In accordance with one aspect of the invention, {HEAD ~ a system} for tracking {TAIL ~ ectopic beats} comprises a signal sensing unit, a signal processor, and an output device 
In accordance with one aspect of the invention , { HEAD ~ a system } for tracking { TAIL ~ ectopic beats } comprises a signal sensing unit , a signal processor , and an output device
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH