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.
APD as a function of the distance along the diagonal x = y for beats 45 (gray) and 46 (black) of the simulations presented in Fig. 4. The two traces cross in deterministic pacing (solid lines), further illustrating the existence of discordant alternans. In contrast, the traces corresponding to stochastic pacing (dotted lines) are parallel, and concordant alternans do not transform into discordant ones.
