EKG Final Quiz
During the course of the year we have learnt a lot on the use and application of the EKG machine. With the finals just around the corner it is paramount to get some review questions to jog your memory. The quiz below is designed for just that. Give it a try and all the best!
Questions and Answers
- 1.
What is the name of the smallest part of the lungs responsible for gas exchange?
- A.
Villi
- B.
Alveoli
- C.
Intestine
- D.
Pockets
Correct Answer
B. AlveoliExplanation
The correct answer is Alveoli. The alveoli are tiny air sacs located at the end of the bronchioles in the lungs. They are responsible for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. The thin walls of the alveoli allow for efficient diffusion of gases, ensuring that oxygen is taken in and carbon dioxide is expelled during respiration. Villi are finger-like projections found in the small intestine that aid in the absorption of nutrients. Intestine and Pockets are not directly related to gas exchange in the lungs.Rate this question:
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- 2.
Which of the following events is present during ventricular relaxation?
- A.
Polarization
- B.
Depolarization
- C.
Repolarization
- D.
Isopolarization
Correct Answer
C. RepolarizationExplanation
During ventricular relaxation, the heart muscle is in a resting state and preparing for the next contraction. Repolarization refers to the process where the electrical charge of the heart muscle cells returns to its resting state after depolarization, which is the process of the cells contracting and generating electrical impulses. Therefore, repolarization is the correct answer as it occurs during ventricular relaxation.Rate this question:
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- 3.
Which of the following electrical events will result in contraction?
- A.
Polarization
- B.
Repolarization
- C.
Depolarization
- D.
Relaxationm
Correct Answer
C. DepolarizationExplanation
Depolarization is the electrical event that triggers muscle contraction. During depolarization, the electrical charge inside the muscle cell becomes more positive, causing the muscle fibers to contract. This occurs when the cell membrane's voltage-gated ion channels open, allowing an influx of positively charged ions, such as sodium, into the cell. This change in electrical charge initiates the release of calcium ions from the sarcoplasmic reticulum, which then leads to muscle contraction. Therefore, depolarization is the correct answer as it directly results in the contraction of muscles.Rate this question:
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- 4.
Normal sensitivity level for running EKG is:
- A.
0.8mv
- B.
1mv
- C.
2mv
- D.
1cm
Correct Answer
B. 1mvExplanation
The normal sensitivity level for running an EKG is 1mv. This means that the EKG machine is set to detect electrical activity in the heart at a level of 1 millivolt. This sensitivity level allows for accurate measurement and analysis of the heart's electrical signals, helping to diagnose any abnormalities or irregularities in the heart's rhythm.Rate this question:
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- 5.
What is the measurement of the time presented by one small square on the EKG is:
- A.
0.20 sec
- B.
0.20 min
- C.
0.04 sec
- D.
4 seconds
Correct Answer
C. 0.04 secExplanation
The correct answer is 0.04 sec. This is the measurement of the time presented by one small square on the EKG. Each small square on the EKG graph represents 0.04 seconds of time. This measurement is important for accurately interpreting the electrical activity of the heart as recorded on the EKG.Rate this question:
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- 6.
AVR, aVL, and aVF are known as the:
- A.
Standard leads
- B.
Chest leads
- C.
Augmented leads
- D.
Bipolar leads
Correct Answer
C. Augmented leadsExplanation
aVR, aVL, and aVF are known as augmented leads because they are derived from the standard leads and provide additional information about the electrical activity of the heart from different angles or perspectives. These leads are created by combining different combinations of the standard leads to help detect abnormalities or specific areas of the heart that may be affected. Augmented leads are commonly used in electrocardiography to provide a more comprehensive assessment of the heart's electrical activity.Rate this question:
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- 7.
An electrocardiogram is a recording of the:
- A.
Electrical activity of the heart
- B.
Opening and closing of the valves of the heart
- C.
Force of the blood against the walls of the blood vessels
- D.
Contraction and relaxation of the ventricles
Correct Answer
A. Electrical activity of the heartExplanation
An electrocardiogram is a medical test that records the electrical activity of the heart. It measures the electrical signals that are generated each time the heart beats and provides information about the heart's rhythm and any potential abnormalities. This information is important in diagnosing and monitoring various heart conditions, such as arrhythmias, heart attacks, and heart failure. By analyzing the patterns on an electrocardiogram, healthcare professionals can assess the overall health and function of the heart.Rate this question:
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- 8.
