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1.
Article in English | MEDLINE | ID: mdl-38276790

ABSTRACT

The use of information and communication technologies (ICTs) has become widespread in recent years, leading to an increase in addiction cases. A total of 118 patients who attended the Behavioral Addictions Unit of Consorci Sanitari de Terrassa (Barcelona, Spain) between October 2005 and December 2021 were included in the study. The sample was divided into three groups according to the time period in which they started treatment: between 2005 and 2010 (before the rise in new technologies, named the pre-ICT period), between 2011 and 2019 (a time of major ICT development, named the ICT period) and between 2020 and 2021 (with massive use of the internet due to effects of the pandemic, named the COVID-19 period). We found an increase in the incidence of screen addiction cases related to the development of technology throughout the study years, and this increase was accentuated during the COVID-19 period. This increase was not equal for all types of content consumed via the internet, with patients with video game addiction increasing to a greater extent than patients with internet/social network addiction. In addition, patients with video game addiction were younger and had started gaming at a younger age than those with internet/social network addiction. These results contribute to a better understanding of the phenomenon of technology addiction and to the design of appropriate treatment protocols and preventive programs.


Subject(s)
Behavior, Addictive , COVID-19 , Video Games , Humans , Behavior, Addictive/epidemiology , Internet , Communication , COVID-19/epidemiology
2.
Psiquiatr. biol. (Internet) ; 27(3): 105-114, sept.-dic. 2020. tab, graf
Article in Spanish | IBECS | ID: ibc-198676

ABSTRACT

Los trastornos depresivos son una de las principales causas de discapacidad global y la presencia de déficits cognitivos se relacionan con un peor pronóstico. Dado que la rehabilitación cognitiva en este trastorno está poco estudiada, y menos sus efectos a largo plazo, nuestro objetivo fue investigar sus beneficios en la mejora cognitiva y funcional de estos pacientes. Veintidós participantes fueron asignados aleatoriamente a: a) terapia cognitivo conductual grupal; y b) terapia cognitivo conductual grupal+terapia de rehabilitación cognitiva. Se realizó una evaluación al inicio del tratamiento, a los 3 y 6 meses de la finalización del mismo. Los participantes asignados al grupo con terapia de rehabilitación cognitiva mejoraron más su funcionamiento ejecutivo y estos efectos se mantenían en el tiempo. Sin embargo, no se encontraron diferencias entre ambos grupos en funcionamiento psicosocial. Estos resultados apoyan la importancia de seguir investigando la utilidad de la rehabilitación cognitiva en la recuperación de pacientes con trastornos depresivos


Depressive disorders are one of the main causes of global burden disease and cognitive impairment is associated with worse prognosis. Cognitive Remediation Therapy (CRT) and its long-term effects are understudied; our aim is to investigate the benefits of CRT in the cognitive and functional improvement and maintenance of theses patients. Twenty-two participants were randomly assigned to: a) Group Cognitive Behavioral Therapy (CBT-G) and b) CBT-G plus CRT. Patients were evaluated before treatment, at 3 and 6 months after the end of the treatment. Participants assigned to the TRC group improved more in executive function and its effects remain over time. However, no differences were found between groups in psychosocial functioning improving. These results support the relevance of continue investigating the usefulness of CRT in depression patients recovery


Subject(s)
Humans , Male , Female , Adolescent , Young Adult , Adult , Middle Aged , Aged , Depressive Disorder/complications , Depressive Disorder/rehabilitation , Cognition Disorders/rehabilitation , Brief Psychiatric Rating Scale , Treatment Outcome , Socioeconomic Factors
3.
Front Psychiatry ; 11: 590554, 2020.
Article in English | MEDLINE | ID: mdl-33519547

