Module 3 Heart Block

Question 1

Right bundle branch characteristics

Answer 1

Wide qrs
V1 and v2 (rsR) note R is taller than initial r wave, bunny
I, V5, V6 delayed slurred S wave

Question 2

Left bundle branch ekg characteristics

Answer 2

Wide qrs >.12 3 small boxes
V1, deep wide S wave
1, V5 and V6, broad monophasic R wave, no q waves

Question 3

Cardiac axis/QRS axis determines what

Answer 3

What direction depolarization occurs

Question 4

To determine the electrical activity of the ventricle we can use _____

Answer 4

Vectors

Question 5

What is the normal axis of the heart typically

Answer 5

60

0–> +90

Question 6

When assessing axis looking specifically at lead __and ____

Answer 6

I and avf

Question 7

In a tall, slender person the axis may be shifted to the ______

Answer 7

Right

Question 8

In an obese person qrs may be shifted to the _____

Answer 8

Left

Question 9

In cases of hypertrophied ventricle, the qrs vector deviates towards _____ side

Answer 9

Hypertrophied

Question 10

During mI, there is are area of dead tissue, the qrs axis will shift away towards the side of____ vectors

Answer 10

unopposed, away from MI

Question 11

To determine axis, look at leads ___ and _____ and determine if ____ is up or down

Answer 11

1& avf

QRS

Question 12

If qrs is upright in I and AVF

Answer 12

It is normal

Question 13

If qrs is up in lead I and qrs is down in AvF, is it left or right axis?

Answer 13

Left axis deviation

Question 14

If lead I is down and AvF is up, is it left and right axis deviation?

Answer 14

Right axis

Question 15

Is I and AVF are both down that signifies what ?

Answer 15

Extreme right axis deviation

Question 16

mobitz type 2 type II

ekg findings

Answer 16

PR remain constant,

no progressive lengthening

Question 17

type 3 heart block

Answer 17

unable to identify the consistency of p waves

Question 18

in sinus block, an unhealthy SA node, stops its pacing activity for at least one ____, there will be no __ waves

Answer 18

cycle
p

(transient, returns back to its regular rate and timing prior to the block)

Question 19

PR interval more than ___ sec indicates a first degree block

Answer 19

.2

Question 20

av blocks either slow or ______ conduction from the atria to the ventricles

Answer 20

eliminate

Question 21

this block lenthens the delay between atrial and ventricular depolarization

Answer 21

first degree

Question 22

first degree av heart block ___ interval is consistently prolonged

Answer 22

PR

Question 23

in wancheback type 2 the PR interval gradually ____, last P wave fails to conduct to ventricles resulting in a missing _____

Answer 23

lengthens

QRS

Question 24

mobitz type 2

Answer 24

blocks a number of atrial depolarizations before conduction ti ventricles becomes successful

can be 2:1 or 3:1

2 p waves before (qrs waves)

Question 25

both whenback and mobitz II have missing QRS complexes so how can u differentiate?

Answer 25

wenckeback, pr is lengthened but QRS is normal Mobitz II is likely if PR is normal but QRS is widened [;

Question 26

P waves without a qrs response can be which AV blocks

Answer 26

can be wanckeback and mobitz 2 or 3rd degree av block

Question 27

complete 3rd degree block prevents atrial depolarizations from reaching the _____

Answer 27

ventricles

Question 28

are limb leads or chest leads used to assess axis? and what plane is that

Answer 28

limb leads are used to assess axis. frontal plane