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Carol Henshaw is a consultant general adult psychiatrist in Cheshire and senior lecturer in psychiatry at Keele Universitys School of Medicine (Academic Unit of Psychiatry, Harplands Hospital, Hilton Road, Stoke on Trent, ST4 6TH, UK. Email: chenshaw{at}doctors.org.uk). She has a special interest in perinatal psychiatry and menstrual mood disorders and was President of the Marcé Society from 20042006.
| Abstract |
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| What is premenstrual syndrome? |
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A diagnosis of discrimination?
Although these diagnoses are accepted by researchers and clinicians, the existence of these disorders continues to be debated. Some, particularly psychologists writing from a feminist perspective, still see the diagnostic label as continuing the oppression of women by the medical profession. Only 5 years ago Chrisler & Caplan (2002) described premenstrual syndrome as a form of social control and victim blame. They expressed concerns that women with premenstrual dysphoric disorder recorded in their medical record might be seen as unfit mothers in child custody cases and as unsuitable candidates for positions of authority or political office, thus leading to increased bias and discrimination against women. In the 1980s, premenstrual syndrome was accepted as a cause of diminished responsibility in two prominent UK murder trials, fuelling the popular notion that hormonal changes can turn women into dangerous criminals (Raitt & Zeedyk, 2002: pp. 109134).
A culture-based construct?
In December 2003, Eli Lilly removed premenstrual dysphoric disorder from the indications for fluoxetine in the UK, Austria, Greece and Portugal. The reasons given were that it is not listed as a condition in ICD10, remains a research diagnosis in DSMIV, is not a well-established disease entity within Europe and that women with less severe symptoms might erroneously receive a diagnosis of premenstrual dysphoric disorder and inappropriate treatment (Moynihan, 2004).
Chrisler & Caplan also described premenstrual syndrome as culture-bound and recognised predominantly by women and researchers in Western countries. Many of the participants in early studies were indeed women attending specialist or private services in the West, but more recently community studies have been undertaken that include women from wider social groupings. Wittchen et al(2002) carried out a large epidemiological study of young women aged 1429 in Germany using structured diagnostic interviews. They found the 12-month prevalence of premenstrual dysphoric disorder to be 5.8% (consistent with the rates of 310% found in several other studies); a further 18.6% were found to have sub-threshold symptoms (which might fit a diagnosis of premenstrual syndrome). Lifetime rates for comorbid anxiety disorders (especially post-traumatic stress disorder), mood disorders, somatoform disorders and nicotine dependence were high, with only 26.5% having no other mental disorder. The diagnosis remained stable over 48 months and participants with premenstrual dysphoric disorder were more likely than those without to develop a new-onset depressive disorder. They also had higher utilisation of health services and higher rates of self-harm, suggesting that considerable morbidity is associated with this diagnosis.
A community study of women aged 3644 in the USA (Cohen et al, 2002) found similar rates of pre-menstrual dysphoric disorder. The diagnosis was associated with a lower educational level, a history of major depression, smoking and working outside the home. Broadly similar prevalences have now been reported in widely differing countries and cultures, including Iceland (Sveinsdottir & Marteinsdottir, 1991), Mexico (Marvan, et al, 1998) and Saudi Arabia (Rasheed & Al-Sowielem, 2003), although a Japanese study reported lower rates (Takeda et al, 2006).
| Effects of premenstrual syndrome |
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The above epidemiological studies confirm the findings of the earlier work, which studied more select populations: women with premenstrual dysphoric disorder have higher lifetime rates of affective disorder, but the precise relationship between premenstrual syndrome/premenstrual dysphoric disorder and mood disorders remains unclear. Premenstrual syndrome differs from depression in its wider symptom profile, including physical symptoms such as bloating, mastalgia and headache. The most commonly reported psychological symptom is irritability rather than depressed mood. Although premenstrual symptoms respond well to selective serotonin reuptake inhibitors (SSRIs), the onset of the depression is more rapid than that of major depression and may well involve different mechanisms. A good review of psychiatric morbidity in premenstrual syndrome and premenstrual dysphoric disorder is given by Kim et al(2004).
| Womens views |
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| Aetiology |
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It is now clear that premenstrual syndrome and premenstrual dysphoric disorder involve an abnormal response to a normal hormonal environment as symptoms appear to be dependent on ovulation (they do not appear in anovulatory cycles). The gonadal steroids or some other factor produced by the corpus luteum in the second half of the menstrual cycle are the likely triggers. As not all women are affected there must also be some underlying vulnerability.
Studies attempting to elucidate the pathophysiology of the syndrome concentrate on three main areas: the hypothalamicpituitaryadrenal (HPA) axis, the
-aminobutyric acid (GABA) system and the serotonergic system.
