Poohbear,
Electrophysiology is still a relatively young field. Moreover, there is a huge shortage of electrophysiologists in the United States. These two
factorsFactor ix complex leadLead poisoning to differing practice methods. Hospital set their own standards for the number of nurses, ideas for patient "throughput", etc. I am not aware of universal standards, but a check of the www.jcaho.org website might provide you with more information.
The standards for clinical competence for your doctors in electrophysiology are listed at: http://www.acc.org/clinical/competence/invasive/index.htm.
Hope that helps.