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Carugno, J.; Watrowski, R.; Vitale, S.G.; Barra, F.; D'alterio, M.N.; Sathyapalan , T.; , .; Reyes-Muñoz, E.; Lin, L.; Angioni, S. Abnormal Uterine Bleeding in Perimenopausal Women. Encyclopedia. Available online: https://encyclopedia.pub/entry/23239 (accessed on 20 April 2024).
Carugno J, Watrowski R, Vitale SG, Barra F, D'alterio MN, Sathyapalan T, et al. Abnormal Uterine Bleeding in Perimenopausal Women. Encyclopedia. Available at: https://encyclopedia.pub/entry/23239. Accessed April 20, 2024.
Carugno, Jose, Rafał Watrowski, Salvatore Giovanni Vitale, Fabio Barra, Maurizio Nicola D'alterio, Thozhukat Sathyapalan ,  , Enrique Reyes-Muñoz, Li-Te Lin, Stefano Angioni. "Abnormal Uterine Bleeding in Perimenopausal Women" Encyclopedia, https://encyclopedia.pub/entry/23239 (accessed April 20, 2024).
Carugno, J., Watrowski, R., Vitale, S.G., Barra, F., D'alterio, M.N., Sathyapalan , T., , ., Reyes-Muñoz, E., Lin, L., & Angioni, S. (2022, May 23). Abnormal Uterine Bleeding in Perimenopausal Women. In Encyclopedia. https://encyclopedia.pub/entry/23239
Carugno, Jose, et al. "Abnormal Uterine Bleeding in Perimenopausal Women." Encyclopedia. Web. 23 May, 2022.
Abnormal Uterine Bleeding in Perimenopausal Women
Edit

Abnormal uterine bleeding (AUB) is a frequent symptom in perimenopausal women. It is defined as uterine bleeding in which the duration, frequency, or amount of bleeding is considered excessive and negatively affects the woman’s quality of life (QoL) and psychological well-being.

abnormal uterine bleeding hysteroscopy perimenopause

1. Abnormal Uterine Bleeding (AUB) in Perimenopausal Women

Perimenopause is the period between the first symptoms of diminished ovarian function, usually beginning in the early forties, lasting up to two years after the Final Menstrual Period (FMP). The variety and inconsistency of perimenopause definitions imply that a sharp distinction between “premenopausal”, “perimenopausal”, and “postmenopausal” AUB is difficult. In 1996, the World Health Organization defined perimenopause as “the period immediately prior to menopause (when the endocrinological, biological and clinical features of menopause begin) and the first year after menopause” [1]. In contrast, the term menopausal transition should be reserved for “that period of time before FMP when variability in the menstrual cycle is usually increased” [1]. Still, some studies arbitrarily set lower and upper limits of perimenopause, e.g., between 40 and 54 [2] or 42 and 52 [3] years of age or from four years before to 12 months after FMP [4].
Researchers define the “perimenopausal AUB” as any abnormal menstrual bleeding during menopausal transition or within the first year after menopause (except for cyclic bleeding in women using hormonal replacement therapy) [1][3][5]. AUB is the leading cause of approximately one-third of all outpatient gynecological visits, particularly in the perimenopausal period [3][4][5]. More than 90% of women experience at least one episode of AUB, and 78% of them at least three episodes of AUB during their transition to menopause [3]. The popular classification of nongestational causes of AUB was introduced by FIGO (International Federation of Gynecology and Obstetrics) in 2011 and revised in 2018 (Figure 1) [6][7][8]. The causes of nongestational AUB have been classified into nine categories arranged according to the acronym PALM-COEIN, including the structural causes (“PALM”): polyp, adenomyosis, leiomyoma, malignancy/hyperplasia, and non-structural causes (“COEIN”): coagulopathy, ovulatory dysfunction, endometrial, iatrogenic, and “not otherwise classified” [6][7]. The contribution of individual PALM-COEIN categories to the spectrum of AUB causes changes with age; nevertheless, endometrial polyps and fibroids remain the most common structural causes of AUB in perimenopause [9][10][11]. In the fourth decade of life, the impact of myomas and adenomyosis as AUB causes increases. Likewise, the highest incidence of endometrial polyps is reported in women aged 40–44 years [12]. Notably, the rate of structural pathologies (fibroids, polyps, adenomyosis) coexisting with each other or with uterine malignancies also increases with age [13][14]. Additionally, various local or systemic conditions, and hormonal or non-hormonal medications (tamoxifen, oral anticoagulants), can trigger uterine bleeding. Hematologic dysfunctions are also a frequent cause of AUB in perimenopausal women, being reported as the cardinal symptom in 32–100% of women with von Willebrand factor deficiency (relevant to 0.5–1% of the general population), in 5–98% of women with platelet dysfunction, and 35–70% of women with rare factor deficiencies [15]. Although the annual probability of spontaneous conception is about 10% by age 40–44, falling to 3% by age 45–49, the percentage of women fulfilling their reproductive goals in their fourth decade is continuously rising [16]. However, 84% of pregnancies in women over 48 years end in first-trimester miscarriage, and the rate of ectopics in women over 44 years rises to 7% [17]. Therefore, up to 12 months after FMP, excluding pregnancy is a mandatory part of the AUB diagnostic workup.