The HPA axis
Dysregulation of the HPA axis is associated with major depression and it is therefore not surprising that it has also been investigated in relation to premenstrual syndrome. Basal plasma and urinary free cortisol do not appear to distinguish women with premenstrual syndrome from controls nor do circadian patterns. The results of studies examining cortisol responses to stressors or stimulation have been conflicting and in several studies women with premenstrual syndrome have failed to show the HPA axis abnormalities characteristic of major depression.
The GABA system
Other researchers have looked at the role of progesterone, GABA and neuroactive steroids (or neurosteroids). Sundström Poromaa et al(2003) carried out a comprehensive review of GABA, progesterone and premenstrual dysphoric disorder. Allopregnanolone is a neuroactive metabolite of progesterone that has anaesthetic and anxiolytic properties. It binds with high affinity to the GABA-A receptor. Dysregulation of allopregnanolone and GABA systems may play a role in premenstrual syndrome and recent studies support this hypothesis. Levels of allopregnanolone appear to fall after antidepressant treatment, and falls in this metabolite are associated with improved depression and reduced appetite changes (Freeman et al, 2002a). Proton magnetic resonance spectroscopy has been used to examine cortical GABA levels in premenstrual dysphoric disorder. A reduction in cortical GABA levels during the follicular phase has been found in women with premenstrual dysphoric disorder compared with controls. Cortical GABA levels declined across the menstrual cycle in healthy women, whereas those with premenstrual dysphoric disorder experienced an increase from the follicular phase to the mid- and late-luteal phases. Oestradiol and progesterone were positively associated with GABA levels in women with premenstrual dysphoric disorder (Epperson et al, 2002), who also show abnormal motor cortex excitability during the luteal phase (Smith et al, 2003).
The serotonergic system
Considerable evidence supports the involvement of the serotonergic system in the pathophysiology of premenstrual syndrome, not least the fact that SSRIs are effective in treating the symptoms. Inhibition of serotonergic activity by acute tryptophan depletion has been shown to aggravate symptoms of premenstrual dysphoric disorder. Furthermore, metergoline, a serotonin-selective antagonist that blocks serotonin (5-HT) receptors (particularly 5-HT2A and 5-HT2C) also provokes a return of symptoms in women with premenstrual dysphoric disorder treated with fluoxetine (Roca et al, 2002).
Endogenous opioids
Women with premenstrual dysphoric disorder appear to have lower pain thresholds and lower pain-tolerance times than controls. They have a heightened sensitivity to ischaemic pain at all phases of the cycle, but rate this pain as being more intense and more unpleasant in the luteal phase. Compared with controls they have lower ß-endorphin levels throughout the cycle (Straneva et al, 2002). All of these findings suggest that endogenous opioids may be involved.
Summing up
It is likely that all these neurotransmitter systems are involved, but the nature of their complex interactions and any common pathways that may give rise to premenstrual symptoms are not yet understood. The review by Halbreich (2003) is probably the most comprehensive and up to date available.
| Assessment |
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Various scales are available, but for clinical use it is best to choose one that the patient can complete quickly and the doctor can easily read and assess during a clinic. The vast majority are in English (often American English) and, despite international studies, very few have been validated in other languages. Haywood et al(2002) have reviewed most of the currently available measures, commenting on their strengths and weaknesses. One of the easiest to use in clinical settings is the Calendar of Premenstrual Experiences (COPE). The woman rates 22 items (physical and behavioural) on a four-point scale (0, symptom not present; 4, symptom severe). It has high testretest reliability, which is useful in a prospective measure. Its criterion validity was assessed in clinical and community samples and it correctly identified women in the premenstrual syndrome group from those in the control group in 104 out of 108 cycles (a 2.8% false-negative rate with no false positives). Above all, it is simple to use and score, although some American terms (e.g. hot flashes) might require explanation.
The lack of evidence for any abnormality of serum hormone levels underlines the fact that it is rarely necessary to check hormone levels in women referred for premenstrual problems (although they frequently request this and often attribute their difficulties to hormone imbalances). Take note of menstrual cycle phase when assessing mental state.
