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hey everyone in this video were gonna look at first-degree AV blocks AV standing for atrial ventricular so lets get started the first-degree AV block the rate is going to be determined by the underlying rhythm it is a regular rhythm the P waves are present and normal the PR interval is elongated which is the tell-tale sign that youre probably dealing with an AV block the QRS width is normal as well and there are no drop beats of an AV block first-degree AV block so if we look up here we see that we have a P wave at about the first second Im sorry the the last little box before you have this dark line here and your QRS starts roughly five boxes later so an elongated PR interval is one that is 0.2 seconds or more or one big box or or longer on your ECG paper so chances are if you have a elongated PR interval and everything else looks pretty normal you might be dealing with the first-degree AV block you