Biomedical subjects

Kevin D Kjernisted

Publications and source records attributed to Kevin D Kjernisted.

5 recordsLinked to original sources

PubMed2006

Striatal function in generalized social phobia: a functional magnetic resonance imaging study.

BACKGROUND: Although evidence suggests the involvement of the amygdala in generalized social phobia (GSP), few studies have examined other neural regions. Clinical, preclinical, and dopamine receptor imaging studies demonstrating altered dopaminergic functioning in GSP suggest an association with striatal dysfunction. This is the first functional magnetic resonance imaging (fMRI) study to use a cognitive task known to involve the striatum to examine the neural correlates of GSP. We examined whether subjects with GSP had differential activation in striatal regions compared with healthy control subjects while engaged in a cognitive task that has been shown to activate striatal regions reliably. METHODS: Ten adult, unmedicated subjects with a primary DSM-IV diagnosis of GSP and 10 age-, gender-, and education-matched healthy comparison subjects underwent fMRI while performing the implicit sequence learning task. RESULTS: The GSP and healthy comparison subjects did not differ significantly on the behavioral performance of the task. Subjects with GSP, however, had significantly reduced neural activation related to implicit learning compared with healthy comparison subjects in the left caudate head, left inferior parietal lobe, and bilateral insula. CONCLUSIONS: These findings support the hypothesis that GSP is associated with striatal dysfunction and further the neurobiological understanding of this complex anxiety disorder.

Adult↗

PubMed2004

Do antipsychotics ameliorate or exacerbate Obsessive Compulsive Disorder symptoms? A systematic review.

BACKGROUND: Paradoxically, some reports in the literature support the use of antipsychotics in the treatment of Obsessive Compulsive Disorder (OCD), while other reports suggest that antipsychotics can exacerbate OCD symptoms. To date, there is no published systematic review of the relationship between OCD symptoms and antipsychotic drugs. METHODS: A Medline and PsychInfo search (1980-2003) was conducted to collect published reports of the interactions between antipsychotics and OCD symptoms. RESULTS: In the treatment of refractory OCD, case series, open label trials and placebo-controlled trials were found suggesting efficacy of antipsychotic augmentation to ongoing antidepressant treatment. In the placebo-controlled trials with haloperidol, risperidone, olanzapine, and quetiapine, a significantly higher response rate (46-71%) was found for the antipsychotic groups, compared to no response for the placebo groups. Reports of exacerbation of OCD symptoms with the use of atypical antipsychotics were limited to individuals with a primary psychotic disorder. LIMITATIONS: Definition of response in most of these treatment studies was based on a modest reduction of OCD symptoms, and no studies were available on long-term efficacy. There were also no published reports that systematically evaluated the incidence of OCD symptoms associated with atypical antipsychotics. CONCLUSIONS: All antipsychotics mentioned above had short-term controlled evidence to support their use as augmenting agents in the treatment of refractory OCD. The suggested management of OCD induction/exacerbation due to atypical antipsychotics is to increase the dose of the atypical antipsychotic and/or add a selective serotonin reuptake inhibitor.

Antidepressive Agents↗

PubMed2004

Deficits in perceived social support associated with generalized social phobia.

Social phobia is a common anxiety disorder associated with significant impairment in social and occupational functioning. To date, few studies have examined the relationship between social phobia and perceived social support, a construct with important relationships to physical and mental health. The present study examined data from 2 widely used measures of perceived social support administered to 132 individuals with DSM-IV generalized social phobia. These data were compared with those obtained from a healthy control group and from several clinical and non-clinical samples reported in the literature. Persons with generalized social phobia scored significantly lower on both measures of social support compared with all other groups. It is suggested that deficits in perceived social support associated with generalized social phobia may play a role in the development of co-morbid problems and should be explicitly targeted by treatments for social phobia. Low correlations between perceived social support and social anxiety measures suggest that perceived support should be specifically evaluated in this population.

Adult↗

PubMed2004

Long-term goals in the management of acute and chronic anxiety disorders.

Many anxiety disorders are not treated to remission (symptom-free state); however, this should be the minimum goal of therapy. Antidepressant therapies have shown significant beneficial effects in the management of anxiety disorders, with some variability in results in specific disorders. In social anxiety disorder, selective serotonin reuptake inhibitors and venlafaxine extended release (XR) have demonstrated efficacy, with response rates varying between 40% and 68%. Monoamine oxidase inhibitors and cognitive-behavioural therapies are also effective. In patients with generalized anxiety disorder, benzodiazepines, paroxetine, and venlafaxine XR have demonstrated remission rates that are 15% to 25% higher than placebo. In patients with posttraumatic stress disorder, about 60% to 70% of patients experienced a response with antidepressant therapy, compared with about 40% on placebo, while remission rates in one study were 30% with venlafaxine, 24% with sertraline, and 20% with placebo. In patients with obsessive-compulsive disorder, a 25% to 35% improvement in symptom scores was reported in 20% to 65% of patients. In the management of panic disorder, paroxetine and venlafaxine XR doubled the percentage of patients who were panic-free, compared with placebo. Ongoing antidepressant therapy further improved remission rates, and many patients with anxiety disorders required extended treatment trials before experiencing benefit. In most clinical trials, some benefits were seen within 3 to 4 weeks but continued to accrue throughout the 3- to 6-month duration of the trial. In the acute phase, patients with anxiety disorders should be treated aggressively with antidepressants for extended periods and may require long-term therapy to maintain benefits. Cognitive-behavioural therapy is another mainstay in the treatment of all anxiety disorders; exposure to feared situations is necessary to move beyond phobic avoidance and functional impairment to full recovery, the ultimate goal of therapy.

Acute Disease↗

PubMedDate not supplied

An open-label clinical trial of nefazodone in hypochondriasis.

Hypochondriasis is a common and challenging problem in general medical practice, but little research is available on pharmacotherapeutic treatment approaches. The purpose of the present study was to evaluate the use of nefazodone in the treatment of hypochondriasis in an open-label trial. Eleven patients with a primary diagnosis of DSM-IV hypochondriasis received an 8-week trial of nefazodone with a maximum dose of 600 mg/day and a mean dose of 432 mg. Clinician and self-ratings were completed at each of six visits. Nine of the 11 patients who started the trial completed 8 weeks of treatment. Five of the nine patients completing the trial were rated as much or very much improved on the clinician-rated global improvement scale. Self-ratings indicated statistically significant improvement on the Illness Attitudes Scales-Total Score (P <.01) and the Beck Depression Inventory (P <.04), and there was a trend toward improvement on the Whiteley Index (P <.06). The results of this study suggest that nefazodone is a promising treatment for hypochondriasis. More extensive evaluation in longer open-label trials and double-blind, placebo-controlled trials would be warranted.

Adult↗