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42 Cards in this Set
- Front
- Back
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pacemaker cell length
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5-10 micrometers
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Backman's bundle
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allows rapid activation of left atrium from the right atrium
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myocardial cell length
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50-100 micrometers
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RCA gives blood to
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RV, AV node, part of septum, post and inf. walls of LV
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LCA
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LAD - anter and lateral LV (diagonal branches), anterior ventricular septum (septum perforators)
CFX Perfuses LA and posterior & lateral walls of LV (obtuse marginal branches) |
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end arteries
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RCA, LCA, LAD
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1 small box time
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0.04 seconds
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1 big block time
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0.2 seconds
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1 small square amplitude
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0.1 mV
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1 big square amplitude
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0.5 mV
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calc reg HR
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R to R interval in small boxes and divide into 1500
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calc irreg HR
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count QRS complexes in 30 big squares (6 seconds)
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first 1/2 of P wave
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RA
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2nd 1/2 of P wave
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LA
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where is isoelectric line
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T wave to P wave
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depolarization toward + electrode
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positive
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depolarization away from + electrode
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negative
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repolarization toward a + electrode
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negative
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repolarization away from a + electrode
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positive
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lead 1 degree
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0 degrees
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lead II degree
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+60
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Lead III degree
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+120
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AVL - left arm (+) degree
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-30 degrees
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AVR - right arm (+) degree
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-150
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AVF - legs (+) degree
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+90
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V1 placement
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4th intercostal space R of sternum
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V2
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4th intercostal L sternum
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V3
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between V2 and V4
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V4
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5th intercostal space in midclavicular line
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V5
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between V4 and V6
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V6
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5th intercostal space in midaxillary line
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anterior leads
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V1, V2, V3, V4
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Left lateral leads
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I, AVL, V5, V6
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Inferior leads
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II, III, AVF
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When a chamber enlarges 2 effects
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1. Chamber can take longer to depolarize – the wave increases in duration
2. Chamber can generate more current & larger voltage – the wave may increase in amplitude |
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Left axis deviation
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Lead I - positive
AVF - negative |
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Normal axis
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Lead I - positive
AVF - positive |
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extreme right axis deviation
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Lead I - negative
AVF - negative |
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right axis deviation
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Lead I - negative
AVF - positive |
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LV hypertrophy causes
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due to sustained, severe, untreated HTN has even greater electrical dominance over RV
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RV hypertrophy causes
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Severe COPD, any profound pressure or volume overload of RV
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RAE diagnosis
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P wave amplitudes >2.5 mm in II, III, and AVF (inferior leads)
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