Cognitive and clinical predictors of a long-term course in obsessive compulsive disorder: A machine learning approach in a prospective cohort study

BACKGROUND

Obsessive compulsive disorder (OCD) is a disabling illness with a chronic course, yet data on long-term outcomes are scarce. This study aimed to examine the long-term course of OCD in patients treated with different approaches (drugs, psychotherapy, and psychosurgery) and to identify predictors of clinical outcome by machine learning.

METHOD

We included outpatients with OCD treated at our referral unit. Demographic and neuropsychological data were collected at baseline using standardized instruments. Clinical data were collected at baseline, 12 weeks after starting pharmacological treatment prescribed at study inclusion, and after follow-up.

RESULTS

Of the 60 outpatients included, with follow-up data available for 5-17 years (mean = 10.6 years), 40 (67.7 %) were considered non-responders to adequate treatment at the end of the study. The best machine learning model achieved a correlation of 0.63 for predicting the long-term Yale-Brown Obsessive Compulsive Scale (Y-BOCS) score by adding clinical response (to the first pharmacological treatment) to the baseline clinical and neuropsychological characteristics.

LIMITATIONS

Our main limitations were the sample size, modest in the context of traditional ML studies, and the sample composition, more representative of rather severe OCD cases than of patients from the general community.

CONCLUSIONS

Many patients with OCD showed persistent and disabling symptoms at the end of follow-up despite comprehensive treatment that could include medication, psychotherapy, and psychosurgery. Machine learning algorithms can predict the long-term course of OCD using clinical and cognitive information to optimize treatment options.

Tobacco use in first-episode psychosis, a multinational EU-GEI study

BACKGROUND

Tobacco is a highly prevalent substance of abuse in patients with psychosis. Previous studies have reported an association between tobacco use and schizophrenia. The aim of this study was to analyze the relationship between tobacco use and first-episode psychosis (FEP), age at onset of psychosis, and specific diagnosis of psychosis.

METHODS

The sample consisted of 1105 FEP patients and 1355 controls from the European Network of National Schizophrenia Networks Studying Gene-Environment Interactions (EU-GEI) study. We assessed substance use with the Tobacco and Alcohol Questionnaire and performed a series of regression analyses using case-control status, age of onset of psychosis, and diagnosis as outcomes and tobacco use and frequency of tobacco use as predictors. Analyses were adjusted for sociodemographic characteristics, alcohol, and cannabis use.

RESULTS

After controlling for cannabis use, FEP patients were 2.6 times more likely to use tobacco [p ⩽ 0.001; adjusted odds ratio (AOR) 2.6; 95% confidence interval (CI) [2.1-3.2]] and 1.7 times more likely to smoke 20 or more cigarettes a day (p = 0.003; AOR 1.7; 95% CI [1.2-2.4]) than controls. Tobacco use was associated with an earlier age at psychosis onset (β = -2.3; p ⩽ 0.001; 95% CI [-3.7 to -0.9]) and was 1.3 times more frequent in FEP patients with a diagnosis of schizophrenia than in other diagnoses of psychosis (AOR 1.3; 95% CI [1.0-1.8]); however, these results were no longer significant after controlling for cannabis use.

CONCLUSIONS

Tobacco and heavy-tobacco use are associated with increased odds of FEP. These findings further support the relevance of tobacco prevention in young populations.

Neuropsychological performance and predictors of pharmacological treatment response in obsessive compulsive disorder

BACKGROUND

Obsessive Compulsive Disorder (OCD) is characterized by the presence of executive dysfunctions. As organizational strategies may play an important role as a possible endophenotype of the disorder, we decided to investigate non-verbal memory and organizational abilities in OCD. We also investigated how organization and non-verbal memory differ between responder and non-responder patients to pharmacological treatment, to test whether cognitive functions can predict the response to pharmacological treatment.

METHODS

In Study 1, executive and clinical functioning measures were applied to 162 OCD and 95 controls. In Study 2, clinical, intelligence and executive functioning measures were applied to 72 OCD responders and 63 OCD non-responder patients.

RESULTS

OCD patients and controls from Study 1 differed in copy organization (p < 0.01) and delayed recall (p = 0.048). In Study 2, the OCD responders displayed better copy organization (p = 0.013) and lower depressive, anxious and OCD symptoms (p < 0.01 in the three cases). Scores in the following instruments were found to predict the response to pharmacological treatment: HDRS, Y-BOCS, Raven progressive matrices, and Direct digit subtest from the Wechsler's scale (p < 0.01 in all four cases).

LIMITATIONS

In Study 1, the imbalance of the sample can be considered a limitation, whilst in Study 2, some of the levels of pharmacological resistance were not represented.

CONCLUSIONS

In this study, non-verbal memory and organization was affected in OCD. Responder patients also displayed better executive functioning and fluid intelligence. Organizational ability is a predictor of pharmacological response to SSRI monotherapy in a predictive model controlling for anxious symptoms.

