Otterbein/Grant CRNA ECG III Quick Review
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Questions and Answers
- 1.
Myocardial ischemia occurs when there is a relative lack of O2 supply to the myocardium and metabolite removal from the heart for a given O2 consumption; it is classically noted as symmetrical __ wave changes.
Explanation
Myocardial ischemia occurs when there is a relative lack of oxygen supply to the myocardium and metabolite removal from the heart for a given oxygen consumption. It is classically noted as symmetrical T wave changes.Rate this question:
- 2.
ECG changes are an early indicator of myocardial ischemia.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Ischemia cascade:
Shift to anaerobic metabolism
Diastolic dysfxn
Systolic dysfxn
Hemodynamic changes (dec. CO)
ECG changes
AnginaRate this question:
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- 3.
The majority of ischemia occurs intraoperatively.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
80% occurs post-operativelyRate this question:
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- 4.
When examining an EKG for a suspected posterior MI, you would look for ST ______ in leads V1 and V2.
- A.
Elevation
- B.
Depression
Correct Answer
B. DepressionExplanation
When examining an EKG for a suspected posterior MI, you would look for ST depression in leads V1 and V2. This is because ST depression in these leads is indicative of ischemia or injury in the posterior wall of the heart. It suggests that the blood supply to the posterior region of the heart is compromised, possibly due to a myocardial infarction. Therefore, the presence of ST depression in leads V1 and V2 can help confirm the diagnosis of a posterior MI.Rate this question:
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- 5.
When identifying ischemia in the absence of LVH or LBBB, new ST elevation, or ST depression with T-wave changes must be identified in how many contiguous leads?
Correct Answer
2, twoExplanation
In order to identify ischemia in the absence of LVH or LBBB, new ST elevation or ST depression with T-wave changes must be identified in two contiguous leads. This means that the ST segment must be elevated or depressed in two leads that are next to each other on an ECG. This finding is important in diagnosing ischemia, as it indicates a lack of blood flow to a specific area of the heart.Rate this question:
- 6.
An infarction of which of the following areas would most likely have the greatest effect on SA/AV node conduction?
- A.
Inferior
- B.
Anterior
- C.
Posterior
- D.
Anterolateral
Correct Answer
A. InferiorExplanation
Due to RCA involvement - RCA supplies SA node in 80% of populationRate this question:
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- 7.
L BBB and LVH make the diagnosis of MI impossible (or rather difficult).
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
I'm not sure if it's just anterior and posterior or if it's all MI's...just remember to check for LVH and LBBB!Rate this question:
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