Self-poisoning with medications in adolescents: a national register study of hospital admissions and readmissions

Gender-specific pathways in mental health crisis in adolescents, from consultation to (in)voluntary admission: a retrospective study

BACKGROUND

A strong increase in mental health emergency consultations and admissions in youths has been reported in recent years. Although empirical evidence is lacking, gender differences in risk of admission may have contributed to this increase. A clearer understanding of the relationship, if any, between gender and various aspects of (in)voluntary care would help in more evidence-based service planning.

METHODS

We analysed registry data for 2008-2017 on 3770 outpatient emergencies involving young people aged 12 to 18 years from one urban area in the Netherlands, served by outreaching psychiatric emergency services. These adolescents were seen in multiple locations and received a psychosocial assessment including a questionnaire on the severity of their problems and living conditions. Our aims were to (a) investigate the different locations, previous use of mental health service, DSM classifications, severity items, living conditions and family characteristics involved and (b) identify which of these characteristics in particular contribute to an increased risk of admission.

RESULTS

In 3770 consultations (concerning 2670 individuals), more girls (58%) were seen than boys. Boys and girls presented mainly with relationship problems, followed by disruptive disorders and internalizing disorders. Diagnostic differences diminished in hospitalisation. More specifically, disruptive disorders were evenly distributed. Suicide risk was rated significantly higher in girls, danger to others significantly higher in boys. More girls than boys had recently been in mental health care prior to admission. Although boys and girls overall did not differ in the severity of their problems, female gender predicted admission more strongly. In both boys and girls severity of problems and lack of involvement of the family significantly predicted admission. Older age and danger to others significantly predicted admission among boys, whereas psychosis, suicidality and poor motivation for treatment predicted admission among girls.

CONCLUSION

There are different pathways for youth admission, which can partly be explained by different psychiatric classifications as well as gender-specific differences with regard to age, suicide risk, danger to others and the influence of motivation for treatment. Finally, for both genders, family desire for hospitalisation is also an important predictor.

Risk factors for deliberate self-poisoning among children and adolescents in The Netherlands

INTRODUCTION

In the past decade, the number of deliberate self-poisonings involving young people has increased strongly worldwide. This study aimed to gain insight into risk factors associated with deliberate self-poisonings among children and adolescents reported to the Dutch Poisons Information Center.

METHODS

A study was performed between 1 February 2022 and 31 January 2023 involving those aged 8-17 years of age with deliberate self-poisoning. Data were collected on patient characteristics (age, gender, body mass index and living situation) and exposure characteristics (type of toxicant, way of acquiring toxicant and day of exposure).

RESULTS

The Dutch Poisons Information Center was consulted about 1,424 deliberate self-poisonings among children and adolescents (10-17 years old). A high percentage of patients were female (85 percent), had a body mass index classified as overweight/obese (27 percent) and lived in a mental healthcare facility (13 percent). Patients mainly exposed themselves to pharmaceuticals, especially over-the-counter medications such as paracetamol (46 percent) and ibuprofen (15 percent). Young people living with parents/caregivers had higher odds of ingesting prescription pharmaceuticals or over-the-counter medication, while those living in a mental healthcare facility were more likely to ingest household products, personal care products or foreign bodies (predominantly batteries).

DISCUSSION

This study sheds light on the pervasive issue of deliberate self-poisoning among children and adolescents, advocating for poisoning prevention strategies and promoting mental health of youth. Limitations include reliance on self-reported data from patients and the absence of clinical outcome data.

CONCLUSIONS

Female gender, a high body mass index and living in a mental healthcare facility are associated with in increased risk of deliberate self-poisonings in children and adolescents (10-17 years old). Prevention of deliberate self-poisonings among youth could focus on restricting access to medication and other potentially hazardous non-pharmaceuticals, such as household products and batteries, as well as limiting the sales of over-the-counter medication, especially paracetamol, to this young population.

Readmission of adolescent psychiatric patients to a specialised unit in Gauteng, South Africa

Background

Readmission rates to child and adolescent psychiatric units among the youth have been reported to be increasing.

Aim

The study aimed to determine the readmission rate and factors associated with readmission of adolescent psychiatric patients at a child and adolescent psychiatric unit.

Setting

A specialised psychiatric hospital in Gauteng province, South Africa.

Methods

This retrospective cohort study utilised data from the records of patients admitted to the adolescent inpatient unit over a period of five years. The cumulative incidence and incidence rate of readmission within one year of discharge from the index admission was calculated using survival analysis methods. Characteristics significantly associated with readmission were determined by applying the multivariable Cox proportional hazards regression model.