ABSTRACT

Background: Gambling landscape has changed in recent years with the emergence of online gambling (OG). Greater accessibility and availability of this betting modality can increase the risk of developing a gambling disorder (GD). Online sports betting (OSB) is currently the most common type of OG, but little is known about the clinical characteristics of OSB compared to slot-machine (SM) gamblers, the most common offline gambling disorder. Methods: This was a prospective study conducted between October 2005 and September 2019, and included outpatients diagnosed with GD seen in a Pathological Gambling and Behavioral Addictions referral unit. Only patients with OSB and SM disorders were included. The main objective was to assess the clinical profile of OSB compared to SM gamblers, and to define clinical predictors for developing OSB gambling disorder. Logistic regression was performed to determine the effects of variables on the likelihood of this disorder. Results: Among 1,186 patients attended in our Unit during the study period, 873 patients were included; 32 (3.7%) were OSB gamblers and 841 (96.3%) were SM gamblers. Overall, mean age was 45 ± 13 years and 94.3% were men. Compared to SM patients, OSB patients were younger (34.9 ± 9.5 vs. 45.3 ±13), more frequently single (43.8 vs. 20.6%) and had a university education level (43.8 vs. 4.5%); they were also more frequently non-smokers (18.7 vs. 66.7%) and had fewer psychiatric comorbidities (12.5 vs. 29.4%) than SM gamblers. GD duration before treatment initiation was shorter in OSB patients than in SM gamblers, most of them (81.3 vs. 42.4%) with ≤ 5 years of GD duration. OSB gamblers showed significant differences in weekly gambling expenditure, spending higher amounts than SM patients. Younger age (OR: 0.919; 95% CI: 0.874-0.966), university education level (OR: 10.658; 95% CI: 3.330-34.119), weekly expenditure >100€ (OR: 5.811; 95% CI:1.544-21.869), and being a non-smoker (OR:13.248; 95% CI:4.332-40.517) were associated with an increased likelihood of OSB gambling behavior. Conclusions: We identified different profiles for OSB and SM gamblers. Younger age, university education level, higher weekly expenditure, and non-smoking habit were associated with OSB compared to SM disorders. Prevention strategies should help young people become aware of the severe risks of OSB.

4.
Rev. Soc. Esp. Dolor ; 26(2): 126-127, mar.-abr. 2019. ilus
Article in Spanish | IBECS | ID: ibc-190886

ABSTRACT

El síndrome de espalda fallida es una de las patologías más frecuentes para estimulación de los cordones posteriores. Aunque es una técnica segura, no está exenta de complicaciones. Presentamos un caso poco habitual de migración en SCS


Failed back surgery syndrome is one of the most common indications for spinal cord stimulation. Although is a safe technique, it has some complications such electrode migration. Here is an unusual migration case of a SCS electrode in a FBSS patient


Subject(s)
Humans , Male , Middle Aged , Neuralgia/therapy , Failed Back Surgery Syndrome/therapy , Transcutaneous Electric Nerve Stimulation/methods , Low Back Pain/therapy , Breakthrough Pain/therapy , Pain Management/methods , Treatment Outcome
5.
Compr Psychiatry ; 83: 79-83, 2018 05.
Article in English | MEDLINE | ID: mdl-29625378

ABSTRACT

INTRODUCTION: In gambling disorder (GD), impulsivity has been related with severity, treatment outcome and a greater dropout rate. The aim of the study is to obtain an empirical classification of GD patients based on their impulsivity and compare the resulting groups in terms of sociodemographic, clinical and gambling behavior variables. METHODS: 126 patients with slot machine GD attending the Pathological Gambling Unit between 2013 and 2016 were included. The UPPS-P Impulsive Behavior Scale was used to assess impulsivity, and the severity of past-year gambling behavior was established with the Screen for Gambling problems questionnaire (NODS). Depression and anxiety symptoms and executive function were also assessed. A two-step cluster analysis was carried out to determine impulsivity profiles. RESULTS: According to the UPPS-P data, two clusters were generated. Cluster 1 showed the highest scores on all the UPPS-P subscales, whereas patients from cluster 2 exhibited only high scores on two UPPS-P subscales: Negative Urgency and Lack of premeditation. Additionally, patients on cluster 1 were younger and showed significantly higher scores on the Beck Depression Inventory and on the State-Trait Anxiety Inventory questionnaires, worse emotional regulation and executive functioning, and reported more psychiatric comorbidity compared to patients in cluster 2. With regard to gambling behavior, cluster 1 patients had significantly higher NODS scores and a higher percentage presented active gambling behavior at treatment start than in cluster 2. CONCLUSIONS: We found two impulsivity subtypes of slot machine gamblers. Patients with high impulsivity showed more severe gambling behavior, more clinical psychopathology and worse emotional regulation and executive functioning than those with lower levels of impulsivity. These two different clinical profiles may require different therapeutic approaches.


