Department of Reproductive Medicine and Science, Imperial College, St Mary's Hospital, Mint Wing, Praed Street, London W2 1PG, UK
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Abstract |
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Key words: biochemical indices/ovarian stromal volume/polycystic ovarian syndrome/three-dimensional ultrasonography
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Introduction |
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The advent of ultrasound scanning provides a non-invasive procedure for the assessment of ovarian size, morphology and internal structure, namely follicles and stroma. Swanson et al. were the first to describe the ultrasound ovarian volume enlargement associated with PCOS (Swanson et al., 1981). Adams et al. then refined the ultrasound diagnosis of PCOS, including also follicle number and ovarian stromal characteristics (Adams et al., 1985
). The typical polycystic ovarian morphology is defined by the presence of enlarged ovaries containing an increased number of small follicles (28 mm) arranged peripherally around a dense echogenic stroma.
The ultrasound finding of polycystic ovaries in the general population is in the order of 1722% (Polson et al., 1988; Clayton et al., 1992
; Cresswell et al., 1997
), and in women with anovulation and idiopathic hirsutism is much higher at ~90% (Adams et al., 1986
; O'Driscoll et al., 1994
).
Although several ultrasound features such as total ovarian volume and stromal hypertrophy (Dewailly et al., 1993) and increased stromal blood flow (Loverro et al., 2001
) have been shown to correlate accurately with PCOS, a correlation between the degree of ultrasound morphology changes and the severity of the endocrinopathy in women with PCOS has not been extensively investigated (van der Westhuizen and van der Spuy, 1996
).
The advent of sophisticated new systems such as computerized three-dimensional (3D) ultrasound scanning permits visualization of the transverse plane of the pelvis and more accurate measurement of the total ovarian volume and stromal volume. The precision and high degree of reproducibility of ovarian and endometrial volume measurements obtained using this technique have been reported (Kyei-Mensah et al., 1996a,b
).
The present prospective observational study was designed to investigate the relationship between the ultrasound features of PCOS, measured more accurately using 3D transvaginal ultrasound scan, with biochemical indices in women with clomiphene citrate (CC)-resistant PCOS.
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Materials and methods |
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Since the cycles were anovulatory, a withdrawal bleed was induced with 10 mg oral medroxyprogesterone acetate (Provera®; Pharmacia and Upjohn, Bucks, UK) daily for 5 consecutive days. Serum LH, FSH and testosterone concentrations were determined on day 24 of the cycle. LH and FSH concentrations were measured by means of conventional immunoradiometric assay. The intra-assay variation was <5% and the inter-assay variation was <8%. Testosterone concentrations were measured by radioimmunoassay. The intra-assay variation was <4% and the inter-assay variation was <11%.
All women had a 3D transvaginal pelvic ultrasound scan on the same day as hormonal measurements were taken, by a single observer, using a high-frequency 7.5 MHz Voluson transvaginal transducer attached to the Combison 580 system (Kretztechnik AG, Zipf, Austria). All ultrasound measurements were taken in real time. Women with ovarian follicles 10 mm or any other ovarian cysts or endometriomas were excluded from the study. Polycystic ovarian morphology was diagnosed when there were more than 10 follicles with diameter
8 mm arranged peripherally or scattered throughout an echodense core of stroma (Adams et al., 1986
; Polson et al., 1988
). Total ovarian volume, follicle number and total follicular volume were measured by rotating the transducer crystal through 360° for ~10 sec. During this time, starting from the tissue margin, the outlined contour changes resulting from serial sections using a rollerball cursor were stored sequentially in the computer memory. The ovarian stromal volume was calculated by subtracting the total follicular volume from the total ovarian volume in each case.
Results are presented as mean ± SD. The data were analysed by two-way analysis of variance. Correlation analysis was performed using Pearson's correlation test. Differences between means were assessed by Student's t-test. All data was found to be normally distributed by the ShapiroWilk W-test. The software Statistics Package for Social Sciences 10.0 for Windows (Chicago, IL, USA) was used for statistical calculations. P < 0.05 was considered statistically significant.
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Results |
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The relationship between the ultrasound features (total ovarian volume, stromal volume, follicle number and follicular volume) and biochemical indices (FSH, LH and testosterone) is shown in Table II.
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Discussion |
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This is in contrast to the findings of Kyei-Mensah et al. who showed a positive correlation between stromal volume, as measured by 3D ultrasound, with serum androstenedione concentrations, but not with any other endocrine parameter, including testosterone, in infertile women with PCOS (Kyei-Mensah et al., 1998). The hyperandrogenaemia of PCOS can be demonstrated with the routine measurement of serum testosterone alone and, therefore, androstenedione is not routinely measured in our practice.
Using two-dimensional (2D) ultrasound, Pache et al. reported a statistically significant relationship between follicle number, ovarian volume and stroma echogenicity with serum LH and testosterone concentrations (Pache et al., 1993). Another study using conventional 2D ultrasonography scanning demonstrated a significant correlation between ovarian volume and serum androstenedione concentrations in PCOS patients (Puzigaca et al., 1991
). These studies sustain the general opinion that ovarian stromal changes and total ovarian volume enlargement associated with chronic hyperandrogenic anovulation are distinctive features of PCOS. However, the use of 3D ultrasound in our study suggests that total ovarian volume, total follicle number and follicular volume are the most important ultrasound features.
Previous evidence (van Hooff et al., 1999) has suggested that blood sampling in the menstrual phase and its relation to progestogen administration in women with PCOS may underestimate any endocrine changes. This may be the reason why some studies have shown no relationship between ultrasound findings and biochemical indices. However, in this study a relationship was demonstratedalthough this may have been greater had the sampling been performed in the specific oligomenorrheic phase.
It has been reported that 3D ultrasonography is a system with a high degree of reproducibility and significantly increased precision compared with conventional 2D ultrasound volume measurements (Kyei-Mensah et al., 1996a,b
). An advantage of using a 3D ultrasound scan is its ability to measure follicular volume accurately, which may be subtracted from the total ovarian volume in order to estimate stromal volume more accurately (Wu et al., 1998
). Using a conventional 2D ultrasound scan, ultrasonography assessment of women with PCOS is limited to measurement of total ovarian volume only (Balen et al., 1995
), because this system has no facility for the visualization of the many pre-antral follicles simultaneously in three planes. Therefore, the additional measurements of follicular and stromal volume using computerized 3D ultrasonography improve the accuracy and reproducibility of measurement of the ultrasound features of PCOS.
Although ovarian stroma is still important in the pathophysiology of PCOS (White et al., 1995; Gilling-Smith et al., 1997
), 3D assessment of the ultrasound features traditionally used in the diagnosis of PCOS suggests that total ovarian volume and the total pre-antral follicle number and follicular volume are more important. The implication is that it is the follicular volume which is the important component of the total volume, rather than the stromal volume.
The different findings in our prospective observational study compared with those of other studies are unlikely to be due to the fact that the women had CC-resistant PCOS. A prospective study performed in 22 infertile women has demonstrated that there is no difference in the stromal index and ovarian volume between CC-resistant and CC-sensitive PCOS groups (Al-Took et al., 1999). Therefore, these differences are most likely to be as a result of the more accurate determination of stromal volume by 3D rather than 2D ultrasound scanning.
In conclusion, this is the first report showing that ovarian stromal volume, as assessed by 3D ultrasonography, does not correlate with biochemical indices of PCOS. However, the total ovarian volume, total pre-antral follicular volume and pre-antral follicle number do correlate with these indices.
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Notes |
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References |
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Submitted on August 2, 2001; resubmitted on October 15, 2001; accepted on November 24, 2001.