Quiz EKG And Telemetry

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  • 1/113 Questions

    Normal duration of QRS complex?

    • 0.06 to 0.10 seconds
    • .04 to 0.90 seconds
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About This Quiz

Telemetry monitoring and EKGs both monitor a patient's heart activity. While the two systems are similar in many ways, they vary in some key areas. As such, it's not uncommon for people to wonder about the difference between what telemetry technicians and EKG technicians do. Take the test and see if you can note the difference.

Quiz EKG And Telemetry - Quiz

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  • 2. 

    Choose the correct placement of V1 :

    • 5th right intercostal space

    • V2

    • 4th right intercostal space

    • Where the sun don't shine

    Correct Answer
    A. 4th right intercostal space
    Explanation
    The correct placement of V1 is in the 4th right intercostal space. This is a standard placement for the V1 electrode in an ECG (electrocardiogram) test. The intercostal spaces are the spaces between the ribs, and the 4th right intercostal space refers to the space on the right side of the chest, between the 4th and 5th ribs. This placement allows for accurate measurement of the electrical activity of the heart from this specific location.

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  • 3. 

    What is the normal length in PR interval in both seconds and mm?

    • 0.12 to 0.18 seconds (3-5mm)

    • 0.12 to 0.20 seconds (3-5 mm)

    Correct Answer
    A. 0.12 to 0.20 seconds (3-5 mm)
    Explanation
    The normal length of the PR interval is 0.12 to 0.20 seconds (3-5 mm). This indicates the time it takes for the electrical signal to travel from the atria to the ventricles in the heart. A PR interval within this range suggests a normal conduction of the electrical impulses and proper coordination between the atria and ventricles.

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  • 4. 

    Premature atrial beat is every other beat 

    • Atrial Bigeminy

    • Atrial Trigeminy

    Correct Answer
    A. Atrial Bigeminy
    Explanation
    Atrial bigeminy is a cardiac arrhythmia characterized by premature atrial beats occurring every other beat. This means that after every normal beat, there is a premature beat originating from the atria. This results in a pattern of alternating normal and premature beats, hence the term "bigeminy." Atrial trigeminy, on the other hand, refers to premature atrial beats occurring every third beat. Since the given description matches atrial bigeminy, it is the correct answer.

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  • 5. 

    Midpoint between V2 and V4

    Correct Answer
    V3
    Explanation
    The midpoint between V2 and V4 would be V3. The question is asking for the point that lies exactly in the middle of V2 and V4, and that point is V3.

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  • 6. 

    An R-R interval represents what on the EKG?

    • Two complete cardiac cycles

    • Rest and Relaxation

    • One complete cardiac cycle

    • Inferior MI

    Correct Answer
    A. One complete cardiac cycle
    Explanation
    An R-R interval represents one complete cardiac cycle on an EKG. The R-R interval is the time between two consecutive R waves, which corresponds to the contraction and relaxation of the ventricles of the heart. This interval is used to measure the heart rate and assess the regularity of the heart rhythm.

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  • 7. 

    What would you typically see on EKG if a patient had Bundle Branch Block

    • Wide QRS

    • Narrow QRS

    • Spiked PR interval

    Correct Answer
    A. Wide QRS
    Explanation
    A bundle branch block is a condition where there is a delay or blockage in the electrical conduction through the bundle branches of the heart. This leads to a delay in the ventricles contracting, resulting in a widened QRS complex on an EKG. The QRS complex represents the depolarization of the ventricles, and a widened QRS indicates that the electrical impulse is taking longer to travel through the ventricles. Therefore, the correct answer is "Wide QRS."

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  • 8. 

    Name the placement for V4

    • Who cares

    • 5th intercostal space, anterior axillary line

    • 5th intercostal space, midclavicular line

    • 5th intercostal space midaxillary line

    Correct Answer
    A. 5th intercostal space, midclavicular line
    Explanation
    The correct answer is 5th intercostal space, midclavicular line. This is the correct placement for V4 in an ECG (electrocardiogram). V4 is typically placed in the 5th intercostal space, which is the space between the ribs, and it is positioned along the midclavicular line, which is a vertical line drawn down from the midpoint of the clavicle. This placement allows for accurate recording of the electrical activity of the heart from this specific lead.