Subject(s)
Gambling/diagnosis , Gambling/psychology , Impulsive Behavior , Adult , Comorbidity , Depressive Disorder/diagnosis , Depressive Disorder/psychology , Executive Function/physiology , Female , Humans , Impulsive Behavior/physiology , Male , Middle Aged , Personality Inventory/statistics & numerical data , Prospective Studies , Psychiatric Status Rating Scales , Psychopathology , Registries , Surveys and Questionnaires
6.
Adicciones ; 30(3): 219-224, 2018 Jul 12.
Article in English, Spanish | MEDLINE | ID: mdl-29353301

ABSTRACT

The aim of the current study is to determine the effectiveness of an individual psychological intervention based on the motivational interview and cognitive-behavioral therapy for the treatment of pathological gambling. A sample of 18 participants, diagnosed of pathological gambling and without any other associated comorbidity, were assessed, attended at the publicly-funded Gambling and Behavioral Addictions Unit (Consorci Sanitari de Terrassa). Median age was 46 years (SD = 12). All the patients achieved abstinence and completed follow-up. The Screen for Gambling Problems (NODS), Quality of Life Enjoyment and Satisfaction (Q-LES-Q), Impulsive Behavior Scale (UPPS-P), Sheehan Disability Inventory (SDI), Beck Depression Inventory (BDI) and State-Trait Anxiety Inventory (STAI) were administered pre- and posttreatment. Results showed that patients significantly reduced the problems related to gambling behavior according to the NODS score (p < .000). Regarding impulsive behavior (UPPS-P), we found significant differences in negative urgency (p < .001), positive urgency (p < .001), (lack of) premeditation (p < .029) and (lack of) perseverance (p < .048). Some relevant aspects of quality of life as assessed by the Q-LES-Q had improved. In conclusion, the study shows that psychological intervention based on the motivational interview and cognitive-behavioral therapy not only significantly reduces gambling-related behavior problems but also leads to improvements in impulsivity and quality of life. .


El propósito del presente estudio es analizar la eficacia de una intervención psicológica individual basada en Entrevista Motivacional y Terapia cognitivo-conductual en el tratamiento del Juego Patológico, y evaluar la eficacia de esta intervención psicológica sobre la impulsividad y la calidad de vida de los pacientes. La muestra se compone de 18 pacientes atendidos en la Unidad de Juego Patológico del Consorci Sanitari Terrassa, diagnosticados de Juego Patológico, y sin comorbilidad asociada. La media de edad fue de 46 años (SD=12). Todos ellos alcanzaron la abstinencia y se encontraban en fase de seguimiento. Se administraron pre y post tratamiento los siguientes cuestionarios: Screen for Gambling Problems (NODS), Quality of Life Enjoyment and Satisfaction (Q-LES-Q), UPPS-P Impulsive Behavior Scale, Sheehan Disability Inventory (SDI), Beck Depression Inventory (BDI), State-trait Anxiety Inventory (STAI). Los resultados muestran una reducción significativa de los problemas asociados a la conducta de juego (p<.000). También se encontraron diferencias significativas en la impulsividad (UPPS-P) pre-post: urgencia negativa (p<.001), urgencia positiva (p<.001), (falta de) premeditación (p<.029) y (falta de) perseverancia (p<.048). Así mismo, hay una mejoría significativa en la calidad de vida (Q-LES-Q) de nuestros pacientes en distintas áreas. En conclusión, el estudio pone de manifiesto que la intervención psicológica basada en Entrevista Motivacional y Terapia Cognitivo-conductual permite una mejora significativa del Juego Patológico que repercute no sólo en la conducta de juego sino que también implica otros aspectos como la impulsividad y la calidad de vida.


