Biomedical subjects

Rebecca G Knapp

Publications and source records attributed to Rebecca G Knapp.

18 recordsLinked to original sources

PubMed2006

Unrecognized trauma and PTSD among public mental health consumers with chronic and severe mental illness.

Lifetime prevalence of traumatic events and current PTSD was assessed among 142 mental health consumers with serious mental illness served by a psychosocial rehabilitation day program. Lifetime exposure to trauma was high (87%). The rate of PTSD based on the PTSD Checklist (PCL) was also high (19-30% depending on different scoring criteria). Overall, the PCL had strong internal reliability for this sample. Documentation of trauma and PTSD was exceptionally low in medical records. Results suggest that trauma and PTSD are significantly overlooked in the public mental health system. Improved recognition of trauma and PTSD are needed in order to provide meaningful services to this highly vulnerable population.

Adult↗

PubMed2006

Parameter selection for and implementation of a web-based decision-support tool to predict extubation outcome in premature infants.

BACKGROUND: Approximately 30% of intubated preterm infants with respiratory distress syndrome (RDS) will fail attempted extubation, requiring reintubation and mechanical ventilation. Although ventilator technology and monitoring of premature infants have improved over time, optimal extubation remains challenging. Furthermore, extubation decisions for premature infants require complex informational processing, techniques implicitly learned through clinical practice. Computer-aided decision-support tools would benefit inexperienced clinicians, especially during peak neonatal intensive care unit (NICU) census. METHODS: A five-step procedure was developed to identify predictive variables. Clinical expert (CE) thought processes comprised one model. Variables from that model were used to develop two mathematical models for the decision-support tool: an artificial neural network (ANN) and a multivariate logistic regression model (MLR). The ranking of the variables in the three models was compared using the Wilcoxon Signed Rank Test. The best performing model was used in a web-based decision-support tool with a user interface implemented in Hypertext Markup Language (HTML) and the mathematical model employing the ANN. RESULTS: CEs identified 51 potentially predictive variables for extubation decisions for an infant on mechanical ventilation. Comparisons of the three models showed a significant difference between the ANN and the CE (p = 0.0006). Of the original 51 potentially predictive variables, the 13 most predictive variables were used to develop an ANN as a web-based decision-tool. The ANN processes user-provided data and returns the prediction 0-1 score and a novelty index. The user then selects the most appropriate threshold for categorizing the prediction as a success or failure. Furthermore, the novelty index, indicating the similarity of the test case to the training case, allows the user to assess the confidence level of the prediction with regard to how much the new data differ from the data originally used for the development of the prediction tool. CONCLUSION: State-of-the-art, machine-learning methods can be employed for the development of sophisticated tools to aid clinicians' decisions. We identified numerous variables considered relevant for extubation decisions for mechanically ventilated premature infants with RDS. We then developed a web-based decision-support tool for clinicians which can be made widely available and potentially improve patient care world wide.

Birth Weight↗

PubMed2006

Continuation electroconvulsive therapy vs pharmacotherapy for relapse prevention in major depression: a multisite study from the Consortium for Research in Electroconvulsive Therapy (CORE).

BACKGROUND: Although electroconvulsive therapy (ECT) has been shown to be extremely effective for the acute treatment of major depression, it has never been systematically assessed as a strategy for relapse prevention. OBJECTIVE: To evaluate the comparative efficacy of continuation ECT (C-ECT) and the combination of lithium carbonate plus nortriptyline hydrochloride (C-Pharm) in the prevention of depressive relapse. DESIGN: Multisite, randomized, parallel design, 6-month trial performed from 1997 to 2004. SETTING: Five academic medical centers and their outpatient psychiatry clinics. PATIENTS: Two hundred one patients with Structured Clinical Interview for DSM-IV-diagnosed unipolar depression who had remitted with a course of bilateral ECT. INTERVENTIONS: Random assignment to 2 treatment groups receiving either C-ECT (10 treatments) or C-Pharm for 6 months. MAIN OUTCOME MEASURE: Relapse of depression, compared between the C-ECT and C-Pharm groups. RESULTS: In the C-ECT group, 37.1% experienced disease relapse, 46.1% continued to have disease remission at the study end, and 16.8% dropped out of the study. In the C-Pharm group, 31.6% experienced disease relapse, 46.3% continued to have disease remission, and 22.1% dropped out of the study. Both Kaplan-Meier and Cox proportional hazards regression analyses indicated no statistically significant differences in overall survival curves and time to relapse for the groups. Mean +/- SD time to relapse for the C-ECT group was 9.1 +/- 7.0 weeks compared with 6.7 +/- 4.6 weeks for the C-Pharm group (P = .13). Both groups had relapse proportions significantly lower than a historical placebo control from a similarly designed study. CONCLUSIONS: Both C-ECT and C-Pharm were shown to be superior to a historical placebo control, but both had limited efficacy, with more than half of patients either experiencing disease relapse or dropping out of the study. Even more effective strategies for relapse prevention in mood disorders are urgently needed.

