Comparison of carbon dioxide and normal saline for uterine distension in outpatient hysteroscopy

Uterine distension media for outpatient hysteroscopy

BACKGROUND

Hysteroscopy done in an outpatient setting is the 'gold standard' method for evaluating the uterine cavity. Media used to distend the uterine cavity include gas as carbon dioxide and liquid as saline that can be used at room temperature or warmed to body temperature. Both media offer advantages as well as disadvantages.

OBJECTIVES

The objective of this review is to compare the effectiveness, tolerability, and safety of gas (carbon dioxide) and liquid (normal saline) used for uterine distension during outpatient hysteroscopy.

SEARCH METHODS

We searched the Cochrane Gynaecology and Fertility (CGF) Group Specialised Register, CENTRAL, MEDLINE, Embase and PsycINFO on 28 April 2021. We checked references of relevant trials and contacted study authors and experts in the field to identify additional studies. CINAHL records and ongoing trials from the trial registries were included in the CENTRAL search.

SELECTION CRITERIA

We included randomised controlled trials (RCTs) comparing saline with carbon dioxide, as well as RCTs comparing saline at different temperatures, for uterine distension in outpatient hysteroscopy done for any indication.

DATA COLLECTION AND ANALYSIS

We used standard methodological procedures recommended by Cochrane. Primary review outcomes were patient tolerability and adverse events or complications related to the distending medium. Secondary outcomes were quality of the hysteroscopic view and duration of the procedure.

MAIN RESULTS

We included 12 RCTs (1946 women). The quality of evidence ranged from very low to high: the main limitations were risk of bias due to absence of blinding due to the nature of the procedure, imprecision, and inconsistency. Saline versus carbon dioxide Analysis ruled out a clinically relevant difference in pain scores during the procedure between saline and carbon dioxide, but the quality of evidence was low (standardised mean difference (SMD) -0.07, 95% confidence interval (CI) -0.17 to 0.02; 9 RCTs, N = 1705; I² = 86%). This translates to differences of 0.39 cm (lower) and 0.05 cm (higher) on a 10-cm visual analogue scale (VAS). Evidence was insufficient to show differences between groups in the proportion of procedures abandoned due to intense pain (Peto odds ratio (OR) 0.48, 95% CI 0.09 to 2.42; 1 RCT, N = 189; very low-quality evidence). We are uncertain whether saline decreases the need for analgesia compared to carbon dioxide (Peto OR 0.34, 95% CI 0.12 to 0.99; 1 RCT, N = 189; very low-quality evidence). Saline compared to carbon dioxide is probably associated with fewer vasovagal reaction events (Peto OR 0.53, 95% CI 0.32 to 0.86; 6 RCTs, N = 1076; I² = 0%; moderate-quality evidence) and fewer shoulder-tip pain events (Peto OR 0.28, 95% CI 0.14 to 0.54; 4 RCTs, N = 623; I² = 0%, moderate-quality evidence). Evidence suggests that if 10% of women undergoing outpatient hysteroscopy experience a vasovagal reaction event with the use of carbon dioxide, this rate would be between 3% and 9% with the use of saline. Similarly, if the rate of shoulder-tip pain with carbon dioxide is 9%, it would be between 1% and 5% with saline. We are uncertain whether saline is similar to carbon dioxide in terms of endometrial bleeding (Peto OR 0.83, 95% CI 0.25 to 2.75; 2 RCTs, N = 349; I² = 0%; very low-quality evidence). Infection was not reported by any study in this comparison. Saline may result in fewer procedures with an unsatisfactory hysteroscopic view than carbon dioxide (Peto OR 0.51, 95% CI 0.32 to 0.82; 5 RCTs, N = 1082; I² = 67%; low-quality evidence). The duration of the procedure was shorter with saline in three of the four studies that reported this outcome, and duration was similar in both arms in the fourth study. Warm saline versus room temperature saline Use of warm saline for uterine distension during office hysteroscopy may reduce pain scores when compared with room temperature saline (mean difference (MD) -1.14, 95% CI -1.55 to -0.73; 3 RCTs, N = 241; I² = 77%; low-quality evidence). Evidence is insufficient to show differences between groups in either the proportion of procedures abandoned due to intense pain (Peto OR 0.97, 95% CI 0.06 to 15.87; 1 RCT, N = 77; very low-quality evidence) or the need for analgesia (Peto OR 1.00, 95% CI 0.14 to 7.32; 1 RCT, N = 100; very low-quality evidence). Analysis ruled out a clinically relevant difference in duration of the procedure between warm and room temperature saline, but the quality of evidence is low (MD 13.17 seconds, 95% CI -12.96 to 39.29; 2 RCTs, N = 141; I² = 21%). No cases of infection were reported in either group (1 RCT, N = 100). No other adverse events and no information on quality of the hysteroscopic view were reported by any study in this comparison.