Results

Among the 189 patients included in the analysis, the cumulative incidence of readmission within one year of discharge was 17.5%. The incidence rate was 5.31 readmissions per 10 000 person-days. The final multivariable model showed that a diagnosis of schizophrenia (p = 0.015), a diagnosis of attention deficit hyperactivity disorder (p = 0.039), and coming from a child and youth care centre or temporary safe care (p = 0.018) increased the risk of readmission while having a medical condition (p = 0.008) reduced the risk.

Conclusion

Psychiatric diagnosis and residential care could be potential risk markers for readmission. Improving the collaboration between health and social services in residential care would be beneficial.

Contribution

Identifying factors that predispose adolescent psychiatric patients to readmission can inform and improve management and risk assessments.

Prevalence of Depression and Predictors of Discharge to a Psychiatric Hospital in Young People with Hospital-Treated Deliberate Self-Poisoning at an Australian Sentinel Unit

OBJECTIVE

Hospital treated deliberate self-poisoning is common in young people. Internationally, estimates of rates of depression in this population are very wide (14.6% to 88%). The aims of this study were to determine the prevalence of depression and the independent predictors of referral for psychiatric hospitalisation in young people (aged 16 to 25 years) following an index episode of hospital treated deliberate self-poisoning.

METHOD

A retrospective cohort study design (n = 1410), with data drawn from a population-based clinical case register. Unadjusted and adjusted estimates of predictors of referral for psychiatric admission (after-care) used logistic regression models.

RESULTS

Prevalence of any depression diagnosis was 35.5% (n = 500); and 25.4% (n = 358) were referred for a psychiatric admission. The adjusted estimates for predictors of psychiatric inpatient referral were: high suicidal level (OR 118.21: CI 95% 63.23-220.99), low/moderate suicidal level (14.27: 9.38-21.72), any depression (2.88: 1.97-4.22), any psychosis (4.06; 1.15-14.36), older age (1.12: 1.04-1.21), and number of support people (0.88: 0.78-0.98).

CONCLUSION

Depression was diagnosed in more than a third and was an independent predictor of psychiatric inpatient referral, so service providers need to account for this level of need in the provision of assessment and after-care services. Evidence-based guidelines for psychiatric inpatient after-care for deliberate self-poisoning and/or depression in young people are limited. Our explanatory model included suicidal level, depression, psychosis, older age, and available support persons, suggesting that the treating clinicians were making these discharge decisions for admission in keeping with those limited guidelines, although the balance of benefits and harms of psychiatric hospitalisation are not established. Future research examining patient experiences, effectiveness of psychiatric hospitalisation, and alternatives to hospitalisation is warranted.

Risk factors for nonfatal self-harm and suicide among adolescents: two nested case-control studies conducted in the UK Clinical Practice Research Datalink

BACKGROUND

The characteristics of adolescents who die by suicide have hitherto been examined in uncontrolled study designs, thereby precluding examination of risk factors. The degree to which antecedents of nonfatal self-harm and suicide at young age differ remains unknown.

METHOD

We delineated two nested case-control studies of patients aged 10-19 years using the Clinical Practice Research Datalink with interlinked hospital and national mortality records. Cases were adolescents who between 1st January 2003 and 31st December 2018 had died from suicide (N = 324) - study 1; experienced their first self-harm episode (N = 56,008) - study 2. In both studies, cases were matched on sex, age and practice-level deprivation quintile to 25 controls. By fitting conditional logistic regression, we examined how risks varied according to psychiatric diagnoses, prescribed psychotropic medication, patterns of clinical contact and area-level deprivation.

RESULTS

Suicides occurred more often among boys (66%), but self-harm was more common in girls (68%). Most individuals who self-harmed or died from suicide presented to their GP at least once in the preceding year (85% and 75% respectively). Only a third of cases had one of the examined diagnostic categories recorded. Depression was most strongly associated with elevated risks for both outcomes (self-harm: OR 7.9; 95% CI 7.8-8.2; suicide: OR 7.4; 95% CI 5.5-9.9). Except for autism spectrum disorder, all other diagnostic categories were linked with similar risk elevations for self-harm as for suicide. Whilst self-harm risk rose incrementally with increasing levels of area-level deprivation, suicide risks did not.

