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Principles of Electrocardiography in Cardiovascular System MEDC2441

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Principles of Electrocardiography in Cardiovascular System MEDC2441

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Questions and Answers

Why is the T wave (representing ventricular repolarization) normally pointing in the same direction as the QRS complex representing ventricular depolarization?

Due to the hyperkalemia present during ventricular repolarization.

Because repolarization is directed from endocardium to epicardium.

Because depolarization is directed from epicardium to endocardium.

Because repolarization starts in epicardial cells where the duration of action potential is shorter. (correct)

What is the significance of recording electrical activity between the electrodes in specific patterns in a 12-lead ECG?

To identify hyperkalemia in the heart.

To capture electrical signals from different angles for more accurate interpretation. (correct)

To detect left and right axis deviations.

To monitor ventricular depolarization.

Which type of leads in a standard ECG involve limb electrodes as the positive and negative poles?

Chest leads.

Unipolar leads.

Intracardiac leads.

Bipolar leads. (correct)

Why does the T wave in an ECG represent ventricular repolarization?

Due to the shorter action potential duration in epicardial cells. Signup and view all the answers

What causes the repolarization process to start in epicardial cells?

Shorter duration of action potential in epicardial cells. Signup and view all the answers

What is the role of limb leads in a standard ECG?

To record electrical activity between limb electrodes. Signup and view all the answers

How do unipolar leads differ from bipolar leads in a standard ECG?

Unipolar leads provide the reference pole using averaged limb electrodes. Signup and view all the answers

In a 12-lead ECG, what do chest leads primarily help detect?

ST segment elevation myocardial infarction (STEMI). Signup and view all the answers

What is the purpose of recording electrical activity between electrodes in specific patterns?

To capture signals from different angles for more precise interpretation Signup and view all the answers

Why are bipolar leads considered important in standard ECG interpretation?

They assist in detecting ST segment deviations Signup and view all the answers