Tuesday May 31, 2022
Lead Story: Getting to the Heart of Cannabis Health Risks
Getting to the Heart of Cannabis Health Risks
Cell Press
Cannabis has deleterious effects on cardiovascular physiology. Wei et al. (Cell 185, May 12, 2022) confirm that important inflammatory markers increase transiently after a single marijuana joint and prove a mechanistic link between THC induced vascular inflammation, endothelial dysfunction, cellular oxidative stress, and atherosclerosis using cell-based and mouse models of atherosclerosis. They provide a pharmacological model in which THC-mediated activation of CB1 receptor signaling pathways converge on MAP kinase, TNFa, and NF-kB outputs to create a proinflammatory and atherogenic environment in endothelial cells. That genistein can antagonize the negative effects of THC with minimal central effects is exciting because genistein is a common component of soy and is already a widely consumed dietary product.
Nature Medicine
Pregnant smokers were randomized to use either nicotine replacement therapy with patches (NRT, n=571) or e-cigarettes (n=569) for smoking cessation. For the primary outcome, validated prolonged quit rates at the end of pregnancy, the results were 4.4% for NRT and 6.8% for e-cigarettes (P=0.08). However, 25 participants in the NRT arm who reported abstinence also used e-cigarettes. When these participants were excluded from data analysis the quit rates were 3.6% for NRT and 6.8% for e-cigarettes (P=0.02). Low birthweight was less common in the e-cigarette arm, 9.6% versus 14.8% for NRT (P=0.01). The authors conclude that “e-cigarettes were markedly more effective than patches” and do not pose more risk.
Preventive Medicine Reports
Cannabis use has steadily increased in the United States, with daily and medical use associated with cannabis use disorder (CUD) and the negative consequences more frequent among marginalized groups. In this study, the authors use the National Survey on Drug Use and Health (NSDUH) to examine medical and daily use and CUD across the intersections of racial, ethnic, and sexual minorities. They found that sexual minorities were more likely to have medical and daily use and CUD than their heterosexual counterparts within each racial and ethnic group. However, when examining the intersection of race, ethnicity and sexual identity, there was more heterogeneity across these groups. In addition, they found that in states with medical cannabis laws (MCL) daily cannabis use was higher across all intersectional groups.
AJP Psychiatry
Altered glutamatergic neurotransmission is implicated in the pathogenesis of major depressive disorder. AXS-05 (dextromethorphan-bupropion) is an oral NMDA receptor antagonist and sigma-1 receptor agonist, which utilizes inhibition of CYP2D6 to increase its bioavailability. This phase 2 trial assessed the efficacy and safety of dextromethorphan-bupropion in the treatment of major depressive disorder. In patients with major depression, dextromethorphan-bupropion (AXS-05) significantly improved depressive symptoms compared with bupropion and was generally well tolerated. The most common adverse events were dizziness, nausea, dry mouth, decreased appetite, and anxiety. Dextromethorphan-bupropion was not associated with psychotomimetic effects, weight gain, or sexual dysfunction.
Mental Health and Substance Use Among Homeless Adolescents in the US
JAMA Network
This study evaluated mental health and substance use outcomes among homeless and non-homeless adolescents in 2019. Alcohol, cigarette, marijuana, and binge drinking during the prior 30 days was assessed, along with lifetime use of cocaine, methamphetamine, heroin, ecstasy, and injection drugs or prescription opioid misuse. Results found current substance use ranging from cigarettes to alcohol were higher among homeless adolescents. Lifetime cocaine use was significantly higher among homeless adolescents, as were methamphetamine, heroin, ecstasy, and injection drug use. Homeless adolescents experience worse mental health outcomes, including depression and suicidality, and struggle with more SUDs than their counterparts.
The Importance of Federal Action Supporting Overdose-Prevention Centers
NEJM
In this prospective piece, the authors discuss the need for new approaches to harm reduction and substance use disorder treatment in the face of substantially increasing overdose deaths, particularly since the start of the COVID-19 pandemic. One such strategy they discuss is overdose-prevention centers, which operate in other countries and are associated with significant reductions in opioid-overdose morbidity and mortality. However, under Section 856 of the Controlled Substances Act, such facilities may be subject to federal legal sanctions. The authors recommend that the Biden administration declare they will not interfere with such public health interventions or declare that section 856 does not apply to legally sanctioned centers. Further, Congress should modify the Controlled Substance Act to exempt overdose-prevention centers.
Complex Persistent Benzodiazepine Dependence—When Benzodiazepine Deprescribing Goes Awry
JAMA Psychiatry
Benzodiazepines remain popular medications among patients due to rapid symptom relief and reinforcing effects. As clinicians and patients become more aware of potential risks, and clinical guidelines increasingly urge caution in prescribing, guidance for benzodiazepine deprescribing is needed. The authors propose a new clinical concept for patients experiencing significant psychological or functional decline during or after a benzodiazepine taper—complex
persistent benzodiazepine dependence (CPBD). CPBD can be described as symptomatic or functional decompensation with or without the development of aberrant medication behaviors in the setting of benzodiazepine deprescribing–in the absence of a benzodiazepine use disorder. Further research is needed to validate this concept.
JSAT
Opioid abstinence and treatment retention are typically used as measures of success of MOUD treatment. This study sought to identify other important treatment outcomes and patient-centered measures of success. Qualitative, structured interviews were conducted with physicians (n=14) and patients (n=18) in 2 family medicine residency programs. The physicians (7 faculty and 7 residents) were experienced buprenorphine prescribers. Both patients and physicians identified 5 themes: staying sober, and improvement in physical health, mental health, relationships, and role functioning. Patients, but not physicians, identified 2 additional themes: tapering off buprenorphine, and decreased stigma and shame. The authors conclude that “clinicians and researchers need to consider a broader scope of success indicators.”