2. Initial Diagnostic Evaluation of AUB

The self-reported perception of AUB by the woman is the first step to determine its impact on QoL. It is well known that the patient’s subjective estimation does not always correlate with the objective amount of blood loss [18]. According to Munro et al. [6], menstrual bleeding exceeding 80 mL, as well as any intermenstrual and postcoital bleeding, should be considered abnormal. Nevertheless, about 14% of patients with mild to moderate blood loss consider their bleeding as heavy, and 40% of women with excessive blood loss consider their bleeding as standard [19]. In those cases, Pictorial Blood Assessment Charts can be helpful for the semiquantitative determination of AUB [20].
Figure 1. FIGO classification of abnormal uterine bleeding. Adapted from [8].
A detailed medical history (including hereditary disposition for uterine malignancies), the vaginal speculum exam, and transvaginal ultrasound (TVS) are essential parts of evaluating patients complaining of AUB [7][14][21]. However, standard diagnostic criteria and reproducibility of TVS are not consistent [14], and the accuracy of TVS in diagnosing benign uterine conditions is suboptimal [22][23]. TVS is helpful to exclude endometrial cancer (EC) in postmenopausal women if the endometrial echo is less than or equal to 4 mm, providing a negative predictive value of >99% [24]. The advantage of TVS is the holistic assessment of the uterus and its surrounding structures [7][24]. Saline infusion sonohysterography (SIS) offers a superior detection rate of benign lesions compared to TVS, but costs, convenience, and tolerability are the limiting factors [25][26]. Laboratory tests, e.g., hemoglobin and human chorionic gonadotropin determination, supplement the physical examination and sonography. Further laboratory tests may be indicated to uncover hereditary bleeding disorders or hormonal alterations depending on the history and the developed clinical suspicion.

3. Role of Hysteroscopy in the Management of Women with AUB

Hysteroscopy is considered the gold standard technique for diagnosing and managing pathological conditions affecting the uterine cavity [27][28]. In turn, AUB is the most common indication to perform hysteroscopy in perimenopausal women [29]. The hysteroscopic “see-and-treat” approach allows exploration of the uterine cavity, targeted endometrial and endocervical biopsies, and—if indicated—immediate treatment of endocervical, endometrial, or submucosal pathologies (polyps, myomas) [24][30][31][32][33][34]. It is essential to highlight that hysteroscopy is unsuitable for evaluating and treating deep myometrial pathologies (such as adenomyosis or myomas FIGO-Grade ≥ 3). Most hysteroscopic procedures can be performed in an office setting depending on the patient’s preferences, available infrastructure (staffing, equipment), surgeon’s experience, and comfort level [24][28][31][32][33][34]. More complex and prolonged procedures, such as hysteroscopic myomectomy and extensive lysis of intrauterine adhesions, are typically performed in the operating room, thus providing the patient with general anesthesia and the ability of the surgeon to perform more extensive surgery. Moreover, hysteroscopy can be complemented with laparoscopy if necessary [24][28][35][36]. Regardless of the setting in which the hysteroscopic procedure is completed, it is helpful to distinguish diagnostic and operative hysteroscopy.