CONCLUSIONS

We observed few marked differences in risk factor profiles for nonfatal self-harm versus suicide. As most adolescents who had harmed themselves or died by suicide were known to services in the preceding year, their underlying pathology may not be adequately identified and treated. Our findings highlight the need for a multiagency approach to treatment and prevention.

Intentional Poisoning in Pediatric Patients: Examining the Risk Factors

OBJECTIVES

Poisonings in children are common reasons for presentation to the emergency department and can potentially have serious complications. Our research aims to review risk factors leading to intentional self-poisoning.

METHODS

A retrospective medical record review of all intentional pediatric poisoning cases presenting to the Children's Emergency at National University Hospital, Singapore between January 2014 and December 2015 was performed.

RESULTS

Eighty-seven cases of intentional poisonings were identified, 31 (36.5%) of which were with suicidal intent. The majority of cases were female (85.1%) and adolescents older than 16 years (93.1%). A known psychiatric history was present in 57.5% and 62 (71.3%) had a history of deliberate self-harm. Being diagnosed with a new psychiatric illness during that presentation was associated with a history of self-harm (adjusted odds ratio [Adj OR], 6.74; 95% confidence interval [CI]; 1.04-43.62; P = 0.045). Twenty-seven (31.0%) patients had a history of intentional poisoning, and 15 (17.2%) went on to have subsequent presentations for poisoning. Recurrent poisoning attempts were strongly associated with a known psychiatric history (Adj OR, 5.91; 95% CI, 1.62-21.58; P = 0.007) and a history of deliberate self-harm (Adj OR, 7.49; 95% CI, 1.38-40.66; P = 0.02). Deliberate overdosing on personal long-term medication was seen in 15 (35.7%) of 42, of which 12 (80%) of 15 were psychiatric medications.

CONCLUSIONS

Known psychiatric history or a history of deliberate self-harm are risk factors for intentional poisoning. Appropriate risk stratification and preemptive interventions involving closer surveillance or cognitive behavioral programs are possible measures to prevent intentional self-poisoning, especially in these at-risk groups.

Social and life skills in adolescents who have self-harmed: analysis of survey responses from a national sample of adolescents in Norway

OBJECTIVE

Social and life skills (SLS) may be important in the prevention and treatment of self-harm, but few studies have described this relationship. We examined three components of SLS in adolescents who reported self-harm that was, according to themselves, diagnosed by a clinician.

DESIGN

Cross-sectional.

SETTING

National screening prior to military service.

PARTICIPANTS

176 284 residents of Norway born in 1999-2001 received a declaration of health. We included 171 486 individuals (84 153 (49%) women and 87 333 (51%) men) who were 17 (n=1 67 855) or 18 years of age (n=3631) when they completed the declaration.

OUTCOME MEASURE

The main outcome was clinically diagnosed self-harm, defined as self-harm that the adolescents themselves stated had been diagnosed by a clinician. Components of SLS were social interactions; coping strategies; and emotional regulation/aggression. The association between SLS and self-reported clinically diagnosed self-harm was assessed in hierarchical multiple regression models controlling for sex; school absence; and feelings of emotional pain.

RESULTS

Three percent (n=5507) of the adolescents reported clinically diagnosed self-harm. The three components of SLS together added little to the prediction of clinically diagnosed self-harm (∆R²=0.02). After controlling for school absence and emotional pain, emotional regulation/aggression was the only SLS-component that was independently associated with clinically diagnosed self-harm (OR 1.33, 95% CI 1.31 to 1.36). The young men who said they had been clinically diagnosed for self-harm scored slightly worse on social interactions (Hedge's g (g) = -0.13, p<0.001) and emotional regulation/aggression (g = -0.18, p<0.001) than the young women in this group.

CONCLUSION

Young women and young men who reported clinically diagnosed self-harm had more problems with emotional regulation/aggression than other adolescents, but did not have worse social interactions or coping strategies.

Risk Factors for Revolving Door in Children and Adolescents with Psychiatric Disorders

Revolving Door (RD) is a frequent phenomenon afflicting children and adolescents with psychiatric diagnoses. Nevertheless, risk factors for RD are still a matter of debate. To better understand RD phenomenon, we conducted a retrospective study on 224 children and adolescents (165 females and 59 males, aged 6-16 years) with a psychiatric hospitalization, taking the multiple risk factors together. At this aim, 108 patients with multiple hospitalizations and 116 patients with only one hospitalization were compared on demographic characteristics, clinical conditions, psychiatric ward stay, and post-discharge management factors. More than half of psychiatric patients were readmitted within three months of discharge. RD patients presented greater severity of illness, needed longer stays, and were more frequently placed in residential facilities than non-RD patients. Non-suicidal self-injurious and adoption were the main predictors of RD. Clinical instruments that detected behavioural and emotional symptoms, suicidal ideation severity, and level of impairment of the person's functioning were useful to identify patients at high risk for RD. In conclusion, our findings pointed out that several risk factors have to be considered to better understand and, in the future, prevent RD phenomenon.

