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Sinus and Atrial Dysrhythmias (Introduction to Basic Cardiac Dysrhythmias) Chapter 3 Questions and Answers 2024
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Sinus and Atrial Dysrhythmias (Introduction to Basic Cardiac Dysrhythmias) Chapter 3
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Sinus and Atrial Dysrhythmias(Introduction to Basic Cardiac
Dysrhythmias) Chapter 3
Accessory Pathway - answerAdditional or abnormal electrical conduction pathway; the
bundle of Kent (Kent bundle) is an example.
Bundle of Kent - answerThe bundle of Kent is an abnormal extra or accessory
conduction pathway between the atria and ventricles that is present in a small
percentage (between 0.1 and 0.3%) of the general population
Antegrade - answerDownward movement of an electrical impulse from atria to
ventricles.
Atrial Dysrhythmias - answerRhythms that are initiated from a pacemaker site in the
atria, when the sinoatrial (SA) node fails to initiate an electrical impulse.
Bradycardia - answerHeart rate slower than 60 electrical impulses per minute.
Compensatory Pause - answerA pause in the rhythm that measure two times the R-to-R
interval of the underlying rhythm.
Delta Wave - answerExtra bump seen in the slurred section of the at the beginning of a
QRS complex; seen in wolff-parkinson-white syndrome
Wolff-Parkinson-White Syndrome - answerMost common type of ventricular pre-
excitation syndrome. Abnormal fast accessory conduction pathway from atria to
ventricle bypasses the rate-slowing AV node causing a delta wave and widening QRS
with shortened PR interval. Could lead to a reentrant circuit and supraventricular tachy.
Dsyrthmia - answerAbnormal cardiac rhythm; may be used interchangeably with the
term arrhythmia.
Inherent Heart Rate - answerNormal rate at which electrical impulses are generated; for
the sinoatrial node it is 60 to 100 beats/minutes.
Noncompetitors Pause - answerA pause in rhythm that measures less than two times
the R-to-R interval of underlying rhythm.
, Normal electrical conduction pathway - answerSinoatrial (SA) node to Atrioventricular
(AV) node, through the bundle of His and bundle branches, to the Purkinje's fibers,
ending in the ventricular muscle
Paoxysmal - answerSudden, intermittent start and stop of symptoms or dysrhythmias;
usually used to describe a type of atrial tachycardia.
Premature Complex - answerA complex that occurs earlier than expected in the
underlying rhythm.
Sinoatrial (SA) Node - answerPrimary pacemaker of the heart; it usually initiates the
electrical impulses that travel through the electrical conduction pathway of the heart.
Sinus Rhythms - answerCardiac rhythms that show the movement of an electrical
impulse traveling from the sinoatrial node to the ventricles, following the normal
electrical conduction pathway.
Tachycarida - answerHeart rate faster than 100 electrical impulses per minute.
The sinoatrial node normally generates 60 to 100 electrical impulses per minute. True or
False - answerTrue
Sinus bradycardia may become dangerous if the heart rate decreases significantly or
the patient becomes medically unstable. True or False - answerTrue
The complex that ends a sinus attest can only be initiated from the SA node. True or
False - answerFalse
A premature atrial complex is an atrial complex that occurs later than the next expected
complex s of the underlying rhythm. True or False - answerFalse
In a sinus arrhythmia, the heart rate increases with inspirations and decreases with
expirations. True or False - answerTrue
The number of electrical impulses in sinus tachycardia is between _________ and
_________ per minute. - answer101 ; 150
The atrial fibrillation, the QRS complexes usually measure ______ to ______ second. -
answer0.04; 0.12
Sinus exit block occurs when the SA node fails to initiate an electrical impulse for a
length of times equal to _______ previous cardiac cycles. - answerExactly two or more
If the onset of PAT/PSVT is not seen, the dysrhythmia is called: -
answerSupraventricular Tachycardia
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