Question 1

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead VS1U1B12S1U1B0 is shown. 
-What is her diagnosis?

Accepted Answer

B

Question 2

Which of the following statements about a premature atrial contraction is true?

Accepted Answer

Premature atrial contractions (PACs) are more likely to occur in individuals who consume large amounts of caffeine. Caffeine is a stimulant that can increase heart rate and lead to irregular heart rhythms, including PACs.

Question 3

Which of the following decrease the risk of occurrence of ventricular fibrillation?

Accepted Answer

D

Question 4

A 50-year-old man has been having fainting "spells" for about 2 weeks. During the fainting episodes, his electrocardiogram shows a ventricular beat of 25 per minute and 100 P waves per minute. After about 30 seconds of fainting a normal sinus rhythm reoccurs. What is his likely diagnosis?

Accepted Answer

The symptoms and ECG findings suggest Stokes-Adams syndrome, which is characterized by sudden episodes of syncope due to transient arrhythmias, often associated with complete heart block (third-degree AV block).

Question 5

A 65-year-old man reported some unusual sensations in his chest. His blood pressure is 135/85 mm Hg, and he weighs 200 pounds. He had an electrocardiogram, which is shown below. What is his likely diagnosis?

Accepted Answer

The answer of A 65-year-old man reported some unusual sensations...

Question 6

A 48-year-old man had unusual sensations in his chest during exercise. His electrocardiogram is below, with lead aVF shown. What is the diagnosis?

Accepted Answer

The electrocardiogram shows a premature ventricular contraction (PVC), indicated by the early QRS complex that is wider than normal and has a different morphology than the normal QRS complexes. The QRS complex originates in the inferior part of the ventricle, as evidenced by the negative deflection in lead aVF. Premature contractions originating in the atrium or high in the atrioventricular node would have a different morphology and would not have a negative deflection in lead aVF. Premature contractions originating low in the atrioventricular node or in the base of the ventricle would also have a different morphology.

Question 7

Which of the following will usually result in an inverted P wave that occurs after the QRS complex?

Accepted Answer

Premature contractions originating low in the atrioventricular (AV) junction typically result in an inverted P wave that occurs after the QRS complex. This is because the impulse moves in a retrograde fashion to activate the atria after the ventricles, leading to the inversion and repositioning of the P wave.

Question 8

A 65-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels a little irregular. Standard limb lead III is shown. What is her likely diagnosis?

Accepted Answer

The answer of A 65-year-old woman had the following electrocardiogram...

Question 9

A 55-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels strong and at other times it feels weak. Standard limb lead II is shown.  What is her likely diagnosis?

Accepted Answer

The ECG shows a regular rhythm with a narrow QRS complex, indicating sinus rhythm. However, there are occasional dropped beats, which is indicative of a second-degree AV block. The fact that the dropped beats are not preceded by a lengthening PR interval suggests that this is a Mobitz type II block rather than a Mobitz type I (Wenckebach) block. The patient's symptoms of alternating strong and weak pulse are consistent with intermittent AV block.

Question 10

A 50-year-old man has a blood pressure of 140/85 mm Hg and weighs 200 lbs. He reports that he is not feeling well. His electrocardiogram has no P waves, and he has a heart rate of 42 beats/min. What is his condition?

Accepted Answer

The answer of A 50-year-old man has a blood pressure...

Question 11

A 70-year-old woman had an electrocardiogram taken at her local hospital, and the diagnosis was atrial fibrillation. Which of the following is likely in someone with atrial fibrillation?

Accepted Answer

In atrial fibrillation, the atria are quivering instead of contracting normally, leading to the absence of P waves on the electrocardiogram. Ventricular fibrillation is a life-threatening arrhythmia that is not commonly associated with atrial fibrillation. The rate of ventricular contraction in atrial fibrillation is irregular and may be fast or slow. The atrial "a" wave may be absent or very small in atrial fibrillation. The volume of the atria is not typically affected by atrial fibrillation.

Question 12

-Circus movements in the ventricle can lead to ventricular fibrillation. Which of the following conditions in the ventricular muscle will increase the tendency for circus movements?

Accepted Answer

Decreased conduction velocity can lead to circus movements because it allows time for reentrant circuits to form, increasing the risk of ventricular fibrillation.

Question 13

Which of the following decreases the risk of occurrence of ventricular fibrillation?

Accepted Answer

A lengthened ventricular refractory period decreases the risk of ventricular fibrillation by ensuring that the heart has enough time to reset itself between contractions and preventing abnormal electrical signals from being conducted. The other choices either have no effect on the risk of ventricular fibrillation or increase the risk.

Question 14

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead VS1U1B12S1U1B0 is shown. 
-What is her heart rate in beats per minute?

Accepted Answer

The heart rate is 60 beats per minute.

Question 15

Which of the following occurs after electrical shock of the heart with a 60-cycle alternating current?