AUTHORS' CONCLUSIONS

Evidence was insufficient to show differences between different distension media used for uterine distension in outpatient hysteroscopy in terms of patient tolerability, operator satisfaction, or duration of the procedure. However, saline was superior to carbon dioxide in producing fewer adverse events (shoulder-tip pain and vasovagal reaction).

A Systematic Review of the Effect of Type, Pressure, and Temperature of the Distension Medium on Pain During Office Hysteroscopy

OBJECTIVE

To identify the optimal distension medium type, pressure, and temperature to minimize pain during office hysteroscopy.

DATA SOURCES

MEDLINE, EMBASE, CINAHL, and CENTRAL were searched from inception to January 29, 2020.

METHODS OF STUDY SELECTION

We included randomized controlled trials in which women undergoing office hysteroscopy were randomized to either a distension medium type, pressure, or temperature against a suitable control, where pain was an outcome. Data regarding feasibility, visualization, complications, and satisfaction were also collected.

TABULATION, INTEGRATION, AND RESULTS

The literature search returned 847 studies, of which 18 were included for systematic review and 17 for meta-analysis. There was no significant difference in intraprocedural pain when comparing the use of normal saline against carbon dioxide (standardized mean difference [SMD], -0.12; 95% confidence interval [CI], -0.36 to 0.13). Subgroup analysis of high-quality studies revealed a statistically significant reduction in postprocedural pain with normal saline (SMD, -0.65; 95% CI, -1.14 to -0.16). Side effects were less frequent (Peto odds ratio, 0.29; 95% CI, 0.20-0.40) and patient satisfaction was higher (SMD, 1.39; 95% CI, 0.51-2.28) with normal saline compared with carbon dioxide. Pressures of ≤40 mm Hg reduced intraprocedural pain (SMD, -0.67; 95% CI, -1.09 to -0.26) at the expense of a higher proportion of unsatisfactory views (81%-89% at ≤40 mm Hg vs 95%-99% at ≥50 mm Hg). Postprocedural pain was reduced with lower filling pressures. Warming saline did not reduce intraprocedural pain (SMD, 0.59; 95% CI, -0.14 to 1.33).

CONCLUSION

Normal saline, instilled at the lowest pressure to acquire a satisfactory view, should be used for uterine distension during office hysteroscopy to minimize pain.

A lariat-based dilatation device for hysteroscopy: an in vitro study

Background

Hysteroscopy is regarded as the golden standard for the therapeutic and diagnostic methods of many uterine diseases. Carbon dioxide, normal saline and pharmaceuticals are generally used to dilate the uterus to obtain enough operating space and clear vision during the surgery. However, these methods often cause various syndromes.

Methods

In this study, we designed a novel mechanical dilator and operating system. The dilator contains a structure with a diameter of 9 mm in its initial status to pass through the narrow cervix after initial cervical dilation by cervical dilator and then its diameter can be expanded up to 60 mm in the working status to achieve a favorable operating space. The operating system is composed of an endoscope and the surgical instrument driving tube. The endoscope was motioned by pre-bent hyperelastic wires and the surgical instrument was driven by a pre-bent driving tube. To obtain the parameters for successful expansion and operation, the relationships between the tension, the diameter of the dilator and the visual and operating space of the operating system were analyzed in detail. On the basis of the obtained parameters, the surgical experiment was performed and the experimental results demonstrated the ability of this dilator to expand and the ability of the operator to operate in small spaces for hysteroscopy.

Results

According to the achieved results, the dilator could support the inner wall of the simulated organ to act like a cage, so that the space in the cage was large enough. The operating system can thrust into the intracavity of the simulated uterus through the channel (with a diameter of 6 mm) of the dilator to search for and excise the raised polyp.

Conclusions

It can be concluded that the proposed dilator and operating system can be efficiently applied in organ expansion and operation in hysteroscopy.

Application of office hysteroscopy in gynaecological practice

Introduction: Nowadays minimally invasive techniques are a leading factors in medicine. According to this trend, hysteroscopy has been used in gynecology more and more frequently. Office hysteroscopy gives opportunity for a faster examination with less costs and strain for the patient. Aim: The aim of this work was to get familiar with the novel method. The author examined the level of pain during hysteroscopy performed for different indications with different types of instruments. In addition, the novel method invented for evaluating tubal patency was compared to the gold standard laparoscopy in 70 tubes. Method: Office hysteroscopy was performed in 400 cases for indications according to the traditional method. All examinations were performed in University of Debrecen, Department of Obstetrics and Gynecology in an outpatient setting. A 2.7 mm diameter optic with diagnostic or operative sheet was used. Hysteroscopies were scheduled between the 4th and 11th cycle day. For recording pain level VAS was used in 70 cases. Comparison of hysteroscopic evaluation of tubal patency to the laparoscopic method was studies in 70 cases. Results: It was found that office hysteroscopy can be performed in an outpatient setting, without anesthesia. Pain level showed no difference among subgroups (nulliparous, non-nulliparous, postmenopausal, diagnostic, operative) (mean±SD, 3.5±1.01; p=0.34). For the evaluation of tubal patency, office hysteroscopy showed 92.06% accuracy when compared to laparoscopy. Conclusions: Office hysteroscopy has several advantages over traditional method. This procedure is fast, it has less strain for the patient. The novel method, rather than traditional hysteroscopy, should be used in the work-up of infertility as well. Orv. Hetil., 2014, 155(40), 1589–1597.

