View Full Version : P-R-T axes

06-30-2011, 01:12 PM
Does anyone know what the P-R-T axes means on an EKG?

My numbers keep changing and I cannot seem to find what "normal" is or even what this represents other than electrical activity.

Pam Alexson
06-30-2011, 05:03 PM
The axis on an ECG relates to the vector of the electrical signal. The vector is the direction the electrical impulse is travelling through the heart.

Normal range for the P wave vector is between 0 and +75 degrees, for the QRS between -30 and +105 and for the T wave between -30 and +90.

06-30-2011, 05:08 PM
Thanks Pam -

The electrical I knew but couldn't find the numbers.

My last EKG is 68 -27 123 so I guess it could be better -- oh well, that's HCM.

07-01-2011, 06:34 PM
Changes in axis can be due to the placement of the electrodes on the chest, so don't read too much into it. No one places those sticky little things in the exact same place each and every time. Severe axis deviation is not a good sign, but, to qualify for this diagnosis, you are probably already a patient in the ICU.