Adolescent↗

PubMed2006

Social anxiety disorder in veterans affairs primary care clinics.

To examine the prevalence and correlates of social anxiety disorder (SAD) in veterans, 733 veterans from four VA primary care clinics were evaluated using self-report questionnaires, telephone interviews, and a 12-month retrospective review of primary care charts. We also tested the concordance between primary care providers' detection of anxiety problems and diagnoses of SAD from psychiatric interviews. For the multi-site sample, 3.6% met criteria for SAD. A greater rate of SAD was found in veterans with than without post-traumatic stress disorder (PTSD) (22.0% vs. 1.1%), and primary care providers detected anxiety problems in only 58% of veterans with SAD. The elevated rate of comorbid psychiatric diagnoses and suicidal risk associated with SAD was not attributable to PTSD symptom severity. Moreover, even after controlling for the presence of major depressive disorder, SAD retained unique, adverse effects on PTSD diagnoses and severity, the presence of other psychiatric conditions, and suicidal risk. These results attest to strong relations between SAD and PTSD, the inadequate recognition of SAD in primary care settings, and the significant distress and impairment associated with SAD in veterans.

Adult↗

PubMed2006

Patterns of psychotropic medication use among patients with severe depression referred for electroconvulsive therapy: data from the Consortium for Research on Electroconvulsive Therapy.

Most studies of trends in antidepressant pharmacotherapy have focused on relatively mildly ill, nonpyschotic outpatients. In this report, we provide detailed information on psychotropic use among patients with unipolar depression participating in a large, multisite electroconculsive therapy (ECT) study. Adequacy of antidepressant medication trials was assessed with the Antidepressant Treatment History Form. Among patients with nonpsychotic depression, 27% (60/220) had not had an adequate trial of an antidepressant before ECT, and 63% (139/220) had had at least one inadequate trial. Surprisingly, 33% (79/243) of nonpsychotic patients had been prescribed an antipsychotic. Among patients with psychotic depression, 95% (101/106) had not been given an adequate combination of an antidepressant and antipsychotic agent, mostly due to low doses of the latter class. Among all patients in the trial, 61% (213/352) had been prescribed at least one benzodiazepine, and only 7% (24/352) had been given a lithium augmentation trial. Use of hypnotic agents and anticonvulsants was common. In conclusion, patients with severe depression referred for ECT with a unipolar depressive episode have high rates of psychotropic usage, much of which is inadequate.

Adolescent↗

PubMed2006

Racial differences in psychiatric symptom patterns and service use in VA primary care clinics.

OBJECTIVE: The purpose of this study was to assess racial differences in psychopathology and service use in a sample of African-American and Caucasian veterans. METHODS: African-American (N=253) and Caucasian (N=460) veterans from primary care clinics at four Department of Veterans Affairs (VA) medical centers were compared on rates of trauma, posttraumatic stress disorder (PTSD), other psychiatric diagnoses, functional status, and use of VA services and benefits. A cross-sectional, epidemiologic design incorporating self-report measures, structured interviews, and chart reviews was used. RESULTS: With the exception of substance abuse or dependence diagnoses and use of substance abuse treatment and urgent care services, few racial differences emerged. CONCLUSION: Overall, the findings suggest that African-American and Caucasian veterans, including those with PTSD, do not differ significantly in psychopathology or in their use of VA benefits and services.

Black or African American↗

PubMed2006

Female veterans seeking medical care at Veterans Affairs primary care clinics: psychiatric and medical illness burden and service use.