Accepted Answer

Electrical shock of the heart with a 60-cycle alternating current can lead to a decreased ventricular refractory period. This is because the shock can disrupt the normal electrical activity of the heart, leading to alterations in the heart's refractory period, which is the period during which the heart muscle cannot be re-excited.

Question 16

A forty-year-old man reported to his cardiologist that he had unusual feelings in his chest after drinking his fourth cup of coffee in the morning. The cardiologist recorded the following electrocardiogram during an exercise stress test. Leads II and III are shown. What is the likely diagnosis?

Accepted Answer

The answer of A forty-year-old man reported to his cardiologist...

Quiz 13: Cardiac Arrhythmias and Their Electrocardiographic Interpretation

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V₂ is shown. -What is her diagnosis?

Which of the following statements about a premature atrial contraction is true?

Which of the following decrease the risk of occurrence of ventricular fibrillation?

A 50-year-old man has been having fainting "spells" for about 2 weeks. During the fainting episodes, his electrocardiogram shows a ventricular beat of 25 per minute and 100 P waves per minute. After about 30 seconds of fainting a normal sinus rhythm reoccurs. What is his likely diagnosis?

A 65-year-old man reported some unusual sensations in his chest. His blood pressure is 135/85 mm Hg, and he weighs 200 pounds. He had an electrocardiogram, which is shown below. What is his likely diagnosis?

A 48-year-old man had unusual sensations in his chest during exercise. His electrocardiogram is below, with lead aVF shown. What is the diagnosis?

Which of the following will usually result in an inverted P wave that occurs after the QRS complex?

A 65-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels a little irregular. Standard limb lead III is shown. What is her likely diagnosis?

A 55-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels strong and at other times it feels weak. Standard limb lead II is shown. What is her likely diagnosis?

A 50-year-old man has a blood pressure of 140/85 mm Hg and weighs 200 lbs. He reports that he is not feeling well. His electrocardiogram has no P waves, and he has a heart rate of 42 beats/min. What is his condition?

A 70-year-old woman had an electrocardiogram taken at her local hospital, and the diagnosis was atrial fibrillation. Which of the following is likely in someone with atrial fibrillation?

Which of the following decreases the risk of occurrence of ventricular fibrillation?

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V₂ is shown. -What is her heart rate in beats per minute?

Which of the following occurs after electrical shock of the heart with a 60-cycle alternating current?

A forty-year-old man reported to his cardiologist that he had unusual feelings in his chest after drinking his fourth cup of coffee in the morning. The cardiologist recorded the following electrocardiogram during an exercise stress test. Leads II and III are shown. What is the likely diagnosis?

Quiz 13: Cardiac Arrhythmias and Their Electrocardiographic Interpretation

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V2 is shown. -What is her diagnosis?

Which of the following statements about a premature atrial contraction is true?

Which of the following decrease the risk of occurrence of ventricular fibrillation?

A 50-year-old man has been having fainting "spells" for about 2 weeks. During the fainting episodes, his electrocardiogram shows a ventricular beat of 25 per minute and 100 P waves per minute. After about 30 seconds of fainting a normal sinus rhythm reoccurs. What is his likely diagnosis?

A 65-year-old man reported some unusual sensations in his chest. His blood pressure is 135/85 mm Hg, and he weighs 200 pounds. He had an electrocardiogram, which is shown below. What is his likely diagnosis?

A 48-year-old man had unusual sensations in his chest during exercise. His electrocardiogram is below, with lead aVF shown. What is the diagnosis?

Which of the following will usually result in an inverted P wave that occurs after the QRS complex?

A 65-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels a little irregular. Standard limb lead III is shown. What is her likely diagnosis?

A 55-year-old woman had the following electrocardiogram recorded at her annual physical. She reported to her doctor that sometimes her pulse rate feels strong and at other times it feels weak. Standard limb lead II is shown. What is her likely diagnosis?

A 50-year-old man has a blood pressure of 140/85 mm Hg and weighs 200 lbs. He reports that he is not feeling well. His electrocardiogram has no P waves, and he has a heart rate of 42 beats/min. What is his condition?

A 70-year-old woman had an electrocardiogram taken at her local hospital, and the diagnosis was atrial fibrillation. Which of the following is likely in someone with atrial fibrillation?

-Circus movements in the ventricle can lead to ventricular fibrillation. Which of the following conditions in the ventricular muscle will increase the tendency for circus movements?

Which of the following decreases the risk of occurrence of ventricular fibrillation?

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V2 is shown. -What is her heart rate in beats per minute?

Which of the following occurs after electrical shock of the heart with a 60-cycle alternating current?

A forty-year-old man reported to his cardiologist that he had unusual feelings in his chest after drinking his fourth cup of coffee in the morning. The cardiologist recorded the following electrocardiogram during an exercise stress test. Leads II and III are shown. What is the likely diagnosis?

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V₂ is shown. -What is her diagnosis?

Use the following information to answer Following Questions : A 60-year-old woman was admitted to the emergency department after an automobile accident, where the following electrocardiogram was taken. Chest lead V₂ is shown. -What is her heart rate in beats per minute?