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Acta Anaesthesiol Scand 2002; 46: 238–244
Copyright C Acta Anaesthesiol Scand 2002 Printed in Denmark. All rights reserved ACTA ANAESTHESIOLOGICA SCANDINAVICA
Dimenhydrinate for prophylaxis of postoperative
nausea and vomiting: a meta-analysis of randomized
controlled trials

P. KRANKE1, A. M. MORIN2, N. ROEWER1 and L. H. J. EBERHART21Department of Anesthesiology, University of Wuerzburg and 2Department of Anesthesiology, University of Marburg, Germany Background: Diphenhydramine and its theoclate salt dimenhy-
1658 patients received a placebo (control) and 1387 patients re- drinate are traditional antiemetics still in use. However, so far the quantitative effect of dimenhydrinate in the prophylaxis of Results: The RB to stay completely free of PONV was 1.2 (95%
postoperative nausea and vomiting (PONV) has not been evalu- CI: 1.1–1.4) for the early period (NNT Ω 8; 95% CI: 5–25) and 1.5 (1.3–1.8) for the overall investigated period (NNT Ω 5; 95% CI: Methods: Results from randomized controlled trials investigat-
ing the efficacy of dimenhydrinate vs. a control to prevent Conclusion: Dimenhydrinate is a traditional and inexpensive
PONV were included in a meta-analysis. Studies were system- antiemetic with an efficacy that might be considered as clinically atically searched through MEDLINE, EMBASE, the Cochrane- relevant. Although in use for a long time, the dose–response, Library, manually screening of reference lists of matching review precise estimation of side-effects, optimal time of administration articles and current issues of locally available peer-reviewed and the benefit of repetitive doses still remain unclear.
anesthesia journals, up to June 2001. The numbers of patientswith complete absence of PONV within 6 h and within 48 h after Received 2 July, accepted for publication 12 October 2001 surgery were extracted as the main end point. Pooled relativebenefits (RB) and numbers-needed-to-treat (NNT) with their Key words: antiemetics; antihistamines; dimenhydrinate; di-
corresponding 95% confidence intervals (CI) were calculated phenhydramine; meta-analysis; postoperative complications, using a random effects model. This quantitative systematic re- postoperative nausea and vomiting (PONV); quantitative sys- view was performed following the recommendations of the QUORUM statement.
In all, 18 trials with 3045 patients were included in the analysis: c Acta Anaesthesiologica Scandinavica 46 (2002) CURRENT trials published in anesthesia journals Methods
indicate that postoperative nausea and vomit- ing (PONV) is still considered a relevant and un- The main procedure for this analysis was laid down solved complication (1–6). A survey reporting per- prospectively before the data extraction was started sonal attitudes of anesthesiologists on PONV has and was performed according to the QUORUM state- shown that dimenhydrinate, a salt of diphenhydra- ment suggesting uniform requirements for con- mine, is judged to have a comparable effectiveness to metoclopramide. Of the questioned anesthesiolo- Principles of systematic search and inclusion cri- gists, 71.2% (n Ω 324) stated that dimenhydrinate is teria, data extraction, study end points, critical ap- an effective or very effective antiemetic (7). While praisal and statistics have been described in previous for metoclopramide it has been shown that its reports and were applied as previously published prophylactic antiemetic properties are of limited value in the clinical setting (8), such an analysis islacking for dimenhydrinate.
Systematic search and inclusion criteria In this systematic review a meta-analysis was per- A systematic search of the literature was performed formed of randomized controlled trials comparing the for full reports of randomized, controlled clinical tri- relative efficacy of dimenhydrinate with an inactive als that tested the effect of prophylactic dimenhydrin- ate or diphenhydramine (from now on denoted ‘di- Dimenhydrinate for prophylaxis of PONV
menhydrinate’) compared to an inactive control. TheCochrane Library, MEDLINE and EMBASE weresearched without language restriction. Free textsearch terms included ‘dimenhydrinate’ or ‘diphenhy-dramine’ or ‘dramamine’ and ‘nausea’ or ‘vomiting’or ‘emesis’. The last electronic search update was per-formed in June 2001. The reference lists of retrievedreports, review articles and locally available anes-thesia journals were checked to find additional re-ports.
Data extractionTwo of the authors (P.K and L.E) extracted the follow-ing data from each study independently from eachother: absence of postoperative nausea (PN), post-operative vomiting (PV) and PONV and other rel- Fig. 1. Prevention of postoperative nausea and vomiting with dimenhy-
evant features. If the extracted data were conflicting drinate. Flow chart of retrieved, excluded and eventually analyzed re-ports. they were checked and in the case of further disagree-ment, consensus was reached with a third author(A.M).
