractions and ventricular contractions.  I don't know if "random firing" of P and QRS is really the best way to categorize it.  They are not "random" at all.

The p waves (atrial contractions) are uniform and evenly spaced - just like they are supposed to be - at a rate of about 100/minute in your video.  However, the impulse never gets past the AV node.  The ventricles are "unaware" that the SA note fired and the atria contracted.  There is something wrong with the AV node or the bundle of HIS/perkinjes, causing them not to conduct the impulse to the ventricles.

The "auto-excitability" of he ventricles then allows for them to initiate a ventricular contraction on their own as a fail-safe.  The QRS's are wide (slow, indicating conduction thru muscle, not the conductive tissues), but they are uniform and evenly spaced at about 40/minute - indicating the contraction is initiating from roughly the same point in the ventricles.

Basically, you have 2 separate rhythms (atrial and ventricular) happening at the same time.  Occasionally, the P wave will be buried in the QRS.  You might be able to see it as a slight deformity in the otherwise uniform QRS (you can see it at 12:00, where there is a small hump in the - wave that is not there in a "normal" QRS), but not always.
- awesome. thanks so much. from a new tele nurse.
- I'm in nursing school so I understand how valuable time is. Thanks so much for taking the time to make this. Very helpful!
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- Thank you sir. Good brush up for an upcoming final.