7_Supraventricular Arrhythmias_Part B

Question 1

What is the difference with A-fib with and without WPW.

Answer 1

A-fib w/o WPW HR around 150 bpm

A-fib w/ WPW HR around 300 bpm (dangerous)

Question 2

What differentiates MAT and wandering atrial pacemaker?

Answer 2

MAT = HR > 100
WAP = HR < 100

Question 3

What is the atrial rate for A-fib?

Answer 3

350-600

Question 4

PAT, MAT, A-fib are examples of what classification of mechanism that result in SVT?

Answer 4

Automaticity

Question 5

This type of SVT has at least 3 different P’ wave morphologies with varying PR intervals. The rhythm is irregularly irregular.

Answer 5

Multifocal atrial tachycardia

Question 6

SVT with a wide QRS complex may signify what?

Answer 6

Aberration

Question 7

What is the difference between controlled and uncontrolled A-fib?

Answer 7

Controlled = < 100
Uncontrolled = >100

Question 8

Junctional rhythm have a HR of?

Answer 8

40-60 bpm

Question 9

What are the 3 hallmark signs of a premature junctional contraction?

Answer 9

• early beat
• compensatory pause
• inverted p-wave

Question 10

SVT is usually a regular or irregular rhythm?

Answer 10

Regular

Question 11

This type of SVT usually has a atrial rate of 250-350 with a ventricular rate equal to a multiple of 300.

Answer 11

Atrial flutter

Question 12

What are the 2 types of reentry tachycardias?

Answer 12

AV nodal reentry tachycardia

Atrioventricular reentry tachycardia

Question 13

What are the 2 hallmark signs of A-fib?

Answer 13

• Irregularly irregular rhythm

- No p waves evident

Question 14

Is a-flutter caused by automaticity or reentry mechanism?

Answer 14

reentry mechanism

Question 15

Atrial flutter usually result in F waves which are commonly called what?

Answer 15

Saw-tooth pattern

Question 16

What are the 2 hallmark signs of ectopic atrial tachycardia?

Answer 16

• Narrow tachycardia

- P-wave inverted in inferior leads

Question 17

This SVT results from an accessory pathway that causes premature activation of ventricular myocardial tissue which usually manifests on an ECG as a delta wave with a shortened PR interval.

Answer 17

WPW

Question 18

Can delta waves be seen in patients with WPW during a tachycardic episode?

Answer 18

No, delta waves are absent

Question 19

What beat is being described: inverted p-wave following sinus arrest/block.

Answer 19

Junctional escape beat

Question 20

What is the most common preexcitation syndrome?

Answer 20

WPW syndrome

Question 21

What is the difference between regular and irregular atrial flutter?

Answer 21

Regular is a consistent block or pattern

Irregular is variable blocks

Question 22

What are the 2 hallmark signs of accelerated junctional rhythm?

Answer 22

• HR 60-100

- No anterograde p-waves

Question 23

What are the 3 SVT classifications by mechanism?

Answer 23

• physiologic
• automaticity
• reentry

Question 24

This type of SVT originates in atrial site other than SA node, has an atrial rate of 100-250 bpm, and results in changes in P-wave morphology & PR interval.

Answer 24

Ectopic atrial tachycardia

Question 25

What is the difference between accelerated JR and junctional tachycardia?

Answer 25

accelerate JR = HR 60-100

junctional tachycardia = HR >100

Question 26

This type of tachycardia is commonly associated with COPD.

Answer 26

Multifocal atrial tachycardia

Question 27

Briefly explain what causes AVNRT.

Answer 27

• PAC finds fast pathway still in refractory
• PAC goes down slow pathway
• Before reaching the end of circuit fast pathway is not in refractory anymore
• Impulse can retrograde up the fast pathway and get caught in a loop

Question 28

Junctional rhythms can have what 3 p-wave patterns?

Answer 28

• Retrograde P wave before QRS
• P wave buried with QRS
• Retrogade P wave after QRS