Subject(s)
Cognitive Behavioral Therapy , Gambling/therapy , Motivational Interviewing , Combined Modality Therapy , Female , Gambling/psychology , Humans , Impulsive Behavior , Male , Middle Aged , Quality of Life , Treatment Outcome
7.
Adicciones (Palma de Mallorca) ; 30(3): 219-224, 2018. tab
Article in Spanish | IBECS | ID: ibc-177811

ABSTRACT

El propósito del presente estudio es analizar la eficacia de una intervención psicológica individual basada en Entrevista Motivacional y Terapia cognitivo-conductual en el tratamiento del Juego Patológico, y evaluar la eficacia de esta intervención psicológica sobre la impulsividad y la calidad de vida de los pacientes. La muestra se compone de 18 pacientes atendidos en la Unidad de Juego Patológico del Consorci Sanitari Terrassa, diagnosticados de Juego Patológico, y sin comorbilidad asociada. La media de edad fue de 46 años (SD=12). Todos ellos alcanzaron la abstinencia y se encontraban en fase de seguimiento. Se administraron pre y post tratamiento los siguientes cuestionarios: Screen for Gambling Problems (NODS), Quality of Life Enjoyment and Satisfaction (Q-LES-Q), UPPS-P Impulsive Behavior Scale, Sheehan Disability Inventory (SDI), Beck Depression Inventory (BDI), Statetrait Anxiety Inventory (STAI). Los resultados muestran una reducción significativa de los problemas asociados a la conducta de juego (p<.000). También se encontraron diferencias significativas en la impulsividad (UPPS-P) pre-post: urgencia negativa (p<.001), urgencia positiva (p<.001), (falta de) premeditación (p<.029) y (falta de) perseverancia (p<.048). Así mismo, hay una mejoría significativa en la calidad de vida (Q-LES-Q) de nuestros pacientes en distintas áreas. En conclusión, el estudio pone de manifiesto que la intervención psicológica basada en Entrevista Motivacional y Terapia Cognitivoconductual permite una mejora significativa del Juego Patológico que repercute no sólo en la conducta de juego sino que también implica otros aspectos como la impulsividad y la calidad de vida


The aim of the current study is to determine the effectiveness of an individual psychological intervention based on the motivational interview and cognitive-behavioral therapy for the treatment of pathological gambling. A sample of 18 participants, diagnosed of pathological gambling and without any other associated comorbidity, were assessed, attended at the publicly-funded Gambling and Behavioral Addictions Unit (Consorci Sanitari de Terrassa). Median age was 46 years (SD = 12). All the patients achieved abstinence and completed follow-up. The Screen for Gambling Problems (NODS), Quality of Life Enjoyment and Satisfaction (Q-LES-Q), Impulsive Behavior Scale (UPPS-P), Sheehan Disability Inventory (SDI), Beck Depression Inventory (BDI) and State-Trait Anxiety Inventory (STAI) were administered pre- and posttreatment. Results showed that patients significantly reduced the problems related to gambling behavior according to the NODS score (p < .000). Regarding impulsive behavior (UPPS-P), we found significant differences in negative urgency (p < .001), positive urgency (p < .001), (lack of) premeditation (p < .029) and (lack of) perseverance (p < .048). Some relevant aspects of quality of life as assessed by the Q-LES-Q had improved. In conclusion, the study shows that psychological intervention based on the motivational interview and cognitive-behavioral therapy not only significantly reduces gambling-related behavior problems but also leads to improvements in impulsivity and quality of life


Subject(s)
Humans , Male , Female , Middle Aged , Cognitive Behavioral Therapy , Gambling/therapy , Motivational Interviewing , Treatment Outcome , Combined Modality Therapy , Gambling/psychology , Impulsive Behavior , Quality of Life
8.
Psychiatry Res ; 254: 198-204, 2017 08.
Article in English | MEDLINE | ID: mdl-28463718

ABSTRACT

The durability of computer-assisted cognitive remediation (CACR) therapy over time and the cost-effectiveness of treatment remains unclear. The aim of the current study is to investigate the effectiveness of CACR and to examine the use and cost of acute psychiatric admissions before and after of CACR. Sixty-seven participants were initially recruited. For the follow-up study a total of 33 participants were enrolled, 20 to the CACR condition group and 13 to the active control condition group. All participants were assessed at baseline, post-therapy and 12 months post-therapy on neuropsychology, QoL and self-esteem measurements. The use and cost of acute psychiatric admissions were collected retrospectively at four assessment points: baseline, 12 months post-therapy, 24 months post-therapy, and 36 months post-therapy. The results indicated that treatment effectiveness persisted in the CACR group one year post-therapy on neuropsychological and well-being outcomes. The CACR group showed a clear decrease in the use of acute psychiatric admissions at 12, 24 and 36 months post-therapy, which lowered the global costs the acute psychiatric admissions at 12, 24 and 36 months post-therapy. The CACR is durable over at least a 12-month period, and CACR may be helping to reduce health care costs for schizophrenia patients.


