, Updated Advanced Dysrhythmias Exam
Review Questions and Answers 100%
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the ability of non-pacemaker heart cells to respond to an electrical
impulse that begins in pacemaker cells. - Answer>> Excitability
occurs when the normally negatively charged cells within the
heart muscle develop a positive charge. - Answer>>
Depolarization
the ability to send an electrical stimulus from cell membrane to
cell membrane. As a result, excitable cells depolarize in rapid
succession from cell to cell until all cells have depolarized. Ex: the
wave of depolarization causes the deflections in the ECG
waveforms that are recognized as the P wave and QRS complex.
- Answer>> Conductivity
the ability of atrial and ventricular muscle cells to shorten their
fiber length in response to electrical stimulation, causing sufficient
pressure to push blood forward through the heart. In other words,
this is the mechanical activity of the heart. - Answer>>
Contractility
where impulses slow down or are delayed before proceeding to
the ventricles. This delay is reflected in the PR segment on the
ECG. This slow conduction provides a short delay, allowing the
atria to contract and the ventricles to fill. - Answer>> AV Node
the heart's primary pacemaker. It can spontaneously and
rhythmically generate electrical impulses at a rate of 60-100 beats
per min and therefore has the greatest degree of automaticity. -
Answer>> SA Node
, composed of the bundle of HIS, bundle branches, and these
fibers. Responsible for the rapid conduction of electrical impulses
throughout the ventricles, leading to ventricular depolarization and
the subsequent ventricular muscle contraction. - Answer>>
Purkinje Cells
While obtaining a 12-lead ECG, remind the patient be as as still
as possible in a ________________________ position, breathing
normally. - Answer>> Semi-Reclined
For continous ECG monitoring, be sure to __________________
skin and clip hairs/shave. Ensure that the electrode placement is
_____________ and the gel on each electrode is
______________ and fresh. - Answer>> Clea, Dry, Moist
a deflection on an ECG representing atrial depolarization. When
the electrical impulse is consistently generated form the SA node,
this wave has a consistent shape in a given lead. If an impulse is
then generated from a different (ectopic) focus, such as atrial
tissue, the shape of this wave changes in the lead, indicating that
an ectopic focus has fired. - Answer>> P Wave
the isoelectric line from the end of the P wave to the beginning of
the QRS complex, when the electrical impulse is traveling through
the AV node, where it is delayed. - Answer>> PR Segment
measured form the beginning of the P wave to the end of the PR
segment. Represents the time required for atrial depolarization,
the impulse delay in the AV node, and the travel time to the
Purkinje files. Normally measures from 0.12-0.20 seconds (five
small blocks). - Answer>> PR Interval
represents ventricular depolarization on ECG lead. - Answer>>
QRS Complex
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