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Use of Misoprostol Before Hysteroscopy:
A Systematic Review
Joan M. G. Crane, MD, FRCSC, Sarah Healey, MD, FRCSC
Department of Obstetrics and Gynecology, Memorial University of Newfoundland, St John’s NL
To evaluate the effectiveness of administering misoprostol
Évaluer l’efficacité de l’administration de misoprostol avant
prior to hysteroscopy in achieving cervical dilatation and reducing
une hystéroscopie en vue d’obtenir une dilatation cervicale et de
complications including cervical laceration.
réduire les complications (y compris les lacérations cervicales).
Computerized searches of MEDLINE, PubMed and
Sources de données :
Des recherches informatisées ont été menées
EMBASE were conducted using the key words “hysteroscopy” and
dans MEDLINE, PubMed et EMBASE au moyen des mots clés
“misoprostol.” References from identified publications were
. Les références des publications
manually searched and cross-referenced to identify additional
identifiées ont fait l’objet d’une recherche manuelle et ont été
recoupées en vue d’identifier des articles pertinents additionnels.
We included randomized clinical trials that
compared women undergoing hysteroscopy who received
Sélection des études :
Nous avons inclus les essais cliniques
misoprostol before the procedure with those who received placebo.
randomisés qui comparaient les femmes subissant une
Studies were excluded if there was no control group, if placebo
hystéroscopie qui recevaient du misoprostol avant l’intervention à
was not used, if women were not randomized, or if only the
celles qui recevaient un placebo. Les études étaient exclues si
abstract was available. Ten of 19 articles identified met the criteria
elles ne comptaient pas de groupes témoins, si elles ne faisaient
pas appel à un placebo, si leurs participantes n’étaient pasrandomisées ou si seul leur résumé était disponible. Dix des
Data Extraction and Synthesis:
The two co-authors separately
19 articles identifiés ont satisfait aux critères de l’analyse
abstracted data. Any differences in data abstraction were resolved
through discussion, and a consensus was reached. QUORUMguidelines for meta-analyses and systematic reviews of
Extraction et synthèse des données :
Les deux co-auteurs ont
randomized controlled trials were followed.
procédé séparément au résumé des données. Toutes les
In premenopausal women, misoprostol before hysteroscopy
différences quant au résumé des données ont été résolues au
resulted in a reduced need for further cervical dilatation (relative
moyen de discussions; ainsi, un consensus a pu être atteint. Les
risk [RR] = 0.61; 95% confidence interval [CI] = 0.51, 0.73), a lower
lignes directrices QUORUM visant les méta-analyses et les
rate of cervical laceration (RR 0.22; 95% CI 0.09, 0.56) and
analyses systématiques d’essais comparatifs randomisés ont été
increased cervical dilatation (weighted mean difference 2.64; 95%
CI 1.73, 3.54). In premenopausal women, misoprostol also resulted
Chez les femmes préménopausées, l’administration de
in a higher rate of side effects, including vaginal bleeding (RR
misoprostol avant l’hystéroscopie a entraîné une diminution de la
11.09; 95% CI 3.08, 40.00), cramping (RR 7.98; 95% CI 3.38,
nécessité de poursuivre la dilatation cervicale (risque relatif [RR] =
18.84), and elevated temperature (RR 5.24; 95% CI 1.37, 20.09).
0,61; intervalle de confiance [IC] à 95 % = 0,51, 0,73), un taux
For every four premenopausal women who received misoprostol
moindre de lacération cervicale (RR : 0,22; IC à 95 % : 0,09, 0,56)
prior to hysteroscopy, one woman avoided the need for further
et une dilatation cervicale accrue (différence moyenne pondérée :
cervical dilatation. For every 12 premenopausal women receiving
2,64; IC à 95 % : 1,73, 3,54). Chez les femmes préménopausées,
misoprostol, one cervical laceration was avoided.