The main end point was the number of patients that Forty-two potentially relevant reports were identified stayed completely free from PONV. This was defined and initially screened (Fig. 1). Of these, 38 were clin- as absence of any nausea, retching or vomiting. All ical trials in which data on PONV could be obtained.
other patients were defined as having PONV. Second- A total of 20 trials had to be excluded subsequently ary end points were the absence of PN, PV and side- due to lack of or inappropriate randomization. Thus, effects. Since some studies used different observation 18 reports with 3045 patients remained for final analy- periods postoperatively, absence of symptoms was ex- sis: 1658 patients in the control group and 1387 pa- tracted for two separate intervals: the first 6 h post- tients who received dimenhydrinate. The median Ox- operatively (‘early’) and the first 48 h postoperatively ford-Score of the analyzed trials was 4 (range: 1 (only randomization reported) to 5 (full report of featuresdescribed in the Oxford scale)). Two reports were scored ‘1’, three reports scored ‘2’, two reports scored Quality of reporting in the trials was scored using the ‘3’, six reports scored ‘4’ and five reports scored ‘5’.
three-item, five-point Oxford scale (13). Thus, the The median number of patients per trial receiving pla- minimum score of an included trial according to the cebo and dimenhydrinate was 46 (range: 20–420) and above-mentioned inclusion criteria (randomized tri- als) was 1 and the maximum score could be 5.
StatisticsData entry and statistical calculations were performed Early events (0–6 h postoperatively) using the computer program RevMan 4.1 (14). A ran- Data on the incidence of the investigated outcome domeffects model was applied to calculate the relative during the early postoperative period was available benefit (RB) with 95% confidence intervals (CI) (15).
for PONV in eight trials with 884 control patients and A RB Ͼ 1 means that an intervention is associated with an increased likelihood to stay completely free from could be extracted in 6 trials with 429 patients in the PONV. The difference between two groups was control group and 355 patients receiving dimenhyd- judged statistically significant when the 95% CI of the rinate (16, 17, 19, 21). Data on PN were reported in RB did not include the value 1.00. As an estimate of two trials with 53 and 54 patients in the active and the clinical relevance of any difference between active placebo group, respectively (22, 23).
and control, we calculated the number-needed-to- Dimenhydrinate was associated with a higher inci- dence of patients without emetic symptoms in this P. Kranke et al.
period. While this benefit failed to reach statistical sig- menhydrinate (16, 17, 19, 20, 24, 26–33). Data on PN nificance for PN (only two trials were available for were reported in seven trials with 741 control and 445 pooled analysis), it was significant for PV and the actively treated patients for this period (16, 20, 24, 27– main outcome PONV (Table 1). For the combined data 29, 33). Table 3 summarizes the pooled results.
the RB for PONV was 1.21 (95% CI: 1.07–1.35). TheNNT with an average control event rate (CER) of 54%was in the range of 8 (95% CI: 5–25).
Side-effectsReporting of side-effects was inconsistent and sparse.
In many of the studies it was stated that side-effects Overall events (0–48 h postoperatively) did not differ between the groups but no binary data Data were more consistently reported and available were given. No major harm associated with the use for PONV in 16 trials with 1604 control patients and of dimenhydrinate was reported. Due to the sparse 1334 actively treated patients (16–21, 24–33) (Table 2).
reporting it was felt inappropriate to calculate a PV could be extracted in 14 trials with 1118 patients pooled effect since information would not exceed that in the control group and 800 patients receiving di- Results of studies investigating the relative efficacy of dimenhydrinate vs. placebo for the early period (0–6 h). The given benefit represents thelikelihood of being free from PONV (main outcome) for patients receiving dimenhydrinate. All studies are listed according to their relative benefit Table 2. Results of studies investigating the relative efficacy of dimenhydrinate vs. placebo for the overall period (0–48 h). The given benefitrepresents the likelihood of being free from PONV (main outcome) for patients receiving dimenhydrinate. All studies are listed according to theirrelative benefit Dimenhydrinate for prophylaxis of PONV
Pooled results used a variety of application modes We separately analyzed the subgroup of children. Ex- (single vs. repetitive doses), routes of application (i.m.
cept for one study (30) in which a second intravenous vs. i.v. vs. rectal) and patients (children vs. adults).
dose was administered postoperatively, dimenhydrin- Therefore, overall results were tested with respect to ate was applied only once in children. A single i.v.
robustness by excluding certain subgroups and thus application was as effective as a single rectal appli- narrowing the interstudy variety. Since most data cation of a dose about twice as high than those used were available on ‘late PONV’, this was done solely for the i.v. application (Table 4). This is in agreement with the recommendations of the manufacturer of di-menhydrinate.
