10 Questions
Why is the T wave (representing ventricular repolarization) normally pointing in the same direction as the QRS complex representing ventricular depolarization?
Because repolarization starts in epicardial cells where the duration of action potential is shorter.
What is the significance of recording electrical activity between the electrodes in specific patterns in a 12-lead ECG?
To capture electrical signals from different angles for more accurate interpretation.
Which type of leads in a standard ECG involve limb electrodes as the positive and negative poles?
Bipolar leads.
Why does the T wave in an ECG represent ventricular repolarization?
Due to the shorter action potential duration in epicardial cells.
What causes the repolarization process to start in epicardial cells?
Shorter duration of action potential in epicardial cells.
What is the role of limb leads in a standard ECG?
To record electrical activity between limb electrodes.
How do unipolar leads differ from bipolar leads in a standard ECG?
Unipolar leads provide the reference pole using averaged limb electrodes.
In a 12-lead ECG, what do chest leads primarily help detect?
ST segment elevation myocardial infarction (STEMI).
What is the purpose of recording electrical activity between electrodes in specific patterns?
To capture signals from different angles for more precise interpretation
Why are bipolar leads considered important in standard ECG interpretation?
They assist in detecting ST segment deviations
Test your knowledge on the principles of electrocardiography and the pathophysiology of ECG as outlined in Alawi Alsheikh-Ali's slides for MEDC2441 lectures 13 and 14. Dive into understanding how ECG signals are generated from myocardial cells and interpreting standard ECG leads. Study guide recommended.
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