OBJECTIVE: To examine rates of medical and psychiatric disorders among 187 female veterans recruited at four Veterans Affairs Medical Centers (VAMCs), the recognition of such disorders by VAMC care providers, and the use of relevant medical and mental health services by women both within and outside of the VA setting. METHODS: We used a cross-sectional, epidemiological design incorporating self-report measures, structured interviews, and chart reviews to obtain relevant information for analyses. RESULTS: Forty-four percent (43.9%) of women met criteria for at least one psychiatric disorder; 34.0% of these women met criteria for two or more additional psychiatric diagnoses, and concordance rates between interview and chart diagnoses were low. Ninety-five percent (95.2%) of women had a medical condition noted in their charts; 86.6% had two or more additional medical conditions, and a significant number of women had both medical and psychiatric diagnoses. Forty-four percent (43.9%) of women with an identified mental health condition received specialized mental health care by the VA in the past year. CONCLUSIONS: Findings from this study suggest that female veterans treated in VAMCs had significant medical and psychiatric problems, and these women might not be getting their health care needs adequately met through the VA health care system. In light of our findings, we discuss relevant implications and future directions for research.

Adult↗

PubMed2006

Sertraline treatment for generalized anxiety disorder: a randomized, double-blind, placebo-controlled study.

OBJECTIVE: This study assessed the efficacy and safety of sertraline in the treatment of generalized anxiety disorder (GAD). METHOD: The study was conducted from April 2000 to May 2002. Outpatients with DSM-IV GAD (N = 326) who satisfied inclusion/exclusion criteria and completed a 1-week screening phase were randomly assigned to 10-week double-blind treatment with flexible dosing of sertraline (50-200 mg/day) or placebo. The primary efficacy measure was change from baseline in Hamilton Rating Scale for Anxiety (HAM-A) total score. Response was defined as a 50% or greater decrease in HAM-A total score at endpoint. RESULTS: Sertraline produced a statistically significant reduction in anxiety symptoms, as measured by HAM-A total change scores (p = .032), HAM-A psychic anxiety subscale (p = .011), and Hospital Anxiety and Depression Scale-anxiety subscale (p = .001). Response rates were significantly higher (p = .05) for the sertraline group (59.2%) compared to the placebo group (48.2%). Sertraline was well tolerated, with only sexual side effects reported significantly more often by subjects receiving sertraline than those receiving placebo. CONCLUSION: Despite the relatively small between-group differences, study findings suggest a role for sertraline in the acute treatment of GAD.

Adult↗

PubMed2005

Subthreshold PTSD in primary care: prevalence, psychiatric disorders, healthcare use, and functional status.

The purpose of this study is to determine the prevalence of subthreshold posttraumatic stress disorder (PTSD) and its association with specific traumas, other psychiatric diagnoses, healthcare use, and functional status among 669 veterans in four VA Medical Centers. A cross-sectional, epidemiological design incorporating self-report measures, structured interviews, and chart reviews was used to obtain relevant information for analyses. Comparisons across three trauma-exposed groups (PTSD, subthreshold PTSD, no PTSD) revealed that veterans in the subthreshold PTSD group did not use mental health services more often than those in the no PTSD group despite the presence of additional mental health diagnoses and worse functional status. These data indicate that clinicians may be overlooking a subset of individuals suffering from subsyndromal PTSD, suggesting the need to detect and serve these individuals better within healthcare settings.

Adult↗

PubMed2005

Patients' reports of traumatic or harmful experiences within the psychiatric setting.

OBJECTIVE: This study examined the frequency and associated distress of potentially traumatic or harmful experiences occurring within psychiatric settings among persons with severe mental illness who were served by a public-sector mental health system. METHODS: Participants were 142 randomly selected adult psychiatric patients who were recruited through a day hospital program. Participants completed a battery of self-report measures to assess traumatic and harmful events that occurred during the course of their mental health care, lifetime trauma exposure, and symptoms of posttraumatic stress disorder. RESULTS: Data revealed high rates of reported lifetime trauma that occurred within psychiatric settings, including physical assault (31 percent), sexual assault (8 percent), and witnessing traumatic events (63 percent). The reported rates of potentially harmful experiences, such as being around frightening or violent patients (54 percent), were also high. Finally, reported rates of institutional measures of last resort, such as seclusion (59 percent), restraint (34 percent), takedowns (29 percent), and handcuffed transport (65 percent), were also high. Having medications used as a threat or punishment, unwanted sexual advances in a psychiatric setting, inadequate privacy, and sexual assault by a staff member were associated with a history of exposure to sexual assault as an adult. CONCLUSIONS: Findings suggest that traumatic and harmful experiences within psychiatric settings warrant increased attention.

