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Questions and Answers
Which statement accurately describes the effect of ischemia on the heart's electrical activity?
Which statement accurately describes the effect of ischemia on the heart's electrical activity?
What is observed in the st segment during myocardial injury?
What is observed in the st segment during myocardial injury?
Which lead primarily monitors the electrical activity of the anterior heart wall?
Which lead primarily monitors the electrical activity of the anterior heart wall?
In myocardial infarction, what is a key characteristic noted on the ECG?
In myocardial infarction, what is a key characteristic noted on the ECG?
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How does the heart muscle behave during total loss of electrical activity?
How does the heart muscle behave during total loss of electrical activity?
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Which leads provides a view of the left lateral wall of the heart?
Which leads provides a view of the left lateral wall of the heart?
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What indicates that a myocardial infarcted tissue is nonviable?
What indicates that a myocardial infarcted tissue is nonviable?
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Which leads are most relevant when assessing the inferior aspect of the heart?
Which leads are most relevant when assessing the inferior aspect of the heart?
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Study Notes
Depolarization and Repolarization
- Depolarization is not ATP driven, it is voltage gated
- Repolarization is affected by the flow of blood to the head
- Less blood flow to the head means less repolarization
ST Segment
- The ST segment is the most explored part of repolarization
- Ischemia affects repolarization
- Injury affects repolarization
- Infarction affects repolarization
EKG Readings
- Tissue with no depolarization is dead
- Tissue that does not depolarize at all is infarcted
- A big dip in the ST segment indicates a myocardial infarction (MI)
EKG Leads and Locations
- Left leg up, 2,3, aVF leads focus on the left lateral wall
- Leads I and aVL look at the left lateral wall
- Lead1, aVF, and V6 allow for a view of the whole lateral wall
- Lead V6 can also show the apical view of the heart
- Leads V3 and V4 show the anterior heart wall
- Leads V1 and V2 show the inferior aspect of the heart
- Leads V1 and V2 can also show the septal wall and sternal border
- Leads V1 and V2 look at the septum of the heart from a sternal view
- Lead 1, aVL, and I look at the left, lateral, and inferior wall of the heart
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Description
Test your knowledge on depolarization, repolarization, and EKG interpretations. This quiz covers important concepts such as ST segment analysis, myocardium health indicators, and lead placements for heart assessments. Enhance your understanding of how blood flow affects heart activity.