Electrodes are also referred to as:
- A.
Sensors
- B.
Leads
- C.
Wires
- D.
Tracing
Correct Answer
A. SensorsExplanation
Electrodes are commonly known as sensors because they are used to detect and measure electrical signals in various applications. They are typically made of conductive materials and are placed on the surface of a body or object to pick up electrical activity. By converting these electrical signals into measurable data, sensors play a crucial role in fields such as medicine, engineering, and environmental monitoring. While electrodes can also be connected to leads or wires to transmit the signals, the term "sensors" encompasses their primary function of sensing and detecting electrical activity.Rate this question:
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- 9.
The heart normally beats each minute approximatley:
- A.
40-60 beats
- B.
60-80 beats
- C.
60-100 beats
- D.
None of the above
Correct Answer
C. 60-100 beatsExplanation
The correct answer is 60-100 beats because this range represents the normal resting heart rate for adults. A heart rate below 60 beats per minute is considered bradycardia, while a heart rate above 100 beats per minute is considered tachycardia. Therefore, the range of 60-100 beats per minute is considered the normal and healthy heart rate for most individuals.Rate this question:
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- 10.
Which side of the heart is a low-pressure system that pumps venous blood to the lungs?
- A.
Left
- B.
Right
Correct Answer
B. RightExplanation
The right side of the heart is a low-pressure system that pumps venous blood to the lungs. The right atrium receives deoxygenated blood from the body and then pumps it into the right ventricle. From there, the right ventricle pumps the blood to the lungs through the pulmonary artery. In the lungs, the blood picks up oxygen and gets rid of carbon dioxide before returning to the left side of the heart. The left side of the heart, on the other hand, is a high-pressure system that pumps oxygenated blood to the rest of the body.Rate this question:
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- 11.
_____________ is the ability of cardiac cells to spontaneously initiate an electrical impulse without being stimulated from another source (scuh as a nerve)
- A.
Excitability
- B.
Conductivity
- C.
Automaticity
- D.
Contractility
Correct Answer
C. AutomaticityExplanation
Automaticity refers to the ability of cardiac cells to generate electrical impulses on their own, without any external stimulation. This property allows the heart to maintain its own rhythm and initiate each heartbeat. Unlike other cells in the body, cardiac cells have the unique ability to depolarize spontaneously, creating an electrical signal that triggers the contraction of the heart muscle. This automaticity is crucial for the proper functioning of the heart and ensures a regular heartbeat.Rate this question:
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- 12.
Which of the following are possible causes of sinus tachycardia?
- A.
Hypothermia, hypovolemia
- B.
Hypoxia, calcium channel blocker overdose
- C.
Fever, pain, anxiety
- D.
Vomiting
Correct Answer
C. Fever, pain, anxietyExplanation
Sinus tachycardia is a condition characterized by a rapid heart rate originating from the sinus node in the heart. It can be caused by various factors, including fever, pain, and anxiety. When the body experiences fever, the heart rate increases as a response to the elevated body temperature. Similarly, pain and anxiety can also stimulate the sympathetic nervous system, leading to an increased heart rate. Therefore, fever, pain, and anxiety are possible causes of sinus tachycardia.Rate this question:
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- 13.
The QRS complex associated with a complete (third-degree) AV block is always wide.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The QRS complex associated with a complete (third-degree) AV block is not always wide. In a complete AV block, there is a complete dissociation between the atria and ventricles, resulting in the ventricles generating their own rhythm. This can lead to a wide QRS complex if the ventricles are depolarizing slowly, but it can also be narrow if the ventricles are depolarizing at a normal rate. Therefore, the statement that the QRS complex is always wide in a complete AV block is false.Rate this question:
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- 14.
The PR interval is constant in a second-degree AV block is always wide.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In a second-degree AV block, there is a delay or blockage in the electrical conduction between the atria and ventricles of the heart. This results in a prolonged PR interval on an electrocardiogram (ECG). The PR interval represents the time it takes for the electrical signal to travel from the atria to the ventricles. Therefore, in a second-degree AV block, the PR interval is always wide and consistent. This is why the correct answer is true.Rate this question:
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- 15.