Adult↗

PubMed2005

Adjunctive risperidone in generalized anxiety disorder: a double-blind, placebo-controlled study.

OBJECTIVE: Although significant advances have been made in recent years in the treatment of generalized anxiety disorder (GAD), many patients remain symptomatic despite ongoing treatment, underscoring the need for adjunctive new treatments to help improve response. METHOD: Forty patients with a primary diagnosis of DSM-IV GAD, who continued to experience GAD symptoms despite current anxiolytic treatment of at least 4 weeks' duration, as evidenced by Hamilton Rating Scale for Anxiety (HAM-A) total score > or = 18 and Clinical Global Impressions-Severity of Illness scale score of moderate or greater, completed a 1-week screening phase and were then randomly assigned to 5 weeks of double-blind adjunctive treatment with placebo or risperidone at flexible doses of 0.5 to 1.5 mg/day. Patients continued to take their anxiolytics throughout the study. The study was conducted from June 2001 through March 2003. RESULTS: Adjunctive risperidone was associated with statistically significant improvements in core anxiety symptoms, as demonstrated by greater reductions in HAM-A total scores (p = .034) and HAM-A psychic anxiety factor scores (p = .047) compared with placebo. Although change scores on other outcome variables, including response rates, were higher in the risperidone group, differences did not achieve statistical significance. CONCLUSION: Study findings suggest that risperidone at low doses may represent a useful tool in the management of symptomatic GAD patients.

Anti-Anxiety Agents↗

PubMed2004

Relationship between somatization and remission with ECT.

Patients treated with electroconvulsive therapy (ECT) were divided into those with less severe depression and those with more severe depression. In the less severely depressed group, high somatic anxiety and hypochondriasis predicted a low likelihood of sustained remission with ECT. In the more severely depressed group, these traits were not predictive of ECT outcome.

Adult↗

PubMed2004

Predicting extubation outcome in preterm newborns: a comparison of neural networks with clinical expertise and statistical modeling.

Even though ventilator technology and monitoring of premature infants has improved immensely over the past decades, there are still no standards for weaning and determining optimal extubation time for those infants. Approximately 30% of intubated preterm infants will fail attempted extubation, requiring reintubation and resuming of mechanical ventilation. A machine-learning approach using artificial neural networks (ANNs) to aid in extubation decision making is hereby proposed. Using expert opinion, 51 variables were identified as being relevant for the decision of whether to extubate an infant who is on mechanical ventilation. The data on 183 premature infants, born between 1999 and 2002, were collected by review of medical charts. The ANN extubation model was compared with alternative statistical modeling using multivariate logistic regression and also with the clinician's own predictive insight using sensitivity analysis and receiver operating characteristic curves. The optimal ANN model used 13 parameters and achieved an area under the receiver operating characteristic curve of 0.87 (out-of-sample validation), comparing favorably with multivariate logistic regression. It also compared well with the clinician's expertise, which raises the possibility of being useful as an automated alert tool. Because an ANN learns directly from previous data obtained in the institution where it is to be used, this makes it particularly amenable for application to evidence-based medicine. Given the variety of practices and equipment being used in different hospitals, this may be particularly relevant in the context of caring for preterm newborns who are on mechanical ventilation.

Decision Making↗

PubMed2004

PTSD symptoms, demographic characteristics, and functional status among veterans treated in VA primary care clinics.

We hypothesized that PTSD symptomatology would have an inverse relationship with functional status and would vary as a function of sociodemographic variables. Primary care patients (N = 513) at two VA Medical Centers were randomly selected and recruited to participate. After adjustment for other demographic variables, PTSD symptom levels were significantly related to age (younger patients had more severe symptoms), employment status (disabled persons had higher symptom levels), war zone experience, and clinic location. PTSD symptomatology was inversely related to mental and physical functioning, even after control for potential confounding. These findings have implications for screening and service delivery in VA primary care clinics, and support the more general finding in the literature that PTSD is associated with impaired functioning.

Aged↗

PubMed2004

Telepsychiatry treatment outcome research methodology: efficacy versus effectiveness.

