Bl. Senst et al., Practical approach to determining costs and frequency of adverse drug events in a health care network, AM J HEAL S, 58(12), 2001, pp. 1126-1132
The frequency, preventability, severity, root causes, and projected costs o
f adverse drug events (ADEs) occurring after or causing admission to a four
-hospital integrated academic health network were studied.
The sample included all admissions during a 53-day study period. Events wer
e identified through daily record review of a random patient sample, comput
erized flags, and self-reporting. A case review committee validated the occ
urrence, classification, and root causes of the events. Additional length o
f stay and costs associated with ADEs were analyzed by using a case-control
, multiple linear regression model.
The estimated ADE rate during hospitalization was 4.2 events per 100 admiss
ions, with a cost of $2162 per ADE. In addition, 3.2% of admissions were ca
used by ADEs, with an associated cost of $6685 per event. Fifteen percent o
f hospital ADEs and 76% of ADEs causing admission were judged preventable.
The annual cost to the organization for events occurring during hospitaliza
tion was $1.7 million, and the cost of preventable ADEs was $260,000, while
the projected costs of preventable ADEs causing admission were $3.8 millio
n. The rate of admissions to the mental health center caused by ADEs was hi
gher than for other settings at 13.6%, with a cost of preventable ADEs of $
1.3 million. Patient noncompliance was judged to be the cause of the 69% of
the ADEs causing admission. Seventy-one percent of the serious medication
errors occurred at the prescribing stage of the medication-use process.
ADEs were frequent, costly, and often preventable and resulted in many admi
ssions to a mental health center.