A six-year evaluation of methadone prescribing practices at a substance misuse treatment centre in the UK.

OBJECTIVES: To document changes in prescribing practice at a specialized substance misuse service in the UK occurring since the introduction of the 1999 UK National Guidelines on the management of drug misuse, and to explore a possible link between the length of time spent in methadone maintenance therapy (MMT) and the dosage prescribed. METHODS: A retrospective analysis of a computerized prescription database between 1996 and 2002 obtained from Sheffield Care Trust Substance Misuse Service was performed. The relationship between various measures of dosage and the length of time spent in MMT was investigated. RESULTS: In accordance with the 1999 UK National Guidelines, the proportion of injectable methadone prescribed decreased from 22% to 16%. This was offset by an increase in the prescribing of methadone elixir from 74% to 79%. The 'maximum dose' of methadone prescribed correlated significantly with patient retention, explaining 14% of the variation in time spent in MMT. CONCLUSIONS: Our findings indicate that publication of the UK National Guidelines had a measurable effect on prescribing practice at the Service. We found that a higher methadone dose is associated with increased patient retention in MMT. However, as only a maximum of 14% of the variation in the length of stay is related to methadone dose, the importance of other aspects of treatment such as counselling and rehabilitation programmes, should be considered for the successful treatment of opioid abusers.

Comorbidity of substance misuse and mental illness in community mental health and substance misuse services.

BACKGROUND: Improved management of mental illness and substance misuse comorbidity is a National Health Service priority, but little is known about its prevalence and current management. AIMS: To measure the prevalence of comorbidity among patients of community mental health teams (CMHTs) and substance misuse services, and to assess the potential for joint management. METHOD: Cross-sectional prevalence survey in four urban UK centres. RESULTS: Of CMHT patients, 44% (95% CI 38.1-49.9) reported past-year problem drug use and/or harmful alcohol use; 75% (95% CI 68.2-80.2) of drug service and 85% of alcohol service patients (95% CI 74.2-93.1) had a past-year psychiatric disorder. Most comorbidity patients appear ineligible for cross-referral between services. Large proportions are not identified by services and receive no specialist intervention. CONCLUSIONS: Comorbidity is highly prevalent in CMHT, drug and alcohol treatment populations, but may be difficult to manage by cross-referral psychiatric and substance misuse services as currently configured and resourced.

A discordance between cytochrome P450 2D6 genotype and phenotype in patients undergoing methadone maintenance treatment.

AIMS: To assess CYP2D6 activity and genotype in a group of patients undergoing methadone maintenance treatment (MMT). METHODS: Blood samples from 34 MMT patients were genotyped by a polymerase chain reaction-based method, and results were compared with CYP2D6 phenotype (n = 28), as measured by the molar metabolic ratio (MR) of dextromethorphan (DEX)/dextrorphan (DOR) in plasma. RESULTS: Whereas 9% of patients (3/34) were poor metabolizers (PM) by genotype, 57% (16/28) were PM by phenotype (P < 0.005). Eight patients, who were genotypically extensive metabolizers (EM), were assigned as PM by their phenotype. The number of CYP2D6*4 alleles and sex were significant determinants of CYP2D6 activity in MMT patients, whereas other covariates (methadone dose, age, weight) did not contribute to variation in CYP2D6 activity. CONCLUSIONS: There was a discordance between genotype and in vivo CYP2D6 activity in MMT patients. This finding is consistent with inhibition of CYP2D6 activity by methadone and may have implications for the safety and efficacy of other CYP2D6 substrates taken by MMT patients.

Cocaine misuse treatment in England.

