Question
What does this wave(as marked by an arrow in the image) indicates?
A. Atrial Repolarization.
B. Atrial Depolarization.
C. Ventricular Depolarization.
D. Ventricular Repolarization.
Show Answer
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Correct Answer » B
Explanation
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Ans: . Atrial Depolarization
This is an ECG wave pointing towards P wave.
Electrocardiogram
- It is a representation of the heart’s electrical activity recorded from electrodes on the body surface.
ECG Waves and Intervals:
- P wave: the sequential activation (depolarization) of the right and left atria
- QRS complex: right and left ventricular depolarization (normally the ventricles are activated simultaneously)
- ST-T wave: ventricular repolarization
- U wave: origin for this wave is not clear – but probably represents “afterdepolarizations” in the ventricles
- PR interval: time interval from onset of atrial depolarization (P wave) to onset of ventricular depolarization (QRS complex)
- QRS duration: duration of ventricular muscle depolarization
- QT interval: duration of ventricular depolarization and repolarization
- RR interval: duration of ventricular cardiac cycle (an indicator of ventricular rate)
- PP interval: duration of atrial cycle (an indicator of atrial rate)