The PR interval is constant in a second-degree AV block type II>
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In a second-degree AV block type II, the PR interval is indeed constant. This type of block occurs when some of the electrical signals from the atria fail to reach the ventricles. It is characterized by intermittent failure of the AV node to conduct atrial impulses to the ventricles. In this type of block, some P waves are conducted to the ventricles (resulting in a normal PR interval), while others are not (resulting in a dropped QRS complex). Therefore, the PR interval remains constant in this condition.Rate this question:
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- 16.
Second-degree AV blocks are examples of incomplete AV blocks.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Second-degree AV blocks are examples of incomplete AV blocks because in these types of blocks, there is a delay or interruption in the electrical signals between the atria and the ventricles of the heart. This results in some of the atrial impulses not being conducted to the ventricles, leading to a skipped heartbeat or irregular heart rhythm. This incomplete conduction can be seen on an electrocardiogram (ECG) as a pattern of dropped or blocked QRS complexes. Therefore, the statement "Second-degree AV blocks are examples of incomplete AV blocks" is true.Rate this question:
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- 17.
During a first-degree AV block, the PR intervals are completely variable because the atria and ventricles beat independently of each other.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
During a first-degree AV block, the PR intervals are prolonged but still consistent. This means that there is a delay in the conduction of electrical signals from the atria to the ventricles, resulting in a longer PR interval on an electrocardiogram. However, the delay is consistent and does not cause the atria and ventricles to beat independently of each other. Therefore, the statement that the PR intervals are completely variable during a first-degree AV block is false.Rate this question:
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- 18.
Second-degree AV block type I is likely to progress rapidly to a complete (third-degree) AV block without warning.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Second-degree AV block type I, also known as Wenckebach block, is characterized by a progressive lengthening of the PR interval until a QRS complex is dropped. It is typically a benign condition and does not usually progress to a complete (third-degree) AV block. In fact, second-degree AV block type I often occurs intermittently and can resolve spontaneously without any intervention. Therefore, the statement that it is likely to progress rapidly to a complete AV block without warning is false.Rate this question:
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- 19.
The QT interval is measured from the:
- A.
Beginning of the QRS complex to the beginning of the T wave
- B.
End of the Q wave to the beginning of the P wave
- C.
Beginning of the QRS complex to the end of the T wave
- D.
End of the T wave to the beginning of the P wave
Correct Answer
C. Beginning of the QRS complex to the end of the T waveExplanation
The QT interval is measured from the beginning of the QRS complex to the end of the T wave. This interval represents the time it takes for ventricular depolarization and repolarization to occur. The QRS complex represents ventricular depolarization, while the T wave represents ventricular repolarization. Therefore, measuring the interval from the beginning of the QRS complex to the end of the T wave provides information about the electrical activity of the ventricles during a cardiac cycle.Rate this question:
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- 20.
The lead from center of the heart to the positive left leg
- A.
II
- B.
III
- C.
AVF
- D.
AVR
Correct Answer
C. AVFExplanation
AVF stands for "Augmented Vector Foot". It is one of the standard leads used in electrocardiography. The lead is placed on the left foot, and it measures the electrical activity of the heart from the center of the heart to the positive left leg. AVF is important in determining the electrical axis of the heart and can help diagnose various cardiac conditions.Rate this question:
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- 21.
The lead from right arm to the left leg
- A.
II
- B.
III
- C.
AVR
- D.
AVF
Correct Answer
A. IIExplanation
The lead from the right arm to the left leg is known as lead II. This lead is obtained by placing the positive electrode on the left leg and the negative electrode on the right arm. Lead II is commonly used in electrocardiography to monitor the electrical activity of the heart. It provides a view of the electrical axis of the heart in the frontal plane and is helpful in diagnosing various cardiac conditions.Rate this question:
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- 22.
The lead from left arm to the right arm
- A.
I
- B.
II
- C.
AVL
- D.
AVF
Correct Answer
A. I -
- 23.
The lead from the center of the heart to the positive right arm
- A.
I
- B.
III
- C.
AVL
- D.
AVR
Correct Answer
D. AVRExplanation
The lead from the center of the heart to the positive right arm is known as the aVR lead. This lead records the electrical activity of the heart from the perspective of the right arm. It is considered a "unipolar" lead because it only measures the electrical activity in one direction. In the given options, AVR is the only lead that matches the description of the lead from the center of the heart to the positive right arm.Rate this question:
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- 24.
The lead from the left arm to the left leg.
- A.
I
- B.
III
- C.
II
- D.