Hysteroscopy: guidelines for clinical practice from the French College of Gynaecologists and Obstetricians

The objective of this study was to provide guidelines for clinical practice from the French College of Obstetrics and Gynecology (CNGOF), based on the best evidence available, concerning hysteroscopy. Vaginoscopy should be the standard technique for diagnostic hysteroscopy (Grade A) using a miniature (≤3.5mm sheath) (Grade A) rigid hysteroscope (Grade C), using normal saline solution distension medium (Grade C), without any anaesthesia (conscious sedation should not be routinely used), without cervical preparation (Grade B), without vaginal disinfection and without antibiotic prophylaxy (Grade B). Misoprostol (Grade A), vaginal oestrogens (Grade C), or GnRH agonist routine administration is not recommended before operative hysteroscopy. Before performing hysteroscopy, it is important to purge the air out of the system (Grade A). The uterine cavity distention pressure should be maintained below the mean arterial pressure and below 120mm Hg. The maximum fluid deficit of 2000ml is suggested when using normal saline solution and 1000ml is suggested when using hypotonic solution. When uterine perforation is recognized during operative hysteroscopy using monopolar or bipolar loop, the procedure should be stopped and a laparoscopy should be performed in order to eliminate a bowel injury. Diagnostic or operative hysteroscopy is allowed when an endometrial cancer is suspected (Grade B). Implementation of this guideline should decrease the prevalence of complications related to hysteroscopy.

[Prevention of the complications related to hysteroscopy: guidelines for clinical practice]

OBJECTIVE

To provide clinical practice guidelines (CPGs) from the French college of obstetrics and gynecology (CNGOF), based on the best evidence available, concerning the adverse events related to hysteroscopy.

MATERIALS AND METHODS

Review of literature using following Keywords: hysteroscopy; vaginoscopy; infection; perforation; intrauterine adhesions

RESULTS

Vaginoscopy should be the standard technique for outpatient hysteroscopy (grade A) using a miniature (≤ 3.5mm sheath) (grade A) rigid hysteroscope (grade C), using normal saline solution distension medium (grade C), without any anesthesia (conscious sedation should not be routinely used), without cervical preparation (grade B), without vaginal disinfection and without antibiotic prophylaxy (grade B). Misoprostol (grade A), vaginal estrogens (grade C), or GnRH agonist routine administration is not recommended before operative hysteroscopy. Before performing hysteroscopy, it is important to purge the air out of the system (grade A). The uterine cavity distention pressure should be maintained below the mean arterial pressure and below 120 mmHg. The maximum fluid deficit of 2000 mL is suggested when using normal saline solution and 1000 mL is suggested when using hypotonic solution. When uterine perforation is recognized during operative hysteroscopy using monopolar or bipolar loop, the procedure should be stopped and a laparoscopy should be performed in order to eliminate a bowel injury. Diagnostic or operative hysteroscopy is allowed when an endometrial cancer is suspected (grade B).

CONCLUSION

Implementation of this guideline should decrease the prevalence of complications related to office and operative hysteroscopy.

Office hysteroscopy: current trends and potential applications: a critical review

Office hysteroscopy is an excellent method of identifying and treating intracavitary uterine lesions. It has become easy to learn and perform; as an aid of modern technological applications, it is safe, accurate, provides immediate results under direct visualisation, and offers the additional benefit of histological confirmation and the discomfort of patients is minimal. We applied an extended literature search to explore the special features and details of the technique itself, as it evolved since it first appeared 30 years back. Our initial goal was to examine potential changes/improvements of the modality, in terms of the instrumentation used and the technique itself, the indications of use, its incorporation in daily practice, and patients' and clinicians' acceptability.

Hysteroscopy: a technique for all? Analysis of 5,000 outpatient hysteroscopies

OBJECTIVE

1) To investigate the relationship between operator experience and the success of outpatient hysteroscopy; and 2) to determine if the introduction of normal saline and the use of narrow-caliber hysteroscopes and vaginoscopic approach are associated with a lower failure rate.

DESIGN

Retrospective study.

SETTING

Teaching-hospital based outpatient hysteroscopy clinic.

PATIENT(S)

Five thousand consecutive women undergoing outpatient hysteroscopy between October 1988 and June 2003.

INTERVENTION(S)

The hysteroscopies were carried out both by experienced operators and by trainees. Procedures were performed using 4-mm and 2.9-mm telescopes with 5-mm and 3.5-mm diagnostic sheaths, respectively. Between October 1988 and 1996, the uterine cavity was distended with CO(2) (CO(2) period), whereas normal saline was preferred after 1997 (1997-2003: saline period). Traditional technique of hysteroscope insertion and vaginoscopic approach were used depending on operator preference and experience and patient characteristics.

