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NURS 305- Dysrhythmias: Questions & Verified Answers
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NURS 305- Dysrhythmias: Questions & Verified Answers
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NURS 305- Dysrhythmias: Questions & VerifiedAnswers
Cardiac Monitoring vs ECG Correct Ans - Continuous Cardiac
monitoring- tracking 3-5 leads over long period of time
ECG- 12-15 leads all looking at different angles of the heart for a short time
What is cardiac monitoring used for? Correct Ans - §To monitor a
patient's heart rate.
§To evaluate the effects of disease or injury on heart function.
§To evaluate pacemaker function.
§To evaluate the response to medications
§To obtain a baseline recording before, during, and after a medical
procedure.
§To evaluate for signs of myocardial ischemia, injury, and infarction.
Flow of electricity through the heart Correct Ans - SA node-->
depolarize atria--> atrial contraction-->AV node-->Bundle of his-->Bundle
branches-->Purkinje fibres-->depolarize ventricles-->ventrical
contraction--> facilitates blood pumped out
5-lead cardiac monitoring placement Correct Ans - White on the
right
Clouds over grass
Black on the left
Smoke over fire
Chocolate close to the heart
Depolarization Correct Ans - Movement of ions across a cell
membrane, causing the inside of the cell to become more positive; an
electrical event expected to result in contraction
Repolarization Correct Ans - Movement of ions across a cell
membrane (back to where they need to be) in which the inside of the cell is
restored to its negative charge
Ectopic Beat Correct Ans - Impulse(s) originating from a source
other than the SA node, messing up sequence, produces an abnormal beat
, Permeability Correct Ans - Ability of a membrane channel to allow
passage of electrolytes once it is open
Absolute Refractory Period Correct Ans - Corresponds with the
onset of the QRS complex to approximately the peak of the T wave; cardiac
cells cannot be stimulated to conduct an electrical impulse, no matter how
strong the stimulus
Relative Refractory Period Correct Ans - Corresponds with the
downslope of the T wave; cardiac cells can be stimulated to depolarize if
the stimulus is strong enough
Automaticity Correct Ans - The unique ability of the heart to
contract and generate electricity by itself, independent of any signals or
stimulation from the body
3 main areas of electrical conduction in the heart Correct Ans - 1.
SA node
2. AV node
3. Bundle of His, Bundle branches, and Purkinje fibers
Intrisnic Pacemaker Rates of Cardiac Conduction Tissue Correct Ans -
SA Node: 60-100bpm
AV Node: 40-60bpm
Purkinje fibers: 15-40bpm
Afterload Correct Ans - The pressure or resistance which the
ventricles must pump against to eject blood
Preload Correct Ans - Force exerted by the blood on the walls of the
ventricles at the end of diastole (how much blood is in the ventricles at the
end of diastole?)
Contraction Correct Ans - Ability of cardiac cells to shorten, causing
cardiac muscle contraction in response to an electrical stimulus
Venous Return Correct Ans - Amount of blood flowing into the right
atrium each minute from the systemic circulation
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