Liver injury is a complication of sepsis and septic liver injury has adverse impact upon the
outcome. As a measurement for liver function, Plasma clearance rate of indocyanine green
(PDR-ICG) always decreased during the early phase of sepsis. So the investigators hypotheses
include: PDR-ICG is lower in sepsis patients than non-septic patients in ICU; PDR-ICG may be
lower in abdominal sepsis patients than non-abdominal sepsis patients in ICU; PDR-ICG
correlates with abdominal perfusion pressure; change of PDR-ICG in early phase correlates
with change of transaminase or bilirubin in late phase of sepsis.