ECG Basics
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| show | positive
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| show | negative
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| In lead III, the left leg electrode is... | show 🗑
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| show | Left foot electrode is +. Right and Left arm electrodes are ground.
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| What are the two ground electrodes in lead AVR? The positive electrode? | show 🗑
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| show | Positive = Left arm.
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| show | I, II, III, AVR, AVL, AVF
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| The limb leads lie in what plane? | show 🗑
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| Which leads are the "lateral" leads? | show 🗑
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| Which leads are the "inferior" leads? | show 🗑
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| show | Chest leads (V1-V6)
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| show | Positive electrode
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| show | By positive deflection
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| Amount of time represented b/n two heavy black lines | show 🗑
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| show | .04 second
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| show | 5
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| P wave: define and normal duration | show 🗑
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| QRS: define and normal duration | show 🗑
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| QT interval: define and normal duration | show 🗑
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| P-R interval: define and normal duration | show 🗑
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| Normal axis: | show 🗑
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| show | 60-100 bpm
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| show | 60-80 bpm
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| show | 40-60 bpm
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| Inherent rate of ventricular voci | show 🗑
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| Charictaristics of NSR | show 🗑
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| Rate and rhythm of Sinus Arrhythmia | show 🗑
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| show | P waves: uniform, + in lead II, one preceds each QRS, at very fast rates it may be diff to distinguish a P from T waves;
PR: 0.12 - 0.20 sec and constant;
QRS: 0.06 - 0.12 sec
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| show | Rate: <60 bpm;
Rhythm: Regular;
P: uniform, + in lead II, one preceding each QRS; PR: 0.12 - 0.20 sec and constant;
QRS: 0.06 < 0.12 sec
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| show | Rate: 101-180 bpm; Rhythm: reg;
P: uniform, + in lead II, one preceding each QRS;
@ very fast rates it may be diff to distinguish P from T waves;
PR: 0.12 - 0.20 and constant;
QRS: 0.06 - 0.12 sec
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| What is an axis of depolarization | show 🗑
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| show | Left axis deviation
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| What is the axis if lead I is negative and and aVF is positive | show 🗑
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| show | extreme right axis deviation
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| Dipole theory | show 🗑
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| General characteristics of supraventricular dysrhythmias | show 🗑
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| show | the impulse will conduct down the normal ventricular conducting system -> QRS will be of normal duration
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| show | Rate: usually 60 - 100 bpm, but may be slower; Rhythm: may be irregular as the pacemaker site changes from teh SA node to ectopic foci
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| show | Multifocal atrial tachycardia
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| show | P: size, shape and direction may change from beat to beat, at least 3 different P morphologies needed to Dx; PR: variable; QRS: 0.06 - 0.12 sec
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| What rhythm am I? Rate: 400-600, ventricular rate varies; Ventricular rhythm: irregularly irregular; P waves: none identifiable, fibrillatory waves present, erratic & wavy baseline; PR: not measurable; QRS: usually <0.12 | show 🗑
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| Rate and rhythm of SA Block | show 🗑
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| P, PR, and QRS characteristics in SA block | show 🗑
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| show | Rate: usually normal; Rhythm: irreg b/c or undetermined length of puase (doesn't march out); P: uniform, may be diff to distinguish P from T; PR: 0.12 - 0.20 and constant; QRS: 0.06 - 0.12
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| Origin of escape beat during sinus arrest | show 🗑
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| show | P prime wave present but is not from the sinus. PR interval will be wider than a junction escape.
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| show | Represents atrial depolarization by an automaticity focus, as opposed to normal sinus-paced P waves
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| show | Rate: usually w/in normal range but depends on underlying rhythm; Rhythm: regular and late beats; P waves: may occur before, during, or after QRS, inverted in leads II, III, aVF; PR: if P occurs before QRS, it will usually be < or= 0.12; QRS: usully<0.12
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| Rate and rhythm of Junctional Escape Rhythm | show 🗑
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| P, PR, and QRS characteristics in junctional escape rhythm | show 🗑
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| Charictaristics of Ventricular Escape | show 🗑
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