3.1. Diagnostic Hysteroscopy

Diagnostic hysteroscopy aims to diagnose lesions within the endometrial cavity and, if necessary, to obtain targeted biopsies [24][28][37]. Diagnostic hysteroscopy can be a single intervention or may immediately precede hysteroscopic surgery. The feasibility of diagnostic hysteroscopy decreases in patients with previous surgeries, pelvic infections, IUD use, and postmenopausal status. Cobellis et al. [38] developed a predictive score for office hysteroscopy failure using different predictors, the most significant of which were history of procedures on the cervix, cesarean section, recurrent vaginitis, retroflexed uterus, and menopause. Depending on the previously indicated factors, office hysteroscopy could not be completed in 6 to 76% of the interventions [38].
AUB is the presenting sign in >90% of postmenopausal women with EC [39]. In turn, the prevalence of EC or atypical hyperplasia in postmenopausal women with AUB is 21%, rising to 29% when AUB is accompanied by an endometrium thickness of ≥4 mm on TVS [39]. The systematic review by Clark et al. [40] confirmed high diagnostic accuracy of hysteroscopy with regard to EC, but only moderate for other types of endometrial disease. When comparing studies on the diagnostic accuracy of hysteroscopy, it is helpful to distinguish between studies reporting results based only on the hysteroscopic view and those obtained after a hysteroscopically-guided biopsy. For example, Elfayomy et al. [41] found “hysteroscopy” (meaning hysteroscopic image of the pathology) insufficient to exclude endometrial hyperplasia and cancer in women with AUB, based on 0.57/0.50 sensitivity and 0.92/0.94 specificity for endometrial hyperplasia and cancer, respectively (Figure 2).
Figure 2. Pedunculate low-risk endometrial polyp in the posterior uterine wall during diagnostic hysteroscopy (intraoperative picture by F.B. and S.F.).
Similarly, Garuti et al. [42] used the terms “hysteroscopy” and “hysteroscopic view” interchangeably, reporting a low sensitivity (0.64 and 0.61) and specificity (0.92 and 0.95) for the diagnosis of endometrial hyperplasia. In the study of De Franciscis et al. [43], the concordance between the final histopathological result and the hysteroscopic impression was 86% for benign disease or normal endometrium, but only 58% for endometrial hyperplasia. In addition, the lowest agreement (52%) was noted for postmenopausal endometrial hyperplasia. When restricted to women with postmenopausal AUB, the sensitivity and specificity of in-office hysteroscopy for endometrial hyperplasia (with histopathology as reference) was 87% and 43%, respectively [43]. In contrast, Tinelli et al. [44] not only confirmed the diagnostic superiority of hysteroscopy with an eye-directed biopsy for detecting endometrial pathologies compared to TVS (and thus recommended hysteroscopy for all postmenopausal women with AUB and endometrial thickness > 4 mm) but also demonstrated the unique efficiency of hysteroscopy for diagnosing focal abnormalities (including EC) in the atrophic endometrium that would otherwise likely be missed by TVS. The authors advocate hysteroscopic evaluation even in patients with AUB with endometrium on TVS of <4 mm, aiming to decrease the chance of failing to diagnose carcinomas that develop focally in the atrophic endometrium (Figure 3) [44].
Figure 3. Ultrasonographic appearance of uterine lesion suspected for early-stage endometrial cancer (A). The diagnostic hysteroscopic allows for visualizing the suspected uterine area (B) and for obtaining the histologic biopsy (C,D). Intraoperative photographs by F.B. and S.F.
Less threatening but a more common finding in patients with AUB (20–31% of cases) are endometrial polyps [9][10][11][25][33]. The sensitivity of TVS for the diagnosis of polyps is particularly low (0.51) [25]. In contrast, in women with postmenopausal AUB, the sensitivity and specificity of hysteroscopy for the diagnosis of polyps are reported at 0.81–0.92 and 0.85–0.98, respectively [11][26]. The study by de Godoy Borges et al. [23] confirmed the superiority of diagnostic hysteroscopy (96.4% sensitivity, 74.6% specificity) in comparison to TVS (88.7% sensitivity, 25.4% specificity) for detecting endometrial polyps in women aged 41 to 82 presenting with AUB. Saline Infusion Sonohysterogram (SIS) provides a similar sensitivity compared with hysteroscopy but lower specificity (0.93 and 0.83 compared to 0.95 and 0.90, respectively). Finally, a recent meta-analysis reported sensitivity and specificity of 0.87 and 0.86, 0.62 and 0.73, and 0.92 and 0.85 for SIS, TVS, and hysteroscopy, respectively, for detecting endometrial polyps in women with AUB [11]. Similarly, hysteroscopy offers the highest diagnostic accuracy (>90%) for detecting submucous myomas as compared to TVS or SIS [45]. Further developments in the field of sonography, based on the three-dimensional virtual image synthesis (so called “virtual sonographic hysteroscopy”), will show to what extent diagnostic hysteroscopy could be replaced by next-generation, three-dimensional imaging modalities for detecting intracavitary uterine pathologies [46].