AVF
Correct Answer
B. IIIExplanation
The answer III is correct because it represents the lead from the left arm to the left leg. In the given options, I represents the lead from the right arm to the left arm, II represents the lead from the right arm to the left leg, and AVF represents the lead from the right arm to the left leg. Therefore, the correct answer is III.Rate this question:
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- 25.
The R-R interval on the EKG tracing is 5 large squares, the heart rate is?
- A.
70
- B.
80
- C.
120
- D.
60
Correct Answer
D. 60Explanation
The R-R interval on an EKG tracing represents the time between two consecutive R waves, which corresponds to one complete cardiac cycle. In a normal EKG, each large square represents 0.2 seconds, so if the R-R interval is 5 large squares, it would be equal to 1 second (5 x 0.2 = 1). Since the heart rate is defined as the number of cardiac cycles per minute, a 1-second R-R interval would correspond to a heart rate of 60 beats per minute. Therefore, the correct answer is 60.Rate this question:
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- 26.
Murmur is an abnormal sound that may indicate:
- A.
Stroke
- B.
MI
- C.
Structural heart disease
- D.
Bronchitis
Correct Answer
C. Structural heart diseaseExplanation
Murmur is an abnormal sound that may indicate structural heart disease. This means that there may be a problem with the structure or function of the heart, such as a defect in the heart valves or the walls of the heart. A murmur is often heard when there is turbulence or abnormal blood flow in the heart, which can be caused by these structural abnormalities. Therefore, if a murmur is detected during a physical examination, it may be a sign of underlying structural heart disease.Rate this question:
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- 27.
How many electrodes are placed on the patient with Holter?
- A.
2
- B.
3
- C.
4
- D.
5
Correct Answer
D. 5Explanation
Holter monitoring is a continuous recording of the heart's activity for 24 to 48 hours. It requires the placement of electrodes on the patient's chest. Typically, a standard Holter monitor has five electrodes. These electrodes are strategically placed to capture the electrical signals of the heart from different angles and provide a comprehensive analysis of the heart's activity over the monitoring period.Rate this question:
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- 28.
Proper electrode placement for Holter monitoring is:
- A.
Anterior trunk of body
- B.
Upper extremities
- C.
Lower limbs
- D.
Posterior trunk of the body
Correct Answer
A. Anterior trunk of bodyExplanation
The proper electrode placement for Holter monitoring is on the anterior trunk of the body. This is because the anterior trunk provides the best location for capturing the electrical activity of the heart. Placing the electrodes on the upper extremities or lower limbs may not provide accurate readings, as the signals may be weaker or more distorted in these areas. Similarly, placing the electrodes on the posterior trunk of the body may not capture the electrical activity of the heart effectively. Therefore, the anterior trunk is the most appropriate location for electrode placement during Holter monitoring.Rate this question:
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- 29.
What is the correct order of chain of infection?
- A.
Transmission-susceptible host-source
- B.
Source-transmission-susceptible host
- C.
None of the above
- D.
Susceptible host-transportation-source
Correct Answer
B. Source-transmission-susceptible hostExplanation
The correct order of the chain of infection is source-transmission-susceptible host. In this order, the source refers to the origin of the infectious agent, such as a person or an object. Transmission refers to the transfer of the infectious agent from the source to a susceptible host, which can occur through direct contact, droplets, or other means. Finally, the susceptible host is the individual who is at risk of becoming infected. This order reflects the sequential steps in the transmission and acquisition of an infection.Rate this question:
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- 30.
The pounding or racing of the heart that the patient is aware of is called:
- A.
Arrhythmia
- B.
Ectopic beats
- C.
MI
- D.
Palpitation
Correct Answer
D. PalpitationExplanation
Palpitation refers to the sensation of a pounding or racing heart that a patient is aware of. It is a common symptom that can be caused by various factors, including stress, anxiety, caffeine, medication side effects, or underlying heart conditions. Arrhythmia refers to an abnormal heart rhythm, ectopic beats are extra heartbeats that occur outside the normal rhythm, and MI stands for myocardial infarction, which is a heart attack. However, none of these options specifically describe the awareness of the pounding or racing heart, making palpitation the correct answer.Rate this question:
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- 31.
The medical term for fainting is:
- A.
Syncope
- B.
Anoxia
- C.
Stasis
- D.
