I have not yet fully perused this site, but it may give some more info on DCM. http://www.ovcnet.uoguelph.ca/ClinStudies/Courses/Public/Cardiolo gy/Concepts/conceptsindex.htm Barb Bowes Bo & Chelsea (Pyrs), Flopsy (Pyr Shep) & Machin (Doxie) The more people I meet, the more I like my dog! bamb@monmouth.com