L4: Atrial and Ventricular Dysrhythmias

Question 1

All sinus dysrhythmias (as a group) have

Answer 1

normal morphology, including p waves

Question 2

All atrial dysrhythmias have

Answer 2

weird looking p waves

varying PR intervals

Question 3

Wandering atrial pacemaker criteria

Answer 3

3+ P’ waves with altered appearance

Regular rate

Question 4

PACs are followed by

Answer 4

non-compensatory pause

Question 5

P waves in PACs

Answer 5

occur before QRS

different morphology, +/- inverted

Question 6

Multifocal atrial tachycardia is basically

Answer 6

wandering atrial pacemaker + faster

changing P’ wave morphology

Question 7

It’s a SVT if

Answer 7

the p waves can’t be measured, but it’s def supraventricular because QRS is normal

Question 8

Atrial flutter is caused by

Answer 8

re-entry circuit

Question 9

Describe afib

Answer 9

Irregularly irregular
P waves absent→ chaotic looking baseline→ f waves
No P’R interval

Question 10

All junctional dysrhythmias have

Answer 10

inverted P waves, since depolarization goes backwards from junction to atria

Question 11

A PJC is

Answer 11

Premature Junctional Complex

Single early electrical impulse that arises from the AV junction

Question 12

A PJC is followed by

Answer 12

Non-compensatory pause

Question 13

Junctional tachycardia arises from

Answer 13

bundle of his

Question 14

Describe ventricular dysrhythmia

Answer 14

Wide, bizarre QRS (>.12 sec)
T waves in opposite direction of R wave
No p waves

Question 15

Idioventricular rhythm aka

Answer 15

“Rhythm of last resort”

Slow dysrhythmia, arises from ventricles (no other impulse

Question 16

V tach definition

Answer 16

3 or more PVCs in a row

Question 17

Can cause V tach

Answer 17

R-on-T PVCs→ occur on/ near previous T wave

Question 18

Torsade de pointes is

Answer 18

a variant of Polymorphic Ventricular Tachycardia

Question 19

2nd degree heart block type I aka

Answer 19

Wenckebach, Mobitz I

Question 20

2nd degree heart block type I

Answer 20

Patterned irregularity

PR interval progressively increases until a QRS complex is dropped → next PR shorter→ cycle repeats

Question 21

2nd degree heart block type II

Answer 21

“Mobitz II”
Prolonged but constant PR interval
Intermittently a QRS complex is dropped

Question 22

2nd degree heart block type II arises from

Answer 22

bundle of His or bundle branches

Question 23

2nd degree heart block type I arises block at

Answer 23

AV node

Question 24

2nd degree heart block type II arises block at

Answer 24

bundle of His or bundle branches