MAIN OUTCOME MEASURE(S)

Success, failure, and complication rates.

RESULT(S)

The hysteroscopies were successfully performed in nearly 95% of cases by 362 operators (mean 13.8 hysteroscopies per operator) with different levels of expertise. Failure and complication rates were 5.2% and 5.4%, respectively, without any significant difference between CO(2) and saline periods. Vasovagal attacks and shoulder pain were significantly higher during the CO(2) period. The success of outpatient hysteroscopy was negatively affected by postmenopausal status, nulliparity, need for cervical dilatation or local anaesthesia, traditional technique of hysteroscope insertion, and use of a 5-mm hysteroscope.

CONCLUSION(S)

A high level of expertise is not a prerequisite to performing hysteroscopy on an outpatient basis. Recent advances in technique and instrumentation facilitate this approach and might encourage greater adoption by the wider gynecology community.

Efficacy of intravenous tramadol treatment for reducing pain during office diagnostic hysteroscopy

OBJECTIVE

To assess whether IV tramadol before outpatient hysteroscopy could reduce procedure-related pain.

DESIGN

A randomized double-blind placebo controlled trial.

SETTING

Outpatient Hysteroscopy Centre in the Department of Obstetrics and Gynaecology of Cagliari University.

PATIENT(S)

Fifty healthy, parous, women who underwent outpatient diagnostic hysteroscopy and endometrial biopsy.

INTERVENTION(S)

Random IV infusion of tramadol or placebo before hysteroscopy and endometrial biopsy were performed.

MAIN OUTCOME MEASURE(S)

Visual analogue scale of pain was measured both immediately after and 15 minutes after the procedure. Stress hormones (ACTH, cortisol), blood pressure, and heart frequency were evaluated before, during, and 15 minutes after the procedure.

RESULT(S)

In the tramadol group, the visual analogue scale of pain was significantly lower than in the placebo group both immediately after the procedure and 15 minutes later. Basal levels of ACTH and cortisol did not differ between the groups. In both groups, the ACTH levels remained unchanged during the study, and the cortisol levels were higher 15 minutes after the procedure than before the procedure. Procedure time, heart frequency, blood pressure, and adverse effects did not differ between the groups.

CONCLUSION(S)

In parous women without uterine malformations, a treatment with tramadol before hysteroscopy and endometrial biopsy appears to be capable of reducing the pain and discomfort that are associated with this procedure.

Office hysteroscopy and adenomyosis

Adenomyosis, the heterotopic presence of endometrial glands and stroma within the myometrium, has traditionally been diagnosed by the pathologist in hysterectomy specimens. However, the recent development of high-quality non-invasive techniques such as transvaginal sonography (TVS), magnetic resonance imaging (MRI) and hysteroscopy has renewed interest in diagnosing adenomyosis in the office prior to any treatment. Hysteroscopy offers the advantage of direct visualization of the uterine cavity, and since nowadays it is performed in the office, it can be offered as a first-line diagnostic tool for evaluation of uterine abnormalities in patients with abnormal uterine bleeding and/or infertility. The available data clearly indicate that high-quality mini-hysteroscopes, saline as a distension medium, and atraumatic insertion technique are essential for the success of office hysteroscopy. The procedure is indicated in any situation in which an intrauterine anomaly is suspected; it is immediately preceded by a physical exam and a TVS to evaluate uterine characteristics, and it is followed by a second TVS to take advantage of the intracavitary fluid for a contrast image of the uterus. Although diagnostic hysteroscopy does not provide pathognomonic signs for adenomyosis, some evidence suggests that irregular endometrium with endometrial defects, altered vascularization, and cystic haemorrhagic lesion are possibly associated with the entity. In addition to the direct visualization of the uterine cavity, the hysteroscopic approach offers the possibility of obtaining endometrial/myometrial biopsies under visual control. Since they can be performed in the office, the combination of TVS, fluid hysteroscopy and contrast sonography is therefore a powerful screening tool for detecting endometrial and myometrial abnormalities in association with adenomyosis.

Vaginoscopic versus conventional approaches to outpatient diagnostic hysteroscopy: a two-centre randomized prospective study

BACKGROUND

To compare the tolerability and feasibility of the transvaginal and standard approaches in outpatient diagnostic hysteroscopy.

METHODS

This randomized prospective trial was carried out in two centres to compare the transvaginal (n = 200) and conventional (n = 200) approaches during outpatient hysteroscopy. Patients were randomized by a computer-generated list. The main outcome measure was pain during the examination, measured on a visual analogue scale (VAS) graded from 0 to 10 (0 = lowest, 10 = highest). Secondary criteria were ease of instrument passage through the cervix, investigation quality and its duration. For data analysis, we used the chi-squared test or Fischer's exact test for qualitative variables and the Mann-Whitney U-test for quantitative variables.

RESULTS

Median VAS was rated at 0.5 for the vaginoscopic and 2 for the standard (P < 0.0001) approaches. The approaches did not differ significantly in investigation quality, procedure duration or ease of cervical passage (although the latter was more often easy transvaginally).

