EKG - Atrioventricular Heart Block Flashcards
This also has ST segment changes for Ischemia, Infarction or Injury
If the _ is far from P, then what do we have?
Heart Block Poem
R is far from P
- first degree heart block
Longer, longer, longer, drop
then what do we have?
Wenkenback
If some ( ) dont get through,
then what do we have?
some Ps
- then we have Mobitz II
If ( ) and ( ) don’t agree,
then what do we have?
Ps and Qs
- then we have a third degree
How long is the PR interval of a 1st degree AV block?
0.30 seconds
What is the reason for a longer PR interval for 1st degree AV block?
delay in transmission from the atria to the ventricles
What is the characteristic of a second-degree AV block?
PR interval is constant but QRS is skipped
What is another name for a 2nd degree AV block?
Mobitz Type II or Wenckeback
What can a Mobitz Type II progress to?
Can rapidly progress to a complete heart block (3rd degree block)
What is the characteristic of a 1st degree AV block?
A longer PR interval
What is the characteristic of a 3rd degree AV block?
Complete heart block with no association between atrial and ventricular activity
What is the cause of 1st degree AV block?
myocarditis
electrolyte imbalance
medication
What is the cause of Mobitz type 2?
Cardiac injury
lyme disease
medications
valvular pathologies
What is the cause of 3rd degree block?
hypoxia
organ damage
What are the sx of 1st degree heart block?
may be asymptomatic
What are the sx of a 2nd-degree heart block?
dizziness
syncope
palpitations (chest pain)
SOB
Fatigue
possible exercise tolerance
What do we do for 1st degree heart block?
If asx = continue and monitor
What are the sx of 3rd-degree heart block?
Really tired
irregular rhythm
Dizziness
Syncope
Cardiac arrest
What do we do for a 2nd degree heart block?
reduce intensity and monitor
can get a pacemaker since it is unstable and can quickly get worse
We may not see them until the cause is fixed
What do we do for a 3rd degree heart block?
we often don’t treat unless a pacemaker is placed
What is the cause of an affected EKG for ischemia?
Decreased blood flow because of lower blood flow to the myocardium
- causes vasospasm, occlusion and thrombus
What is the anomaly of an ischemia?
T-wave inversion
What are the anomalies of a cardiac injury?
Acute injury = ST segment elevation
If ST-segment is elevated, what is the possible prognosis?
acute onset of chest pain (hours) = cardiac emergency and immediate treatment ASAP
What are the anomalies of a cardiac infarction?
can’t depolarize normally
can’t conduct an impulse
Q-wave changes are seen
