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UCLA EKG test Flashcards _ presents 100- correct answered.pdf
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8/25/24, 4:15 AMUCLA EKG test
Jeremiah
Practice questions for this set
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Terms in this set (81)
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, 8/25/24, 4:15 AM
- inside of heart cell has a high potassium concentration, whereas the outside has a
electrically polarized at rest higher concentration of NA
-higher positive charge outside the cell cause more negative charge inside cell
electrical potential difference between the charges outside and inside of the cell wall
NA moves into the cell rapidly in response to an electrical impulse
Depolarization
- inside cell loses negative potential
ions return to their original resting state
Replolarization
- heart cells restore their resting polarity
Phase 0: Na flow in and rapid depolarization occurs when stimulated
Phase 1: Rapid return to isoelectric level
4 Phases of Electrophysiology of the heart
Phase 2: CA ions flow in and myocytes contract
cell
Phase 3: K flow out and rapid depolarization occurs
Phase 4: Polarized resting phase
- Sinoatrial node ( SA) node
Pacemaker cells -Atrioventricular node )AV node
- Purkinjie fibers
-primary pacemaker
- Rate: 60-100
SA node
- SA node depolarizes the atria via intro nodal tracts and Bachmann;s bundle = resulting
in atrial contraction
- responsible for slowing down conduction from the atria to ventricles just long enough
AV node for atrial contraction to occur
- rate: 40-60
- divides left and right branches
Bundle of His -impulses are conducted down LBB faster than RBB, allowing both ventricles to
contract at same time
- send impulses into mycardial tissues of the ventricles and causes them to contract
Purkunje fibers
- rate: 20-40
-contractile machinery of the heart
Myocardial cells
- myocardial cell is deplolarized, CA is released within cell causing cell to contract
NA: 135- 146 meq/L
K: 3.6-5.3 meq/L
Normal ranges for electrolytes Ca: 8.5- 10.3 mg/dl
Ionized Ca: 1.09 -1.29
Mg: 1.4- 1.9 mEq/L
v1: right sternal boarder and 4th intercostal space
v2: left sternal boarder and 4th intercostal space
v3: between v2 and v4
Placement of precordial leads
v4: midclavicular line and 5th intercostal space
v5: between v4 and v6
v6: between midaxillary line and 5th intercostal space
- small box: 0.04 secs
- 5 small box: 0.2 secs
EKG paper
- 5 Large box= 1 second
- 300 large boxes = 60 secs
0.12- 0.20 secs
PR interval
- beginning of the P wave to beginning of the QRS
- 0.04- 0.12 secs
QRS complex interval/ duration
UCLA EKG test - ventricular deplolarization
2/9
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