Cardiology EKG disease info

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First found May 22, 2018

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EKG Terminology, mechanisms, etc. (only the weird ones)
Bundle Branch Block (BBB)
Right Bundle Branch Block (RBBB)
Electric impulse is blocked through Right Bundle Branch
So, it travels down unblocked left branch and depols left ventricle first
Then crosses IV septum and depols Right Ventricle
 widened QRS
Left Bundle Branch Block (LBBB)
Same as right, but opposite (i.e. Left instead of Right)
Atrial Fibrillation
Tx: with Heparin/warfarin
To Slow heart rate: Adenosine does NOT work, use Verapamil
NEVER shock (unless they have been on blood thinners for couple months)
Check for Thrombi
Ventricular Tachycardia
↓ CO
Ventricular Fibrillation
Lethal because effective circulation stops
Most common cause of death in coronary artery disease patients
Ventricles cannot contract because of the rapidity of the impulse
Heart Block
1st Degree Heart Block
Delaying of conduction at the AV node
Impulse spreads normally from SA node, aside from delay
Every impulse makes it to ventricle
Not TRUE block (just conduction abnormality)
2nd Degree Heart Block
Mobitz Type I, Wenckebach
Most Common, Least Serious
Never progresses to 3rd Degree block
Block is within AV node
Each impulse produces a longer delay in AV node until 3 rd or 4th impulse can’t make it to
ventricle (PR Prolonged).
PR Interval gets longer until P wave occurs without QRS (dropped beat)
This pattern repeats (5:4-, 4:3-, 3:2-Wenckebach)
Mobitz Type II
Block below AV node (Bundle of His, Bundle Branch area)
Can progress to 3rd degree block or Asystole
PR Interval are consistent length prior to dropped beat
Ratio varies
3rd Degree Heart Block (Complete Heart Block)
No atrial impulses get through to the Ventricles
Atria and ventricles continue at their intrinsic rate
They are driven by independent pacemakers
If pacemaker is: AV Junction:
Ventricular rate follows normal pathway (40-60 bpm)
No normal conduction (20-40 bpm)

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