CVRN Basic EKG Rhythms Recognition
& Diagnostic Criteria Exam With 100%
Correct And Verified Answers
Depolarization - Correct Answer-- During rest
heart cells are polarized (negatively charged)
- Progressive wave of depolarization, during
which the cell changes from a negative to a
positive charge, passes through the heart
causing contraction of the myocardia (heart
cells)
Repolarization - Correct Answer-electrical
event that initiates relaxation of a cardiac
muscle cell: diastole
Electrical versus mechanical activity - Correct
Answer-- Electrical activity always precedes
mechanical activity
- Electrical activity can be present without
mechanical response
This is demonstrated in PEA: Pulseless
electrical activity
Upright complex - Correct Answer-Occurs
when the positive charges of depolarization
are moving towards the + electrode
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,Negative complex - Correct Answer-Occurs
when the positive charges move away from
the + electrode
Biphasic complex - Correct Answer-Occurs
when the wave of depolarization travels
perpendicular to an imaginary line drawn
between the - and + electrodes
Function of the ECG - Correct Answer--
Displays the electrical impulses stimulating
the heart
- Displays information on resting,
contraction, and recovery phases
- During rest, heart cells are negatively
charged
- During contraction, heart cells are positively
charged
- Electrical stimulation that causes the heart
to contract is called depolarization
- Progressive wave of depolarization passing
through the heart causes contraction of the
myocardial cells
Atrioventricular (AV) node - Correct Answer--
AV node is a deliberate traffic jam for the
electrical impulse
- Impulses transmitted to AV node are held
until the left and right atria have had a
chance to contract
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, - When mitral & tricuspid valves close, AV
node releases the impulse
- Impulse is transmitted rapidly down the HIS
bundle, then R & L bundle branches
- From the bundle branches the impulse
terminates in the Purkinje fibers to the
ventricular cells
ECG composition - Correct Answer--
Waveform
Movement away from the baseline in either a
positive or negative direction
- Segment
A line between waveforms; named by the
waveform that precedes or follows it
- Interval
A waveform and a segment
- Complex
Several waveforms
What does the P wave represent? - Correct Answer-- Atrial
depolarization and contraction
- Atrial repolarization occurs during QRS complex
What does the PR interval represent? - Correct Answer-- The
period of time from the onset of the P wave to
the beginning of the QRS complex is called the P-R
interval
- This interval represents the time between the onset
of atrial depolarization and the onset of ventricular
depolarization
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