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.
This recording of microvascular perfusion in the right and left index fingers and forehead shows rapid global vasoconstriction in response to each series (Pain, T2–T5) of painful pulses of heat delivered to the right thenar eminence. (PPG = photoplethysmography, LDF = laser doppler flow).
