Lecture 07/08: ECG: Enlargement Patterns and Conduction Disturbances Flashcards Preview

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Flashcards in Lecture 07/08: ECG: Enlargement Patterns and Conduction Disturbances Deck (18):
0

atrial HR counts which wave?

P wave

1

ventricular HR counts which wave?

R wave

2

Normal sinus arrhythmia during respiration is slow during _______ and fast during ________

inspiration; expiration

3

In wandering pacemaker, tall P waves are caused by________ and short P waves are caused by _______

tall --> higher sympathetic tone
short --> higher vagal tone

4

P mitrale

notched P wave. Indicative of LA enlargement

5

Why does LA enlargement result in P mitrale?

LA takes longer to depolarize because its enlarged. Vector to lead II not as strong because pulls electrical activity to the left instead of straight down towards lead

6

Which wave must always be present in alive animal?

T wave

7

Hyperkalemia

High K+

8

pericardial effusion

fluid in pericardial sac

9

pulmonary thromboembolism

clot in pulmonary aa.. Can cause lung thickening

10

Hypoproteinemia

low protein; fluid leaks outside blood vessels which can cause effusion

11

Causes of low voltage complex (things that dampen electrical signal):

normal variation, obesity, pleural effusion, pericardial effusion, hypothyroidism, pneumothorax, pulmonary thromboembolism, hypoproteinemia

12

bundle branch block

delay or block of conduction in a bundle branch

13

which bundle branch is more susceptible to injury?

RBB

14

Why does RBBB cause deep S?

RV must depolarize by cell to cell conduction with vector pointed away from lead II

15

Causes of 1st degree AV block

AV node disease, elevated vagal tone (most common), drugs, hyperkalemia, hypothermia

16

escape rhythm

Areas in ventricles that will fire unless they are superceeded by a normal beat that comes down and depolarized the ventricles first. Right beneath the bundle of His. Take over to "rescue" the ventricles if AV blocked

17

tx for 3rd AV Block

pacemaker

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