Knowledge Check: Introduction to ECG
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Question 1 of 10
1. Question
Where is electricity first generated in the heart?
Hint
Hint: Chapter 1, 00:35. The electric impulse in the heart is generated in the atria.
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Question 2 of 10
2. Question
Which of the following is a precordial lead?
Hint
Hint: Chapter 2, 1:01. The precordial leads record electrical activity in a more anteroposterior direction.
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Question 3 of 10
3. Question
Which of the following pairings among leads and parts of the heart that they represent is correct?
Hint
Hint: Chapter 2, 1:38. Leads I, II and III report electrical activity from the lateral and inferior parts the heart, whereas the precordial leads (V1-7) report electrical activity about the anterior, septal, and left lateral parts of the heart.
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Question 4 of 10
4. Question
You are trying to determine the heart rate looking at an ECG, using the estimation method. You notice that one of the R complexes is 25 small squares away from the previous R complex. What is the best estimate of the heart rate?
Hint
Hint: Chapter 4, 01:22. The estimation method gives you the following intervals for heart rate according to each “large square”: 300 – 150 – 100 – 75 – 60 – 50 – 43 – 37. Each large box contains 5 small squares.
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Question 5 of 10
5. Question
What defines a sinus rhythm?
Hint
Hint: Chapter 4, 02:44. A sinus rhythm indicates that the electrical activity originates in the SA node and travels in a progressive fashion through the AV node then to the Bundle of His and Purkinje fibers.
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Question 6 of 10
6. Question
A 2-month-old infant is found to have a right axis on ECG. Which of the following must be true?
Hint
Hint: Chapter 4, 03:32. Right axis is from +90 to +120 degrees. In this quadrant, Lead II can be either positive or negative. Lead I points towards 0 degrees, therefore a right axis would need to have a net negative in Lead I.
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Question 7 of 10
7. Question
A patient is noted to have a wide, notched P wave in lead II. Which of the following conditions could result in this ECG pattern?
Hint
Hint: Chapter 4, 05:34. The P wave is caused by the depolarization of the atria. A tall or wide P wave in Lead II can be indicative of atrial enlargement. The shape of the P wave (ie. notched) in Lead II can give you a clue as to which of the two atria are enlarged.
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Question 8 of 10
8. Question
A patient’s ECG shows a PR interval of 300ms and an occasional skipped QRS. What is this consistent with?
Hint
Hint: Chapter 4, 06:47. Second degree heart block is categorized by non-conducted P waves and dropped QRS complexes. Mobitz I and Mobitz II are differentiated by the pattern of dropped QRS beats. Mobitz I has a progressive prolonged PR interval, followed by a dropped QRS beat rather than an irregular patter of dropped QRS beats as in Mobitz II.
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Question 9 of 10
9. Question
The V1 lead of an ECG shows an RSR’ pattern with prolonged QRS complexes. Which diagnosis is this consistent with?
Hint
Hint: Chapter 4, 08:52. In a bundle branch block, the ventricles do not depolarize in a synchronized fashion.
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Question 10 of 10
10. Question
A 15 year old boy has an ECG that shows diffuse ST elevations in all of the leads. What is this consistent with?
Hint
Hint: Chapter 4, 11:18. Diffuse ST elevations in the pediatric population is indicative of inflammation.