Chapter 25 Photo-Plethysmography (PPG) Flashcards
1
Q
What does plethysmography measure
A
Volume changes
2
Q
This type of coupling the current flow in only 1 direction
A
DC
3
Q
DC coupling is used for what type of studies
A
Venous
4
Q
DC coupling detects _______ changes in blood content
A
Slower
5
Q
What type of coupling does the current flow in both directions
A
AC
6
Q
AC coupling detects ______ changes in blood content
A
Fast
7
Q
AC coupling is used for what type of studies
A
Arterial
8
Q
If the VRT is <______ seconds the study needs to be repeated
A
20
9
Q
WhF is a normal VRT without a tourniquet
A
> 20 seconds
