Cardiology Quiz 2 Flashcards
According to the Einthoven triangle, lead II is assessed by placing the:
A) negative lead on the left arm and the positive lead on the left leg.
B) negative lead on the right arm and the positive lead on the left leg.
C) positive lead on the left arm and the negative lead on the right arm.
D) positive lead on the left leg and the negative lead on the right arm.
B) negative lead on the right arm and the positive lead on the left leg.
An electrical wave moving in the direction of a positive electrode will:
A) manifest with narrow QRS complexes.
B) cause a negative deflection on the ECG.
C) produce a significant amount of artifact.
D) cause a positive deflection on the ECG.
D) cause a positive deflection on the ECG.
A prolonged PR interval:
A) is a sign of rapid atrial depolarization.
B) indicates that the AV node was bypassed.
C) indicates an abnormal delay at the AV node.
D) is greater than 120 milliseconds.
C) indicates an abnormal delay at the AV node.
A wide QRS complex that is preceded by a normal P wave indicates:
A) rapid conduction through the ventricles.
B) an abnormality in ventricular conduction.
C) that the rhythm is ventricular in origin.
D) a delay in conduction at the AV junction.
B) an abnormality in ventricular conduction.
If a particular interval on the ECG graph paper is 1.5 small boxes in width, the interval
would be measured as:
A) 600 milliseconds.
B) 0.06 seconds.
C) 45 milliseconds.
D) 2 millimeters.
B) 0.06 seconds.
If a patient's ECG rhythm shows any artifact, you should:
A) ensure the electrodes are applied firmly to the skin.
B) remove the negative lead and reassess the cardiac rhythm.
C) reverse the limb leads to obtain a clearer ECG tracing.
D) place the ground lead in a different anatomic location.
A) ensure the electrodes are applied firmly to the skin.
In males, the QT interval is considered prolonged if it is ______ milliseconds or
longer.
A) 390
B) 450
C) 430
D) 400
B) 450
Normally, the ST segment should be:
A) invisible on a normal ECG tracing.
B) elevated by no more than 1 mm.
C) at the level of the isoelectric line.
D) depressed by no more than 2 mm.
C) at the level of the isoelectric line.
On the ECG graph paper, 6 seconds is represented by how many large boxes?
A) 50
B) 40
C) 20
D) 30
D) 30
On the ECG graph paper, amplitude is measured in _____________ and width is
measure in ____________.
A) seconds, centimeters
B) milliseconds, millimeters
C) centimeters, seconds
D) millimeters, milliseconds
D) millimeters, milliseconds
Q waves are considered abnormal or pathologic if they are:
A) present in a patient who is experiencing chest pressure or discomfort.
B) greater than 0.02 seconds wide and consistently precede the R wave.
C) not visible in leads I or II when the QRS gain sensitivity is increased.
D) more than one-third the overall height of the QRS complex in lead II.
D) more than one-third the overall height of the QRS complex in lead II.
The brief pause between the P wave and QRS complex represents:
A) the period of time when the atria are repolarizing.
B) a momentary conduction delay at the AV node.
C) depolarization of the inferior part of the atria.
D) full dispersal of electricity throughout both atria.
D) full dispersal of electricity throughout both atria.
The duration of the QRS complex should be ____ milliseconds or less in a healthy
adult.
A) 120
B) 100
C) 110
D) 130
C) 110
The normal P wave duration is less than ___ milliseconds and the amplitude is less than ___ millimeters tall.
A) 140; 4.0
B) 120; 3.0
C) 130; 3.5
D) 110; 2.5
D) 110; 2.5
The PR interval should be no shorter than ____ seconds and no longer than ____
seconds in duration.
A) 0.14, 0.30
B) 0.12, 0.20
C) 0.16, 0.40
D) 0.18, 2.0
B) 0.12, 0.20
