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.
Lorenz (Poincare) plot. The current NN interval (x axis) is plotted against the previous NN interval (y axis). In healthy subjects there is a notable disparity between the two NN intervals; at longer NN intervals lie low heart rates. This is not so in patients with heart failure. Reproduced with permission from Woo MA, et al. J Am Coll Cardiol 1994;23:565–9.
