Figure 1.
Tip of the duodenal photoplethysmographic probe. (1) An enteral feeding tube (2) with a balloon. (3) A photoplethysmographic sensor.
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.