CONCLUSIONS

The transvaginal approach is better tolerated than the conventional technique in outpatient diagnostic hysteroscopy.

Prospective multicentre randomized controlled trial to evaluate factors influencing the success rate of office diagnostic hysteroscopy

BACKGROUND

Diagnostic hysteroscopy is not widely performed in the office setting, one of the reasons being the discomfort produced by the procedure. This randomized controlled trial was performed to evaluate the effects of instrument diameter, patient parity and surgeon experience on the pain suffered and success rate of the procedure.

METHODS

Patients were randomly assigned to undergo office diagnostic hysteroscopy either with 5.0 mm conventional instruments (n=240) or with 3.5 mm mini-instruments (n=240). Procedures were stratified according to patient parity and surgeon's previous experience. The pain experienced during the procedure (0-10), the quality of visualization of the uterine cavity (0-3) and the complications were recorded. The examination was considered successful when the pain score was <4, visualization score was >1 and no complication occurred.

RESULTS

Less pain, better visualization and higher success rates were observed with mini-hysteroscopy (P <0.0001, P <0.0001 and P <0.0001, respectively), in patients with vaginal deliveries (P <0.0001, P <0.0001 and P <0.0001, respectively) and in procedures performed by experienced surgeons (P=0.02, P=NS and P=NS, respectively). The effects of patient parity and surgeon experience were no longer important when mini-hysteroscopy was used.

CONCLUSIONS

Our data demonstrate the advantages of mini-hysteroscopy and the importance of patient parity and surgeon experience, suggesting that mini-hysteroscopy should always be used, especially for inexperienced surgeons and when difficult access to the uterine cavity is anticipated. They indicate that mini-hysteroscopy can be offered as a first line office diagnostic procedure.

Selecting distending medium for out-patient hysteroscopy. Does it really matter?

BACKGROUND

The aim of this prospective randomized study was to evaluate the role of carbon dioxide (CO2) and normal saline for diagnostic accuracy in out-patient hysteroscopy.

METHODS

Women admitted to our Department in order to undergo total abdominal hysterectomy also underwent diagnostic hysteroscopy, 12-24 h prior to surgery. The selection of distending medium was made after randomization. Two groups of patients were formed, group A (CO2; n=39) and group B (normal saline; n=35). More than half of the women in the study population were post-menopausal. Post-hysteroscopy, all women were asked to rank any symptom that they felt during the procedure on a 4-point scale (0=none; 1=mild; 2=severe; 3=inability to perform hysteroscopy). The hysteroscopic diagnosis was compared with the macroscopic findings and the histological examination of the surgical specimen after hysterectomy.

RESULTS

The percentage who completed hysteroscopy was 89.74% within group A and 97.14% within group B. Most patients of both groups felt some pain of mild intensity. The diagnostic accuracy of hysteroscopy was similar for both media when major pathology [large polyps (group A 91.7%; group B 92.7%), myomas (group A 81.25%; group B 92.7%) and/or hyperplasia (group A 87.5%; group B 90.2%)] of the endometrial cavity was detected. In contrast, in cases of minor pathology (small polyps, mucosal elevations, crypts, hypervascularization), hysteroscopy with saline presented with significantly higher diagnostic accuracy (85.4%) compared with hysteroscopy with CO2 (64.6%).

CONCLUSIONS

In out-patient hysteroscopy, CO2 and normal saline were comparable with regard to patient discomfort and for the detection of major pathology of the endometrial cavity. Normal saline seems to be the most appropriate medium for the detection of minor pathology of the endometrial cavity.

The technique and overview of flexible hysteroscopy

Flexible hysteroscopy is a safe, successful, and reliable method of investigation for abnormal uterine bleeding. When compared with rigid hysteroscopy flexible hysteroscopy is associated with less pain both at introduction of the hysteroscope and during the procedure itself especially when the diameter of the scope is reduced. This article provides evidence of the benefits of flexible hysteroscopy to the health service provider, clinician, and patient. Flexible hysteroscopy is acceptable to most women when performed in the outpatient setting without analgesia and offers a suitable alternative to rigid hysteroscopy.

Risk of Vasovagal Syndrome During Outpatient Hysteroscopy

STUDY OBJECTIVE

To evaluate influence of hysteroscope type and media used during outpatient hysteroscopy on vasovagal syndrome risk.

STUDY DESIGN

Prospective observational study (Canadian Task Force classification II-1).

SETTING

University hospital.

PATIENTS

Two thousand seventy-nine women undergoing outpatient hysteroscopy without analgesia.

INTERVENTION

Office hysteroscopy with a flexible or rigid hysteroscope and normal saline or CO(2).

MEASUREMENTS AND MAIN RESULTS

Fifteen cases of vasovagal syndrome were reported. The rate of vasovagal syndrome was higher with use of a rigid hysteroscope (12/647 [1.85%]) vs. a flexible hysteroscope (3/1432 [0.21%]), p =.00013; p =.009 after adjustment for medium used; and with the use of CO2 (10/426 [2.34%]) vs. saline solution (5/1653 [0.30%]), p <.0001; p =.014 after adjustment for hysteroscope type.

