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.
Example signals of one cardiac cycle with corresponding fiducials: P, Q, R, S and T waves’ peaks for electrocardiogram (ECG) (blue); and foot, upstroke, shoulder, peak, dicrotic notch (DN), and secondary peak (SP) for photoplethysmogram (PPG) (red).
