Question 1

Calculate the heart rate for the ECG tracing below.

A) 60 bpm
B) 85 bpm
C) 115 bpm
D) 140 bpm

Accepted Answer

The answer of Calculate the heart rate for the ECG...

Question 2

The morphology of a normal S wave is a(n) ______________.
A) small, negative, spiked deflection
B) asymmetrical appearance
C) large, positive, spiked deflection in Lead II
D) small curved positive wave in Lead II

Accepted Answer

The S wave in an ECG is characterized as a small, negative, spiked deflection, representing the final part of ventricular depolarization.

Question 3

What segment represents a conduction delay "time period" between ventricular depolarization and ventricular repolarization?
A) ST segment
B) PR segment
C) TP segment
D) PRI interval

Accepted Answer

The ST segment represents the period between ventricular depolarization and repolarization, indicating a time when the ventricles are electrically neutral.

Question 4

Which of the following waves peaks at the end of ventricular diastole and the start of systole?
A) R wave
B) T wave
C) R wave.
D) S wave

Accepted Answer

The R wave peaks at the end of ventricular diastole and the start of systole.

Question 5

When the sinoatrial node begins the electrical impulse, which of the following waves is created on the grid as both the right and left atria are depolarized?
A) R wave
B) Q wave
C) P wave
D) S wave

Accepted Answer

The P wave on an electrocardiogram (ECG) represents the depolarization of the atria, which occurs when the sinoatrial node initiates the electrical impulse. This leads to the contraction of both the right and left atria.

Question 6

A waveform that appears to _________ is one that appears abnormally rapid and sometimes erratic.
A) flutter
B) spike
C) fibrillate
D) curve

Accepted Answer

Flutter is a waveform that appears abnormally rapid and sometimes erratic.

Question 7

A heart in ____________ can become deadly with the loss of blood circulation and pulse.
A) tachycardia
B) fibrillation mode
C) sinus rhythm
D) defibrillation mode

Accepted Answer

Fibrillation mode refers to a rapid, irregular heart rhythm, particularly in the atria or ventricles. This condition disrupts the heart's ability to pump blood effectively, leading to a severe reduction in blood circulation and can be life-threatening if not treated promptly.

Question 8

What type of waveforms cross the isoelectric line with part of the waveform being upright and part of the waveform appears as inverted?
A) Fluttered
B) Notched
C) Fibrillated
D) Biphasic

Accepted Answer

Biphasic waveforms cross the isoelectric line, displaying both an upright and an inverted component, which distinguishes them from other waveform types.

Question 9

What wave is thought to represent repolarization of the Purkinje fibers?
A) T
B) S
C) U
D) R

Accepted Answer

The U wave is thought to represent the repolarization of the Purkinje fibers in the heart.

Question 10

The ventricular relaxation phase is also called ventricular ____________.
A) repolarization
B) depolarization
C) systole
D) diastole

Accepted Answer

The ventricular relaxation phase is referred to as ventricular diastole, during which the heart's ventricles relax and fill with blood following contraction.

Question 11

What is measured with calipers?
A) Heart rhythm
B) Heart rate
C) R-R interval
D) Duration

Accepted Answer

Calipers are used to measure the duration of specific events or objects, particularly in physical dimensions. They are not used for measuring heart rhythm, heart rate, or R-R intervals, which are typically assessed using electrocardiograms (ECGs) or other heart monitoring equipment.

Question 12

Which of the following shows up on an ECG tracing as a curved or spiked line either above or below the isoelectric line?
A) Complex
B) Wave
C) Interval
D) Segment

Accepted Answer

Waves on an ECG tracing, such as the P wave, QRS complex, and T wave, are represented as curved or spiked lines that can appear above or below the isoelectric line, reflecting the heart's electrical activity during various phases of the cardiac cycle.

Question 13

A(n) ___________ on the ECG strip is a "time period" with no electrical activity occurring between waves, and if normal, looks like a flat line.
A) artifact
B) deflection
C) interval
D) segment

Accepted Answer

A segment on an ECG strip represents a period with no electrical activity occurring between waves, typically appearing as a flat line when normal. This distinguishes it from artifacts, deflections, and intervals which have different meanings in the context of ECG interpretation.