CONCLUSION

Risk of vasovagal syndrome is higher with the use of a rigid hysteroscope and CO2, regardless of the indication for hysteroscopy or the parity and menopausal status of the patient.

Randomised comparison of distension media for outpatient hysteroscopy

OBJECTIVE

To compare saline with and without added lignocaine and carbon dioxide distension for out patient hysteroscopy with regards to patient discomfort and hysteroscopic view.

DESIGN

Single blind prospective randomised controlled trial.

SETTING

Specialist out patient clinics in a large teaching hospital.

POPULATION

Women undergoing out patient hysteroscopy and endometrial biopsy for abnormal uterine bleeding.

METHOD

Out patient hysteroscopy using carbon dioxide, saline or saline with lignocaine.

MAIN OUTCOME MEASURES

Visual analogue score (VAS) for pain and present pain intensity (PPI) as assessed by patients and the quality of hysteroscopic view as assessed by the operator.

RESULTS

Of the 305 women approached, 300 women were randomised into the study. The mean [SD] VAS for pain in the carbon dioxide group was 2.9 [2.3] and in the saline group was 3.1 [2.6], the difference was not statistically significant (P= 0.49). The mean [SD] VAS for pain in the saline plus lignocaine group was 3.2 [2.4]. This was not significantly different from the saline group (P= 0.72). There was a statistically significant difference between the confidence rating for the hysteroscopic view for the carbon dioxide compared with the saline group; mean [SD] was 8.3 [2.1] and 9.6 [1.1], respectively (P= 0.001).

CONCLUSION

Carbon dioxide and saline as distension media are comparable in terms of overall patient discomfort and satisfaction, but saline provides better views and increases confidence in diagnosis. Adding lignocaine to the saline distension medium does not confer any additional benefit.

A systematic review of transvaginal ultrasonography, sonohysterography and hysteroscopy for the investigation of abnormal uterine bleeding in premenopausal women

BACKGROUND

To determine the accuracy of transvaginal ultrasonography, sonohysterography and diagnostic hysteroscopy for the investigation of abnormal uterine bleeding in premenopausal women.

DESIGN

Systematic review of common diagnostic imaging tests.

DATA SOURCES

Relevant papers were identified through electronic searching of MEDLINE (1980 to July 2001) and EMBASE (1980 to July 2001) and manual searching of a bibliography of primary and review articles.

REVIEW METHODS

Studies were selected if accuracy of transvaginal ultrasonography, sonohysterography and diagnostic hysteroscopy was compared with a reference standard and included data that could be abstracted into a two-by-two table in order to calculate sensitivity and specificity. Quality assessment and data extraction were performed by at least two independent reviewers. Diagnostic accuracy was determined by calculating positive and negative likelihood ratios for all intrauterine pathologies, submucous fibroids and endometrial hyperplasia.

RESULTS

Nineteen studies met the inclusion criteria. Statistically significant heterogeneity was present between the likelihood ratios for studies of transvaginal ultrasound. A positive test result with sonohysterography diagnosed submucous fibroids with a pooled likelihood ratio of 29.7 (17.8, 49.6). A positive test result with hysteroscopy diagnosed submucous fibroids with a pooled likelihood ratio of 29.4 (13.4, 65.3), and any intrauterine pathology with a pooled likelihood ratio of 7.7 (4.3, 13.7). A negative test result with hysteroscopy for diagnosing any intrauterine pathology had a pooled likelihood ratio of 0.07 (0.04, 0.15).

CONCLUSION

Although there was considerable variability present between the studies, all three diagnostic tests were moderately accurate in detecting intrauterine pathology. However, sonohysterography and hysteroscopy performed better than transvaginal ultrasound in detecting submucous fibroids.

Use of carbon dioxide versus normal saline for diagnostic hysteroscopy

OBJECTIVE

To compare CO2 and normal saline as distention medium in diagnostic hysteroscopy.

DESIGN

Prospective randomized study.

SETTING

University-based artificial insemination and sterility center in Italy.

PATIENT(S)

Seventy-four women who underwent hysteroscopy.

INTERVENTION(S)

Hysteroscopy was performed with CO2 or normal saline.

MAIN OUTCOME MEASURE(S)

Quality of intrauterine images, cervical dilatation, local anesthesia, and duration of the test. In addition, each patient evaluated pain during and after the examination, irritation of the phrenic plexus, analgesic use, and side effects.

RESULT(S)

The quality of the hysteroscopic image was statistically similar for both media. Dilatation of the cervical canal and use of local anesthesia was more often necessary in the CO2 group. The procedure time was 5.96 +/- 1.55 minutes in the CO2 group and 3.12 +/- 0.96 in the normal saline group. The CO2 group reported pain more frequently during and after the examination, shoulder pain, greater analgesic use, and more side effects.

