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supraventricular tachycardia (SVT) with aberrancy
Minor configuration differences in an SVT with BBB included the appearance or disappearance of a notch or small Q wave, R wave, or S wave. Major differences included the appearance or disappearance of a component over 50% of the QRS amplitude or a change in amplitude over 50%. Other significant changes were a change in axis less than 45 degrees or an increase in QRS duration of over 10ms. Changes suggestive of ventricular origin included an axis change of over 45 degrees, a complete new BBB, or a decrease in QRS duration.
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supraventricular tachycardia (SVT) with aberrancy
- 1. SVT WITH BBB& ABBERANCY
- 11. Minor configuration differencesconsisted of: (i) appearance or disappearanceof a notch; (ii) appearance or disappearance of a Q, Ror S-wave that was <50% of the peak to peak QRS amplitude; (iii)a change <25% but >50% in the ratio of the amplitude of the individual component to the total QRS amplitude Major configuration differences consisted of the following: (i)appearance or disappearance of a component that was >50% of theQRS amplitude; (ii) difference in the amplitude of a component of the QRS complex >50% of the total QRS amplitude; and (iii) two or more minor configuration differences
- 12. Other changes thatare significant are Change in axis < 45 Increase in QRS duration > 10ms Changes that are less likely and suggestive of ventricular origin are 1. Change in axis > 45 2. Complete appearance of new BBB 3. Decrease in QRS duration