l’administration de misoprostol a également entraîné un taux accru
In premenopausal women, misoprostol appears to be
d’effets indésirables, y compris les saignements vaginaux (RR :
promising as a cervical ripening agent prior to hysteroscopy,
11,09; IC à 95 % : 3,08, 40,00), les crampes (RR : 7,98; IC à
although further research is needed to identify the ideal dose,
95 % : 3,38, 18,84) et une hausse de la température (RR : 5,24; IC
route, and timing. Further research in postmenopausal women or
à 95 % : 1,37, 20,09). Pour chaque groupe de quatre femmes
those receiving GnRH agonists is also needed, to determine
préménopausées ayant reçu du misoprostol avant une
whether misoprostol is effective in cervical ripening in this
hystéroscopie, une femme a pu éviter d’avoir besoin d’une
dilatation cervicale accrue. Pour chaque groupe de 12 femmespréménopausées ayant reçu du misoprostol, un cas de lacérationcervicale a pu être évité.
Chez les femmes préménopausées, le misoprostol
Misoprostol, hysteroscopy, meta-analysis
semble prometteur en tant qu’agent de maturation du col avantune hystéroscopie. Cependant, de plus amples recherches
s’avèrent requises pour en identifier la dose, la voie
d’administration et la posologie idéales. De plus amplesrecherches chez les femmes postménopausées ou chez les
femmes recevant des agonistes de la gonadolibérine s’avèrent
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également requises, et ce, afin de déterminer l’efficacité du
outcomes. Any differences in data abstraction were
misoprostol pour la maturation cervicale chez cette population.
resolved through discussion, and a consensus was reached.
J Obstet Gynaecol Can 2006;28(5):373–379
QUORUM guidelines for meta-analyses and systematic
reviews of randomized controlled trials were followed.8 Sta-tistical analyses were conducted using the computer pro-
Hysteroscopy is a common gynaecologic procedure gram Review Manager 4.27 (Cochrane Collaboration,
used to investigate and treat menstrual disorders,
Oxford, UK). Heterogeneity among trials for each outcome
postmenopausal bleeding, infertility, and recurrent
was evaluated by chi-square analysis. A random effects
pregnancy loss.1,2 The procedure requires that the cervical
model was used if there was significant heterogeneity (P
canal be dilated enough to allow passage of the
0.10). For categorical data the relative risk of each outcome
hysteroscope. Complications of hysteroscopy include cervi-
for each study was calculated, and a summary relative risk
cal laceration, uterine perforation, and creation of a false
and 95% CI were calculated. For continuous data a
passage during the attempt to dilate the cervix, which may
weighted mean difference and 95% CI were calculated. A P
value of less than 0.05 was considered significant. Analyses
Misoprostol, a prostaglandin E1 analogue used in the pre-
were planned in advance for (1) premenopausal women,
vention and treatment of gastric ulcers induced by
(2) postmenopausal women and premenopausal women
non-steroidal anti-inflammatory drugs (NSAIDs), has been
receiving GnRH agonists, and (3) both groups of women
increasingly used in obstetrics and gynaecology as a cervical
combined. The number of women needed to treat to avoid
ripening agent.5–7 The purpose of this meta-analysis was to
the need for cervical dilatation prior to hysteroscopy was
evaluate the effectiveness of misoprostol prior to
hysteroscopy in achieving preprocedural cervical dilatation
premenopausal nulliparous women and of premenopausal
and reducing the need for mechanical dilatation with its
women undergoing operative hysteroscopy.
Sample size of the meta-analysis for the primary outcome ofneed for cervical dilatation prior to hysteroscopy was based
on a reduction in the primary outcome from 50% to 33%,with a two-tailed á = 0.05 and â = 0.20, requiring 143
We performed searches of MEDLINE, PubMed, andEMBASE using the keywords “hysteroscopy” and
“misoprostol” to identify studies involving human subjects
Of the 19 studies2–5,10–24 identified from the literature
published in English between January 1980 and April 2005.
search, ten10–19 were included in the meta-analysis (Figure).
References from these publications were searched manually
Nine studies were excluded: two were reviews,5,23 two were
and cross-referenced to identify additional relevant articles.
letters to the editor commenting on previous randomized
Because of lack of details regarding study methods and
clinical trials,21,22 one study was not randomized,20 one
results, abstracts and unpublished works were not included.
study compared misoprostol with laminaria,24 and three
studies did not use misoprostol.2–4 One author was con-
Studies considered eligible were randomized clinical trials
tacted to clarify information presented in the published
that compared the effects of misoprostol and placebo given
before the procedure in women undergoing hysteroscopy.
