From Wikipedia, the free encyclopedia - View original article
If a Q wave is measured by ECG, the PR interval is also commonly termed the PQ interval.
Variations in the PR interval can be associated with certain medical conditions:
noco/cong/tumr, sysi/epon, injr
proc, drug (C1A/1B/1C/1D), blte
noco/syva/cong/lyvd/tumr, sysi/epon, injr
proc, drug (C2s+n/3/4/5/7/8/9)