Master EKG Basics: An Interactive Learning Journey

Question 1

In standard clinical practice, which lead placement method is most commonly used for interpreting electrocardiograms (EKGs)?

Accepted Answer

12-lead EKG

Answer

Mason-Likar method

Answer

Frank lead system

Answer

Goldberger's Unipolar Lead System

Question 2

In a standard 12-lead EKG, which limb receives the negative (-) lead?

Accepted Answer

Right leg

Answer

Left arm

Answer

Chest

Answer

Back

Question 3

For a 12-lead EKG, which lead placement is correct?

Accepted Answer

RA, LA, LL, V1, V2, V3, V4, V5, V6, I, II, III

Answer

RA, LA, LL

Answer

RA, LA, LL, V1, V2, V3, V4, V5, I, II

Answer

RA, LA, LL, V1, V2, V3, V4, I, II, III

Question 4

Which of the following is **not** an electrical event in the cardiac cycle?

Accepted Answer

PR interval

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 5

Which of the following is NOT a standard wave in the cardiac cycle?

Accepted Answer

U wave

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 6

During the cardiac cycle, which component represents the phase of ventricular repolarization?

Accepted Answer

T wave

Answer

P wave

Answer

QRS complex

Answer

U wave

Question 7

Which of the following is NOT a component of an electrocardiogram (EKG) that directly shows the heart's electrical activity?

Accepted Answer

Heart rate

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 8

Which EKG waveform represents the electrical activity of the ventricles returning to their resting state?

Accepted Answer

T wave

Answer

P wave

Answer

QRS complex

Answer

U wave

Question 9

In Lead II of an electrocardiogram (ECG), which two limbs are connected by the electrodes?

Accepted Answer

Right arm and left leg

Answer

Right arm and left arm

Answer

Left arm and left leg

Answer

Right leg and left leg

Question 10

Which of the following is NOT a typical location for placing EKG electrodes?

Accepted Answer

Forehead

Answer

Chest

Answer

Arm

Answer

Leg

Question 11

In a normal sinus rhythm EKG, which component is typically absent?

Accepted Answer

U wave

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 12

Which component is NOT typically found in a normal sinus rhythm EKG?

Accepted Answer

U wave

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 13

Which component of an EKG does NOT directly represent a phase of the cardiac cycle?

Accepted Answer

PR interval

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 14

On an electrocardiogram (EKG), which cardiac event is represented by the P wave?

Accepted Answer

Atrial depolarization

Answer

Ventricular depolarization

Answer

Atrial repolarization

Answer

Ventricular repolarization

Question 15

Which sequence correctly represents the electrical events of the cardiac cycle on an EKG?

Accepted Answer

P wave, QRS complex, T wave

Answer

P wave, T wave, QRS complex

Answer

QRS complex, T wave, P wave

Answer

U wave, P wave, QRS complex, T wave

Question 16

During an electrocardiogram (EKG), which of these is NOT a typical lead placement location?

Accepted Answer

Forehead

Answer

Left arm

Answer

Right leg

Answer

Chest

Question 17

During the ventricular systole phase of the cardiac cycle, which event occurs?

Accepted Answer

Ventricular depolarization and ventricular contraction

Answer

Atrial depolarization and atrial contraction

Answer

Atrial repolarization and ventricular relaxation

Question 18

Which of the following is NOT a commonly used EKG electrode type in clinical practice?

Accepted Answer

Needle

Answer

Adhesive

Answer

Suction

Question 19

In a healthy heart, what is the correct order of electrical conduction?

Accepted Answer

SA node, AV node, Bundle of His, Bundle branches, Purkinje fibers

Answer

SA node, Bundle of His, Purkinje fibers, AV node, Bundle branches

Answer

AV node, SA node, Bundle of His, Bundle branches, Purkinje fibers

Answer

Bundle of His, SA node, AV node, Purkinje fibers, Bundle branches

Question 20

Where is NOT a typical location for placing EKG electrodes?

Accepted Answer

Head

Answer

Chest

Answer

Limbs

Question 21

In a normal sinus rhythm EKG, what is the correct order of waves?

Accepted Answer

P, Q, R, S, T

Answer

Q, R, S, T, P

Answer

S, T, P, Q, R

Answer

T, P, Q, R, S

Question 22

In electrocardiography, which electrode type is characterized by its self-adhesive nature and common usage?

Accepted Answer

Disposable

Answer

Reusable

Answer

Solid gel

Question 23

What distinguishes disposable EKG electrodes from reusable or adhesive electrodes?