AdultsIn adults we separately analyzed studies in which asingle dose was applied and compared the results to Discussion
those obtained by trials in which the first dose wasadministered in conjunction with anesthesia and di- The main finding of this meta-analysis is that di- menhydrinate was repetitively administered in the menhydrinate increases the chance of staying free postoperative course via the rectal or i.v. route. Both from PONV by 40% if the CER is high (about 60%).
regimens were superior to placebo. There was a trend In terms of a NNT this means that ª under these cir- of dimenhydrinate being more effective when at least cumstances ª about five patients need to receive one second dose was administered postoperatively prophylaxis with dimenhydrinate for one patient to (Table 4). However, it should not left unmentioned stay free from PONV who otherwise would have suf- that five out of the six studies were published by a fered from these symptoms. Although these efficacy single center (author) in a rather homogeneous popu- data do not appear impressive, they are in the range that have been reported for newer or more common Results of the meta-analysis of randomized controlled trials on the relative efficacy of dimenhydrinate vs. placebo. Results are given for theearly observation period (0–6 h) and the overall period (0–48 h). 95% confidence intervals are given in parentheses Results of the meta-analysis of randomized controlled trials on the relative efficacy of dimenhydrinate vs. placebo for various homogeneoussubgroups. Results are given for the overall observation period (0–48 h) and only for the main outcome ‘postoperative nausea and/or vomiting’.
95% confidence intervals are given in parentheses Repetition 1 or 3¿1.2 mg/kgrectal or iv after initial1 mg/kg ivChildren P. Kranke et al.
antiemetics such as serotonin receptor antagonists whether, in children, efficacy data vary depending on (34), droperidol (12, 35) and dexamethasone (36, 37).
the application ª rectal vs. i.v./i.m. In these analyses, Although meta-analyses are frequently used, there at least, we found no clinically relevant difference in remain many issues related to the methodology that efficacy between rectal and i.v./i.m. application of the are currently being discussed intensively investigated doses. In adults, repeating the appli- Therefore, we will briefly focus this discussion on the cation of dimenhydrinate was associated with an in- major controversies that arise from this review.
creased benefit compared to single application. How- First, in contrast to newer antiemetics that have ever, these subgroup findings should be considered been investigated more recently, when more rigid and with caution as no direct comparisons are available.
controlled conditions are applied in the studies as pre- In addition, in the single application subgroup, all the requisites, dimenhydrinate has already been in use for studies are older than trials that investigated repeti- many decades. This means that the systematic review tive dosages of dimenhydrinate. In the latter group, covers studies that have been performed and pub- five out of six studies were published by one author.
lished over a long period of time. Although we ex- The differences may therefore be explained by some cluded reports that were obviously not randomized, underlying variables not controlled or whose relative it should be kept in mind that anesthetic techniques as influence was difficult to analyze retrospectively.
well as pre- and postoperative management has been Third, side-effects were not consistently reported and changed greatly, which might lead to the criticism that seldom available as a binary outcome. At least as far as pooling the results is not appropriate. However, effi- serious side-effects are concerned, dimenhydrinate cacy data were rather homogeneous and results did does not appear to be different from placebo. Non-sig- not vary when reports published before 1996 (16, 18, nificant differences or comparable incidences of side- 24, 26, 27) were excluded (data not shown). Therefore, effects were usually only stated but no data were pro- at least as far as the estimate of the ‘common effect’ is vided, making it impossible to calculate a common ef- concerned, pooling all studies seems justified.
fect and to obtain an estimation of the risk–to–benefit Second, we first calculated overall efficacy data in- ratio. Thus, a potential advantage of a meta-analysis ª cluding all trials that met the inclusion criteria and to obtain an estimate of the frequencies of side-effects thus combined a large variety of application modes.
not apparent in small studies ª could not be applied.
This raises the issue as to what extent data-pooling In conclusion, dimenhydrinate, although a tra- across trials is justified and reasonable. A compromise ditional antiemetic, is worthwhile considering when must agreed upon, balancing the aim to increase an inexpensive antiemetic is needed. Antiemetic effi- power and to lower the uncertainty of the point esti- cacy exceeds a placebo effect and is in the range that mate of the applied measure of effect (‘lumping’) may be considered clinically relevant. However, to ob- against the reasonable demand only to combine com- tain relevant absolute risk reduction it seems essential parable interventions to calculate combined efficacy to limit its use to patients who are prone to suffer data (‘splitting’). In the literature, both strategies have from PONV (43). Although in use for a long time, been applied in meta-analyses. While possible hetero- dose–response is unclear. Repeating the application of geneity, caused for instance by the use of different dimenhydrinate may be associated with increased techniques in acupuncture (invasive vs. non-invasive benefit in adults. Serious side-effects seem to be rare.
interventions), has been judged slight enough to jus-tify pooling of the data (42), and possible heteroge- References
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