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.
Pulse transit time (PTT) calculation. The figure shows application of Matlab-based second derivative algorithm using the foot-to-foot method. (A) Carotid pressure signal (top) with its second derivative (bottom), (B) femoral pressure signal (top) with its second derivative (bottom), and (C) digital pressure signal (top) with its second derivative (bottom).
