# First Degree Heart Block

by Carlo Raj, MD

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00:01 Okay. First degree AV block, what does that mean? Defined by an ECG, here you go, prolonged PR interval. Stop there. What is the time? Okay, 0.12 to 0.2 seconds, excellent. Now that seconds, don't get this confused with millisecond, same darn thing.

00:18 The unit is a little bit different, that is all. So 200 milliseconds is equivalent to how many seconds? 0.2. You want to know just enough math in your residency, in your internship or whatever so that you can make common sense type of answers right. Now if you love math and such, then of course, you can go into whatever that you want. Radiology has a bunch of physics in it or even certain amount of cardiology will have tons of maths in it, so there is a place for if you love math. But if you don't love math at least be able to come up with common sense type of answers. So 200 milliseconds is equivalent to 0.2 seconds.

00:59 If it is greater than it, what is it? The PR interval we have first-degree AV block or first-degree heart block. Now how many of your PR intervals on a strip of EKG will have a prolonged PR interval? Every single PR interval okay. Now is this dangerous? Is the patient going to have serious sequelae? No. Typically asymptomatic. So we are good there.

01:26 So it is first-degree, know the definition. You don't see anything else. Prolonged PR interval

The lecture First Degree Heart Block by Carlo Raj, MD is from the course Arrhythmias: Basic Principles with Carlo Raj.

### Included Quiz Questions

1. The PR interval is greater than 200 milliseconds.
2. Patients with first-degree heart block typically have symptoms.
3. The ECG shows a shortened PR interval.
4. The QRS complex is widened.
5. PR interval is greater than 2 seconds.

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