Subject(s)
Cognitive Behavioral Therapy/methods , Cognitive Remediation/methods , Cost-Benefit Analysis/methods , Schizophrenia/therapy , Therapy, Computer-Assisted/methods , Adult , Cognitive Behavioral Therapy/economics , Cognitive Remediation/economics , Female , Follow-Up Studies , Hospitalization/economics , Humans , Male , Neuropsychological Tests , Retrospective Studies , Schizophrenia/economics , Single-Blind Method , Therapy, Computer-Assisted/economics , Treatment Outcome
9.
Compr Psychiatry ; 57: 58-64, 2015 Feb.
Article in English | MEDLINE | ID: mdl-25434846

ABSTRACT

There is little available information on the factors that influence relapses and dropouts during therapy for pathological gambling (PG). The aim of this study was to determine socio-demographic, clinical, personality, and psychopathological predictors of relapse and dropout in a sample of pathological gamblers seeking treatment. A total of 566 consecutive outpatients diagnosed with PG according to DSM-IV-TR criteria were included. All patients underwent an individualized cognitive-behavioral treatment program. We analyzed predictors of relapse during 6months of treatment and during the subsequent 6months of follow-up, and predictors of dropout over the entire therapeutic program. Eighty patients (14.1%) experienced at least one relapse during the entire follow-up of the study: 50 (8.8%) within the treatment period and 12 (2.1%) during the subsequent 6-month follow-up period. The main predictors of relapse were single marital status, spending less than 100euros/week on gambling, active gambling behavior at treatment inclusion, and high scores on the TCI-R Harm Avoidance personality dimension. One hundred fifty-seven patients (27.8%) missed 3 or more therapeutic sessions over the entire therapeutic program. The main predictors of dropout were single marital status, younger age, and high scores on the TCI-R Novelty Seeking personality dimension. The presence of these factors at inclusion should be taken into account by physicians dealing with PG patients.


Subject(s)
Cognitive Behavioral Therapy , Gambling , Patient Dropouts , Adult , Aged , Exploratory Behavior , Female , Humans , Male , Middle Aged , Personality , Psychopathology , Recurrence , Risk Factors
10.
Schizophr Res ; 150(2-3): 563-9, 2013 Nov.
Article in English | MEDLINE | ID: mdl-24035402

ABSTRACT

BACKGROUND: Quality of life (QoL) is an important outcome in the treatment of schizophrenia. Cognitive deficits have an impact on functional outcomes. Cognitive remediation therapy is emerging as a psychological intervention that targets cognitive impairment, but the effect of computer-assisted cognitive remediation on neuropsychology and social functioning and wellbeing remains unclear. The aim of the current study is to investigate the neurocognitive outcomes of computer-assisted cognitive remediation (CACR) therapy in a sample of schizophrenia patients, and to measure the quality of life and self-esteem as secondary outcomes. METHODS: Sixty-seven people with schizophrenia were randomly assigned to computer-assisted cognitive remediation or an active control condition. The main outcomes were neuropsychological measures and secondary outcomes (self-esteem and quality of life). Measurements were recorded at baseline and post-treatment. RESULTS: The CACR therapy group improved in speed of processing, working memory and reasoning and problem-solving cognitive domains. QoL and self-esteem measures also showed significant improvements over time in this group. CONCLUSIONS: Computer-assisted cognitive remediation therapy for people with schizophrenia achieved improvements in neuropsychological performance and in QoL and self-esteem measurements.