Angina
Correct Answer
A. SyncopeExplanation
Syncope is the correct medical term for fainting. It refers to a temporary loss of consciousness and posture caused by a lack of blood flow to the brain. This can occur due to various reasons such as low blood pressure, dehydration, heart problems, or sudden emotional stress. Anoxia refers to a complete lack of oxygen supply to the body's tissues, stasis refers to a slowing or stopping of the normal flow of bodily fluids, and angina refers to chest pain caused by reduced blood flow to the heart.Rate this question:
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- 32.
Electrical activity in the heart may be assessed by: i. ECG ii. Vital signs III. Pulse iv. EKG
- A.
I and iii
- B.
I only
- C.
I, ii, iii, iv
Correct Answer
C. I, ii, iii, ivExplanation
Electrical activity in the heart can be assessed by various methods. The ECG (Electrocardiogram) is a commonly used diagnostic tool that records the electrical signals produced by the heart. Vital signs, such as heart rate and rhythm, can also provide information about the heart's electrical activity. The pulse, which is the rhythmic expansion and contraction of arteries as blood is pumped through them, can also indicate the heart's electrical activity. Finally, the EKG (Electrocardiogram) is the same as an ECG and can be used to assess the heart's electrical activity. Therefore, all the options i, ii, iii, and iv are correct.Rate this question:
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- 33.
A 60 year old male patient has history of on and off chest pain. His resting ECG is normal. It is decided to put him thru an exercise stress test. Which of the following will be the target heart rate for this patient?
- A.
180 beats per minute
- B.
160 beats per minute
- C.
140 beats per minute
- D.
120 beats per minute
Correct Answer
B. 160 beats per minuteExplanation
The target heart rate for an exercise stress test is usually calculated as 85% of the maximum heart rate. The maximum heart rate can be estimated by subtracting the person's age from 220. In this case, the patient is 60 years old, so the estimated maximum heart rate is 220 - 60 = 160 beats per minute. Therefore, the target heart rate for this patient would be 85% of 160, which is 136 beats per minute. Since none of the given options match exactly, the closest option would be 140 beats per minute.Rate this question:
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- 34.
This part of the conduction system of the heart is located at the superior portion of the interventricular septum and has the ability to function as a pacemaker with an intrinsic firing rate of 40-60 beats per minute.
- A.
SA node
- B.
AV node
- C.
Bundle of His
- D.
Purkinje fibers
Correct Answer
B. AV nodeExplanation
The AV node is located at the superior portion of the interventricular septum and has the ability to function as a pacemaker with an intrinsic firing rate of 40-60 beats per minute. The SA node is the primary pacemaker of the heart, but if it fails, the AV node can take over and initiate the heartbeat. The Bundle of His and Purkinje fibers are responsible for transmitting the electrical signals to the ventricles, but they do not have the ability to function as a pacemaker.Rate this question:
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- 35.
Which of the following is an indication for stress testing?
- A.
Angina at rest
- B.
Acute myocardial infarction
- C.
Severe hypertension
- D.
Evaluation of chest pain in a patient with normal baseline EKG
Correct Answer
D. Evaluation of chest pain in a patient with normal baseline EKGExplanation
An indication for stress testing is the evaluation of chest pain in a patient with a normal baseline EKG. Stress testing is commonly used to assess the presence of coronary artery disease in patients who are experiencing chest pain or other symptoms suggestive of heart disease. In this scenario, the patient's normal baseline EKG suggests that there may not be any obvious abnormalities at rest. However, stress testing can help to identify any underlying cardiac issues that may be causing the chest pain when the heart is under stress.Rate this question:
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- 36.
Which of the following is considered a negative Holter?
- A.
Pauses
- B.
Bradycardias or tachycardias
- C.
Severe hypertension
- D.
Evaluation of chest pain in a patient with normal baseline EKG
Correct Answer
D. Evaluation of chest pain in a patient with normal baseline EKGExplanation
A negative Holter refers to a normal result from a Holter monitor test, which is used to evaluate heart rhythm and detect any abnormalities. In this context, the other options mentioned - pauses, bradycardias or tachycardias, and severe hypertension - are all considered positive findings or abnormalities that may be detected during a Holter test. However, evaluating chest pain in a patient with a normal baseline EKG is not considered a negative Holter because it is a valid reason to perform the test even if the baseline EKG is normal.Rate this question:
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- 37.
The number of R waves in a six-second strip is 9. The heart rate is:
- A.
72 per minute
- B.
45 per minute
- C.
90 per minute
- D.
