EKG 2019 MIDTERM

What is also known as the pacemaker of the heart?

• AV Node
• SA Node
• Bundle of His
• Purkinje Fibers

The valve between the right atrium and right ventricle is known as the ___ valve.

• bicuspid/mitral
• tricuspid
• pulmonary
• aortic

Travel the electrical conduction of the heart starting with the SA node.

• AV node, Purkinje fibers, bundle of His, left and right bundle branches
• Bundle of His, left and right bundle branches, AV node
• AV node, Bundle of His, Purkinje fibers, left and right bundle branches
• AV node, Bundle of His, left and right bundle branches, Purkinje fibers

An atrial pacemaker site that changes from location to location has

• P waves that continually change in appearance

• One pacemaker site from which the impulse arise

• Inverted P’ waves

• A chaotic baseline preceding each QRS complex

Which of the following has more P waves than QRS complexes?

• A dysrhythmia where the pacemaker changes from site to site with each beat

• Early beats that arise from the atria

• AV heart block

• Dysrhythmias that arise from the AV junction

The ___________ represents the end of ventricular depolarization and beginning of ventricular repolarization.

• T wave

• U wave

• QT interval

• ST segment

ST segment elevation suggests:

• Myocardial ischemia

• Myocardial injury/infarction

• Right and left ventricular hypertrophy

• A healthy heart

The ___________ represents ventricular repolarization.

• T wave

• U wave

• QT interval

• ST segment

The point at which the QRS complex meets the ST segment is called the:

• QT junction.

• ST interval.

• J point.

• RS point.

Impulses that arise from the ventricles produce QRS complexes that:

• look the same as the QRS complexes which are produced by impulses originating from the SA node.

• are called R prime or R' waves.

• are typically notched and biphasic.

• appear wide and bizarre-looking.