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