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Exam 9: Electrocardiography

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Question 21

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Which of the following heart arrhythmias is commonly found in young females who have a mitral valve prolapse?

A) Atrial flutter
B) Paroxysmal atrial tachycardia
C) Atrial fibrillation
D) Premature atrial complexes

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Question 22

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Which of the following BEST defines atrial tachycardia?

A) R-R intervals are irregular.
B) Heart rate is >200 bpm.
C) Three or more premature atrial complexes in a row.
D) P-R intervals are irregular with a duration of 0.25 second.

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Question 23

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When a therapist is assessing the cardiac cycle for rhythm and rate disturbances,which of the following assessment approaches is used to evaluate the P-R interval?

The presence of T wave inversion,ST segment changes,or Q waves in ECG chest leads V1,V2,V3,and V4 indicates an infarction in which of the following regions of the heart?

Which of the following sites is associated with a second-degree AV block,type II?

The rhythm strip reveals the following findings:absence of P waves before QRS complex,but a retrograde P wave may be identified,the QRS complex is normal and its duration is between 0.04 and 0.10 second,the R-R intervals are regular,and the ventricular rate is between 40 and 60 bpm.These findings BEST describe which of the following?

Which of the following components of the ECG impulse represents the atrial kick or the delayed conduction of the electrical impulse by the AV node one-tenth of a second?

A trained athlete with an increased resting and exercise stroke volume may exhibit which of the following heart arrhythmias?

Increased sympathetic activity through the release of norepinephrine and epinephrine from the adrenal gland results in which of the following changes in the heart?

Which of the following heart blocks is characterized by no communication between the atria and the ventricles,thus resulting in no coordination between the firing of the atria and the firing of the ventricles,creating a complete independence of the two systems?