Otterbein/Grant CRNA ECG I Lecture Brief Review
Short and sweet (hopefully)
Questions and Answers
- 1.
As the QRS complex progresses from V1-V6, S wave amplitude _________ and R wave amplitude ___________.
- A.
Decreases, increases
- B.
Increases, decreases
- C.
Decreases, decreases
- D.
Increases, increases
Correct Answer
A. Decreases, increasesExplanation
Poor R wave progression noted in: LVH, RVH, anterior MI, emphysema, L BBB, misplaced leadsRate this question:
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- 2.
Diagnosing LVH consists of adding the amplitude of the S wave in V1 with the ___ wave in V5, if the sum is >35, as well as ST depression and T wave inversion in V5 and V6.
Correct Answer
RExplanation
The correct answer is R. In diagnosing LVH, the amplitude of the S wave in V1 is added to the R wave in V5. If the sum is greater than 35, along with ST depression and T wave inversion in V5 and V6, it suggests the presence of left ventricular hypertrophy.Rate this question:
- 3.
A tall R wave in V1 that progessively decreases through V4 is indicative of _____ ventricular hyptertrophy.
Correct Answer
RightExplanation
A tall R wave in V1 that progressively decreases through V4 is indicative of right ventricular hypertrophy. This pattern is commonly seen in conditions such as pulmonary hypertension or chronic lung disease, where the right ventricle becomes enlarged and the electrical activity changes in the corresponding leads.Rate this question:
- 4.
Limb leads determine the axis of the frontal plane while precordial leads determine the axis of the _________ plane in the mediolateral direction.
Correct Answer
HorizontalExplanation
Limb leads determine the axis of the frontal plane, which is the plane that divides the body into front and back halves. On the other hand, precordial leads determine the axis of the horizontal plane in the mediolateral direction. The horizontal plane divides the body into upper and lower halves. Therefore, the correct answer is "Horizontal."Rate this question:
- 5.
Myocardial ischemia and inflammation frequently cause peaked T waves.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Primary T wave inversionRate this question:
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- 6.
Delta waves occur in several pre-excitation syndromes and produce a characteristic hump or slurring at the beginning of the ____.
Correct Answer
QRSExplanation
Delta waves are abnormal electrical waves that occur in the heart during certain pre-excitation syndromes, such as Wolff-Parkinson-White syndrome. These waves cause a characteristic hump or slurring at the beginning of the QRS complex on an electrocardiogram (ECG). The QRS complex represents the depolarization of the ventricles, so the presence of delta waves at the beginning of the QRS complex indicates an abnormal electrical pathway in the heart, which can lead to arrhythmias and other cardiac complications.Rate this question:
- 7.
The ___ interval is used to measure AV node conduction.
Correct Answer
PRExplanation
The PR interval is used to measure AV node conduction. The PR interval represents the time it takes for the electrical signal to travel from the atria to the ventricles through the AV node. It is measured on an electrocardiogram (ECG) and is an important parameter in assessing the conduction system of the heart. A prolonged PR interval may indicate a delay in AV node conduction, while a shortened PR interval may suggest an accelerated conduction through the AV node.Rate this question:
- 8.
The ___ interval represents the entire time of systole.
Correct Answer
QTExplanation
Normal is 0.44 +/- 0.02 secondsRate this question:
- 9.
Which of the following are not part of the hexaxial lead system?
- A.
Bipolar limb leads
- B.
Augmented limb leads
- C.
Precordial leads
Correct Answer
C. Precordial leadsExplanation
The hexaxial lead system consists of six leads that are used to measure the electrical activity of the heart from different angles. The bipolar limb leads and augmented limb leads are both part of the hexaxial lead system. However, the precordial leads, also known as chest leads, are not part of the hexaxial lead system. Precordial leads are placed on the chest to provide a different perspective of the heart's electrical activity.Rate this question:
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