CONCLUSION(S)

For hysteroscopy, normal saline is technically equal to CO2 in terms of image quality and ease of use but offers more advantages. Hysteroscopy with normal saline is more acceptable to patients, quicker to perform, and entails fewer additional procedures.

Carbon dioxide versus normal saline as a uterine distension medium for diagnostic vaginoscopic hysteroscopy in infertile patients: a prospective, randomized, multicenter study

OBJECTIVE

To evaluate the satisfaction rate, efficacy, and complication rate of carbon dioxide (CO(2)) versus normal saline as a uterine distension medium for outpatient diagnostic vaginoscopic hysteroscopy in infertile patients.

DESIGN

Prospective, randomized multicenter study.

SETTING

Hysteroscopy units in two university hospitals and in a private center.

PATIENT(S)

One hundred eighty-nine infertile women undergoing outpatient hysteroscopy.

INTERVENTION(S)

Outpatient hysteroscopy was performed with CO(2) (group A) or normal saline (group B) and with endometrial biopsy when indicated.

MAIN OUTCOME MEASURE(S)

Quality of the visualization of the uterine cavity, procedure time, complications, patient discomfort, and satisfaction rate.

RESULT(S)

Significantly lower abdominal and shoulder tip pain and a lower incidence of vasovagal reactions were observed in group B in comparison with group A. A higher satisfaction rate and a lower operative time were obtained in the normal saline group in comparison with the CO(2) group. Moreover, group A required significantly more analgesics after the procedure than group B.

CONCLUSION(S)

Uterine distension with normal saline seems to have less adverse effects and is better tolerated by patients. Moreover, it allows operative procedures to be performed with the new bipolar instruments.

Minimally invasive exploration of the female reproductive tract in infertility

Classically, invasive and non-invasive tests are performed to evaluate the causes of infertility. Transvaginal hydrolaparoscopy (THL) allows the exploration of the pelvic structures with a mini-endoscope, using a vaginal needle-guided trocar introduction technique and saline as a distension medium. A first study on 349 patients demonstrated the feasibility of the procedure and gave a high patient satisfaction. Access to the pouch of Douglas was achieved in 330 patients (94.5%) under local anaesthesia and in an ambulatory environment. The mean pain score measured on a visual analogue scale of 10 was 2.7, comparable to the score of mini-hysteroscopy only and significantly lower than the scores of hysterosalpingography with either metal cannula or balloon catheter. A total of 96% of the patients agreed to repeat the procedure under the same circumstances if required. The diagnostic accuracy of the technique was demonstrated in a prospective study, in which two independent endoscopists explored 10 patients with both THL and standard laparoscopy. The inter-observer agreement for ovarian adhesions was 75% for standard laparoscopy and 90% for THL. In addition, in patients with mild endometriosis, more peri-ovarian adhesions were detected with THL than with standard laparoscopy. A multinational survey to evaluate the risk and outcome of bowel injury during THL registered 24 (0.65%) cases in 3667 procedures. In all cases, the diagnosis was made immediately and the treatment was conservative without complications.

Intrauterine adhesions after conservative and surgical management of spontaneous abortion

STUDY OBJECTIVE

To determine the frequency of intrauterine adhesions (IUA) after conservative management, medical evacuation, and surgical evacuation for spontaneous abortion.

DESIGN

Prospective follow-up study (Canadian Task Force classification II-2).

SETTING

Gynecology unit in a teaching hospital.

PATIENTS

Eighty-two women who had been treated with conservative management, medical evacuation, or surgical evacuation of retained products of conception after spontaneous abortions in a randomized, controlled trial.

MEASUREMENTS AND MAIN RESULTS

Hysteroscopic diagnosis of IUA 6 months after initial treatment was the primary outcome measure. No cases of IUA were found in patients managed conservatively or by medical evacuation, whereas two cases (7.7%) of filmy IUA were detected in those managed by surgical evacuation. There was no statistical significant difference in the rate of self-reported reduced menstrual flow 6 months after initial treatment by any method.

CONCLUSION

The prevalence of IUA was low after each modality of treatment for spontaneous abortion. Conservative management and medical evacuation are both acceptable alternatives to standard surgical evacuation.

Flexible versus rigid endoscopes for outpatient hysteroscopy: a prospective randomized clinical trial

To evaluate patient acceptance, optical properties and the clinical feasibility of flexible compared with rigid hysteroscopes, 142 patients undergoing outpatient hysteroscopy were included in a prospective, randomized clinical trial. The flexible hysteroscope was used in 70 patients, and the rigid instrument in 72. At different stages of the hysteroscopy the level of pain experienced by the women was assessed using a 10 cm visual analogue scale. Optical properties characterized by the parameters intrauterine visibility, hysteroscopic view and diagnostic accuracy were ranked by the surgeons using a 5-point scale (1 = excellent to 5 = insufficient), and duration of the hysteroscopy was measured. Hysteroscopy was successful in 87.5 and 100% of patients in the flexible and rigid groups respectively. With the use of rigid telescopes, discomfort at introduction and during the hysteroscopy was significantly greater (median 1.7 versus 0.7, P = 0.003; 3.1 versus 1.2, P < 0.001 respectively), but optical properties were judged to be far superior (P < 0.001 for all three comparisons) and procedure time was significantly shorter (median 70 versus 120 s, P = 0.003). In conclusion, outpatient hysteroscopy seems to be less painful when using flexible telescopes. However, rigid hysteroscopes provide superior optical qualities and permit a more rapid performance with higher success rates at much lower cost.