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  • 9. 

    What view of the heart does V1-V4 give ?

    • Anterior

    • Posterior

    • Lateral

    Correct Answer
    A. Anterior
    Explanation
    V1-V4 leads in the electrocardiogram (ECG) provide a view of the anterior surface of the heart. These leads are placed on the chest in specific positions to capture electrical activity from the front of the heart. By analyzing the ECG waveform in these leads, healthcare professionals can assess the electrical conduction and function of the anterior part of the heart, including the left ventricle and the septum.

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  • 10. 

    What segment, if elevated or depressed, reveals a sign of serious pathology?

    • ST

    • PR

    • R-R

    • QT

    Correct Answer
    A. ST
    Explanation
    Elevation or depression of the ST segment on an electrocardiogram (ECG) is a significant sign of serious pathology. The ST segment represents the interval between ventricular depolarization and repolarization. Any abnormality in this segment can indicate myocardial infarction, ischemia, or other cardiac conditions. Therefore, the correct answer is ST.

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  • 11. 

    What wave represents ventricular repolarization?

    • U wave

    • P wave

    • Q wave

    • T wave

    Correct Answer
    A. T wave
    Explanation
    The T wave represents ventricular repolarization. During ventricular repolarization, the ventricles of the heart relax and reset their electrical charge in preparation for the next heartbeat. The T wave on an electrocardiogram (ECG) represents this phase of the cardiac cycle. It shows the electrical activity as the ventricles recover and return to their resting state.

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  • 12. 

    Upon inspiration, your HR _________, and upon expiration, your HR ____________ ?

    • Increases; decreases

    • Decreases; increases

    • Increases; increases

    Correct Answer
    A. Increases; decreases
    Explanation
    Just think= I for inspiration
    I for increase

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  • 13. 

    Vasovagal syncope is a reflex of ________response (dilates systemic arteries causing hypotension and slows SA node).

    • Parasympathetic

    • Sympathetic

    • Pathetic

    Correct Answer
    A. Parasympathetic
    Explanation
    Vasovagal syncope is a reflex that occurs when the parasympathetic nervous system is activated. This activation leads to the dilation of systemic arteries, causing a drop in blood pressure (hypotension). Additionally, it slows down the SA node, which is responsible for initiating the electrical signals that regulate the heart's rhythm. Therefore, the correct answer is parasympathetic.

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  • 14. 

    The 4th intercostal space, right side of the sternum

    Correct Answer
    V1
    Explanation
    V1 refers to the first lead of the electrocardiogram (ECG) placement on the chest. The placement of V1 is in the 4th intercostal space, which is the space between the ribs, on the right side of the sternum, which is the bone in the center of the chest. This specific placement allows for the accurate recording of electrical activity in the heart from this angle.

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  • 15. 

    What leads are considered inferior leads?

    • II, III, aVF

    • II, III, aVR

    • I,II,III

    • V1,II

    Correct Answer
    A. II, III, aVF
    Explanation
    II, III, and aVF leads are considered inferior leads in electrocardiography. The term "inferior" refers to the anatomical location of these leads on the body. These leads are placed on the lower part of the chest and abdomen. The inferior leads are useful for detecting abnormalities in the inferior wall of the heart, including the right ventricle and the inferior part of the left ventricle. They are particularly important in diagnosing conditions such as inferior myocardial infarction.

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  • 16. 

    What view of the heart does V5-V6 give ?

    • Left lateral view

    • Right lateral view

    • Mid axillary view

    Correct Answer
    A. Left lateral view
    Explanation
    V5-V6 electrodes are placed on the left side of the chest, specifically on the left anterior axillary line and left midaxillary line respectively. These positions provide a left lateral view of the heart. This view allows for the visualization of the left ventricle, left atrium, and the lateral walls of the heart. The electrical activity recorded from these electrodes helps in diagnosing conditions such as left ventricular hypertrophy and myocardial infarction in the lateral wall of the heart.