3.2. Operative Hysteroscopy

Operative hysteroscopy uses mechanical, electrosurgical, and laser instruments to treat intracavitary pathologies. The introduction of the small-diameter coaxial bipolar electrode (Versapoint, Gynecare, Ethicon, NJ, USA) in 1999 was a milestone for outpatient operative hysteroscopy (Figure 4) [47]. The development of miniaturized mechanical instruments with small diameter scopes and working channels with continuous flow systems enabled the “see-and-treat” approach without general anesthesia [32][34][48][49][50]. Wortman et al. [51] confirmed that major operative hysteroscopic surgery could be performed in an office-based setting resulting in a 98.8% rate of “satisfied” or “very satisfied” patients. Both outpatient (73%) and inpatient (80%) hysteroscopic polypectomy offer comparable success rates, as determined by the patients’ subjective bleeding and QoL assessment after six months [52]. However, procedure failure is higher (19% vs. 7%), and acceptability is lower (83% vs. 92%) with outpatient compared to inpatient polypectomy [52]. An essential aspect of hysteroscopic surgery is a very high level of physician satisfaction (e.g., 95% reported in [53]) associated with this approach. Factors such as incomplete resection and recurrence of the pathology decrease the acceptability of hysteroscopic surgery [38][52].
Figure 4. Operative hysteroscopic removal of an endometrial polyp (mean diameter 13 mm) by Versapoint system (Gynecare, Ethicon Inc., Raritan, NJ, USA). Intraoperative photographs by F.B. and S.F.
As with any other surgical procedure, hysteroscopic operations can be associated with complications. Every second complication of operative hysteroscopy is mechanical (52%), including cervical lacerations, uterine perforations, and injuries to the adjacent organs such as the bowel or bladder, sometimes associated with internal bleeding and conversion to laparoscopy or laparotomy [54][55]. Further short-term complications, such as excess fluid absorption, pulmonary edema, critical electrolyte disbalance, or genital tract burns, and long-term consequences (intrauterine adhesions) should be mentioned [54][55][56]. Venous air embolism during endometrial resection/endometrial ablation (ER/EA) or hysteroscopic myomectomy, although exceedingly rare (1:1140 surgeries), is a potentially fatal complication [57][58]. Myomectomies are hysteroscopic procedures with the highest complication rate (up to 14%) and the highest risk of distension medium-related complications (more than seven times more common compared to polypectomy) [54]. The application of monopolar energy is associated with more frequent local and systemic adverse events (perforations, burns, hyponatremia) as compared to bipolar energy [59][60]. Many of these complications can be prevented by strict adherence to basic surgical principles, e.g., limited use of monopolar devices [59][60]. Furthermore, some complications of intracavitary resections, e.g., intrauterine adhesions, can be successfully reduced by the use of antiadhesive barriers [61].

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