Psychiatric Readmission of Children and Adolescents: A Systematic Review and Meta-Analysis

OBJECTIVE

To investigate predictors of psychiatric hospital readmission of children and adolescents, a systematic review and meta-analysis was conducted.

METHODS

Following PRISMA statement guidelines, a systematic literature search of articles published between 1997 and 2018 was conducted in PubMed/MEDLINE, Google Scholar, and PsycINFO for original peer-reviewed articles investigating predictors of psychiatric hospital readmission among youths (<18 years old). Effect sizes were extracted and combined by using random-effects meta-analysis. Covariates were investigated with meta-regression and subgroup analyses.

RESULTS

Thirty-three studies met inclusion criteria, containing information on 83,361 children and adolescents, of which raw counts of readmitted vs. non-readmitted youths were available for 76,219. Of these youths, 13.2% (N=10,076) were readmitted. The mean±SD study follow-up was 15.9±15.0 months, and time to readmission was 13.1±12.8 months. Readmission was associated with, but not limited to, suicidal ideation at index hospitalization (pooled odds ratio [OR_pooled]=2.35, 95% confidence interval [CI]=1.64-3.37), psychotic disorders (OR_pooled=1.87, 95% CI=1.53-2.28), prior hospitalization (OR_pooled=2.51, 95% CI=1.76-3.57), and discharge to residential treatment (OR_pooled=1.84, 95% CI=1.07-3.16). There was evidence of moderate study bias. Prior investigations were methodologically and substantively heterogeneous, particularly for measurement of family-level factors.

CONCLUSIONS

Interventions to reduce child psychiatric readmissions should place priority on youths with indicators of high clinical severity, particularly with a history of suicidality, psychiatric comorbidity, prior hospitalization, and discharge to residential treatment. Standardization of methods to determine prevalence rates of readmissions and their predictors is needed to mitigate potential biases and inform a national strategy to reduce repeated child psychiatric hospital readmissions.

Risk factors associated with paediatric unplanned hospital readmissions: a systematic review

OBJECTIVE

To synthesise evidence on risk factors associated with paediatric unplanned hospital readmissions (UHRs).

DESIGN

Systematic review.

DATA SOURCE

CINAHL, EMBASE (Ovid) and MEDLINE from 2000 to 2017.

ELIGIBILITY CRITERIA

Studies published in English with full-text access and focused on paediatric All-cause, Surgical procedure and General medical condition related UHRs were included.

DATA EXTRACTION AND SYNTHESIS

Characteristics of the included studies, examined variables and the statistically significant risk factors were extracted. Two reviewers independently assessed study quality based on six domains of potential bias. Pooling of extracted risk factors was not permitted due to heterogeneity of the included studies. Data were synthesised using content analysis and presented in narrative form.

RESULTS

Thirty-six significant risk factors were extracted from the 44 included studies and presented under three health condition groupings. For All-cause UHRs, ethnicity, comorbidity and type of health insurance were the most frequently cited factors. For Surgical procedure related UHRs, specific surgical procedures, comorbidity, length of stay (LOS), age, the American Society of Anaesthesiologists class, postoperative complications, duration of procedure, type of health insurance and illness severity were cited more frequently. The four most cited risk factors associated with General medical condition related UHRs were comorbidity, age, health service usage prior to the index admission and LOS.

CONCLUSIONS

This systematic review acknowledges the complexity of readmission risk prediction in paediatric populations. This review identified four risk factors across all three health condition groupings, namely comorbidity; public health insurance; longer LOS and patients<12 months or between 13-18 years. The identification of risk factors, however, depended on the variables examined by each of the included studies. Consideration should be taken into account when generalising reported risk factors to other institutions. This review highlights the need to develop a standardised set of measures to capture key hospital discharge variables that predict unplanned readmission among paediatric patients.

Readmissions after Pediatric Hospitalization for Suicide Ideation and Suicide Attempt

OBJECTIVE

To inform resource allocation toward a continuum of care for youth at risk of suicide, we examined unplanned 30-day readmissions after pediatric hospitalization for either suicide ideation (SI) or suicide attempt (SA).