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  • 17. 

    This EKG finding is pathognomonic for which of the diseases below:  S1 Q3 T(inverted)3

    • Pulmonary Embolism

    • COPD

    Correct Answer
    A. Pulmonary Embolism
    Explanation
    The EKG finding of S1 Q3 T3 inversion is pathognomonic for pulmonary embolism. This specific pattern is commonly seen in patients with acute pulmonary embolism, where there is a deep S wave in lead I, a Q wave in lead III, and an inverted T wave in lead III. This finding is believed to be caused by right ventricular strain and acute right heart overload due to the obstruction of pulmonary arteries by a blood clot. It is important to recognize this EKG pattern as it can help in the early diagnosis of pulmonary embolism and prompt initiation of appropriate treatment.

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  • 18. 

    Name the correct placement of V2:

    • 4th left intercostal space

    • 4th right intercostal space

    • 5th left intercostal space

    • 5th right intercostal space

    Correct Answer
    A. 4th left intercostal space
    Explanation
    The correct placement of V2 is in the 4th left intercostal space. This is a specific location on the chest where the electrode for lead V2 is placed during an electrocardiogram (ECG) test. The ECG measures the electrical activity of the heart and helps diagnose various heart conditions. Placing the electrode in the correct position allows for accurate readings of the heart's electrical signals.

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  • 19. 

    You would typically see a peaked, tent like T wave in what condition?

    • Hyperkalemia

    • Hypokalemia

    • Hypercalemia

    • Hyponatremia

    Correct Answer
    A. Hyperkalemia
    Explanation
    T wave is a tent that holds K+ ions.
    Hyperkalemia has many K+ ions so is a tall tent
    Hypokalemia has little K+ ions so is a collapsed tent

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  • 20. 

    What part of the EKG is known as the "plateau phase", and represents the initial part of ventricular repolarization?

    • S Wave

    • ST Segment

    • PR interval

    Correct Answer
    A. ST Segment
    Explanation
    The ST segment of the EKG is known as the "plateau phase" and represents the initial part of ventricular repolarization. During this phase, the ventricles are in a state of electrical recovery and preparing for the next heartbeat. The ST segment is important in diagnosing various cardiac conditions, such as myocardial infarction, as any deviations from the normal baseline can indicate abnormalities in the heart's electrical activity.

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  • 21. 

    What is the best match for the following definition: a barely detectable rate change in sinus pacing related to inspiration and expiration ?

    • Atrial arrythmia

    • Atrioventricular arrythmia

    • Sinus arrythmia

    • Ventricular arrythmia

    Correct Answer
    A. Sinus arrythmia
    Explanation
    Sinus arrhythmia is the best match for the given definition. Sinus arrhythmia refers to a barely detectable rate change in the pacing of the heart's sinus node, which is influenced by the process of inspiration and expiration. This phenomenon causes the heart rate to slightly increase during inspiration and decrease during expiration. It is a normal variation in heart rhythm and is commonly observed in healthy individuals. Atrial arrhythmia, atrioventricular arrhythmia, and ventricular arrhythmia do not specifically involve rate changes related to inspiration and expiration, making them less suitable matches for the given definition.

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  • 22. 

    One large square is equal to what amount of time (and distance) on EKG? 

    • 2 sec/.5mm

    • 20 sec/5 mm

    • 0.02 sec/0.5mm

    • 0.2 sec/5mm

    Correct Answer
    A. 0.2 sec/5mm
    Explanation
    The correct answer is 0.2 sec/5mm. This means that one large square on an EKG represents a time interval of 0.2 seconds and a distance of 5 millimeters. The EKG measures the electrical activity of the heart, and each square on the EKG paper represents a specific time and distance measurement. Therefore, this answer correctly identifies the time and distance represented by one large square on the EKG.

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  • 23. 