Accepted Answer

Intended for one-time use and discarded afterward

Answer

Can be used repeatedly

Answer

Adhere to the patient's skin with a strong adhesive

Question 24

In a normal sinus rhythm, what does the T wave represent?

Accepted Answer

Ventricular repolarization

Answer

Ventricular depolarization

Answer

Both ventricular depolarization and repolarization

Answer

No electrical activity

Question 25

In a standard 12-lead EKG, which component represents the electrical activity of the ventricles contracting?

Accepted Answer

QRS complex

Answer

P wave

Answer

T wave

Question 26

Which of the following is NOT a commonly observed EKG wave?

Accepted Answer

U wave

Answer

P wave

Answer

Q wave

Answer

T wave

Question 27

What EKG component represents the electrical activity of the atria contracting?

Accepted Answer

P wave

Answer

QRS complex

Answer

T wave

Answer

U wave

Question 28

Which interval on an EKG measures the duration of ventricular depolarization and repolarization?

Accepted Answer

Q-T Interval

Answer

P-Q Interval

Answer

S-T Interval

Answer

R-R Interval

Question 29

Which sequence correctly represents the events of the cardiac cycle as seen on an EKG?

Accepted Answer

P wave, QRS complex, T wave

Answer

QRS complex, P wave, T wave

Answer

T wave, P wave, QRS complex

Answer

P wave, T wave, QRS complex

Question 30

In an EKG, which interval corresponds to the electrical activity of the ventricles contracting?

Accepted Answer

QRS complex duration

Answer

P-R interval

Answer

S-T segment

Answer

T-U interval

Question 31

In a normal sinus rhythm, what is the sequence of EKG wave deflections?

Accepted Answer

P-QRS-T

Answer

QRS-P-T

Answer

T-P-QRS

Answer

P-T-QRS

Question 32

In an EKG, which statement best describes the 'r' wave?

Accepted Answer

It's the first positive deflection in the QRS complex, indicating ventricular depolarization.

Answer

It's the second positive deflection in the QRS complex.

Answer

It's a negative deflection preceding the 'p' wave.

Question 33

What is the correct sequence of the cardiac cycle components?

Accepted Answer

P wave, QRS complex, T wave, U wave

Answer

QRS complex, P wave, T wave, U wave

Answer

P wave, T wave, QRS complex, U wave

Answer

U wave, P wave, QRS complex, T wave

Question 34

What does ST segment depression indicate on an EKG?

Accepted Answer

Myocardial ischemia

Answer

Acute myocardial infarction

Answer

Ventricular hypertrophy

Answer

No clinical significance

Question 35

Which EKG characteristics differentiate atrial fibrillation from ventricular tachycardia?

Accepted Answer

Atrial fibrillation: irregular atrial activity, no distinct P waves; Ventricular tachycardia: wide, bizarre QRS complexes

Answer

Atrial fibrillation: rapid, regular P waves; Ventricular tachycardia: narrow QRS complexes

Answer

Atrial fibrillation: narrow QRS complexes; Ventricular tachycardia: irregular atrial activity

Answer

Both atrial fibrillation and ventricular tachycardia: narrow QRS complexes, no distinct P waves

Question 36

In a standard 12-lead EKG, which two limbs does lead I measure the electrical activity between?

Accepted Answer

Right arm and left arm

Answer

Right arm and left leg

Answer

Left arm and right leg

Answer

Left arm and left leg

Question 37

In a standard 12-lead EKG, what is the primary purpose of the unipolar chest leads?

Accepted Answer

Detect myocardial ischemia or injury in specific heart areas

Answer

Monitor electrical activity from the right atrium

Answer

Assess electrical activity of the sinoatrial node

Answer

Determine the presence of arrhythmias

Question 38

What is the PR interval in an EKG?

Accepted Answer

Interval from the onset of the P wave to the start of the QRS complex

Answer

Interval from the end of the QRS complex to the start of the T wave

Answer

Interval from the start of the QRS complex to the end of the T wave

Answer

Interval from the onset of the P wave to the end of the T wave

Question 39

Which of the following is a defining feature of atrial fibrillation?

Accepted Answer

Irregular P waves

Answer

Regular P waves

Answer

Prolonged PR interval

Answer

Elevated ST segment

Question 40

What is the primary purpose of the ST segment in an EKG?

Accepted Answer

Assessment of ventricular repolarization

Answer

Measurement of atrial electrical activity

Answer

Evaluation of AV conduction

Answer

Detection of electrolyte imbalances

Question 41

What is the term for the technique used to record electrical activity on the skin's surface?

Accepted Answer

Electrocardiography

Answer

Electromyography

Answer

Electroencephalography

Answer

Echoencephalography

Question 42

Which component of the cardiac cycle is not always visible on a standard 12-lead EKG?

