BOOKS OF RtfiDIfGS - PAHO/WHO

C... L MIX DEFINITION BY DRG
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- 64 -
M1EDICAL CAIE
sons. Moreover, each group can be revieweld
by PSRO personiiel anid a sit
selected for follow-up analyses. To tacili-.
tate further the identification of aberrant
utijization behavior, automnated screens
based on statistical algorithmns have also
been implemented that first flag those
DRGs with relatively high inter-losipital
v;riation, then determine for each hospital
the groups in which its mean length ofastav
was significantly higher than the area aidl(
those in which it was significantly lower.
4.4 A PSRO Monitoring Systecn
The utility of the DRGs in reviewing
PSRO data has suggested their potential
future application as a control mnechanismii
to replace the present costly concurrent review
process with a timely, cost-effective
retrospective monitoring systein. In this
context, at the ti mne of patient dlischarge, ani
abstract is produced l,and ia DRG nulnber
assigned based on data in the record. When
a small sample of records has accumulated
in a DRG for an institution or set of i nstitutions
under examinatiot., information froin
the sample can be used to estimate the
parameters ofthe distributions of 1 or morc
dependent variables related to utilization
or quality of care (e.g., length of stay, death
rate, postoperative wound intection rate).
Once acceptable patterns of practice have
Ibeen established, thie dionitoring systenm
can use standard statistical control procedures
to detect changes in the process.
iWhen: changes are detected, special
studies may be justifie, to determine the
cause for the change, which may be attributed
to errors in the record, 1 or more
particularly deviant cases, or an overall
change in the treatment process that has
affected all the cases. Work is currently
under way to develop computer-based systems
which could support such a control
mechanism in a timely manner on either a
hospital or PSRO level.
.