Question 14

The normal T wave is usually what shape in appearance?
A) Symmetrical
B) Asymmetrical
C) Spiked
D) Curved

Accepted Answer

The normal T wave is usually asymmetrical in appearance, with the second half of the T wave being steeper than the first half.

Question 15

When the heart rhythm or heart rate is consistently or predictably irregular or abnormal, or absent, it is known as a(n)__________ .
A) sinus rhythm
B) arrhythmia
C) atrial systole
D) ventricular systole

Accepted Answer

Arrhythmia refers to a condition where the heart rhythm is irregular, abnormal, or absent, differing from the normal, predictable rhythm of the heart.

Question 16

The measurement of a wave starts when the wave departs the____________.
A) baseline
B) isoelectric line
C) vertical axis
D) horizontal axis

Accepted Answer

The measurement of a wave starts when the wave departs the isoelectric line, which is the baseline of the wave where there is no positive or negative deflection.

Question 17

Which of the following waves sometimes appears as a result of certain antiarrhythmic drug effects, drug toxicity, or electrolyte imbalances?
A) R wave
B) S wave
C) U wave
D) T wave

Accepted Answer

U waves can appear or become more prominent due to the effects of certain antiarrhythmic drugs, drug toxicity, or electrolyte imbalances, particularly hypokalemia.

Question 18

Which of the following limb lead reversal errors does this ECG tracing represent?

A) Reversal of left arm and left leg leads
B) Reversal of left arm and right arm leads
C) Reversal of right arm and right leg leads
D) Both arms and legs limb leads reversed

Accepted Answer

The answer of Which of the following limb lead reversal...

Question 19

Which of the following limb lead reversal errors does this ECG tracing represent?
A) Both arms and legs limb leads reversed
B) Reversal of left arm and right arm leads
C) Reversal of right arm and right leg leads
D) Reversal of left arm and right leg leads

Accepted Answer

Reversal of the left arm and right arm leads often results in a pattern where lead I shows inverted P waves, QRS complexes, and T waves, while leads II and III may show unusual patterns inconsistent with typical limb lead orientations. This is because the electrical view of the heart is essentially "flipped" across a vertical axis when the arm leads are switched.

Question 20

Which of the following precordial lead errors does this ECG tracing represent?

A) Reversal of V1 and V6
B) Reversal of V1 and V2
C) Reversal of right arm and right leg leads
D) Both arms and legs limb leads reversed

Accepted Answer

The answer of Which of the following precordial lead errors...

Quiz 7: Waveforms Rate Rhythm and Artifacts

Calculate the heart rate for the ECG tracing below.

The morphology of a normal S wave is a(n) ______________.

What segment represents a conduction delay "time period" between ventricular depolarization and ventricular repolarization?

Which of the following waves peaks at the end of ventricular diastole and the start of systole?

When the sinoatrial node begins the electrical impulse, which of the following waves is created on the grid as both the right and left atria are depolarized?

A waveform that appears to _________ is one that appears abnormally rapid and sometimes erratic.

A heart in ____________ can become deadly with the loss of blood circulation and pulse.

What type of waveforms cross the isoelectric line with part of the waveform being upright and part of the waveform appears as inverted?

What wave is thought to represent repolarization of the Purkinje fibers?

The ventricular relaxation phase is also called ventricular ____________.

What is measured with calipers?

Which of the following shows up on an ECG tracing as a curved or spiked line either above or below the isoelectric line?

A(n) ___________ on the ECG strip is a "time period" with no electrical activity occurring between waves, and if normal, looks like a flat line.

The normal T wave is usually what shape in appearance?

When the heart rhythm or heart rate is consistently or predictably irregular or abnormal, or absent, it is known as a(n) __________ .

The measurement of a wave starts when the wave departs the____________.

Which of the following waves sometimes appears as a result of certain antiarrhythmic drug effects, drug toxicity, or electrolyte imbalances?

Which of the following limb lead reversal errors does this ECG tracing represent?

Which of the following limb lead reversal errors does this ECG tracing represent?

Which of the following precordial lead errors does this ECG tracing represent?