54 per minute
Correct Answer
C. 90 per minuteExplanation
The number of R waves in a six-second strip is 9. Since each R wave represents one heartbeat, we can calculate the heart rate by multiplying the number of R waves by 10 (to account for the fact that there are 10 six-second intervals in a minute). Therefore, 9 R waves in 6 seconds would correspond to 90 R waves per minute, indicating a heart rate of 90 beats per minute.Rate this question:
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- 38.
Mr. Adam Edwards came to the clinic complaining of occasional chest pains, substernal in location and radiating to the left arm. The physician prescribed him medication to be taken during such chest pain episodes. A few days later, the patient came back with complaints ofheadaches occuring after taking the medication. The medication prescribed is most likely:
- A.
Procainamide
- B.
Propranolol
- C.
Nitroglycerin
- D.
Digitalis
Correct Answer
C. NitroglycerinExplanation
Nitroglycerin is the most likely medication prescribed for Mr. Adam Edwards based on his symptoms. Chest pain that radiates to the left arm is a common symptom of angina, and nitroglycerin is commonly prescribed to relieve angina symptoms. Nitroglycerin works by relaxing and widening the blood vessels, improving blood flow and reducing chest pain. Headaches are a common side effect of nitroglycerin, which explains Mr. Edwards' complaint after taking the medication.Rate this question:
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- 39.
The following valves are called semilunar because they have half-moon shaped cusps:
- A.
Pulmonic and tricuspid valves
- B.
Aortic and mitral valves
- C.
Pulmonic and mitral valves
- D.
Aortic and pulmonic valves
Correct Answer
D. Aortic and pulmonic valvesExplanation
The correct answer is Aortic and pulmonic valves. These valves are called semilunar because they have half-moon shaped cusps. The aortic valve is located between the left ventricle and the aorta, while the pulmonic valve is located between the right ventricle and the pulmonary artery. The half-moon shape of their cusps allows for efficient blood flow and prevents backflow of blood into the ventricles.Rate this question:
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- 40.
Which of the following is incorrect of the augmented unipolar extremity leads?
- A.
They represent the difference in the electrical potential between two extremities.
- B.
The midpoint between two lim,bs is used as a negative reference point.
- C.
Only one electrode from one limb makes a lead.
- D.
The amplitude of deflections is increased by 50%
Correct Answer
A. They represent the difference in the electrical potential between two extremities.Explanation
The augmented unipolar extremity leads do not represent the difference in electrical potential between two extremities. Instead, they use the midpoint between two limbs as a negative reference point. Only one electrode from one limb makes a lead, and the amplitude of deflections is increased by 50%.Rate this question:
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- 41.
This is an arrhythmia produced by an electrical impulse originasting from a site other than the sinus node:
- A.
Preexctation syndromes
- B.
Arrhythmia of sinus origin
- C.
Conduction blocks
- D.
Ectopic rhythms
Correct Answer
D. Ectopic rhythmsExplanation
Ectopic rhythms refer to abnormal electrical impulses that originate from a site other than the sinus node, which is the normal pacemaker of the heart. These abnormal impulses can disrupt the normal rhythm of the heart, resulting in arrhythmias. Therefore, the correct answer is ectopic rhythms.Rate this question:
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- 42.
Which of the following statements is incorrect regarding the limb leads?
- A.
Electrodes and leads are applied to the right and left arms and legs.
- B.
The right leg functions as a ground.
- C.
The right leg plays a significant role in the production of the electrocardiogram.
- D.
Where the elctrode is placed in the extremities will make no difference in the electricl potential recorded.
Correct Answer
C. The right leg plays a significant role in the production of the electrocardiogram.Explanation
The limb leads are used in electrocardiography to record electrical activity of the heart. The electrodes and leads are applied to the right and left arms and legs. The right leg does not play a significant role in the production of the electrocardiogram, as it functions as a ground. The electrical potential recorded is not affected by where the electrode is placed in the extremities.Rate this question:
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- 43.
The vertical axis of the EKG paper measures:
- A.
Time
- B.
Voltage/Amplitude
- C.
Rhythm
- D.
Heart rate
Correct Answer
B. Voltage/AmplitudeExplanation
The vertical axis of the EKG paper measures voltage/amplitude. This means that it represents the strength or intensity of the electrical signals generated by the heart. The EKG paper records these signals as waveforms, with the height of the waves indicating the voltage or amplitude. By measuring the voltage/amplitude, healthcare professionals can analyze the electrical activity of the heart and identify any abnormalities or irregularities.Rate this question:
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- 44.