Three methods were used to identify the treatments given to cocaine misusers in England, and to make a preliminary assessment of effectiveness. First, a postal survey of all known drug misuse treatment services ascertained approximate numbers of cocaine misusers presenting and receiving a specified range of treatments. Secondly, staff at selected services were interviewed regarding treatment policies, and asked to subjectively rate short-term and long-term effectiveness. Thirdly, a cohort of individuals in treatment were studied prospectively to assess changes in drug usage and associated problems. Fifty percent of services responded to the survey, but there was known to be significant duplication in service listings and it is considered that a representative pattern of clinical activity has been detected. Approximately half those services had recently treated cocaine misusers, mainly using counselling, residential rehabilitation, and pharmacological treatments, in which 32 different medications were identified. Acupuncture was prominent in a minority of services. Staff interviews suggested several principles in managing cocaine misusers, while all treatments were rated as being more effective in short-term relief of withdrawal features than in enabling longer-term abstinence. The treatment cohort were mostly in residential rehabilitation, and marked reductions in drug use and related clinical and social problems were demonstrated.

Longitudinal study of the influence of life events and personality status on diagnostic change in three neurotic disorders.

It has been known for many years that diagnosis within the neurotic spectrum of disorders is temporally unstable and also that life events can be major precipitants of change in symptoms. Reasons for this instability could include inherent inadequacy of current diagnostic practice, the influence of life events as an agent of diagnostic shift, and an innate course of disorder with features dependent on the stage at which disorder presents (e.g., development of panic to agoraphobia). These possibilities were examined in a prospective study that was initially a randomised controlled trial. Two hundred ten patients recruited from primary care psychiatric clinics with DSM-III diagnosed dysthymic, generalised anxiety, and panic disorders were randomly allocated to either drug treatment (mainly antidepressants), cognitive-behaviour therapy, or self-help therapy over a 2 year period, irrespective of original diagnosis. Life events were recorded by using a standard procedure over the period 6 months before starting treatment and at five occasions over 2 years; 181 (86%) of the patients had follow-up data and 76% maintained compliance with the original treatment allocated over the 2 years; and 155 of the 181 patients (86%) had at least one diagnostic change in this period. There was no difference in the number of diagnostic changes between the three original diagnostic groups, but dysthymic disorder changed more frequently to major depressive episode than did GAD or panic disorder (20; 11; 12) (%) and panic disorder changed more frequently to agoraphobia (with or without panic) than did dysthymia or GAD (18; 8; 6) (%). There was no relationship between loss events and depressive diagnoses or between addition events and anxiety diagnoses, but greater numbers of conflict events were associated with diagnostic change. More life events were associated with the flamboyant and dependent personality disorders, reinforcing other evidence that many life events are internally generated by personality characteristics and cannot be regarded as truly independent.

Can methadone maintenance for heroin-dependent patients retained in general practice reduce criminal conviction rates and time spent in prison?

A retrospective analysis was made of the criminal records of 57 patients successfully retained in methadone maintenance at two general practices in Sheffield. Their criminal conviction rates and time spent in prison per year were compared for the periods before and after the start of their methadone programme. Overall, patients retained on methadone programmes in the general practices studied had significantly fewer convictions and cautions, and spent significantly less time in prison than they had before the start of treatment.

Long-term outcome of hypochondriacal personality disorder.

Hypochondriacal personality disorder diagnosed according to the Personality Assessment Schedule, a structured clinical interview, was related to outcome after 2 years and 5 years in a randomized, controlled trial of treatment of generalized anxiety, panic, and dysthymic disorders. Seventeen individuals (9%) from a population of 181 patients had hypochondriacal personality disorder and they experienced a significantly worse outcome than other patients, including those with other personality disorders, in terms of symptomatic change and health service utilization. This lack of improvement was associated with persistent somatization in hypochondriacal personality disorder. The results give further support to the belief that hypochondriacal personality disorder is a valid clinical diagnosis that has important clinical correlates, but further work is needed to establish the extent of its overlap with hypochondriasis as a mental state disorder.

Personality disorder and drug use: a review.

