View clinical trials related to Mental Disorders.
Filter by:Previous research involving families, twins, and adoption all support the idea that there is a substantial heritable aspect to personality. The goal of this research study is to determine how genetics influence heritable personality traits. The work will focus on how genetics affect the chemical messengers which brain cells use to communicate with each other (neurotransmitters). The study involves collecting personality data and DNA samples from related individuals, primarily male siblings and female siblings, but also including parents. Genetic tests performed on these samples will continue to focus on variations in genes, which potentially effect brain neurotransmission. This research has the potential to advance knowledge of genetic influences on human behavior that may be relevant both to normal personality and to psychopathology.
A subgroup of patients with childhood-onset obsessive-compulsive disorder (OCD) and/or tic disorders has been identified who share a common clinical course characterized by dramatic onset and symptom exacerbations following group A beta-hemolytic streptococcal (GABHS) infections. This subgroup is designated by the acronym PANDAS (Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal infections). There are five clinical characteristics that define the PANDAS subgroup: presence of OCD and/or tic disorder; prepubertal symptom onset; sudden onset or abrupt exacerbations (relapsing-remitting course); association with neurological abnormalities (presence of adventitious movements or motoric hyperactivity during exacerbations); and temporal association between symptom exacerbations and GABHS infections. In this subgroup, periodic exacerbations appear to be triggered by GABHS infections in a manner similar to that of Sydenham's chorea, the neurological variant of rheumatic fever. Rheumatic fever is a disorder with a presumed post-streptococcal autoimmune etiology. The streptococcal pathogenesis of rheumatic fever is supported by studies that have demonstrated the effectiveness of penicillin prophylaxis in preventing recurrences of this illness. A trial of penicillin prophylaxis in the PANDAS subgroup demonstrated that penicillin was not superior to placebo as prophylaxis against GABHS infections in these children, but this outcome was felt to be secondary to non-compliance with treatment, and there was no decrease in the number of neuropsychiatric symptom exacerbations in this group. In a study comparing azithromycin and penicillin, both drugs were completely effective in preventing streptococcal infections - there were no documented titer elevations during the year-long study period for children taking either penicillin or azithromycin. Comparable reductions in the severity of tics and obsessive-compulsive symptoms were also observed. Thus, penicillin was not performing as an "active placebo" as originally postulated, but rather provided effective prophylaxis against Group A beta-hemolytic streptococcal. Both azithromycin and penicillin appear to be effective in eliminating GABHS infections, and reducing neuropsychiatric symptom severity; thus, between-group differences are negligible. Since increasing the "n" to demonstrate superiority of one prophylactic agent over another would be impractical, we have amended the study design to address two issues: 1. To determine if antibiotics prophylaxis against GABHS infections is superior to placebo in prolonging periods of remission among children in the PANDAS subgroup. 2. To determine if antibiotics prophylaxis against GABHS infections is superior to placebo in improving overall symptom severity for obsessive-compulsive symptoms and tics among children in the PANDAS subgroup. Because penicillin has a narrower therapeutic index and is less expensive than azithromycin, it is the preferable prophylactic agent. Further, penicillin (250 mg orally twice a day) has a long history of providing safe and effective prophylaxis for rheumatic fever and is the first line oral therapy recommended by the American Heart Association. Thus, penicillin has been chosen as the prophylactic antibiotic in the present study. Blister packs are used to increase compliance and to allow for easier documentation of missed doses.
The purpose of this study is to evaluate the cognitive processes of participants with schizophrenia, participants with nervous system and mental disorders, and healthy volunteers. Participants in this study will undergo cognitive tests of attention, memory, attention. Participants with attention deficit hyperactivity disorder (ADHD), traumatic brain injury (TBI), bipolar disorder, and Alzheimer's disease (AD) will be compared with participants with schizophrenia. A group of healthy adults and children will undergo cognitive tests to further delineate the degree of impairment in schizophrenia and neurological disorder participants.
A conduct disorder is characterized by repetitive and persistent patterns of behavior where the basic rights of others and rules are violated. This study investigates characteristics of children and their surroundings (environments) that place them at risk for the development of disruptive behavior disorders and associated disorders of anxiety and mood. Children ages 4 - 5 with moderate (subclinical) and severe (clinical) rates of misconduct during the preschool period are compared to low risk children. Children and their families were recruited from 1989-1991 and are being studied at five specific times: 1. Preschool (4 - 5 years) 2. Early childhood (6 - 7 years) 3. Middle childhood (9 - 10 years) 4. Early adolescence (13 - 14 years) 5. Mid-adolescence (15 - 16 years) Researchers will look closely at biological, intellectual, emotional, and behavioral factors that are thought to protect against and/or increase the risk of developing a conduct problem. These factors have been studied in older children and are shown to be associated with disruptive behavior disorders. The goals of this research study are; 1. Create a database showing the characteristics of the development of disruptive behavior problems. 2. Identify the key risk and protective factors that contribute to the stability or change in behavior problems over time. 3. Identify the ways that children interact socially and relate them to the possibility of developing a problem of behavior. 4. Identify how experiences and the emotions associated with experiences may play a role in the development of related psychiatric conditions, like depression and anxiety. 5. Establish measures of the different components of negative emotions associated with disruptive/antisocial, anxiety, and mood disorders.
The normal menstrual cycle is produced by a series of hormonal signals that starts with the release of gonadotropin-releasing hormone (GnRH) from the hypothalamus. The hypothalamus is located in the brain and is often referred to as the master gland. GnRH then acts on the pituitary gland and causes it to release two hormones, follicle stimulating hormone (FSH) and lutenizng hormone (LH). LH and FSH act on the ovary and cause it to release the hormones directly involved in menstruation, estrogen and progesterone. The purpose of this research study is to evaluate the hypothalamic-pituitary-gonadal axis activity as measured by pituitary hormones, FSH and LH in response to intravenous doses of gonadotropin releasing hormone (GnRH) in menstrual cycle-related hormones.
The purpose of this study is to evaluate individuals with Attention Deficit/Hyperactivity Disorder (ADHD) to learn more about the genetics of the disease. This study is part of other ongoing studies of individuals with ADHD. The study participants have already undergone neurobiological measurements, particularly magnetic resonance imaging (MRI) of the brain, through other research studies. As a follow-up to these studies, participants will next undergo psychiatric interviews, neuropsychological tests, and another MRI. In addition to the clinical evaluation of the participants, further research will be conducted on the genetics of ADHD. These genetic studies will evaluate people with ADHD as well as their family members and a control group of healthy people.