Suicide mortality trends in Galicia, Spain and their relationship with economic indicators

BACKGROUND

Recent research has shown an association between unemployment and suicide, but the mediating factors in this relationship are still unknown. In this study, we investigated the effect of unemployment and economic recession on suicide rates in the Spanish region of Galicia between 1975 and 2012 Method. We analysed age-standardised suicide rates in men and women and in four age groups: less than 25 years, 25-45 years, 45-65 years and more than 65 years and performed a joinpoint analysis to determine trend changes throughout 1975-2012 period. Also we analysed the association between suicide, recession and unemployment by means of a temporal trend model with a Generalised Additive Model.

RESULTS

Suicide rates increased from 145 suicides in 1975 to a high in 1993, with 377 deaths by suicide, representing 1.38% of all causes of death, and thereafter they tend to decrease to 335 suicides in 2012. Joinpoint analyses revealed that suicide rates changed differently across sex and age groups. For men, the annual percentage of change (APC) between 1975 and 1988 (CI 95% 1986-1994) was 5.45 (CI 95% = 3.5, -7.2) but from 1988 the APC became negative [-0.66 (CI 95% = -1.3, -0.1)]. For women, APC between 1974 and 1990 (CI 95% 1986-1992) was 4.86 (CI 95% = 3.2, -6.4) and -1.46 subsequently (CI 95% = -2.2, -0.5). Women aged 24 years or less showed stable suicide rates while men from 45-65 years showed two incidence peaks. When we studied the independent correlation between unemployment, recession and suicide, we found a significant association between unemployment and suicide, but not between recession and suicide for both sexes together and for men while for women there was no significant correlation between suicide and unemployment or recession. Finally, when we studied the effect of the interaction between unemployment and recession on suicide we found economic recession and unemployment interacted with regards to suicide rates (F = 5.902; df = 4.167; p = 0.00098) and after adjusting by sex, the effect was confirmed among men (F = 4.827; df = 2.823; p = 0.0087), but not among women (F = 0.001; df = 1.000; p = 0.979).

CONCLUSIONS

Although suicide rates in Galicia are gradually decreasing in the last decades, there are important sex and age differences. Unemployment was related with suicide during economic recession periods according to our results.

Effects of nicotine abstinence on clinical symptoms. Study at 3 and 6-months follow-up of outpatients with schizophrenia

Introduction

Tobacco use has been associated with more excitement and agitation symptoms, greater severity of global psychopathology as measured by the Clinical General Impression (CGI) Scale, and psychotic symptoms in patients with schizophrenia.

Aim

To assess the effects of nicotine abstinence versus nicotine maintenance on the clinical symptoms of a sample of outpatients smokers diagnosed with schizophrenia.

Methods

Sample: 81 outpatients with schizophrenia [72.8% males; mean age (SD) = 43.35 (8.82)] currently smoking tobacco [no. of cigarettes (SD) = 27.96 (12.29)]. Desing: non-randomized, open-label, 6-month follow-up and multi-center study conducted at 3 sites in Spain (Oviedo, Santiago de Compostela and Orense). Instruments: Positive and Negative Syndrome Scale (PANSS), Clinical Global Impression for Schizophrenia (CGI-SCH), Hamilton Depression Rating Scale (HDRS). Antropometric measures: Body mass index (BMI) and waist circumference. Vital sings: heart rate. Procedure: Patients were assigned to 2 conditions:

– control group = patients continuing their tobacco use;

– experimental group = patients participated in vareniclina or nicotine patches treatment for smoking cessation.

Patients were evaluated at baseline (all patients smoking) and after 3 and 6 months.

Results

No significant differences (P>.05) were found between groups at baseline evaluation. Likewise, there were no significant differences between smokers and non-smokers after treatment (3 and 6 months follow-up) in their clinical symptomatology (according to PANSS, HDRS and CGI-SCH), anthropometric measures and heart rate.

Conclusions

No significant differences were found in the clinical symptoms after a period of nicotine abstinence. Therefore, clinicians should motivate and help their patients to quit smoking (CIBERSAM - FIS PI11/01891).

Disclosure of interest

The authors have not supplied their declaration of competing interest.

[Response to electroconvulsive therapy in a case of erotomania]

Secondary erotomania has mainly been associated with functional psychosis (especially schizophrenia) and bipolar disorder. Traditionally, erotomania has been considered chronic and refractory to treatment, although cases of secondary erotomania with response to benzodiazepines, lithium, anticonvulsivants, antipsychotic drugs and electroconvulsive therapy have been described. In this paper, we present a clinical case of secondary erotomania related to paranoid schizophrenia with good response to electroconvulsive therapy and neuroleptics. Actas Esp Psiquiatr 2003;31(6):361-363

[Interface neurology/psychiatry: a case report of neurosyphilis]

Organic diseases can occur with different psychiatric symptoms. Neurosyphilis was considered to be a landmark in the history of organic mental syndromes. The complexity of its clinical picture decreases the boundaries between Neurology and Psychiatry and requires a multidisciplinary approach. We report a case of neurosyphilis that began with psychiatric symptoms in a twenty five years old male.