Bradyarrhythmias

Question 1

Sinus Arrest

Answer 1

SA Node doesn’t fire off

Pause greater than 2 sec.

Question 2

Junctional Rhythm

Answer 2

No atrial activity; NO P-Waves
AV Junction is pacemaker (40-60 bpm)
Slower, wider QRS complex/could also be narrow

Question 3

Tachy-Brady Syndrome

Answer 3

episodes of slow and fast from SA Node; Sinus Node dysfunction

Question 4

First Degree AV Block

Answer 4

Slowing conduction within AV Node
PR Interval is over .2 sec/200 msec
Asymptomatic, no treatment necessary

Question 5

Second Degree AV Block- Mobitz I (Wenkebach Block)

Answer 5

Prolongation of PR Interval until there is failure to conduct a ventricular beat; block is located in the AV Node

Question 6

Second Degree AV Block- Mobitz II

Answer 6

Fixed PR Interval
Dropped QRS complex (nonconducted beats) can be 2:1 ratio P Wave: QRS complex
High Grade AV Block-can progress to complete heart block
Block is located in the Bundle of HIS, malignant form of heart block
Emergency due to risk of progression-Pacemaker

Question 7

Complete Heart Block

Answer 7

No conduction from the Atria to the Ventricles
P-Waves separate and independent of Ventricles (QRS complex)
Atrial Rate > Ventricular Rate
Pt present with synocope-medical emergency-pacemaker
Wide QRS complex

Question 8

Bradyarrhythmias

Answer 8

Caused by 2 Problems:

1. Impulse Formation: not getting started (Sinus Node)
2. Impulse Conduction: not getting through (AV Node)