Pacemaker Flashcards
Pacemaker indications/classes? (3)
Class I: Beneficial, Necessary
Class II: Favors usefulness
Class III: Not useful/harmful
Pacemaker considerations? (3)
1) Sxs w/ arrhy
2) Location of abn conduction/likelihood to progress
3) Risk of arrhy
Correlated sxs/arrhy important when?
Typical sxs?
sxs w/ bradyarrhy
syncope, dizzy, confusion, seizure
Conduction abnormality w/i AV node ECG findings?
Wide PR
Type 1 AV block (Mobitz wickebach)
Normal QRS
Conduction abnormality below AV node ECG findings?
Normal or slight widening PR
Type II AV block
Abn QRS (BBB/Fascicular Block)
Most common indication for pacemaker?
ECG findings?
SA node dysfxn
brady/tachy/pauses
SA node dysfxn Class I criteria?
Symptomatic HR < 40
Symptomatic chronotropic incompetence (U w/ exercise)
SA node dysfxn Class II criteria?
Brady w/o clear sxs correlation
Unexplained syncope
Acquired AV Block Class I criteria?
Severe conduction abn regardless of sxs:
Complete AV Block (3º) Advanced 2º Symptomatic 1º or 2º 2º w/ wide QRS or bifascicular block Exercise caused 2º or 3º
Acquired AV Block Class II criteria?
Asymp 2º block
Sympt 1º
Bi- trifascicular block w. syncope
Post-MI conduction abn Class I criteria?
3º block
Persistent 2º in HIS
Transient AV block w/ BBB
Fxns of pacemakers? (4)
1) stim depol
2) sense intrinsic card fxn
3) respond to ↑ demand
4) store info
Rate Response Pacing pacemakers indicated for?
chronotroph incompetence (can’t ↑ HR to meet ↑ demand)
chronic a fib
Vent Dysynchrony is caused by?
Electrical delay, U LBBB
Mechanical delay
Electromagnetic Interference is?
radio-freq 50-60 hz
e.g. electrocautery
