Introduction
Normal QRS axis is -30 to +90.
If lead I & aVF are positive, then axis is normal.
If lead I is negative, then right axis deviation
If lead II is negative, then left axis deviation
| axis |
+110 |
+90 |
+60 |
+30 |
0 |
-30 |
-45
|
| lead I |
- |
= |
+ |
+ |
+ |
+ |
+
|
| lead II |
+ |
+ |
+ |
+ |
+ |
= |
-
|
| lead III |
+ |
+ |
+ |
= |
- |
- |
-
|
| + lead |
axis
|
| I |
-90 to +90
|
| II |
-30 to +150
|
| III |
+30 to -150
|
| aVF |
0 to +180
|
| aVL |
-120 to +60
|
| avR |
+120 to -60
|
| + lead |
axis
|
| I |
-90 to +90
|
| II |
-30 to +150
|
| III |
+30 to -150
|
| aVF |
0 to +180
|
| aVL |
-120 to +60
|
| avR |
+120 to -60
|
More general terms
Additional terms
References
- ↑ Current Pocket Reference 1997, Pharmacopoeia & Medical Notes, Shepherd/Whalen, Specialty Cards, Norman, OK
- ↑ Harrison's Principles of Internal Medicine, 14th ed. Fauci et al (eds), McGraw-Hill Inc. NY, 1998, pg 1240
- ↑ Practical ECG Interpretation, T Evans, Ring Mountain Press, 1998