The concept of personality disorder (PD) is more relevant in the clinical management of drug users than other approaches to personality assessment. A problem in diagnosis is separating behaviours inherent in the activity of drug misuse from true evidence of PD, especially the anti-social type (ASPD), and rating instruments vary in their ability to do this. Nevertheless, the available evidence suggests that approximately two-thirds of drug users in treatment have PD, with ASPD the most common. Studies have mainly been in opiate users, while the prevalence of PD may be lower across the range of drugs, and in non-treatment settings. PD has been found to be associated with a range of complications and adverse outcomes in drug use, including psychiatric problems, poor social functioning, dropout from treatment, and increased HIV risk behaviours and infection rates. Outcomes for ASPD individuals in methadone maintenance treatment appear reasonable, however, and it may be that early recourse to such treatment is the most practical option for many PD opiate users, a potential criticism being that this does not directly address the PD problems.

The Nottingham Study of Neurotic Disorder: influence of cognitive therapists on outcome.

BACKGROUND: In previously published papers from the Nottingham Study of Neurotic Disorder a short treatment package of cognitive-behaviour therapy was no more effective than placebo drug treatment after 10 weeks' assessment in a cohort of 210 patients with neurotic disorders. This paper examines the outcome over two years of the patients treated by cognitive-behaviour therapy separated into two therapist groups, those who were competent in administering treatment and those of uncertain competence. METHOD: The therapists (mainly community psychiatric nurses) of 70 patients with an original DSM-III diagnosis of either dysthymic, panic or generalised anxiety disorder were separated into two groups on the basis of their perceived competence by their supervisor (DK). Ratings of psychopathology were made at regular intervals over two years by assessors blind to knowledge of treatment or therapist. RESULTS: The patients treated by competent therapists (n = 30) generally showed greater improvement than those allocated to therapists of uncertain competence (n = 40), mainly with respect to depressive symptoms, and the difference persisted over two years, long after the cognitive-behaviour therapy had been completed. CONCLUSIONS: Cognitive-behaviour therapy given by competent therapists over a 10 week period is of lasting benefit in neurotic disorder.

Withdrawal symptoms from high dose benzodiazepines in poly drug users.

Among poly drug users attending a treatment service, 33 subjects were identified who had experienced withdrawal symptoms from high dose benzodiazepines (median diazepam equivalent 140 mg/day) at a time uncomplicated by simultaneous cessation of other drugs. Symptoms were rated using the Benzodiazepine Withdrawal Symptom Questionnaire (Tyrer et al. (1990) The Benzodiazepine Withdrawal Symptom Questionnaire. J. Affective Disorders, 19, 53-61). The symptoms experienced were similar to those described in studies of withdrawal from low dose benzodiazepines, but more severe. Greater severity of symptoms was significantly associated with high dosage, the use of multiple benzodiazepines and oral rather than injected use. The implications for clinical management are discussed.

The Nottingham study of neurotic disorder. Effect of personality status on response to drug treatment, cognitive therapy and self-help over two years.

Repeated assessments of psychopathology, together with personality status, were made over two years on 181 psychiatric out-patients with generalised anxiety disorder (59), panic disorder (66), or dysthymic disorder (56) diagnosed using an interview schedule for DSM-III. Patients were randomly allocated to drug treatment, cognitive and behaviour therapy, or a self-help treatment programme. Although there were no overall differences in compliance rate and efficacy between the three modes of treatment, the psychological treatment methods, particularly self-help, were more effective in patients without personality disorder, and those with personality disorder responded better to drug treatment, primarily antidepressants. The findings suggest that assessment of personality status could be a valuable aid to selection of treatment in neurotic disorders and that self-help approaches are particularly valuable once personality disorder has been excluded.

The general neurotic syndrome: a coaxial diagnosis of anxiety, depression and personality disorder.

The validity of the general neurotic syndrome, a combination of anxiety, depression and dependent personality disorder, was examined in a 2-year study of outpatients with dysthymic, panic and generalized anxiety disorder diagnosed using a structured interview schedule. The general neurotic syndrome, found in a third of the patients, was associated with greater mental disorder and a significantly worse outcome than patients without the syndrome. It did not, however, predict response to treatment. Further analysis revealed that the general neurotic syndrome was a better predictor of short- and long-term outcome than any other variable apart from initial psychopathology score. It is argued that the syndrome may represent a personality diathesis that makes the individual more vulnerable to both anxiety and depressive symptoms.