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2014 ; 42
(6
): 1442-54
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Randomized ICU trials do not demonstrate an association between interventions
that reduce delirium duration and short-term mortality: a systematic review and
meta-analysis
#MMPMID24557420
Al-Qadheeb NS
; Balk EM
; Fraser GL
; Skrobik Y
; Riker RR
; Kress JP
; Whitehead S
; Devlin JW
Crit Care Med
2014[Jun]; 42
(6
): 1442-54
PMID24557420
show ga
OBJECTIVES: We reviewed randomized trials of adult ICU patients of interventions
hypothesized to reduce delirium burden to determine whether interventions that
are more effective at reducing delirium duration are associated with a reduction
in short-term mortality. DATA SOURCES: We searched CINHAHL, EMBASE, MEDLINE, and
the Cochrane databases from 2001 to 2012. STUDY SELECTION: Citations were
screened for randomized trials that enrolled critically ill adults, evaluated
delirium at least daily, compared a drug or nondrug intervention hypothesized to
reduce delirium burden with standard care (or control), and reported delirium
duration and/or short-term mortality (? 45 d). DATA EXTRACTION: In duplicate, we
abstracted trial characteristics and results and evaluated quality using the
Cochrane risk of bias tool. We performed random effects model meta-analyses and
meta-regressions. DATA SYNTHESIS: We included 17 trials enrolling 2,849 patients
which evaluated a pharmacologic intervention (n = 13) (dexmedetomidine [n = 6],
an antipsychotic [n = 4], rivastigmine [n = 2], and clonidine [n = 1]), a
multimodal intervention (n = 2) (spontaneous awakening [n = 2]), or a
nonpharmacologic intervention (n = 2) (early mobilization [n = 1] and increased
perfusion [n = 1]). Overall, average delirium duration was lower in the
intervention groups (difference = -0.64 d; 95% CI, -1.15 to -0.13; p = 0.01)
being reduced by more than or equal to 3 days in three studies, 0.1 to less than
3 days in six studies, 0 day in seven studies, and less than 0 day in one study.
Across interventions, for 13 studies where short-term mortality was reported,
short-term mortality was not reduced (risk ratio = 0.90; 95% CI, 0.76-1.06; p =
0.19). Across 13 studies that reported mortality, meta-regression revealed that
delirium duration was not associated with reduced short-term mortality (p =
0.11). CONCLUSIONS: A review of current evidence fails to support that ICU
interventions that reduce delirium duration reduce short-term mortality. Larger
controlled studies are needed to establish this relationship.