    In which leads would you see a positive P wave?

    • I, II, III

    • AVL, AVF, V4-V6

    • V4-V6

    • I, II, AVL, AVF, V4-V6

    Correct Answer
    A. I, II, AVL, AVF, V4-V6
    Explanation
    The P wave represents atrial depolarization in an electrocardiogram (ECG). It is a small upward deflection before the QRS complex. A positive P wave indicates that the electrical activity is moving towards the positive electrode. In leads I, II, AVL, AVF, V4-V6, the positive electrode is positioned in a way that it can detect the atrial depolarization moving towards it, hence resulting in a positive P wave.

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  • 24. 

    One small square on an EKG is equivalent to how much time ( and what  distance)?

    • 0.04 sec (2mm)

    • 0.20 sec (1mm)

    • .04 sec (1mm)

    • .01 sec (1mm)

    Correct Answer
    A. .04 sec (1mm)
    Explanation
    In an EKG, the small squares on the graph paper represent a specific amount of time. The standard measurement is that one small square equals 0.04 seconds. Additionally, the small squares also represent a specific distance, with each small square measuring 1 millimeter. Therefore, the correct answer is ".04 sec (1mm)" as it accurately represents the time and distance measurement of one small square on an EKG.

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  • 25. 

    _____________ is an irregular rhythm produced by pacemaker activity wandering from SA node.

    • Sinoatrial pacemaker

    • Wandering pacemaker

    • ICD

    Correct Answer
    A. Wandering pacemaker
    Explanation
    Wandering pacemaker refers to an irregular rhythm that occurs when the pacemaker activity wanders away from the sinoatrial (SA) node, which is the normal pacemaker of the heart. In this condition, the pacemaker activity shifts between the SA node and other sites within the atria. This results in an irregularity in the heart's rhythm. Therefore, the correct answer is wandering pacemaker.

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  • 26. 

    ST segment elevation is a sign of:

    • Acute ischemic injury

    • COPD

    • Previous MI

    • Heart transplant

    Correct Answer
    A. Acute ischemic injury
    Explanation
    ST segment elevation on an electrocardiogram is a characteristic sign of acute ischemic injury. This elevation indicates that there is an obstruction in the blood flow to the heart, leading to inadequate oxygen supply to the affected area. This is commonly seen in conditions such as myocardial infarction (heart attack) where there is a sudden blockage in the coronary arteries supplying the heart muscle. It is an important diagnostic criterion for identifying acute ischemic injury and prompt medical intervention is required to restore blood flow and prevent further damage to the heart.

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  • 27. 

    The 5th intercostal space, midaxillary line, left side

    Correct Answer
    V6
    Explanation
    V6 refers to the 6th lead on a 12-lead electrocardiogram (ECG) and is placed in the 5th intercostal space, midaxillary line, on the left side of the chest. This lead provides information about the electrical activity of the heart from a specific angle, allowing for the detection of abnormalities or changes in the heart's rhythm or function. By placing V6 in this specific location, healthcare professionals can obtain a clear and accurate representation of the electrical activity in the left ventricle of the heart.

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  • 28. 

    In which lead is the P wave best seen?

    • II

    • III

    • AvF

    • V1

    Correct Answer
    A. II
    Explanation
    The P wave represents atrial depolarization in an electrocardiogram (ECG). Lead II is positioned between the right arm and left leg, providing a good view of the electrical activity in the heart's inferior region. This makes it the best lead to visualize the P wave, as it captures the atrial depolarization from a more optimal angle.

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  • 29. 

    The QT interval varies with heart rate,  and thus must be corrected. This corrected QT interval is also abbreviated as (QTc). This value is considered normal when it's less than half of the _____ interval at normal rates.

    • P-R

    • Q-R

    • R-R

    • P-P

    Correct Answer
    A. R-R
    Explanation
    The QT interval is a measure of the time it takes for the ventricles of the heart to contract and then recover. It is influenced by the heart rate, with shorter QT intervals at faster heart rates and longer QT intervals at slower heart rates. To account for this variability, the QT interval is corrected using the R-R interval, which represents the time between consecutive ventricular contractions. The corrected QT interval (QTc) is considered normal when it is less than half of the R-R interval at normal heart rates.

