How reviews covered the unfolding scientific story of gabapentin for bipolar disorder

Trends in Antipsychotic and Mood Stabilizer Prescribing in Long-Term Care in the U.S.: 2011-2014

OBJECTIVE

The Centers for Medicare and Medicaid Services' National Partnership to Improve Dementia Care in Nursing Homes focuses on but is not limited to long-term care (LTC) residents with dementia; the potential impact on residents with other diagnoses is unclear. We sought to determine whether resident subpopulations experienced changes in antipsychotic and mood stabilizer prescribing.

DESIGN

Repeated cross-sectional analysis of a 20% Medicare sample, 2011-2014.

SETTING AND PARTICIPANT

Fee-for-service Medicare beneficiaries with Part D coverage in LTC (n = 562,485) and a secondary analysis limited to persons with depression or bipolar disorder (n = 139,071).

METHODS

Main outcome was quarterly predicted probability of treatment with an antipsychotic or mood stabilizer.

RESULTS

From 2011 to 2014, the adjusted predicted probability (APP) of antipsychotic treatment fell from 0.120 [95% confidence interval (CI) 0.119-0.121] to 0.100 (95% CI 0.099-0.101; P < .001). Use decreased for all age, sex, and racial/ethnic groups; the decline was larger for persons with dementia (P < .001). The APP of mood stabilizer use grew from 0.140 (95% CI 0.139-0.141) to 0.185 (95% CI 0.184-0.186), growth slightly larger among persons without dementia (P < .001). Among persons with depression or bipolar disorder, the APP of antipsychotic treatment increased from 0.081 (95% CI 0.079-0.082) to 0.087 (95% CI 0.085-0.088; P < .001); APP of mood stabilizer treatment grew more, from 0.193 (95% CI 0.190-0.196) to 0.251 (0.248-0.253; P < .001). Quetiapine was the most commonly prescribed antipsychotic. The most widely prescribed mood stabilizer was gabapentin, prescribed to 70.5% of those who received a mood stabilizer by the end of 2014.

CONCLUSIONS AND IMPLICATIONS

The likelihood of antipsychotic and mood stabilizer treatment did not decline for residents with depression or bipolar disorder, for whom such prescribing may be appropriate but who were not excluded from the Partnership's antipsychotic quality measure. Growth in mood stabilizer use was widespread, and largely driven by growth in gabapentin prescribing.

Gabapentin Therapy in Psychiatric Disorders: A Systematic Review

OBJECTIVE

Gabapentin is commonly used off-label in the treatment of psychiatric disorders with success, failure, and controversy. A systematic review of the literature was performed to elucidate the evidence for clinical benefit of gabapentin in psychiatric disorders.

DATA SOURCES

Bibliographic reference searches for gabapentin use in psychiatric disorders were performed in PubMed and Ovid MEDLINE search engines with no language restrictions from January 1, 1983, to October 1, 2014, excluding nonhuman studies. For psychiatric references, the keywords bipolar, depression, anxiety, mood, posttraumatic stress disorder (posttraumatic stress disorder and PTSD), obsessive-compulsive disorder (obsessive-compulsive disorder and OCD), alcohol (abuse, dependence, withdraw), drug (abuse, dependence, withdraw), opioid (abuse, dependence, withdraw), cocaine (abuse, dependence, withdraw), and amphetamine (abuse, dependence, withdraw) were crossed with gabapentin OR neurontin.

STUDY SELECTION AND DATA EXTRACTION

The resulting 988 abstracts were read by 2 reviewers; references were excluded if gabapentin was not a study compound or psychiatric symptoms were not studied. The resulting references were subsequently read, reviewed, and analyzed; 219 pertinent to gabapentin use in psychiatric disorders were retained. Only 34 clinical trials investigating psychiatric disorders contained quality of evidence level II-2 or higher.

RESULTS

Gabapentin may have benefit for some anxiety disorders, although there are no studies for generalized anxiety disorder. Gabapentin has less likely benefit adjunctively for bipolar disorder. Gabapentin has clearer efficacy for alcohol craving and withdrawal symptoms and may have a role in adjunctive treatment of opioid dependence. There is no clear evidence for gabapentin therapy in depression, PTSD prevention, OCD, or other types of substance abuse. Limitations of available data include variation in dosing between studies, gabapentin as monotherapy or adjunctive treatment, and differing primary outcomes between trials.

