QRS Complex
- Filed under: Uncategorized
- Date: May 24,2008
QRS complex represents the depolarisation of the ventricles. Initial negative deflection is named as the Q wave and a negative deflection after a positive deflection the S wave. First positive deflection is called R wave. If the first deflection is positive, the ensuing negative deflection is called S wave and not Q wave. If there are two positive deflections, then the second one is named R’ (read as R prime). Duration of the QRS complex in an adult is upto 110 mSec. If it is more than that, it is called as a wide QRS.
Waves of low amplitude are denoted by lower case letters and larger amplitude waves by upper case letters. e.g. rSr’ means a small r wave followed by a deep S wave and a secondary r’ wave. If there is only a single deep negative deflection, it is also called a QS complex.
Related Articles:
- U wave
- 12 Lead ECG
- Segments and Intervals in an Electrocardiogram (ECG)
- Waves in an Electrocardiogram
Related Pages
- U wave
- Waves in an Electrocardiogram
- Left Bundle Branch Block (LBBB)
- Segments and Intervals in an Electrocardiogram (ECG)
- 12 Lead ECG