Symptoms may have been present for several years, perhaps since menarche, but women often present when they have other stressors and chronic difficulties in their lives. Harmful use of alcohol and other substances is not uncommon and some will have psychiatric comorbidity. Some present when they experience heavy or irregular menstrual bleeding or pelvic pain. A gynaecologist should see such women before psychiatric assessment, in order to exclude other pathologies.
| Management |
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| Box 1 Treatments for premenstrual syndrome and premenstrual dysphoric disorder: effectiveness determined from systematic literature reviews Effective interventions
Interventions that improve mastalgia only
Interventions that have no effect on premenstrual symptoms
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The efficacy of SSRIs in the treatment of both physical and psychological symptoms of premenstrual syndrome (Dimmock et al, 2000) has been confirmed and studies have shown that these drugs also reduce functional impairment. The onset of improvement is more rapid than that in SSRI treatment of depressive disorder. Treatment can be given throughout the menstrual cycle, but several studies now support dosing during the luteal phase alone, as this appears to be equally efficacious (Freeman et al, 2004). One randomised controlled trial (RCT) has found 90 mg enteric-coated fluoxetine given twice during the luteal phase both efficacious and well tolerated (Miner et al, 2002) and similar data now exist for controlled-release paroxetine. However, neither of these formulations is currently available in the UK. Women with irregular cycles can find intermittent dosing difficult, so it is not suitable for all. It may be useful in particular for women concerned about taking medication continuously (see below). There is RCT evidence to support the use of venlafaxine (Freeman et al, 2001) and one study suggesting that citalopram might work in cases resistant to other SSRIs (Freeman et al, 2002b). Buspirone is of doubtful efficacy in premenstrual irritability and nefazodone appears to be inefficacious (Landen et al, 2001). Fluoxetine has been found to alter the duration of the menstrual cycle, either shortening or lengthening cycles (Steiner et al, 1997) (a proprietary herbal remedy has also been found to shorten cycle length: see below). The significance of this and the mechanisms involved are not known.
Symptoms will return in the first cycle after SSRI therapy is discontinued, but there are no long-term safety profile data available for premenstrual syndrome beyond 12 months. Advice to women must therefore be based on the safety profile of SSRIs in the long-term management of unipolar depression.
Comorbidity
Women with mood disorders (unipolar or bipolar) or anxiety disorders may experience significant mood changes in the premenstrual period. Titrating the dose of existing medication up at that time and reducing to a baseline level once menses have occurred is a possible strategy. This might also be a useful approach for women with premenstrual syndrome or premenstrual dysphoric disorder and comorbid mood or anxiety disorders, who need to stay on medication but find the addition of premenstrual symptoms problematic.
Natural remedies
Many women have concerns about taking anti-depressants, often believing them to be addictive. They may fail to start taking them or stop prematurely. Sometimes this is because of side-effects (mostly sexual dysfunction), but many also cite a wish to deal with problems naturally and are increasingly using complementary or alternative therapies to manage premenstrual syndrome. The evidence to support their efficacy is, as yet, very limited. Stevinson & Ernst (2001) undertook a systematic review of complementary and alternative therapies. The poor methodology of some of the studies they identified posed problems and many could not be included in the review. They had to conclude that such therapies are of doubtful efficacy. Similar difficulties beset a meta-analysis of bright-light therapy (Krasnik et al, 2005). Extract of the berries of the shrub Vitex agnus-castus (agnus castus) has been shown to be as efficacious as fluoxetine in treating overall symptoms of premenstrual dysphoric disorder, with fluoxetine being superior for psychological symptoms and agnus castus for physical symptoms (Atmaca et al, 2003). There is also RCT evidence supporting calcium supplementation. Other interventions, such as exercise, other herbal medicines and mindbody approaches, are supported by some evidence. For a comprehensive review of complementary and alternative therapies for premenstrual syndrome see Girman et al(2003). As mentioned above, a proprietary herbal remedy containing pollen extract, pollen and pistil) can shorten cycle length (Winther & Hedman, 2002).
Evening primrose oil (Budeiri et al, 1996) is efficacious for premenstrual mastalgia but not for premenstrual syndrome in general. Luteal phase danazol is also efficacious for premenstrual mastalgia but not for other premenstrual symptoms.
Suppression of ovulation
Systematic reviews have shown progesterone and progestogens to be efficacious (Wyatt et al, 2001) in treating premenstrual symptoms. Oral contraceptives can improve, aggravate or have no effect on them and it is difficult to predict the response. Oral contraceptives do, however, suppress ovulation. Monophasic pills are probably more efficacious than biphasic or triphasic formulations, which may create an artificial cycle and provoke symptoms similar to those of premenstrual syndrome. They can be worth trying in a woman who has not had problems with them previously, particularly if she has irregular cycles that she wishes to regulate (after pathology has been excluded) and needs contraception. Several studies have shown a new oral contraceptive that contains drospirenone and ethinylestradiol to be efficacious in treating premenstrual symptoms, including premenstrual dysphoric disorder.
