Advanced – Dysrhythmias 2024/2025
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Excitability - 🧠ANSWER ✔✔the ability of non-pacemaker heart cells to
respond to an electrical impulse that begins in pacemaker cells.
Depolarization - 🧠ANSWER ✔✔occurs when the normally negatively
charged cells within the heart muscle develop a positive charge.
Conductivity - 🧠ANSWER ✔✔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.
Contractility - 🧠ANSWER ✔✔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.
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,AV Node - 🧠ANSWER ✔✔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.
SA Node - 🧠ANSWER ✔✔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.
Purkinje Cells - 🧠ANSWER ✔✔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.
Semi-Reclined - 🧠ANSWER ✔✔While obtaining a 12-lead ECG, remind the
patient be as as still as possible in a ________________________
position, breathing normally.
Clea, Dry, Moist - 🧠ANSWER ✔✔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.
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, P Wave - 🧠ANSWER ✔✔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.
PR Segment - 🧠ANSWER ✔✔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.
PR Interval - 🧠ANSWER ✔✔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).
QRS Complex - 🧠ANSWER ✔✔represents ventricular depolarization on
ECG lead.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
Exam Questions and Answers 100%
Guaranteed Success | Already Rated A+
Excitability - 🧠ANSWER ✔✔the ability of non-pacemaker heart cells to
respond to an electrical impulse that begins in pacemaker cells.
Depolarization - 🧠ANSWER ✔✔occurs when the normally negatively
charged cells within the heart muscle develop a positive charge.
Conductivity - 🧠ANSWER ✔✔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.
Contractility - 🧠ANSWER ✔✔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.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,AV Node - 🧠ANSWER ✔✔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.
SA Node - 🧠ANSWER ✔✔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.
Purkinje Cells - 🧠ANSWER ✔✔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.
Semi-Reclined - 🧠ANSWER ✔✔While obtaining a 12-lead ECG, remind the
patient be as as still as possible in a ________________________
position, breathing normally.
Clea, Dry, Moist - 🧠ANSWER ✔✔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.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, P Wave - 🧠ANSWER ✔✔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.
PR Segment - 🧠ANSWER ✔✔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.
PR Interval - 🧠ANSWER ✔✔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).
QRS Complex - 🧠ANSWER ✔✔represents ventricular depolarization on
ECG lead.
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