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  • 30. 

    The rate of Paroxysmal tachycardia is typically:

    • 350+ bpm

    • 150-250 bpm

    • 150-300 bpm

    • 250-350 bpm

    Correct Answer
    A. 150-250 bpm
    Explanation
    Paroxysmal tachycardia is a condition characterized by sudden, rapid heartbeats that start and stop abruptly. The correct answer, 150-250 bpm, indicates that the typical heart rate during an episode of paroxysmal tachycardia falls within this range. This means that during an episode, the heart rate can range from 150 beats per minute to 250 beats per minute.

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  • 31. 

    What does the Sympathetic system do to the heart, and what receptors are associated with it?

    • Constrict arteries (alpha 1 adrenergic receptors)

    • Constrict veins(beta 1 adrenergic receptors)

    • Relax arteries (alpha 1 adrenergic receptors)

    • Relax arteries (beta 1 adrenergic receptors)

    Correct Answer
    A. Constrict arteries (alpha 1 adrenergic receptors)
    Explanation
    The sympathetic system constricts arteries through the activation of alpha 1 adrenergic receptors. These receptors are responsible for causing vasoconstriction, which leads to a narrowing of the arteries. This response increases blood pressure and redirects blood flow to vital organs during times of stress or danger.

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  • 32. 

    What is another name for an automaticity focus that transiently escapes overdrive suppression to emit one beat (atrial, junctional, or ventricular)?

    • Escape rhythm

    • Escape beat

    • Aberrant beat

    • Aberrant rhythm

    Correct Answer
    A. Escape beat
    Explanation
    An escape beat is another name for an automaticity focus that transiently escapes overdrive suppression to emit one beat. It refers to a single beat that occurs when the normal pacemaker fails to fire or is suppressed, and another pacemaker site takes over temporarily. This can happen in the atria, junctional area, or ventricles, resulting in an escape beat.

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  • 33. 

    1. a _____ escape beat produces a large QRS. 2.a _______escape beat may produce a retrograde P' before/after/buried within QRS,  3. A______escape beat is followed by P',

    • 1. ventricular; 2. junctional; 3. atrial

    • 1. junctional; 2.atrial; 3. ventricular

    • 1. atrial; 2. junctional; 3. ventricular

    Correct Answer
    A. 1. ventricular; 2. junctional; 3. atrial
    Explanation
    A ventricular escape beat produces a large QRS complex because it originates from the ventricles, which have a larger muscle mass compared to the atria. A junctional escape beat may produce a retrograde P' wave before, after, or buried within the QRS complex because it originates from the AV junction, which can cause the electrical signal to travel backwards towards the atria. An atrial escape beat is followed by a P' wave because it originates from the atria, which results in a normal atrial depolarization before the ventricles contract.

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  • 34. 

    Which would you expect to see on EKG of a patient with normal axis?

    • Positive QRS in V1; negative QRS in Lead I

    • Positive QRS in lead I, positive QRS in lead AVF

    • Negative QRS in lead I, positive QRS in lead AVF

    Correct Answer
    A. Positive QRS in lead I, positive QRS in lead AVF
    Explanation
    A patient with normal axis would be expected to have a positive QRS in lead I and a positive QRS in lead AVF. This is because the electrical activity of the heart is normally directed towards the left ventricle, which generates a positive deflection in lead I. Additionally, the electrical activity is also directed towards the inferior part of the heart, which generates a positive deflection in lead AVF. Therefore, a patient with normal axis would exhibit positive QRS complexes in both lead I and lead AVF.

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  • 35. 

    If you see an inverted, symmetric T wave on an EKG, especially in V2-V6, what does the pt most likely have?

