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1 Citation Mean QRS axis is also often called the mean electrical axis of the heart. A simple way to assess whether the mean QRS axis is normal or not is to look at leads I and aVf. If the average QRS deflection (difference between the amplitude of positive deflections and the negative deflections) is positive in both leads, the QRS axis is normal, i.e., between 0 degrees and +90 degrees. The electrical axis of lead I is 0 and that of aVf is +90 degrees. To get a better approximation of the QRS axis, the, technorati.com
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1 Citation W hat is the simplest and accurate way to predict the origin of Right atrial tacycardia(RAT) from left atrial tacycardia(LAT) ? Look at the P waves in V 1 ( Don?t look further ! ) A negative or a biphasic (+/- ) P wave in V 1 is 100% specific for a right atrial tachycardia A positive P in V1 or a biphasic ( ?/+ ) P-wave in lead V 1 has 100% sensitivity for a left atrial tachycardia What are the incidence of left and right atrial tachycardia ? RA- 75% LA -2, technorati.com
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