EXAM #1: JUNCTIONAL AND VENTRICULAR DYSRHYTHMAIS Flashcards
In what patient populations are re-entrant junctional tachyarrhythmias most common?
Healthy young people
What may predipose one to a junctional tachyarrhythmia?
1) Anxiety
2) Excess caffeine
3) Fatigue
Where is re-entry most common to occur in junctional tachyarrhythmia?
AV junction
How do you differentiate between orthodromic and antidromic re-entry?
Orthodromic= narrow QRS Antidromic= wide QRS
What are the two modes of AV junction re-entry?
Slow and fast
What are the two common types of re-entrant junctional tachyarrhythmias?
1) AV junctional tachycardia
2) AV bypass tachycardia
What are the two subtypes of AV junctional tachycardia?
1) Slow-fast
2) Fast-slow
What are the two types of AV bypass tachycardia?
1) Orthodromic
2) Anidromic
What are the ECG characteristics of an orthodromic bypass tract conduction tachycardia?
Pre-excitation/ delta-wave that transitions to narrow QRS
What are the ECG characteristics of an antidromic bypass tract conduction tachycardia?
Pre-excitation/ delta-wave that does NOT transition to wide QRS
What are methods to manually convert SVT to sinus tachycardia?
1) Carotid massage
2) Mammalian diving reflex
3) Valsalva maneuver
What are the common p-wave morphologies in SVT?
1) NO p-wave (2/3)
2) P-wave following QRS (1/3)
3) RARE, p-wave preceding QRS
What is the definition of a re-entry ventricular tachyarrhythmia?
3 consecutive QRS complexes
What are the mechanisms of most ventricular tachyarrhythmias?
Re-entry
- Micro or macro
- Common with ischemia/ post-MI
What is V-Tac most commonly associated with?
IHD, but also
- Cardiomyopathy
- Valvular disease
- Drugs
