lecture 3 (chapter 6 and 8)

Question 1

the biphasic P wave is characteristic of atrial enlargement, but we want to know which of the 2 ____ is enlarged

Answer 1

atria

Question 2

a patient who has enlargement of the left atrium, because the mitral valve is stenosed, will have a biphasic P wave in lead _____

Answer 2

V1

Question 3

with left ventricular hypertrophy there is a very tall _____ wave in lead V5

Answer 3

R

Question 4

Characteristic T wave is commonly associated with ____ ventricular hypertrophy

Answer 4

left

Question 5

ventricular strain is characterized by depression of the ST____-

Answer 5

segment

Question 6

what is strain usually associated with

Answer 6

ventricular hypertrophy

Question 7

minor AV blocks lengthen the brief pause between _______ and _______

Answer 7

atrial depolarization and ventricular repolarization

Question 8

describe a third degree AV block

Answer 8

completely blocks the conduction of atrial stimuli to the ventricles

Question 9

the delay caused by a first degree AV block prolongs the _____

Answer 9

PR interval

Question 10

where does Wenckebach typically originate

Answer 10

AV node

Question 11

where does mobitz originate

Answer 11

below the AV node

Question 12

what inhibits the AV node, making it more refractory

Answer 12

vagal maneuvers

Question 13

if ventricular rate ranges between 40 and 60, the a focus in the ________ is probably pacing the ventricles

Answer 13

AV junction

Question 14

the diagnosis of a bundle branch block is mainly based on ______

Answer 14

widened QRS

Question 15

to diagnose BBB, the QRS complex must be at least _____ of a second in duration

Answer 15

0.12

Question 16

what type of disorder is sinus node dysfunction

Answer 16

bradyarrhythmias (disorders of impulse formation)

Question 17

what type of disorder is sick-sinus syndrome

Answer 17

disorder of impulse formation (bradyarrhythmias)

Question 18

what are the criteria for first degree AV block

Answer 18

1-to-1 ratio of P waves to QRS complexes, PR interval is fixed/consistent, PR interval exceeds 200 sec (must meet all 3)

Question 19

what are the 2 types of Type 1 second degree AV block present

Answer 19

grouped beats (groups are clusters of QRS complexes separated by missed single beats) or 2 P waves for every QRS complex, without groups or clusters of beats (all PR intervals will be the same)