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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| In the AVF lead, where is the + charge located? The ground? | show 🗑
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| What are the two ground electrodes in lead AVR? The positive electrode? | show 🗑
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| What are the ground electrodes in lead AVL? And the positive? | show 🗑
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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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| show | I and AVL
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| show | II, III, and AVF
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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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| show | 0.2 second
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| Amount of time represented b/n two fine lines | show 🗑
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| show | 5
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| show | Atrial depolarization; no more than 2.5 mm in height & no more than .11 sec in length
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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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| show | -30 to -90
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| show | 60-100 bpm
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| show | 60-80 bpm
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| Inherent rate of Junctional foci | show 🗑
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| show | 20-40 bpm
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| show | Rate: 60-100 bpm;
Rhythm: Regular;
P waves: uniform, + in lead II, one precedes each QRS;
PR interval: 0.12-0.20 sec and constant from beat to beat;
QRS duration: 0.06 - 0.12 sec
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| show | Rate: Usually 60 - 100 bpm;
Rhythm: irregular, phasic w/respiration, increase w/inspiration (sympathetic), decr w/expiration (parasymp)
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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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| Charictaristics of Sinus Bradycardia | show 🗑
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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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| show | the mean vector located by degrees in the frontal plane.
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| What is the axis if lead I is positive and aVF is negative | show 🗑
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| show | Right axis deviation
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| show | extreme right axis deviation
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| show | A wave of depolarization towards + electrode inscribes a + deflection; A wave of depolarization toward a - electrode inscribes a - deflection.
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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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| Rate and rhythm of a Wandering Atrial Pacemaker | show 🗑
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| What do you call a wandering atrail pacemaker with a rate > than 100 bpm? | show 🗑
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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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| show | Atrial fibrillation
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| Rate and rhythm of SA Block | show 🗑
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| show | P: uniform, + in lead II, one precedes each QRS, at very fast rates it may be diff to distinguish P from T; PR: 0.12 - 0.20 and constant from beat to beat; GRS: 0.06 - 0.12 sec
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| Charictaristics of Sinus Arrest | show 🗑
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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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| P prime wave | show 🗑
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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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| show | Rate: 40-60 bpm; Rhythm: regular
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| show | P: may occur before, during, after QRS, inverted in II, III, & aVF; PR: if a P occurs before QRS it's usually < or = 0.12, if there's no P there's no PR; QRS: usually < 0.12 sec
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| show | Rate: usually too slow to adequately perfuse (15-40 bpm); No P wave or atrial foci; no junctional escape mechanism; will likely see ischemic changes
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