Endometrial cell dissemination at diagnostic hysteroscopy: a prospective randomized cross-over comparison of normal saline and carbon dioxide uterine distension

The incidence of pelvic spreading of endometrial cells at diagnostic hysteroscopy was studied comparing the two distension media carbon dioxide (CO(2)) and normal saline (N/Saline). Thirty patients requiring laparoscopy and hysteroscopy were included in this study, the main indication for surgery being subfertility. Hysteroscopy was performed using both CO(2) and N/Saline distension on each patient, the order of the distension media being randomly allocated. Samples of peritoneal fluid were aspirated from the pouch of Douglas before and after hysteroscopy with each distension medium, and the specimens were investigated cytologically for the presence of endometrial cells. Endometrium was present in 2/30 (6.7%) peritoneal aspirates before and in 15/60 (25%) collected after the hysteroscopies. There was no major difference between liquid or gaseous distension, transtubal reflux of endometrial cells occurring in 7/30 (23.3%) and in 8/30 (26.7%) hysteroscopies respectively. Positive peritoneal cytology was observed significantly more often in patients who were in the proliferative phase of the menstrual cycle [9/14 (64.3%) versus 0/11, P < 0.004]. In conclusion, transtubal dissemination of endometrium occurs in about one quarter of patients, irrespective whether N/Saline or CO(2) is used for uterine distension; there is no advantage to using gaseous distension for hysteroscopy when investigating high-risk cases for endometrial malignancy.

A prospective randomized study comparing hysteroscopy and curettage (H & C) under local anaesthesia (LA) and general anaesthesia (GA) in Chinese population

OBJECTIVE

To compare the difference in patient's acceptance of local anaesthesia (LA) and general anaesthesia (GA) hysteroscopy and curettage in Chinese population.

DESIGN

A prospective randomized study.

SUBJECTS AND METHODS

In the period September 1994 to August 1995, all Chinese women with abnormal uterine bleeding or suspected uterine anomaly who warranted hysteroscopy and uterine curettage were invited to participate in this study with informed consent. They were randomly allocated to the control (i.e. GA) and study (i.e. LA) group.

RESULTS

Overall 90% of the controls and 91% of the study group were satisfied with the procedure. The hysteroscopic diagnostic accuracy was 83%. Significantly higher percentage of patients in the study group opted for the same form of admission arrangement if given the choice.

CONCLUSION

Hysteroscopy and curettage under LA and GA are equally acceptable in the Chinese population in Hong Kong. The patient satisfaction rate is high in both groups. Hysteroscopic diagnosis is highly accurate in malignant condition (100% sensitivity and 83% specificity).

Hysteroscopy in women with abnormal uterine bleeding on hormone replacement therapy: a comparison with postmenopausal bleeding

OBJECTIVE

To determine the role of outpatient diagnostic hysteroscopy in patients with abnormal uterine bleeding (AUB) on hormone replacement therapy (HRT) and to contrast this with a control group of women presenting with postmenopausal bleeding.

DESIGN

Comparative observational study.

SETTING

Outpatient hysteroscopy clinic in a university hospital.

PATIENTS

Three hundred ten patients undergoing outpatient hysteroscopy.

INTERVENTIONS

Outpatient diagnostic hysteroscopy with endometrial biopsy when indicated.

MAIN OUTCOME MEASURES

Hysteroscopic findings, need for cervical dilatation and local anaesthesia, correlation between hysteroscopy and histologic diagnosis.

RESULTS

There were 157 (7.1%) patients with AUB on HRT and another 153 (6.9%) with postmenopausal bleeding out of 2,203 outpatient hysteroscopies. Hysteroscopy was successful in 97% and 92% of patients, respectively, and intrauterine pathology was diagnosed in 46.7% and 39.7% of these cases. Functional endometrium was noted significantly more often with HRT and endometrial atrophy with postmenopausal bleeding. Overall, local anesthesia was used in 126 (40.6%) and shown to be associated significantly with the need for cervical dilatation. Endometrial biopsy was attempted in 125 (80%) and 119 (78%) patients in the study and control groups, but was unsuccessful significantly more often with postmenopausal bleeding (38.7%) versus 16%). There were six cases of endometrial carcinoma, all in the control group.

CONCLUSION

There is a high incidence of intrauterine abnormalities in women with menstrual symptoms while taking HRT, but the pathology differed from those with postmenopausal bleeding. As focal lesions are found commonly in such patients, their detection by diagnostic hysteroscopy should improve compliance with HRT as it would allow individualization of treatment.