Subject(s)
Cognition Disorders/rehabilitation , Cognitive Behavioral Therapy/methods , Quality of Life/psychology , Schizophrenic Psychology , Self Concept , Therapy, Computer-Assisted , Adult , Analysis of Variance , Cognition Disorders/etiology , Female , Humans , Longitudinal Studies , Male , Neuropsychological Tests , Outcome Assessment, Health Care , Schizophrenia/complications , Young Adult
11.
Biol Psychol ; 87(3): 358-65, 2011 Jul.
Article in English | MEDLINE | ID: mdl-21549804

ABSTRACT

An accurate representation of task-set information is needed for successful goal directed behavior. Recent studies point to disturbances in the early processing stages as plausible causes for task-switching deficits in schizophrenia. A task-cueing protocol was administered to a group of schizophrenic patients and compared with a sample of age-matched healthy controls. Patients responded slower and less accurate compared with controls in all conditions. The concurrent recording of event-related brain potentials to contextual cues and target events revealed abnormalities in the early processing of both cue-locked and target-locked N1 potentials. Abnormally enhanced target-locked P2 amplitudes were observed in schizophrenic patients for task-switch trials only, suggesting disrupted stimulus evaluation and memory retrieval processes. The endogenous P3 potentials discriminated between task conditions but without further differences between groups. These results suggest that the observed impairments in task-switching behavior were not specifically related to anticipatory set-shifting, but derived from a deficit in the implementation of task-set representations at target onset in the presence of irrelevant and conflicting information.


Subject(s)
Brain/physiopathology , Evoked Potentials/physiology , Psychomotor Performance/physiology , Schizophrenia/physiopathology , Adult , Cognition/physiology , Cues , Electroencephalography , Female , Humans , Male , Neuropsychological Tests , Reaction Time/physiology
12.
Talanta ; 84(2): 347-54, 2011 Apr 15.
Article in English | MEDLINE | ID: mdl-21376956

ABSTRACT

Isothermal titration calorimetry (ITC) is used to study the complexation thermodynamics of Ni(II) with histidine (His) and with N-2-aminoethylglycine (EDMA). The titrations were performed in HEPES and Tris buffers at various ionic strengths and pH values around 8. The results show the influence of the experimental conditions on the shape and fitting parameters of the calorimetric curves. For the studied systems, the main reaction is concomitant with a number of side reactions which contribute to the global energy measured. From the calorimetric data measured, the formation constants for the species NiHEPES(+), Tris(+)His(-), TrisNiHis(+) and [Ni(EDMA)(2)OH](-) have been evaluated for the first time and the values obtained properly validated.


Subject(s)
Calorimetry/methods , Glycine/analogs & derivatives , Histidine/chemistry , Nickel/chemistry , Glycine/chemistry , Hydrogen-Ion Concentration , Osmolar Concentration
13.
Biol Psychol ; 78(3): 253-60, 2008 Jul.
Article in English | MEDLINE | ID: mdl-18450358

ABSTRACT

Behavioral and electrophysiological brain responses were used to examine the relationship between the vulnerability to distraction and the orienting response in schizophrenia. Nineteen schizophrenics and nineteen matched healthy controls were instructed to ignore task-irrelevant auditory stimuli while they classified capital letters and digits. The auditory sequences contained repetitive standard tones occasionally replaced by complex novel sounds. Relative to controls, patients showed an increased behavioral distraction, as indicated by a larger response time increase caused by novel sounds, and a disturbance in the attention orienting toward distracting stimuli, as indicated by a reduced novelty-P3. This behavioral-electrophysiological dissociation may stem from a limited pool of available resources. Thus, the few attentional resources directed toward novel stimuli would be sufficient to cause an important decrease of the similarly reduced amount of resources assigned to task-relevant stimuli, resulting in a striking impairment of the ongoing task performance.


Subject(s)
Attention/physiology , Evoked Potentials/physiology , Schizophrenic Psychology , Acoustic Stimulation , Adult , Auditory Perception/physiology , Brain/physiology , Data Interpretation, Statistical , Electroencephalography , Electrophysiology , Female , Humans , Male , Psychiatric Status Rating Scales , Psychomotor Performance/physiology , Reaction Time/physiology
14.
Schizophr Res ; 100(1-3): 308-15, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18164902

ABSTRACT

Relationships between gender, age-of-onset of schizophrenia and reproductive age strongly suggest a key role for gonadal hormones, and more specifically for estrogens, in the etiology of the illness. Also, estrogens act as neural growth and trophic factors influencing neuron and glial cells in many areas of the central nervous system. Therefore, we investigated the association between schizophrenia and 4 genes related to estrogen metabolism. These genes are ESR1 (estrogen receptor 1), ESR2 (estrogen receptor 2), APOE (apolipoprotein E) and COMT (catechol-O-methyltransferase). The expression of APOE and COMT, which contain estrogen response elements, have been demonstrated to be regulated by the estrogen receptors. In this current association study, we examined 59 single nucleotide polymorphisms (SNPs) located in the ESR1 (26), ESR2 (14), APOE (7) and COMT (12) loci. Allele frequencies were evaluated in the schizophrenia (n=585)-control (n=615) sample and no association was found with any of the four genes. In conclusion, our data suggest that the four analyzed genes do not play an important role in susceptibility to schizophrenia.


