ECG QRS complex
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Introduction
ECG deflection resulting from depolarization of ventricles.
Clinical significance
Decreased amplitude (< 5 mm limb leads)
triphasic complex, rsR' (bifid QRS)
| QRS + in lead | QRS axis (degrees) |
|---|---|
| I | -90 to +90 |
| II | -30 to +150 |
| III | +30 to -150 |
| aVF | 0 to +180 |
| aVL | +60 to -120 |
| aVR | +120 to -60 |
thus lead II negative in left axis deviation &
lead I negative or small in right axis deviation
normal QRS axis: -30 to +100
More general terms
Additional terms
References
- ↑ Current Pocket Reference 1992 Pharmacopoeia & Medical Notes, Shepherd/Whalen, Specialty Cards, Norman OK 1997
- ↑ Harrison's Principles of Internal Medicine, 14th ed. Fauci et al (eds), McGraw-Hill Inc. NY, 1998
- ↑ Harrison's Principles of Internal Medicine, 13th ed. Isselbacher et al (eds), McGraw-Hill Inc. NY, 1994, pg 961