CONCLUSIONS

Further research is required to better clarify the benefit of gabapentin in psychiatric disorders.

Evidence-informed person-centered healthcare part I: do 'cognitive biases plus' at organizational levels influence quality of evidence?

INTRODUCTION

There is increasing concern about the unreliability of much of health care evidence, especially in its application to individuals.

HYPOTHESIS

Cognitive biases, financial and non-financial conflicts of interest, and ethical violations (which, together with fallacies, we collectively refer to as 'cognitive biases plus') at the levels of individuals and organizations involved in health care undermine the evidence that informs person-centred care.

METHODS

This study used qualitative review of the pertinent literature from basic, medical and social sciences, ethics, philosophy, law etc.

RESULTS

Financial conflicts of interest (primarily industry related) have become systemic in several organizations that influence health care evidence. There is also plausible evidence for non-financial conflicts of interest, especially in academic organizations. Financial and non-financial conflicts of interest frequently result in self-serving bias. Self-serving bias can lead to self-deception and rationalization of actions that entrench self-serving behaviour, both potentially resulting in unethical acts. Individuals and organizations are also susceptible to other cognitive biases. Qualitative evidence suggests that 'cognitive biases plus' can erode the quality of evidence.

CONCLUSIONS

'Cognitive biases plus' are hard wired, primarily at the unconscious level, and the resulting behaviours are not easily corrected. Social behavioural researchers advocate multi-pronged measures in similar situations: (i) abolish incentives that spawn self-serving bias; (ii) enforce severe deterrents for breaches of conduct; (iii) value integrity; (iv) strengthen self-awareness; and (v) design curricula especially at the trainee level to promote awareness of consequences to society. Virtuous professionals and organizations are essential to fulfil the vision for high-quality individualized health care globally.

Modulation of ion channels in clinical psychopharmacology: adults and younger people

This review focuses on the use of Na(+), Ca(2+) and Cl(-) channel modulators in psychiatric disease. Drugs that modulate ion channels have been used in psychiatry for more than a century, and in this review we critically evaluate clinical research that reports the therapeutic effects of drugs acting on GABA(A), voltage-gated Na(+) and voltage-gated Ca(2+) channels in pediatric and adult patients. As in other fields, the evidence underpinning the use of medicines in younger people is far less robust than for adults. In addition, we discuss some current developments and highlight clinical disorders in which current molecules could be further tested. Notable success stories, such as benzodiazepines (in sleep and anxiety disorders) and antiepileptics (in bipolar disorder), have been the result of serendipitous discoveries or refinements of serendipitous discoveries, as in all other major treatments in psychiatry. Genomic, high-throughput screening and molecular pharmacology discoveries may, however, guide further developments in the future. This could include increased research in promising targets that have been perceived as commercially risky, such as selective α-subunit GABA(A) receptors.

Biases in medication prescribing: the case of second-generation antipsychotics

The shift from first-generation antipsychotic medications to second-generation antipsychotic medications initially caused a wave of excitement about the potential for improved and broader efficacy of these medications concurrent with an improved side-effect profile. Recent data from high-quality research analyses have subsequently raised significant questions about these claims. This research evidence has, however, not altered prescribing behavior in a way that would be expected from fully rational evaluation of the evidence. Prescribing decisions represent poorly understood, complex behaviors influenced by a number of external and internal forces, some of which may be elucidated by advances in social and cognitive psychology. In this article, the decision to prescribe first- versus second-generation antipsychotic medications is examined, and specific social psychological biases and individual cognitive biases are hypothesized to be significant influences on clinicians. These biases may perpetuate disparity between research evidence and clinical practice.

Acute nonpsychotic mania: first episode

Mr. Jones, 30 years of age, presents to the office for the first time with symptoms of mania. He had gone through a period of increased spending during which he purchased thousands of dollars worth of audio and video equipment in addition to other items he could not afford. He is currently living with his parents due to his inability to meet these financial obligations. When his parents starting receiving packages at their house, they decided to have Mr. Jones evaluated. They note that he is awake much of the night talking on the phone and browsing the Internet. His bills indicate large charges for phone sex and pornography.