The use of videoconferencing technology to provide mental health services (telepsychiatry) offers hope for addressing longstanding problems regarding work force shortages and access to care, especially in remote or rural areas. However, data on treatment outcomes (i.e., based on randomized clinical trials) from telepsychiatry applications are virtually nonexistent, representing an important gap in the literature. An important methodological decision point in developing treatment outcome research is whether to take an efficacy or effectiveness approach. Efficacy approaches offer enhanced internal validity; however, they may have limited generalizability to real-world settings. Effectiveness approaches offer enhanced external validity. But, they are typically less controlled than efficacy studies, thereby limiting the assumptions that can be made about causality. The current state of telepsychiatry research necessitates efficacy studies, the outcomes from which can be used to inform future effectiveness studies.

Health Services Research↗

PubMed2003

Recent advances in telepsychiatry: an updated review.

OBJECTIVE: In response to new developments and interest in the area of telepsychiatry, literature on this topic has greatly increased over the past three years. Because of this increase, the authors conducted a literature review of telepsychiatry to update a previously published review that covered the years 1970 to 2000. METHODS: A search was conducted on the MEDLINE, PsycINFO, and Telemedicine Information Exchange (TIE) databases for literature published from March 2000 to March 2003 on telepsychiatry applications, using the following terms: telepsychiatry, telepsychology, telemental health, videoconferencing, and video conferencing. RESULTS: Sixty-eight publications were identified over this three-year period, exceeding the 63 publications identified in the previous literature review. The authors summarize the results of findings in six areas: novel clinical demonstrations and current program descriptions; the reliability of clinical assessments; clinical outcomes; satisfaction of patients and clinicians; cost and cost-effectiveness; and legal, regulatory, and ethical issues. Studies describing existing programs and novel clinical applications support the belief that the use of telepsychiatry is expanding. Overall, studies continued to support the notion that telepsychiatry assessments can produce reliable results, telepsychiatric services can lead to improved clinical status, and patients and clinicians are satisfied with treatment delivered via telepsychiatry. Evidence supported the notion that telepsychiatry is a cost-effective means of delivering mental health services; however, this conclusion was based on limited studies of economic models of telepsychiatry programs. Also limited were papers on the topics of legal, regulatory, and ethical issues. CONCLUSIONS: Despite the rapid increase in information on telepsychiatry, methodologically sound studies in the area of telepsychiatry are still infrequent.

Consumer Behavior↗

PubMed2003

Web-based prediction of extubation outcome in premature infants on mechanical ventilation using an artificial neural network.

The web-based implementation of a decision-support tool for the prediction of extubation outcome in mechanically ventilated premature infants enables the integration of advanced and computationally intensive modeling approaches with easy-usage, no maintenance requirements and wide availability. Accordingly, the artificial neural network predictive tool developed provides decision-support in determining whether to extubate a premature infant to clinicians in NICUs anywhere with access to the Internet.

Decision Making, Computer-Assisted↗

PubMedDate not supplied

Prevalence of posttraumatic stress disorder in Veterans Affairs primary care clinics.

Although posttraumatic stress disorder (PTSD) is relatively common in community epidemiologic surveys (5-6% for men, 10-12% for women), and psychiatric patients with PTSD are known to have poor functioning and high levels of psychiatric comorbidity, there are no studies that address PTSD prevalence, functioning, and burden in primary care settings. This article reports on (1) the prevalence of PTSD using Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition diagnostic criteria in Veterans Affairs (VA) primary care settings, (2) associated sociodemographic characteristics and comorbidities, (3) functional status related to PTSD, (4) the extent to which PTSD was recognized by providers and (5) health services use patterns (including specialty mental health) of PTSD patients. Patients were randomly selected from those who had an outpatient visit in FY 1999 at one of four VA hospitals; 888 patients consented (74.1% of 1198 contacted); 746 patients (84.0% of consenting patients; 62.3% of contacted patients) were reached for telephone diagnostic interviews. Diagnostic interviews with the Clinician Administered PTSD Scale yielded estimates of current PTSD prevalence of 11.5%. At statistically significant levels, PTSD was positively associated with a variety of comorbid psychiatric disorders, war zone service, age <65 years, not working, less formal education and decreased functioning. Of patients diagnosed with PTSD by study procedures, 12-month medical record review indicated that providers identified only 46.5% and only 47.7% had used mental health specialty services. PTSD-positive [PTSD(+)] patients who used mental health care in the past 12 months were more apt to be identified as having PTSD than nonmental health service users (78.0% vs. 17.8%). Although PTSD(+) patients had more medical record diagnoses than PTSD-negative [PTSD(-)] patients (6.28 vs. 4.95), their use of primary care, urgent care and inpatient care was not different from PTSD(-) patients.

Adolescent↗