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2017 ; 18
(3
): 373-381
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Randomized Trial of Adding Parenteral Acetaminophen to Prochlorperazine and
Diphenhydramine to Treat Headache in the Emergency Department
#MMPMID28435487
Meyering SH
; Stringer RW
; Hysell MK
West J Emerg Med
2017[Apr]; 18
(3
): 373-381
PMID28435487
show ga
INTRODUCTION: Headaches represent over three million emergency department (ED)
visits per year, comprising 2.4% of all ED visits. There are many proposed
methods and clinical guidelines of treating acute headache presentations.
However, data on intravenous acetaminophen usage in these settings are lacking.
In this study, we sought to determine the efficacy of intravenous (IV)
acetaminophen as an adjunct to a standard therapy for the treatment of patients
who present to the ED with a chief complaint of "headache." METHODS: We conducted
a single site, randomized, double-blind, placebo-controlled trial investigating
the clinical efficacy of IV acetaminophen as an adjunct to a standard therapy
with prochlorperazine and diphenhydramine for the treatment of patients who
present to the ED with a chief complaint of "headache" or variants thereof. (See
below for variants). The primary outcome measure of the efficacy of parenteral
acetaminophen as an adjunct treatment for headache in addition to a standard
therapy was a threshold two-point reduction in visual analog scale (VAS) pain
scores on a 1-10 level at 90 minutes. Secondary outcomes measures included
assessment of decreased requirement of "rescue" pain medicines, defined as any
analgesic medications outside of diphenhydramine, prochlorperazine and
acetaminophen, with particular interest to potential opioid-sparing effects with
parenteral acetaminophen. Additional secondary outcome measure included time to
disposition from arrival in the ED. RESULTS: For the acetaminophen group the
initial mean pain score was 8.67, for the placebo group 8.61. At 90 minutes pain
score was 2.23 for the acetaminophen group and 3.99 for placebo (p<0.01, 95%
confidence interval (CI) [0.8%-16%]. Of 45 patients in each group, we observed at
least a threshold two-point decrease in pain score 36/45 (80%) with acetaminophen
vs. 25/45 (55%) with placebo (p <0.01) 95% CI [5%-41%], number needed to treat
(NNT) = 4). Secondary outcome measure did not demonstrate a difference in length
of stay (161 minutes for acetaminophen arm and 159 minutes for placebo). However,
17/45 (38%) of patients who received IV acetaminophen required rescue analgesia,
opposed to 24/45 (53%) of patients in the placebo group (p=0.13) 95% CI
[-5%-34%]. CONCLUSION: IV acetaminophen when used with prochlorperazine and
diphenhydramine to treat acute headaches in the ED resulted in statistically
significant pain reduction compared with prochlorperazine and diphenhydramine
alone as measured by both threshold of lowering VAS pain score by at least two
points (NNT = 4) and overall decline in VAS pain score. Further study is required
to validate these results.
|*Emergency Service, Hospital
[MESH]
|Acetaminophen/administration & dosage/*therapeutic use
[MESH]
|Administration, Intravenous
[MESH]
|Adult
[MESH]
|Analgesics/administration & dosage/*therapeutic use
[MESH]
|Diphenhydramine/administration & dosage/*therapeutic use
[MESH]
|Double-Blind Method
[MESH]
|Drug Therapy, Combination
[MESH]
|Female
[MESH]
|Headache/*drug therapy/physiopathology
[MESH]
|Humans
[MESH]
|Length of Stay/statistics & numerical data
[MESH]
|Male
[MESH]
|Middle Aged
[MESH]
|Pain Measurement/drug effects
[MESH]
|Prochlorperazine/administration & dosage/*therapeutic use
[MESH]