EKG Basics

AV Node can fire at a rate of?

• 60-100 times per minute

• 40-60 times per minute

• 40-20 times per minute

• 60-20 times per minute

The QRS complex is normally __________ seconds in duration

• 0.06 to 0.10

• 0.04 to 0.10

• 0.08 to 0.12

• 0.10 to 0.12

QRS complexes contract_______

• ventricle

• atria

• AV junction

• SA node

PR interval is ____-_____ seconds

• 0.06 to 0.10

• 0.10 to 0.12

• 0.12 to 0.20

• 0.20 to 0.25

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

• T wave

• U wave

• QT interval

• ST segment

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.

Artifact is

• a normal part of each EKG tracing

• an indication of decreased cardiac output

• sometimes caused by muscle tremors or extra patient movement

• consistently the same across the EKG tracing

The electrocardiograph can be used to do all the following EXCEPT

• detect cardiac dysrhythmias

• determine cardiac output

• identify the presence of myocardial ischemia and/or infarction

• evaluate the function of artificial impanted pacemakers