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Questions and Answers
Which factor does NOT directly affect repolarization?
What happens to tissue that experiences an infarct?
Which leads provide an anterior view of the heart wall?
Which lead is considered to give a view of the left lateral wall of the heart?
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What does ST segment elevation typically indicate in terms of heart condition?
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What leads look from the left arm for assessing the left lateral wall of the heart?
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Which of the following leads primarily examines the inferior aspect of the heart?
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What indicates that some electrical activity is still present from the apex of the heart?
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What is the role of voltage-gated channels during depolarization?
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Which leads are primarily used to visualize the septal wall of the heart?
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Study Notes
Depolarization
- Depolarization is not ATP driven
- It is voltage-gated
- Depolarization affects repolarization
The ST Segment
- The ST segment is most affected by repolarization
- The ST segment is explored to see the effects of repolarization
Ischemia
- Decreased blood flow to the head means less blood flow to the heart
- Ischemia affects repolarization
- Cells are still alive in ischemia
Injury
- Injury affects repolarization
- The ST segment is elevated in injury
- The Q wave is blocked in injury
Infarct
- Tissue does not depolarize at all in an infarct
- Infarct means that the tissue is dead
- There is no repolarization is an infarct
MI
- A big dip in the ST segment represents an MI
ECG Leads
- 2,3 and auf leads focus on the left leg and the posterior wall
- Lead 1 and AVF look from the left arm
- Lead 1, aVL, and V6 looks at the left lateral wall of the heart
- V3 and V4 look at the anterior heart wall
- V1 and V2 look at the inferior aspect of the heart and the septum
- V1 and V2 also view from the sternal borderÂ
- V1 and V2 also look at the septum
- Leads V3, V4, and V6 look at the lateral aspect of the heart
- V5 and V6 look at the lateral aspect of the heart and the apex
- Left atrial leads aVL, lead 1, and lead 111 look at the septal wall
- aVL and lead 1 look at the lateral leads
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Description
This quiz covers key concepts related to cardiac physiology, including depolarization, the ST segment, and the effects of ischemia and infarction on heart function. It explores how these elements interact during various cardiac events and the implications for ECG interpretation. Test your knowledge on these crucial aspects of cardiac health!
