Patent ID: 9717836
Date: 2017-08-01
CPC Classifications: A61B,A61M

Claim:
1. A method of monitoring and adjusting volume status in a subject, said method comprising positioning a first photoplethysmography sensor on a central source site of said subject and positioning a second photoplethysmography sensor on a peripheral source site of said subject; obtaining a first area under the curve (AUC) and/or first amplitude of a pulsatile cardiac component (PCC) of a photoplethysmographic (PPG) signal from said first photoplethysmography sensor on said central source site; obtaining a second area under the curve (AUC) and/or second amplitude of a pulsatile cardiac component (PCC) of a photoplethysmographic (PPG) signal from said second photoplethysmography sensor on said peripheral source site; and comparing said first AUC and/or amplitude and said second AUC and/or amplitude; wherein if said second AUC and/or amplitude decreases relative to said first AUC and/or amplitude, fluids are administered to the subject or fluid removal is decreased, and if said second AUC and/or amplitude increases relative to said first AUC and/or amplitude, fluid removal is increased or fluid administration to the subject is decreased.