The suppression of ovulation, for example by using gonadotrophin-releasing hormone analogues (GnRHa), is an efficacious means of abolishing pre-menstrual syndrome (Wyatt et al, 2004), but has been limited to more severely affected women because of the problems caused by add-back hormone replacement therapy (HRT). This is used to control menopausal symptoms resulting from down-regulation and to prevent reduction in bone density but some women find that HRT recreates cyclical premenstrual syndrome-like symptoms. The use of GnRHa with tibolone (a synthetic compound structurally related to noretinodel, which has weak oestrogenic, progestogenic and androgenic properties) may now be a way around this problem.
Psychological interventions
Earlier studies (e.g. Christensen & Oei, 1995; Blake et al, 1998) have shown cognitive therapy to be an efficacious intervention for premenstrual syndrome and superior to information-focused therapy and group awareness. Coping-skills training is superior to relaxation training. More recently, an RCT has compared cognitivebehavioural therapy (CBT) with fluoxetine and a combination of the two (Hunter et al, 2002). Both CBT and fluoxetine were efficacious on their own, and combining them conferred no additional benefit. As might be expected, fluoxetine had a more rapid onset of action, but at the 1-year follow-up CBT was found to be superior. Other strategies, such as support groups, have a very limited evidence base. There is a wide range of self-help books of variable quality that women may find helpful and organisations such as the National Association for Premenstrual Syndrome (Box 2
) provide information and support.
| Box 2 The National Association for Pre-menstrual Syndrome The NAPS provides reliable information from clinicians and expert patients, and raises awareness. Services include:
Helpline 0870 777 2178 (from within UK) +44 (0) 1622 872578 (international) Website http://www.pms.org.uk Email contact{at}pms.org.uk Address 41 Old Road, East Peckham, Kent TN12 2178, UK
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Ignoring the evidence base
Studies in both the USA and UK have shown a disparity between the evidence base and what is being prescribed by clinicians. Anecdotal reports from patients indicate that they are often prescribed drugs that do not appear to be effective. A doctor writing in a well-respected womens magazine recently responded to a reader who wrote enquiring about treatments for her premenstrual syndrome by saying that there was very little that would help and recommending drugs now known to be ineffective. Progestogens and progesterone were still the most commonly prescribed drugs in primary care in the 1990s, although the number of prescriptions for SSRIs was increasing (Wyatt et al, 2002).
| The psychiatrists role |
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| Declaration of interest |
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| MCQs |
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MCQ answers
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| Footnotes |
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| References |
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*Chrisler, J. C. & Caplan, P. (2002) The strange case of Dr. Jekyll and Ms. Hyde: how PMS became a cultural phenomenon and a psychiatric disorder. Annual Review of Sex Research, 13, 274306.[Medline]
Christensen, A. P. & Oei, T. P. S. (1995) The efficacy of cognitive behaviour therapy in treating premenstrual dysphoric changes. Journal of Affective Disorders, 33, 5763.[CrossRef][Medline]
Cohen, L. S., Soares, C. N., Otto, M. W., et al (2002) Prevalence and predictors of premenstrual dysphoric disorder (PMDD) in older premenopausal women. The Harvard Study of Moods and Cycles. Journal of Affective Disorders, 70, 125132.[CrossRef][Medline]
Connolly, M. (2001) Premenstrual syndrome: an update on definitions, diagnosis and management. Advances in Psychiatric Treatment, 7, 469476.
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Epperson, C. N., Haga, K., Mason, G. F., et al (2002) Cortical gamma-aminobutyric acid levels across the menstrual cycle in healthy women and those with premenstrual dysphoric disorder: a proton magnetic resonance spectroscopy study. Archives of General Psychiatry, 59, 851858.
Freeman, E. W., Rickels, K., Yonkers, K. A., et al (2001) Venlafaxine in the treatment of premenstrual dysphoric disorder. Obstetrics and Gynecology, 98, 737744.
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*Halbreich, U. (2003) The etiology, biology, and evolving pathology of premenstrual syndromes. Psychoneuroendocrinology, 28, s1s99.
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*Haywood, A., Slade, P. & King, H (2002) Assessing the assessment measures for menstrual cycle symptoms: a guide for researchers and clinicians. Journal of Psychosomatic Research, 52, 223237.[CrossRef][Medline]
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Krasnik, C., Montori, V. M, Guyatt, G.H et al (2005) The effect of bright light therapy on depression associated with premenstrual dysphoric disorder. American Journal of Obstetrics and Gynecology, 193, 658661.[CrossRef][Medline]
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Wyatt, K. M., Dimmock, P. W., Ismail, K. M. K., et al (2004) The effectiveness of GnRHa with and without add-back therapy in treating premenstrual syndrome: a meta analysis. British Journal of Obstetrics and Gynaecology, 111, 585593.
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