The persistent use of psychostimulant drugs, despite the detrimental outcomes associated with continued drug use, may be because of disruptions in reinforcement-learning processes that enable behavior to remain flexible and goal directed in dynamic environments. To identify the reinforcement-learning processes that are affected by chronic exposure to the psychostimulant methamphetamine (MA), the current study sought to use computational and biochemical analyses to characterize decision-making processes, assessed by probabilistic reversal learning, in rats before and after they were exposed to an escalating dose regimen of MA (or saline control). The ability of rats to use flexible and adaptive decision-making strategies following changes in stimulus-reward contingencies was significantly impaired following exposure to MA. Computational analyses of parameters that track choice and outcome behavior indicated that exposure to MA significantly impaired the ability of rats to use negative outcomes effectively. These MA-induced changes in decision making were similar to those observed in rats following administration of a dopamine D2/3 receptor antagonist. These data use computational models to provide insight into drug-induced maladaptive decision making that may ultimately identify novel targets for the treatment of psychostimulant addiction. We suggest that the disruption in utilization of negative outcomes to adaptively guide dynamic decision making is a new behavioral mechanism by which MA rigidly biases choice behavior.

Purpose of ReviewTo describe models of integrated and co-located care for opioid use disorder (OUD), hepatitis C (HCV), and HIV.Recent FindingsThe design and scale-up of multidisciplinary care models that engage, retain, and treat individuals with HIV, HCV, and OUD are critical to preventing continued spread of HIV and HCV. We identified 17 models within primary care (N = 3), HIV specialty care (N = 5), opioid treatment programs (N = 6), transitional clinics (N = 2), and community-based harm reduction programs (N = 1), as well as two emerging models.SummaryKey components of such models are the provision of (1) medication-assisted treatment for OUD, (2) HIV and HCV treatment, (3) HIV pre-exposure prophylaxis, and (4) behavioral health services. Research is needed to understand differences in effectiveness between co-located and fully integrated care, combat the deleterious racial and ethnic legacies of the “War on Drugs,” and inform the delivery of psychiatric care. Increased access to harm reduction services is crucial.Electronic supplementary materialThe online version of this article (10.1007/s11904-018-0396-x) contains supplementary material, which is available to authorized users.

Background: Older people with human immunodeficiency virus -HIV (OPWH) defined as 50 years old account for a growing proportion of newly diagnosed infections in Ukraine (16% in 2018), but the prevalence of substance use disorder among OPWH in Ukraine remains unknown. Ukraine responded to the Covid-19 pandemic with a comprehensive lockdown in late March 2020. Objectives: We conducted a phone survey among 123 OPWH with substance use disorders (SUD) in Kyiv in May 2020 to learn if these older adults may continue HIV and SUD therapy while coping with the Covid-19 pandemic. Results: Data from the survey demonstrated that while OPWH with SUD maintained HIV and SUD therapy throughout Covid-19 lockdown, social support is critical to avoiding treatment interruption for OPWH with SUD. Conclusions/Importance: During reopening, reduction of support may lead to OPWH feeling even more isolated. Post-Covid-19 pharmacological approaches to SUD treatment without social support are like vehicles without gas. The research agenda for OPWH patients with SUD going forward must include determining the type of telehealth support that will be optimally effective to retain OPWH including people who inject drugs (PWID), provision of support by lay health workers, and cost-effectiveness of such interventions. The lessons learned may be relevant to other countries as well.

Breastfeeding has been shown to benefit infants and mothers. Women who have caesarean deliveries (C-sections) are expected to be less likely to initiate and continue breastfeeding than those who have vaginal deliveries. Given the high rate of C-sections in Nicaragua, the importance of breastfeeding, and the centrality of culture in choices about breastfeeding, this study sought to examine if mode of delivery relates with breastfeeding initiation and exclusivity in Nicaragua.Two hundred fifty mothers were surveyed about birth experiences and breastfeeding behaviour

Background Schizophrenia is a debilitating neuropsychiatric disorder typically diagnosed from late adolescence to adulthood. Sub-threshold behavioral symptoms (e.g., cognitive deficits and substance abuse) often precede the clinical diagnosis of schizophrenia. However, these prodromal symptoms have not been consistently associated with structural and functional brain biomarkers, limiting the chance of early diagnosis of schizophrenia. Methods Using an extensively multi-modal range of magnetic resonance methods (for anatomy, metabolism and function) we screened early biomarkers in methylazoxymethanol acetate (MAM) rat model of schizophrenia and saline-treated control (SHAM) rats, in conjunction with immunohistochemistry, myelin staining, and a novel three-choice, reversal-learning task to identify early behavioral markers corresponding the sub-threshold symptoms. Results MAM (vs. SHAM) rats had lower/higher structural connectivity in anterior/posterior corpus callosum. The orbitofrontal cortex (OFC) of MAM rats showed lower resting-state fMRI functional connectivity in conjunction with lower neuronal density, lower glucose oxidation and attenuated neurotransmission (hypofrontality). In contrast, these measures were all higher in visual cortex of MAM rats (posterior hyperactivity), which might parallel perceptual problems in schizophrenia. In behavioral studies MAM (vs. SHAM) rats displayed abnormal OFC-mediated decision-making processes, resulting in a novel reward-sensitive hyperflexible phenotype, which might reflect vulnerability of prodromal patients to substance abuse. Conclusion We identified two novel biomarkers of early schizophrenia in a preclinical rat model: hypofrontality associated with the hyperflexible phenotype and posterior hyperactivity. Since each of these magnetic resonance methods is clinically translatable, these markers could contribute to early diagnosis and the development of novel therapies of schizophrenia.