Table 1 summarizes the ten randomized clinical trials
Studies were ineligible if there was no control group, if pla-
included in the meta-analysis. Five of the studies included
cebo was not used, if treatment was not randomized, or if
only the abstract was published. The primary outcome was
postmenopausal women or those receiving GnRH
the need for further mechanical cervical dilatation. Second-
agonists,15–17,19 and one study included both groups of
ary outcomes were complications (particularly cervical
laceration and uterine perforation), side effects (nausea,
diarrhea, vaginal bleeding, cramping, and elevated tempera-
scopy,11,13–15,18,19 and one study evaluated both.12
ture), and the continuous measure of cervical dilatation.
Table 2 summarizes the outcomes of misoprostol adminis-
If an abstract described a study that did not meet eligibility
tration before hysteroscopy for all women, revealing a sig-
criteria, it was not reviewed further. Papers for all other
nificant reduction in the need for further dilatation prior to
abstracts were reviewed in detail. The two co-authors sepa-
hysteroscopy and a lower rate of cervical laceration. There
rately abstracted the data for the primary and secondary
were higher rates of side effects with misoprostol, including
Use of Misoprostol Before Hysteroscopy: A Systematic Review
Studies included in the meta-analysis
nausea, diarrhea, cramping, and fever. The use of
Further post hoc subgroup analyses were performed evalu-
misoprostol appears to be beneficial in premenopausal
women (Table 3), who had significant reductions in rates of
menopausal women undergoing operative hysteroscopy. As
cervical laceration and need for dilatation, and there was
only one study evaluated diagnostic hysteroscopy in
greater preprocedural cervical dilatation (weighted mean
premenopausal women,10 we did not have adequate sample
difference = 2.6; 95% CI 1.7, 3.5, P
< 0.0001, random
size to comment further on this particular subgroup.
effects model) in this group. These reductions were not evi-
Among premenopausal nulliparous women, the use ofmisoprostol reduced the need for further cervical dila-
dent when postmenopausal women or those receiving
tion12,13 (RR = 0.70; 95% CI = 0.59, 0.82, P
= 0.007) and the
GnRH agonists were studied (Table 4). In this group of
occurrence of cervical laceration10,12,13 (RR = 0.14;
women there was no significant difference in cervical
95% CI = 0.03,0.74, P
= 0.02). The mean cervical dilatation
dilatation with the use of misoprostol (weighted mean dif-
was also greater in the misoprostol group (weighted mean
ference = 0.1; 95% CI 0.4, 0.6, P
= 0.62, random effects
difference 3.36; 95% CI = 3.12, 3.59, fixed effects model).
model). For every four premenopausal women receiving
Among premenopausal women undergoing operative lapa-
misoprostol prior to hysteroscopy, one woman avoided the
roscopy, the use of misoprostol reduced the need for cervi-
need for further cervical dilatation.9 For every 12
cal dilatation11,13 (RR = 0.68; 95% CI = 0.58,80, P =
premenopausal women receiving misoprostol, one cervical
and the occurrence of cervical laceration11,13,14 (RR = 0.22;
95% CI = 0.08, 0.60, P
= 0.003), and resulted in an
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Table 1. Studies of misoprostol prior to hysteroscopy
increased mean cervical dilatation13 (weighted mean differ-
determined a priori the sample size required to detect a 33%
ence = 3.50; 95% CI = 3.21, 3.79, fixed effects model). As
reduction in the need for further cervical dilation (from
only one study presented data specific for premenopausal
50% to 33%). We found that misoprostol in premenopausal
nulliparous women undergoing operative hysteroscopy,13
women was an effective cervical ripening agent because it
we are unable to comment further on this subgroup.
reduced the need for further cervical dilatation and loweredthe rate of cervical laceration. There were higher rates of
When further subgroup analyses assessing the types of
complications in women who used misoprostol, including
hysteroscopy (operative or diagnostic) were performed for
vaginal bleeding, cramping, and elevated temperature, but
postmenopausal women or those receiving GnRH agonists,
these side effects were transient. We found subgroups of
no benefits with misoprostol were seen.