Subject(s)
Apolipoproteins E/genetics , Catechol O-Methyltransferase/genetics , Estrogen Receptor alpha/genetics , Estrogen Receptor beta/genetics , Genetic Variation/genetics , Schizophrenia/genetics , Chromosome Mapping/statistics & numerical data , Control Groups , Female , Gene Frequency/genetics , Genetic Predisposition to Disease/genetics , Genotype , Haplotypes/genetics , Humans , Linkage Disequilibrium/genetics , Male , Middle Aged , Polymorphism, Single Nucleotide/genetics , Risk Factors , Sex Factors
15.
Talanta ; 73(1): 115-20, 2007 Aug 15.
Article in English | MEDLINE | ID: mdl-19071857

ABSTRACT

Methanol is the organic solvent closest to water and able to dissolve a huge amount of organic compounds. Therefore, it is a good candidate for pK(a) determination of drugs sparingly soluble in water or a basic drug presented as a salt which pK(a) is close to that of its counter-acid. In this work, the acidic dissociation constants in pure methanol of the most common acids used in pharmaceutical preparations (lactic, tartaric, fumaric, maleic and citric) were determined. In addition, the pK(a) values of the antipsychotic quetiapine presented as hemifumarate (Seroquel) and the very insoluble antiarrhythmic amiodarone were also determined by potentiometry. From these values, the aqueous pK(a) of these drugs were estimated by means of previously established equations. Estimated values are consistent with those from literature and show the interest of methanol for drug discovery pK(a) measurements.

16.
J Org Chem ; 71(24): 9062-7, 2006 Nov 24.
Article in English | MEDLINE | ID: mdl-17109531

ABSTRACT

The acidity constants (pKa) of 11 bases (amines, anilines, pyridines, pyrrolidines, and iminophosphoranes) have been determined in tetrahydrofuran by potentiometry, complemented by conductometric measurements. The pK(a) values of the studied bases cover a wide absolute pH range of acidity in tetrahydrofuran, from 7.4 to 21.7. From the pK(a) values obtained, a scale of absolute acidity in tetrahydrofuran has been established, which has allowed calculation of the absolute pKa values of 77 bases from literature relative pK(a) data.

17.
Eur J Pharm Sci ; 28(1-2): 118-27, 2006 May.
Article in English | MEDLINE | ID: mdl-16488581

ABSTRACT

The acidic dissociation constants in a number of methanol/water mixtures of mono and polycarboxylic acids commonly used in the preparation of drug salts were determined. These solvent mixtures are usually used to determine the pKa of drugs of low aqueous solubility. However, when these drugs are prepared in salt form, the acid-base equilibria of both the basic drug and the counter-anion are involved in the potentiometric titration curves. In these instances, the inclusion of the pKa of acids as constant values in the curve fitting provides easy computation of the drug pKa without the need of any previous step to get the free base. As an application example, the aqueous pKa values of the quetiapine formulated as hemifumarate (Seroquel) were estimated by extrapolation from the experimental pKa in several methanol/water mixtures, which were then calculated according to the suitable constants of fumaric acid. The estimated aqueous pKa values of quetiapine are compared with those directly obtained in aqueous solution by potentiometry and by capillary electrophoresis.


Subject(s)
Antipsychotic Agents/administration & dosage , Antipsychotic Agents/chemistry , Carboxylic Acids/chemistry , Dibenzothiazepines/administration & dosage , Dibenzothiazepines/chemistry , Fumarates/chemistry , Algorithms , Buffers , Chemical Phenomena , Chemistry, Pharmaceutical , Chemistry, Physical , Electrophoresis, Capillary , Hydrogen-Ion Concentration , Methanol , Potentiometry , Quetiapine Fumarate , Salts/chemistry , Solvents , Water
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