191
edits
No edit summary |
No edit summary |
||
Line 31: | Line 31: | ||
This indicates a normal heartaxis. Usually, these two leads are enough to diagnose a normal heartaxis! | This indicates a normal heartaxis. Usually, these two leads are enough to diagnose a normal heartaxis! | ||
The biggest vector in the heart is from the AV-node in the direction of the ventricular depolarization. | The biggest vector in the heart is from the AV-node in the direction of the ventricular depolarization. Under normal circulstances, this is directed left and down.(towards leads I and AVF). The position of the QRS vector is given in degrees. See the figure, the middle of the figure is the AV-node. A horizontal ine towards the left arm id defiuned as 0 degrees. | ||
A normal heartaxis is between -30 and +90 degrees. | |||
'''Rule:''' biggest QRS deflection in I and II is an intermediate = normal heartaxis. | |||
So positive deflections in I and II indicates a normal heartaxis. | |||
{{clr}} | {{clr}} | ||
==== | ====Interpretation==== | ||
De interpretatie van de elektrische hartas kent een aantal makkelijk te onthouden regeltjes: | De interpretatie van de elektrische hartas kent een aantal makkelijk te onthouden regeltjes: | ||