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Med-Surg: Telemetry Study Guide
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Med-Surg: Telemetry Study Guide
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Med-Surg: Telemetry Study Guideelectrical systole Correct Answer-activation
excitation
depolarization
electrical diastole Correct Answer-recovery
repolarization
mechanical systole Correct Answer-shortening
contraction
emptying
mechanical diastole Correct Answer-lengthening
relaxation
filling
automaticity Correct Answer-ability to initiate and maintain electrical
rhythm
excitability Correct Answer-ability to respond to electrical stimulus
conductivity Correct Answer-ability to transfer that electrical stimulus to
the neighboring cell
,contractility Correct Answer-the ability of myocardial cells to shorten
and contract in response to an electrical stimulus
force generated by the contracting myocardium under any given
condition
cardiac output Correct Answer-stroke volume X heart rate
amount of blood pumped by each ventricle in liters per minute
stroke volume Correct Answer-the amount of blood ejected with each
heart beat
affects by preload, afterload, and contractility
preload Correct Answer-volume of blood in ventricles at the end of
diastole
(ventricular filling)
afterload Correct Answer-the amount of resistance the ventricle must
overcome to eject the blood out of the heart
SA node Correct Answer-primary pacemaker of the heart
initiates electrical impulses at rate of 60-100 bpm
AV node Correct Answer-synchronizes atrial and ventricular activity
picks up slack of SA node at rate of 40-60 bpm
, bundle of HIS Correct Answer-located between atria and ventricles
should be the only pathway (if not, indicates conduction issues)
next stop is R and L Bundle Branches
Purkinje fiber Correct Answer-ventricles are finally stimulated to
contract
inherent rate of 30-40 bpm (if SA and AV node fail)
depolarization Correct Answer-stimulation
cardiac cell is normally negatively charged
cells receive an electrical stimulus
channels open for Na+ and Ca+ to enter cell
K+ leaves cell, but cell is positively charged
cardiac contraction
repolarization Correct Answer-relaxation
K+ continues to leave cell and Na+ flows into cell
however, Cl- now enters cell
restoration of negative charge
arrhythmias Correct Answer-"dysrhythmias"
disorders of the electrical impulse within the heart that causes
disturbances
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