METHODS

We conducted a retrospective cohort study of a nationally representative sample of 133,516 hospitalizations for SI or SA among 6- to 17-year-olds to determine prevalence, risk factors, and characteristics of 30-day readmissions using the 2013 and 2014 Nationwide Readmissions Dataset (NRD). Risk factors for readmission were modeled using logistic regression.

RESULTS

We identified 95,354 hospitalizations for SI and 38,162 hospitalizations for SA. Readmission rates within 30 days were 8.5% for SI and SA hospitalizations. Among 30-day readmissions, more than one-third (34.1%) occurred within 7 days. Among patients with any 30-day readmission, 11% had more than one readmission within 30 days. The strongest risk factors for readmission were SI or SA hospitalization in the 30 days preceding the index SI/SA hospitalization (adjusted odds ratio [AOR]: 3.14, 95% CI: 2.73-3.61) and hospitalization for other indications in the previous 30 days (AOR: 3.18, 95% CI: 2.67-3.78). Among readmissions, 94.5% were for a psychiatric condition and 63.4% had a diagnosis of SI or SA.

CONCLUSIONS

Quality improvement interventions to reduce unplanned 30-day readmissions among children hospitalized for SI or SA should focus on children with a recent prior hospitalization and should be targeted to the first week following hospital discharge.

FUNDING

Dr. Zima received funding from the Behavioral Health Centers of Excellence for California (SB852).

Injuries prior and subsequent to index poisoning with medication among adolescents: a national study based on Norwegian patient registry

BACKGROUND

Adolescents treated for self-poisoning with medication have a high prevalence of mental health problems and constitute a high-risk population for self-harm repetition. However, little is known about whether this population is also prone to injuries of other forms.

METHODS

Data were extracted from the Norwegian Patient Registry to include all incidents of treated injuries in adolescents aged 10-19 years who were treated for self-poisoning with medication during 2008-2011. This longitudinal approach allowed for the inclusion of injuries of various forms both before and after the index poisoning with medication. Gender differences and associations of injuries with recorded deliberate self-harm or psychiatric comorbidity at index poisoning were analysed. Forms of injury and psychiatric illnesses were coded according to the ICD-10 system.

RESULTS

1497 adolescents treated for self-poisoning with medication were identified from the source database, including 1144 (76.4%) girls and 353 (23.6%) boys. For these 1497 adolescents a total of 2545 injury incidents were recorded in addition to the index poisoning incidents, consisting of 778 injury incidents taking place before the index poisoning and 1767 incidents taking place subsequently. Altogether 830 subjects (55.4%) had an injury treated either before or after the index poisoning. Injuries to the hand and wrist as well as injuries to the head, neck and throat were predominant in males. Females were more likely to repeat poisoning with medication, particularly those with psychiatric disorders.

CONCLUSION

Adolescents treated for poisoning with medication represent a high-risk population prone to both prior and subsequent injuries of other forms, and should be assessed for suicidal intent and psychiatric illness.

Role of antidepressants in the treatment of adults with anorexia nervosa

Introduction:

Anorexia nervosa (AN) is a severe psychiatric disorder that is difficult to treat and is associated with frequent relapses and high mortality rates. Psychiatric symptomatology (eg, depression, anxiety, obsessive-compulsive disorder/behaviors) are common comorbidities. This review provides current information about safety and efficacy of antidepressant therapy for management of AN in adults.

Methods:

A literature review of randomized controlled trials, open-label studies, and case reports with adults or adults/adolescents was conducted. PubMed and Medline were searched using anorexia management and treatment, antidepressants, selective serotonin reuptake inhibitors (SSRIs), fluoxetine, sertraline, citalopram, and mirtazapine in AN, relapse prevention in AN, and psychotropic medications in AN.

Results:

The role and utility of antidepressants in AN were published in double-blind, placebo-controlled studies; open-label trials; and a retrospective study. Antidepressants should not be used as sole therapy for AN although their use for confounding symptomatology makes discerning efficacy difficult as they are given together with other therapies. Neurobiological changes due to starvation and AN itself complicate results interpretation. For safety, tricyclic antidepressants and monoamine oxidase inhibitors are not recommended, and bupropion is contraindicated. Use of SSRIs during acute treatment lacks efficacy. Use of SSRIs—primarily fluoxetine and to some extent citalopram, sertraline, or mirtazapine—may aid in relapse prevention and improvement of psychiatric symptomatology in weight-restored anorexic patients.

