Lecture Two <3 blocks

Question 1

___ sits right over the atria and is good for looking at __ waves

Answer 1

V1; P

Question 2

inverted P waves in the inferior leads often indicates ______ rhythm

Answer 2

junctional

Question 3

In Bundle branch blook (BBB), the QRS is longer than ___ msec, or ___ small boxes

Answer 3

120; 3

Question 4

If there are 2 R waves, and there is a positive terminal R wave in V6, what is the bundle branch block>?

Answer 4

Left bundle branch block

Question 5

BBB:

+ terminal R-wave in V1, (-) terminal R wave in V6 indicates _____

Answer 5

RBBB

Question 6

BBB:

(-) terminal R-wave in V1, + terminal R-wave in V6 indicates

Answer 6

LBBB

Question 7

There are a total of __ fasiculi in the heart. What are they?

Answer 7

3; R. bundle branch, Left anterior fasciulus, left posterior fasiculus

Question 8

“bunny ears” in V6 indicates? what about V1?

Answer 8

LBBB, RBBB

Question 9

1st degree AV block is characterized by a PR interval greater than ___ msec or ___ big box(es)

Answer 9

200, 1

Question 10

Any dropped QRS’s in 1st degree AV block? Anything to worry about pathologically?

Answer 10

no; not particularly

Question 11

Which form of second degree AV block is considered pathological and needs a pacemaker?

Answer 11

2nd degree type II (non-wenckebach)

Question 12

PR intervals increase until one is dropped in what AV block?

Answer 12

second degree type 1 (wenckebach)

Question 13

“grouped” beating is seen in what type of AV block>?

Answer 13

2nd degree type 1 (wenkebach);

ie 3:2

Question 14

P’s and Q’s are “divorced” and don’t correlate in what AV block? Is this important?

Answer 14

3rd degree; yes can be fatal

Question 15

PR intervals are normal and then a QRS is dropped randomly. What AV block is this?

Answer 15

Mobitz type II

Question 16

In 3rd degree AV block, p waves are ___. Ventricular depolarization is ____.

Answer 16

normal;
slow

each at their own rhythm
P-wave comes from SA node;
QRS comes from ventricles or junctional focus

Question 17

QRSs are typically wider in what 2nd degree AV block?

Answer 17

non wenckebach (type 2)

Question 18

A wide QRS in 3rd degree AV block indicates a ____ focus.

Answer 18

ventricular

bpm is 20-40