In the diagram below A-D represent depolarization of ventricles. Which one represents “R” wave?
Correct Answer: C
Description: Ans. C. (C).a. P waveThe P wave is a small deflection wave that represents atrial depolarization.b. PR intervalThe PR interval is the time between the first deflection of the P wave and the first deflection of the QRS complex.c. QRS wave complexThe three waves of the QRS complex represent ventricular depolarization. For the inexperienced, one of the most confusing aspects of ECG reading is the labeling of these waves. The rule is: if the wave immediately after the P wave is an upward deflection, it is an R wave; if it is a downward deflection, it is a Q wave:i. small Q waves correspond to depolarization of the interventricular septum. Q waves can also relate to breathing and are generally small and thin. They can also signal an old myocardial infarction (in which case they are big and wide)ii. the R wave reflects depolarization of the main mass of the ventricles -hence it is the largest waveiii. the S wave signifies the final depolarization of the ventricles, at the base of the heartd. ST segmentThe ST segment, which is also known as the ST interval, is the time between the end of the QRS complex and the start of the T wave. It reflects the period of zero potential between ventricular depolarization and repolarization.e. T waveT waves represent ventricular repolarization (atrial repolarization is obscured by the large QRS complex).
Category:
Physiology
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