    • Ischemia

    • MI

    • Brugada

    • Digitalis toxicity

    Correct Answer
    A. Ischemia
    Explanation
    If an inverted, symmetric T wave is observed on an EKG, particularly in leads V2-V6, it is most likely indicative of ischemia. Ischemia refers to inadequate blood flow to the heart, which can be caused by a blockage or narrowing of the coronary arteries. This can lead to a lack of oxygen and nutrients reaching the heart muscle, resulting in changes in the EKG waveform, such as an inverted T wave. MI (myocardial infarction) and Brugada syndrome can also cause abnormal EKG findings, but in this case, the most likely cause is ischemia. Digitalis toxicity is not typically associated with inverted T waves.

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  • 36. 

    What disease shows  a HR > 100 bpm·and P' waves of various shape?      

    • Multifocal Atrial Tachycardia

    • Atrial Tachycardia

    • Paroxysmal Atrial Tachycardia

    Correct Answer
    A. Multifocal Atrial Tachycardia
    Explanation
    Different atrial foci firing= different p wave morphologies

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  • 37. 

    What leads are considered (left) lateral leads?

    • I aVR

    • I, aVL

    • V5,V6

    • II,III

    Correct Answer
    A. I, aVL
    Explanation
    The leads I and aVL are considered (left) lateral leads because they are positioned on the left side of the heart. These leads provide a view of the lateral wall of the left ventricle and help in diagnosing conditions such as myocardial infarction or ischemia affecting this area. The other leads mentioned, aVR, V5, V6, II, and III, are not considered lateral leads as they do not provide a direct view of the lateral wall.

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  • 38. 

    Which of the following best represents the normal height of the T WAVE?

    • 1/2-2/3 height of corresponding R wave

    • 1/3-2/3 height of corresponding R wave

    • 1/3-2/3 height of corresponding T wave

    • 1/2-2/3 height of corresponding T wave

    Correct Answer
    A. 1/3-2/3 height of corresponding R wave
    Explanation
    The T wave represents the repolarization of the ventricles in the heart. It is typically a positive deflection on an ECG waveform. The normal height of the T wave is usually between 1/3 and 2/3 of the height of the corresponding R wave. This means that the T wave is generally smaller in amplitude compared to the R wave.

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  • 39. 

     What would you most likely see in Left Ventricular Hypertrophy?

    • Right axis deviation

    • Deep S wave in V1 and Large R wave in V5

    • Steep R wave in V1 and Wide QRS in V5

    Correct Answer
    A. Deep S wave in V1 and Large R wave in V5
    Explanation
    In Left Ventricular Hypertrophy, there is an enlargement of the left ventricle of the heart. This causes changes in the electrical activity of the heart, which can be seen on an electrocardiogram (ECG). One of the characteristic findings in Left Ventricular Hypertrophy is a deep S wave in lead V1 and a large R wave in lead V5. This pattern is indicative of the changes in ventricular depolarization that occur in this condition.

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  • 40. 

    In an anterior hemiblock you would typically see_____ In a posterior hemiblock you would typically see ______

    • LAD; RAD

    • RAD; LAD

    Correct Answer
    A. LAD; RAD
    Explanation
    In an anterior hemiblock, the left anterior fascicle of the bundle branch is blocked, leading to delayed conduction of electrical signals in the left ventricle. This results in a characteristic pattern on an electrocardiogram (ECG) known as left axis deviation (LAD). On the other hand, in a posterior hemiblock, the right posterior fascicle of the bundle branch is blocked, causing delayed conduction in the right ventricle. This leads to right axis deviation (RAD) on the ECG. Therefore, the correct answer is LAD; RAD.

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  • 41. 

    In what leads do you see an "R wave progression"?

    • V1 to v6

    • V2 to v4

    • V5 to v6

    • V1 to v4

    Correct Answer
    A. V1 to v6
    Explanation
    The correct answer is v1 to v6. R wave progression refers to the gradual increase in the amplitude of R waves from lead V1 to V6 on an electrocardiogram (ECG). In a normal ECG, the R wave should progressively increase in amplitude from V1 to V6, indicating normal ventricular depolarization. This pattern can be disrupted in certain cardiac conditions such as myocardial infarction or ventricular hypertrophy. Therefore, the presence of R wave progression in leads V1 to V6 suggests a normal cardiac electrical conduction.

