Conduction Disorders (FAST) (Cardio 1) Flashcards
Sinus Bradycardia
impulses originate at SA node at slow rate
-all complexes normal, evenly spaced, <60 bpm
Sinus Tachycardia
impulses originate at SA node at rapid rate
-all complexes normal, evenly spaced, >100 bpm
Sinus Arrhythmia
impulses originate at SA node at varying rate
-all complexes normal, rhythm irregular
Atrial Flutter
impulses travel in circular course in atria
-rapid sawtooth flutter waves like the up and down of a rollercoaster; ventricular response is irregular
Atrial Fibrillation
impulses have chaotic, random pathways in atria
-baseline irregular, ventricular response irregular, no organized P waves
Supraventricular Tachycardia
- close to sinus tachycardia, but the upper rate limit of sinus tach is 160 and SVT rate is 160-200
- regular, rapid atrial rhythm
- P waves difficult to see but QRS complexes usually normal
Ventricular Tachycardia
impulses originate at ventricular pacemaker
-wide QRS complexes, rate > 120 bpm
Ventricular Fibrillation
chaotic ventricular depolarization
- rapid, wide irregular ventricular complexes
- irregular zigzag with no P or QRS
AV Block First Degree
long PR interval, but interval length does not change from beat to beat
Second Degree Block Type 1
progressively longer PR interval with a dropped beat (a missing QRS)
Second Degree Block Type 2
sudden dropped QRS
- PR interval will be normal or long, but will remain consistent size –> no pattern
- QRS may be narrow or wide
AV Block Third Degree
- impulses originate at AV node and proceed to ventricles
- zero communication between atria and ventricles
Premature Atrial Contraction
a single impulse originates in the atria (but not at the SA node) and causes a depolarization
-ectopic P wave
Premature Ventricular Contraction
a single impulse originates at the right ventricle
-wide QRS
Asystole
flat line –> no atrial or ventricular activity
