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M9610662.TXT
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1996-01-30
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Document 0662
DOCN M9610662
TI Evaluating the quality of life associated with rifabutin prophylaxis for
Mycobacterium avium complex in persons with AIDS: combining Q-TWiST and
multiattribute utility techniques.
DT 9601
AU Revicki DA; Simpson KN; Wu AW; LaVallee RL; Medical Technology
Assessment and Policy Research Program,; Battelle Centers for Public
Health Research and Evaluation,; Arlington, VA 22201, USA.
SO Qual Life Res. 1995 Aug;4(4):309-18. Unique Identifier : AIDSLINE
MED/96045252
AB Our objective was to evaluate the effect of rifabutin prophylaxis in
patients with AIDS and CD4 counts of less than 200 per cubic millimetre
using a combination of Q-TWiST (quality-adjusted time without symptoms
and toxicity) and multiattribute health utility assessment. The design
consisted of a secondary analysis of two previously reported
multicentre, randomized, placebo-controlled clinical trials conducted in
78 academic, community and Department of Veterans Affairs HIV centres
and private practices. 542 patients with AIDS and CD4 counts of less
than 200 per cubic millimetre were assigned to rifabutin 300 mg/day and
562 were assigned to a placebo. A modified Q-TWiST approach was used for
comparing treatments based on the occurrence and duration of time with
and without severe symptoms and clinical endpoints. Health states were
constructed to represent combinations of clinical events experienced by
study patients. Five physicians assigned utilities for health states
using a six-attribute health classification system. These utilities were
used to adjust survival for QOL. The rifabutin and placebo groups were
compared using estimated quality-of-life-adjusted days. The incidence of
MAC was 9% for the rifabutin group and 18% for the placebo group (p <
0.001). Differences, although not statistically significant, were
observed for rates of survival and hospitalization. The rifabutin group
experienced less anaemia (p < 0.02), and fever and night sweats (p <
0.02) than the placebo group. Average Q-TWiST days were 325 for the
rifabutin group and 309 for the placebo group (p < 0.05). Q-TWiST days
were significantly lower for patients with MAC bacteraemia (p < 0.04)
and hospitalizations (p < (0.003). Rifabutin prophylaxis resulted in
fewer MAC infections and greater quality-of-life-adjusted days of
survival compared to no rifabutin. Quality-of-life-adjusted survival,
based on a combination of the Q-TWiST and multiattribute health utility
index, is a feasible approach for evaluating the outcomes of medical
treatment. Future studies should, however, use patient-assigned utility
weights to compute Q-TWiST scores, since physician generated utilities
may differ significantly from those of patients.
DE Analysis of Variance Antibiotic Prophylaxis Antibiotics,
Antitubercular/*THERAPEUTIC USE AIDS-Related Opportunistic
Infections/MORTALITY/*PREVENTION & CONTROL Clinical Trials/STATISTICS
& NUMER DATA Human Mycobacterium avium-intracellulare
Infection/MORTALITY/ *PREVENTION & CONTROL *Quality-Adjusted Life
Years Rifabutin/*THERAPEUTIC USE *Severity of Illness Index Support,
Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).