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16 Cards in this Set

  • Front
  • Back
Heart rate increases during inspiration
Decreases during exhalation

Completely normal
Pacemaker – SA Node
Rate Normal (varies)
Sinus Arrhythmia
Narrow QRS complex
HR above 100 coming from somewhere above the ventricles
Supraventricular Tachycardia
Different areas of the atria act as pacemakers
Usually seen in slow rhythms
P waves change beat by beat based upon the site of the pacemaker
QRS is usually normal
Wandering Atrial Pacemaker
Flutter waves replace the p waves
Rate is fast 300 bpm
Creates a sawtooth appearance
Ventricles can not respond to all atrial waves so you have a fixed conduction ration
Atrial Flutter
Rapid atrial rate
P waves are replaced by fibrillatory waves
Atrial rate can be as high as 350 bpm
Eventually the atrial depolarizations reach the ventricle

Rate is variable
QRS is normal
Rhythm is called irregularly irregular
Abnormality occurs at an irregular interval
Atrial Fibrillation
Ectopic site in atria fires early
Premature Atrial Contraction
Originates in the Av node
Shorter PR
No delay for AV conduction
P wave is inverted
Junctional Rhythm
PR is longer than 0.2 seconds
Longer than 5 small boxes
Conduction delay at AV node

P wave is normal
QRS is normal
Just delayed
May be a sign of future risk of conduction delays
1st Degree AV Block
Problem with the AV node itself
Progressive blocking of AV node conduction
Temporary following heart damage or surgery

PR gets progressively shorter with each beat until a p wave is not conducted
More severe type of 2nd degree block
Conduction ratio defect
P wave with no QRS at a fixed ratio
May degenerate into complete heart block
Occurs after large MI
No electrical contact between the atria and the ventricles
Atria fire at their intrinsic rate
So do the ventricles
P waves “march through”
3rd degree block
Irritable focus in the ventricle fires early
QRS is wide an bizarre
No p wave for that beat
Premature Ventricular Contractions
Blockage of the right bundle
First R wave represents LV
QRS is wide
Right Bundle Branch Block
Look at leads I, V5 and V6
Should see a wide QRS
Really a Rsr’

Blockage of the left bundle
First peak represent depolarization of the right ventricle
Left Bundle Branch Block
No concerted electrical activity
No hope for the future
Ventricular Fib
ST elevation
I, V2-V5
Anterolateral MI
Note the Q waves throughout
MI Acute