A normal PR interval should measure:
- A.
.08-.12 seconds
- B.
- C.
.12-.20 seconds
- D.
>.20 seconds
Correct Answer
C. .12-.20 secondsExplanation
A normal PR interval should measure between .12 and .20 seconds. This interval represents the time it takes for an electrical impulse to travel from the atria (the upper chambers of the heart) to the ventricles (the lower chambers of the heart). If the PR interval is shorter or longer than this range, it may indicate an abnormality in the electrical conduction system of the heart.Rate this question:
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- 45.
The electrode is placed on the 4th intercostals space, left sterna border to create:
- A.
V1
- B.
V2
- C.
V4
- D.
V5
Correct Answer
B. V2Explanation
The electrode is placed on the 4th intercostal space, left sternal border to create V2. The placement of the electrode on this specific location allows for the accurate recording of electrical activity in the heart from this specific lead. Each lead in an ECG provides a different view of the heart's electrical activity, and V2 specifically looks at the electrical activity in the anterior wall of the left ventricle.Rate this question:
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- 46.
In a properly standardized EKG machine, 1mV should produce a deflection of:
- A.
10cm
- B.
10mm
- C.
1mm
- D.
0.1cm
Correct Answer
B. 10mmExplanation
In a properly standardized EKG machine, 1mV should produce a deflection of 10mm. This means that when 1 millivolt of electrical activity is recorded by the machine, it will result in a vertical deflection of 10 millimeters on the EKG graph. This deflection is used to measure the magnitude and direction of the electrical signals in the heart, allowing healthcare professionals to analyze the heart's rhythm and detect any abnormalities.Rate this question:
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- 47.
Which of the following correctly describes P wave?
- A.
This is thought to be due to repolarization of the Purkinje conduction system
- B.
It is the deflection produced by atrial depolarization
- C.
It is the deflection produced by ventricular depolarization
- D.
It is the deflection produced by ventricular repolarization
Correct Answer
B. It is the deflection produced by atrial depolarizationExplanation
The correct answer is "It is the deflection produced by atrial depolarization." The P wave on an electrocardiogram represents the depolarization of the atria, which is the electrical activation that causes the atria to contract. This is different from the QRS complex, which represents the depolarization of the ventricles. The statement about the repolarization of the Purkinje conduction system is incorrect, as the P wave does not represent repolarization.Rate this question:
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- 48.
Which procedure requires informed consent signed by a patient?
- A.
BP
- B.
Holter monitoring
- C.
Exercise Stress Test
Correct Answer
C. Exercise Stress TestExplanation
The procedure that requires informed consent signed by a patient is the Exercise Stress Test. Informed consent is necessary for this procedure as it involves physical exertion and potential risks to the patient's health. By signing the consent form, the patient acknowledges that they have been informed about the purpose, procedure, risks, and benefits of the test, and they agree to undergo it voluntarily. This ensures that the patient is fully aware of what they are consenting to and can make an informed decision about their participation in the test.Rate this question:
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- 49.
What is used to check BP?
- A.
Otoscope
- B.
EEG
- C.
PPE
- D.
Sphygmomanometer
Correct Answer
D. SphygmomanometerExplanation
A sphygmomanometer is used to check blood pressure (BP). It is a medical device that consists of an inflatable cuff, a measuring unit, and a pressure gauge. The cuff is wrapped around the upper arm, and the pressure in the cuff is gradually released while listening to the sounds of blood flow using a stethoscope or electronic sensors. This allows healthcare professionals to measure systolic and diastolic blood pressure, providing important information about a person's cardiovascular health. The other options listed, otoscope, EEG, and PPE, are not used for checking blood pressure.Rate this question:
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- 50.
In most patients, the SA and AV nodes are supplied by the ___coronary artery.
- A.
Left anterior descending
- B.
Right
- C.
Left circumflex
- D.
Left main
Correct Answer
B. RightExplanation
The SA and AV nodes are supplied by the right coronary artery in most patients. The right coronary artery is responsible for providing blood supply to the right side of the heart, including the SA and AV nodes. These nodes play a crucial role in regulating the electrical signals that control the heart's rhythm and rate.Rate this question:
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Oct 09, 2023Quiz Edited by
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Nov 10, 2012Quiz Created by
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