<prompt> Answer this question truthfullyCould you provide me with the original text, please? So I can paraphrase it accordingly.  <response>: <reason> The P wave axis is -60 to -80 degrees normal is 0 to 75 degrees The P wave of the junctional beat may Precede the QRS in an upper nodal rhythm Superimpose on the QRS in a middle nodal rhythm Follow the QRS in a lower nodal rhythm This depends not only on the location of the pacemaker upper, middle, or lower but also on the retrograde conduction of the impulse. There could be a pacemaker located in the upper portion of the node, but if retrograde conduction was slow, then the P wave would not precede the QRS Thus these terms pertaining to the nodal location may be misleading and are no longer used. Typically the PR interval is .11 second, the RP interval may be up to.20 seconds The morphology of the QRS is not altered. 