premenopausal women in whom misoprostol was of bene-fit: women undergoing operative hysteroscopy and women
who were nulliparous. This is not surprising, as operative
Studies of misoprostol suggest that it is very effective in ini-
hysteroscopy requires greater preprocedural dilation, and
tiating uterine contractions and inducing labour in the sec-
nulliparous women are more likely to have a narrow cervical
ond and third trimesters of pregnancy.6,7,25,26 It has also
been shown to be useful in cervical ripening before surgical
It is important to address the shortcomings of this
abortion, making the procedure easier to perform by
meta-analysis. A variety of protocols with different doses,
increasing cervical dilatation and ease of dilatation.5,25–30
routes, and frequencies of administration were used in the
Previous studies of misoprostol as a cervical ripening agent
studies included in the meta-analysis. The population of
before hysteroscopy found conflicting results depending on
women evaluated also varied. Some studies evaluated
the population studied. The small sample sizes of the indi-
premenopausal women,10–14 others evaluated post-
vidual studies meant that they lacked the statistical power to
demonstrate significant differences in some of the out-
agonists,15,19 and others studied a combination of these
comes evaluated, such as cervical laceration and the need
groups.18 Hysteroscopes of different sizes also were used,
and some studies evaluated misoprostol before operative
Use of Misoprostol Before Hysteroscopy: A Systematic Review
Table 2. Outcomes of misoprostol prior to hysteroscopy (all women)
CI: Confidence interval. * Random effects model; ** Fixed effects model
Table 3. Outcomes of misoprostol administration prior to hysteroscopy in premenopausal women
Table 4. Outcomes of misoprostol prior to hysteroscopy in postmenopausal women or those receiving GnRH
CI: Confidence interval. * Fixed effects model
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hysteroscopy and others before diagnostic hysteroscopy.
nulliparous women or those undergoing operative
Despite these heterogeneous groups, a significant differ-
hysteroscopy, because it reduces the need for further
ence was found in the primary outcome in the
mechanical cervical dilatation and reduces the rate of cervi-
premenopausal group. This meta-analysis suggests that in
cal laceration. Further research is needed to identify the
premenopausal women (and, in particular, nulliparous
ideal dose, route, and timing of misoprostol prior to the
women or those undergoing operative hysteroscopy),
procedure and to determine if misoprostol is effective in
misoprostol administration before hysteroscopy improves
cervical ripening in postmenopausal women or those
preprocedural cervical dilatation and reduces cervical lacer-
ation. Because of variations in protocols, however, we arenot able to determine the ideal dosing regimen. Other
shortcomings of the studies included in this meta-analysis
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Curr Womens Health Rep 2003;3:475–83.
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there was no evident benefit. Unfortunately, data from the
10. Ngai SW, Chan YM, Liu KL, Ho PC. Oral misoprostol for cervical priming
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11. Atay V, Duru NK, Pabuccu R, Ergun A, Tokac G, Aydin BA. Vaginal
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14. Fernandez H, Alby JD, Tournoux C, Cheuveaud-Lambling A, DeTayrae R,
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Microscopic colitisChris J. J. Mulder1, Ivar M. Harkema2, Jos W. R. Meijer31 Department of Gastroenterology, Vrije Universiteit Medisch Centrum / Free University Medical Centre, Amsterdam, the Netherlands2 Department of Gastroenterology, Ziekenhuis Rijnstate / Rijnstate Hospital, Arnhem, the Netherlands3 Department of Pathology, Ziekenhuis Rijnstate / Rijnstate Hospital, Arnhem, the Netherlands
APO-SALBUTAMOL INHALER NAME OF THE MEDICINE Chemical Name: RS)-2-tert-butylamino-1-(4-hydroxy-3-hydroxymethyl-phenyl) ethanol sulfate. C13H21NO3.½ H2SO4 Structural Formula: CAS Registry Number: 51022-70-9 DESCRIPTION Salbutamol sulfate is a white or almost white powder. It is soluble in water but is only slightly soluble in alcohol, chloroform and ether. 1.2mg of s