Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Three cases of dZ/dt (bottom) with the corresponding ECG signal (top) indicating variations in the morphology of dZ/dt signal with the characteristic points identified by the algorithm. Left panel: B and X points occur at a local minimum and global minimum, respectively; Middle panel: the B point is a notch; Right panel: the X point is just a local minimum and NOT a global minimum.
