7_Supraventricular Arrhythmias_Part B Flashcards
What is the difference with A-fib with and without WPW.
A-fib w/o WPW HR around 150 bpm
A-fib w/ WPW HR around 300 bpm (dangerous)
What differentiates MAT and wandering atrial pacemaker?
MAT = HR > 100 WAP = HR < 100
What is the atrial rate for A-fib?
350-600
PAT, MAT, A-fib are examples of what classification of mechanism that result in SVT?
Automaticity
This type of SVT has at least 3 different Pā wave morphologies with varying PR intervals. The rhythm is irregularly irregular.
Multifocal atrial tachycardia
SVT with a wide QRS complex may signify what?
Aberration
What is the difference between controlled and uncontrolled A-fib?
Controlled = < 100 Uncontrolled = >100
Junctional rhythm have a HR of?
40-60 bpm
What are the 3 hallmark signs of a premature junctional contraction?
- early beat
- compensatory pause
- inverted p-wave
SVT is usually a regular or irregular rhythm?
Regular
This type of SVT usually has a atrial rate of 250-350 with a ventricular rate equal to a multiple of 300.
Atrial flutter
What are the 2 types of reentry tachycardias?
AV nodal reentry tachycardia
Atrioventricular reentry tachycardia
What are the 2 hallmark signs of A-fib?
- Irregularly irregular rhythm
- No p waves evident
Is a-flutter caused by automaticity or reentry mechanism?
reentry mechanism
Atrial flutter usually result in F waves which are commonly called what?
Saw-tooth pattern
What are the 2 hallmark signs of ectopic atrial tachycardia?
- Narrow tachycardia
- P-wave inverted in inferior leads
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.
WPW
Can delta waves be seen in patients with WPW during a tachycardic episode?
No, delta waves are absent
What beat is being described: inverted p-wave following sinus arrest/block.
Junctional escape beat
What is the most common preexcitation syndrome?
WPW syndrome
What is the difference between regular and irregular atrial flutter?
Regular is a consistent block or pattern
Irregular is variable blocks
What are the 2 hallmark signs of accelerated junctional rhythm?
- HR 60-100
- No anterograde p-waves
What are the 3 SVT classifications by mechanism?
- physiologic
- automaticity
- reentry
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.
Ectopic atrial tachycardia
What is the difference between accelerated JR and junctional tachycardia?
accelerate JR = HR 60-100
junctional tachycardia = HR >100
This type of tachycardia is commonly associated with COPD.
Multifocal atrial tachycardia
Briefly explain what causes AVNRT.
- 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
Junctional rhythms can have what 3 p-wave patterns?
- Retrograde P wave before QRS
- P wave buried with QRS
- Retrogade P wave after QRS