Discussion:

Health care professionals should use clinical judgment regarding fluoxetine or possibly citalopram, sertraline or mirtazapine as adjunctive treatment to psychotherapy for relapse prevention, improvement of depressive and anxiety symptoms, and/or obsessive-compulsive behaviors unresolved with nutritional rehabilitation and psychotherapy.

The quality of severe mental disorder diagnoses in a national health registry as compared to research diagnoses based on structured interview

BACKGROUND

Utilization of diagnostic information from national patient registries rests on the quality of the registered diagnoses. We aimed to investigate the agreement and consistency of diagnoses of psychotic and bipolar disorders in the Norwegian Patient Registry (NPR) compared to structured interview-based diagnoses given as part of a clinical research project.

METHODS

Diagnostic data from NPR were obtained for the period 01.01.2008-31.12.2013 for all patients who had been included in the Thematically Organized Psychosis (TOP) study between 18.10.2002 and 01.09.2014 with a Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV) diagnosis of schizophrenia (n = 537), delusional disorder (n = 48), schizoaffective disorder (n = 118) or bipolar disorder (n = 408). Diagnostic agreement between the primary DSM-IV diagnosis in TOP and the International Classification of Diseases, 10th revision (ICD-10) diagnoses in NPR was evaluated using Cohen's unweighted nominal kappa (κ). Diagnostic consistency was calculated as the proportion of all registered severe mental disorder diagnoses in NPR that were equivalent to the primary diagnosis given in the TOP study.

RESULTS

The proportion of patients registered with the equivalent ICD-10 diagnosis as the primary DSM-IV diagnosis given in TOP was 84.2% for the schizophrenia group, 68.8% for the delusional disorder group, 76.3% for the schizoaffective disorder group, and 78.4% for the bipolar disorder group. Diagnostic agreement was good for schizophrenia (κ = 0.74) and bipolar disorder (κ = 0.72), fair for schizoaffective disorder (κ = 0.63), and poor for delusional disorder (κ = 0.39). Among patients with DSM-IV schizophrenia, 4.7% were diagnosed with ICD-10 bipolar disorder, and among patients with DSM-IV bipolar disorder, 2.5% were diagnosed with ICD-10 schizophrenia. Diagnostic consistency was 84.9% for schizophrenia, 59.1% for delusional disorder, 65.9% for schizoaffective disorder, and 91.0% for bipolar disorder.

CONCLUSIONS

When compared to research-based diagnoses, clinical diagnoses of schizophrenia and bipolar disorder in the NPR are accurate and consistent, with minimal diagnostic overlap between the two disorders.

Risk of recurrent overdose associated with prescribing patterns of psychotropic medications after nonfatal overdose

OBJECTIVE

We aimed to estimate risk of recurrent overdose associated with psychosocial assessment by psychiatrists during hospitalization for nonfatal overdose and prescribing patterns of psychotropic medications after discharge.

METHODS

A retrospective cohort study was conducted using a nationwide claims database in Japan. We classified patients aged 19-64 years hospitalized for nonfatal overdose between October 2012 and September 2013 into two cohorts: 1) those who had consulted a psychiatrist prior to overdose (n=6,790) and 2) those who had not (n=4,950). All patients were followed up from 90 days before overdose until 365 days after discharge.

RESULTS

Overall, 15.3% of patients with recent psychiatric treatment had a recurrent overdose within 365 days, compared with 6.0% of those without psychiatric treatment. Psychosocial assessment during hospital admission had no significant effect on subsequent overdose, irrespective of treatment by psychiatrists before overdose. There was a dose-response relationship for the association of benzodiazepine prescription after overdose with subsequent overdose in either cohort, even after accounting for average daily dosage of benzodiazepines before overdose and other confounders. In patients with recent psychiatric treatment, the cumulative proportion of recurrent overdose at 365 days was 27.7% for patients receiving excessive dosages of benzodiazepines, 22.0% for those receiving high dosages, 15.3% for those receiving normal dosages, and 7.6% for those receiving no benzodiazepines. In patients without psychiatric treatment, the cumulative proportion of recurrent overdose at 365 days was 24.3% for patients receiving excessive dosages of benzodiazepines, 18.0% for those receiving high dosages, 9.0% for those receiving normal dosages, and 4.1% for those receiving no benzodiazepines.

CONCLUSION

Lower dose of benzodiazepines after overdose is associated with lower risk of subsequent overdose.