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  • 42. 

    Horizontal heart is most typically found in slender patients.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    *Vertical heart = found in tall/slender patients

    *Horizontal heart = found in obese patients due to abdomen pressure pushing up on diaphragm

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  • 43. 

    What disease do you see QRS complexes of small amplitude in all leads?

    • COPD

    • Posterior/Inferior MI

    • LAD

    • I hate ROME

    Correct Answer
    A. COPD
    Explanation
    In COPD (Chronic Obstructive Pulmonary Disease), the QRS complexes of small amplitude can be seen in all leads. This is due to the hyperinflation of the lungs, which causes the heart to be positioned more horizontally and further away from the chest leads. As a result, the electrical activity of the heart is attenuated, leading to smaller QRS complexes on the ECG. This finding is commonly observed in patients with COPD.

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  • 44. 

    Regarding the QRS complex: In which lead(s) would you see a TALL R wave?

    • V5

    • V6

    • V1,V2

    • V5,V6

    Correct Answer
    A. V5,V6
    Explanation
    The QRS complex represents the depolarization of the ventricles during a heartbeat. A tall R wave in the QRS complex indicates a strong depolarization of the ventricles. In leads V5 and V6, the electrodes are placed over the left ventricle, which is responsible for generating a large portion of the electrical activity during depolarization. Therefore, it is expected to see a tall R wave in leads V5 and V6.

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  • 45. 

    What is always the tail of the mean QRS vector?

    • SA Node

    • AV Node

    • IV septum

    Correct Answer
    A. AV Node
    Explanation
    The AV node is always the tail of the mean QRS vector. The mean QRS vector represents the average direction of electrical activity during ventricular depolarization. The AV node is located at the base of the atria and is responsible for delaying the electrical impulse before it is conducted to the ventricles. Since the mean QRS vector represents ventricular depolarization, the AV node, being the last structure involved in the conduction pathway before the ventricles, is always the tail of the mean QRS vector.

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  • 46. 

    The 5th intercostal space, midciavicular line left side is: 

    Correct Answer
    V4
  • 47. 

    What would cause an  inverted P’ immediately before premature QRS?

    • Premature junctional beat causing retrograde atrial depolarization

    • Premature junctional beat causing retrograde atrial repolarization

    • Premature atrial beat causing retrograde atrial depolarization

    Correct Answer
    A. Premature junctional beat causing retrograde atrial depolarization
    Explanation
    A premature junctional beat occurs when the electrical signals in the heart originate from the junction between the atria and the ventricles, instead of the normal site in the atria. In this case, the premature junctional beat causes an abnormal depolarization of the atria, which is conducted in a retrograde manner towards the atria. This retrograde atrial depolarization results in an inverted P' wave immediately before the premature QRS complex.

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  • 48. 

    The correct lead from the center of the heart to the postive pole of the right arm

    Correct Answer
    AVR
    Explanation
    AVR stands for Augmented Vector Right, which is a lead in the electrocardiogram (ECG) that records the electrical activity of the heart. The lead is placed on the right arm, specifically the positive pole of the right arm. AVR is one of the standard leads used in a 12-lead ECG, and it provides information about the electrical activity of the heart from a different angle compared to other leads. It helps in diagnosing various cardiac conditions and abnormalities.

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  • 49. 

    What plane does axis rotation take place in?

    • Horizontal

    • Vertical

    • Frontal

    Correct Answer
    A. Horizontal
    Explanation
    Axis rotation refers to the rotation of an object around a fixed axis. In this case, the question is asking about the plane in which this rotation takes place. The correct answer is horizontal because horizontal refers to the plane that is parallel to the ground or the horizon. Therefore, when an object rotates around its axis, it rotates in a horizontal plane.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 01, 2015
    Quiz Created by
    Al.lucas.paz
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