Accepted Answer

U wave

Answer

P wave

Answer

QRS complex

Answer

T wave

Question 43

In an EKG, what is the typical appearance of the P wave in lead II during normal sinus rhythm?

Accepted Answer

Upright

Answer

Inverted

Answer

Biphasic

Answer

Absent

Question 44

Which EKG lead placement is specifically designed to monitor the electrical activity of the right atrium?

Accepted Answer

Lead aVR

Answer

Lead I

Answer

Lead II

Answer

Lead III

Question 45

Which condition is mainly linked to ST segment depression on an EKG?

Accepted Answer

Myocardial ischemia

Answer

Myocardial infarction

Answer

Ventricular hypertrophy

Answer

Normal finding

Question 46

Which lead placement method is NOT used in a standard 12-lead EKG?

Accepted Answer

Esophageal leads

Answer

Limb leads

Answer

Chest leads

Answer

Intracardiac leads

Question 47

What is the name of the **tallest** upright deflection on an EKG?

Accepted Answer

R wave

Answer

P wave

Answer

Q wave

Answer

T wave

Question 48

Which interval on an EKG represents the period of **ventricular relaxation**?

Accepted Answer

ST segment

Answer

PR interval

Answer

QRS complex

Answer

QT interval

Question 49

Which of the following is a type of **supraventricular tachycardia**?

Accepted Answer

Atrial fibrillation

Answer

Ventricular tachycardia

Answer

Bradycardia

Answer

Tachycardia

Question 50

What is the **initial step** in interpreting an EKG?

Accepted Answer

Identify the rhythm strip

Answer

Measure the heart rate

Answer

Analyze the intervals and segments

Answer

Look for any abnormalities

Question 51

The P wave represents which of the following events in the cardiac cycle?

Accepted Answer

Atrial contraction

Answer

Ventricular contraction

Answer

Delay at the atrioventricular node

Answer

Repolarization of the ventricles

Question 52

Which interval on an EKG measures the electrical activity from the start of the QRS complex to the end of the T wave?

Accepted Answer

QT interval

Answer

PR interval

Answer

RR interval

Answer

ST segment

Question 53

What is the primary purpose of Lead II in an EKG?

Accepted Answer

Monitoring electrical activity in the frontal plane

Answer

Monitoring electrical activity in the transverse plane

Answer

Monitoring electrical activity in the sagittal plane

Answer

Monitoring electrical activity in all three planes

Question 54

In a normal EKG, which wave is typically inverted?

Accepted Answer

Q wave

Answer

P wave

Answer

T wave

Answer

R wave

Question 55

Which segment on an EKG extends from the end of the S wave to the onset of the T wave?

Accepted Answer

ST segment

Answer

PR segment

Answer

QT segment

Answer

TP segment

Question 56

Which lead provides electrical activity readings from the apex of the heart?

Accepted Answer

Lead V5

Answer

Lead I

Answer

Lead II

Answer

Lead III

Question 57

A prolonged PR interval on an EKG may indicate:

Accepted Answer

A conduction delay within the heart

Answer

An acute myocardial infarction

Answer

An electrolyte imbalance

Answer

No clinically significant condition

Question 58

What is the name of the positive deflection that represents ventricular depolarization on an EKG?

Accepted Answer

R wave

Answer

P wave

Answer

Q wave

Answer

S wave

Question 59

What is the PQ interval on an EKG?

Accepted Answer

From the beginning of the P wave to the beginning of the QRS complex

Answer

From the beginning of the Q wave to the end of the T wave

Answer

From the end of the P wave to the end of the T wave

Answer

From the beginning of the QRS complex to the end of the T wave

Question 60

What is the potential significance of an elevated ST segment on an EKG?

Accepted Answer

Possible myocardial ischemia

Answer

Normal finding

Answer

Arrhythmia

Answer

Congestive heart failure

Question 61

What is the main purpose of defibrillation pads?

Accepted Answer

To deliver an electrical shock to the heart

Answer

To monitor the heart rhythm

Answer

To record the EKG

Answer

To provide chest compressions

Question 62

What is the standard paper speed typically used for EKG interpretation?

Accepted Answer

50 mm/sec

Answer

25 mm/sec

Answer

75 mm/sec

Answer

100 mm/sec

Question 63

Which limb lead records electrical activity from the inferior aspect of the heart?

Accepted Answer

Lead III

Answer

Lead I

Answer

Lead II

Answer

Lead aVR

Question 64

What is the term for the initial positive deflection on an EKG?

Accepted Answer

P wave

Answer

QRS complex

Answer

T wave

Answer

U wave