NURS 358 EKG EXAM 1
NURS 358 EKG EXAM 1 WITH GUARANTEED ACCURATE ANSWERS |2024\2025
Electrophysiology - ACCURATE ANSWERS✔✔ 1. Automaticity
- ability to create electrical impulse spontaneously
- every cell contains
2. Excitability
- ability to respond to outside stimulus
- ready to transmit/contract
3. Conductivity
- receive impulse, conduct to nearby cells
4. Contractility
- ability to shorten, or contract
Polarization - ACCURATE ANSWERS✔✔ alive and ready for signal
,- inta/extra cellular ions aligned
Depolarization - ACCURATE ANSWERS✔✔ ions shift, creating wave
as it shift down
- electrical signal flows down myocardial fiber
- becomes permeable and ions shift
Repolarization - ACCURATE ANSWERS✔✔ resetting of the ions to
resting state
Refractoriness - ACCURATE ANSWERS✔✔ absolute
- cannot be depolarized
- ions not set up/stable
Relative
- some of the ions have shifted/reset
- can be depolarized, but not as efficient, could lead to dangerous
rhythms
Conduction system - ACCURATE ANSWERS✔✔ 1) SA Node- sets
pace for heart
2) AV Node- backup
3)bundle of hiss
4) right and left bundle branches
,5) Purkinje Fibers- results in wring contraction at apex and moves
toward atrium
Normal cardiac cycle - ACCURATE ANSWERS✔✔ PQRST
Isoelectric line deflections - ACCURATE ANSWERS✔✔ 1st positive
-P
1st negative
-Q
2nd positive
-R
2nd negative
-S
Isoelectric
- ST segment
3rd positive
-T
P wave - ACCURATE ANSWERS✔✔ represents atrial depolarization
- positive, SA node
- first section
QRS complex - ACCURATE ANSWERS✔✔ ventricular depolarization
, -spike
T wave - ACCURATE ANSWERS✔✔ ventricular repolarization
- resetting to resting state
- normally positive deflection, rounded wave
Atria repolarize - ACCURATE ANSWERS✔✔ behind QRS complex,
cannot see it
Positive blip - ACCURATE ANSWERS✔✔ U wave, electrolyte
disturbances, or bradycardia waves
Strip interpretation steps - ACCURATE ANSWERS✔✔ 1. What is the
rate? # of QRS complexes
2. Is the rhythm regular
3. Are there P waves
4. Are the P waves matches with a QRS
5. Do the QRS look normal
6. Evaluate intervals and overall appearance
7. Interpret rhythm and clinical significance
Rate - ACCURATE ANSWERS✔✔ 1. 6 second method
2. Look at both atrial and ventricular
- 60-90/100
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