Menstrual cycle irregularity in bulimia nervosa: Associated factors and changes with treatment
Introduction
Disturbances in menstrual cycle function are commonly associated with eating disorder pathophysiology. Amenorrhea occurs almost universally in anorexia nervosa and is thought to be a consequence of malnutrition-induced impairments in gonadotropin (particularly luteinizing hormone (LH)) secretory patterns [1]. Despite maintenance of normal body weight, in bulimia nervosa (BN), amenorrhea may occur in 7–40% of patients [2], [3], [4], [5], [6]. The occurrence of irregular menstrual cycles (oligomenorrhea) appears to be more common. Studies have consistently found that oligomenorrhea occurs within the range of 37–64% of women with BN [3], [7], [8], [9], [10].
The exact etiology of menstrual dysfunction in BN is yet to be clarified. Biochemical studies have shown that menstrual disturbances in BN are associated with reduced oestradial [11], noradrenalin [12] and LH concentrations, and reduced LH pulse frequency [13], [14]. Ultrasonograpghy has revealed abnormal ovarian morphology in BN with 76–100% of patients having polycycstic ovaries [10], [15]. Polycycstic ovary syndrome is a common cause of oligomenorrhea in normal women and is associated with an insulin-induced elevation in circulating androgen concentrations [16]. Thus, it has been suggested that abnormalities in insulin secretion as a result of large fluctuations in food intake may be responsible for the very high prevalence of polycycstic ovary syndrome in BN [10].
Clinical variables that have been associated with menstrual disturbance in normal weight BN include a current weight that is 85% less than past high weight [12], a history of anorexia nervosa and a past weight loss to less than 92% of the ideal body weight [17].
The present analysis determined the association between clinical and nutritional variables and menstrual disturbance in women presenting for treatment with normal weight BN. In addition, we investigated factors associated with the continuation of menstrual disturbance at 12 months follow-up.
Section snippets
Pretreatment assessment
Participants in this study were 82 women (aged 17–45 years) who were assessed consecutively prior to entry to an outpatient trial designed to explore the additive efficacy of exposure with response prevention to cognitive behavioural therapy for BN [18]. All participants met DSM-IV criteria for BN, purging type [19]. Exclusion criteria were current anorexia nervosa, a body mass index (BMI) less than 17 or greater than 30 kg/m2 and current use of psychoactive medication. Recruitment was via
Participant characteristics
The physiological and clinical characteristics of participants are shown in Table 1. Women who had undergone a hysterectomy or who were using oral contraceptives were excluded from analysis. Participants who reported an absent or irregular menstrual cycle within the past 3 months were categorised as irregular and the remaining women were classified as regular menstruators. The mean BMI of participants was within the normal range (between 20 and 25) and participants binged and purged
Discussion
The occurrence of menstrual irregularity prior to treatment in 45% of women with normal weight BN in this study is within the 37–56% range found by others [3], [8], [9], [10]. This figure is substantially higher than the 5–12% prevalence rates of oligomenorrhea found in college-aged women [26]. In addition to confirming a relatively high prevalence of oligomenorrhea, this study identified previously unexamined clinical and nutritional variables associated with menstrual disturbance in women
Acknowledgements
This study was supported by a grant from the Health Research Council of New Zealand. The authors thank Ms. Leslie Livingston and Dr. Patrick Sullivan for their assistance with data management and patient assessment.
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