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Denervated myofibers and senescent cells are hallmarks of skeletal muscle aging. However, sparse research has examined how resistance training affects these outcomes. We investigated the effects of unilateral leg extensor resistance training (2 days/week for 8 weeks) on denervated myofibers, senescent cells, and associated protein markers in apparently healthy middle-aged participants (MA, 55 ± 8 years old, 17 females, 9 males). We obtained dual-leg vastus lateralis (VL) muscle cross-sectional area (mCSA), VL biopsies, and strength assessments before and after training. Fiber cross-sectional area (fCSA), satellite cells (Pax7+), denervated myofibers (NCAM+), senescent cells (p16+ or p21+), proteins associated with denervation and senescence, and senescence-associated secretory phenotype (SASP) proteins were analyzed from biopsy specimens. Leg extensor peak torque increased after training (p < .001), while VL mCSA trended upward (interaction p = .082). No significant changes were observed for Type I/II fCSAs, NCAM+ myofibers, or senescent (p16+ or p21+) cells, albeit satellite cells increased after training (p = .037). While >90% satellite cells were not p16+ or p21+, most p16+ and p21+ cells were Pax7+ (>90% on average). Training altered 13 out of 46 proteins related to muscle-nerve communication (all upregulated, p < .05) and 10 out of 19 proteins related to cellular senescence (9 upregulated, p < .05). Only 1 out of 17 SASP protein increased with training (IGFBP-3, p = .031). In conclusion, resistance training upregulates proteins associated with muscle-nerve communication in MA participants but does not alter NCAM+ myofibers. Moreover, while training increased senescence-related proteins, this coincided with an increase in satellite cells but not alterations in senescent cell content or SASP proteins. These latter findings suggest shorter term resistance training is an unlikely inducer of cellular senescence in apparently healthy middle-aged participants. However, similar study designs are needed in older and diseased populations before definitive conclusions can be drawn.
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Senescencia Celular , Entrenamiento de Fuerza , Humanos , Entrenamiento de Fuerza/métodos , Masculino , Femenino , Persona de Mediana Edad , Senescencia Celular/fisiología , Fibras Musculares Esqueléticas/metabolismo , Fibras Musculares Esqueléticas/fisiología , Biomarcadores/metabolismo , Células Satélite del Músculo Esquelético/metabolismo , Músculo Esquelético/metabolismo , Músculo Esquelético/fisiología , Factor de Transcripción PAX7/metabolismo , Inhibidor p21 de las Quinasas Dependientes de la Ciclina/metabolismo , Inhibidor p16 de la Quinasa Dependiente de Ciclina/metabolismo , Adulto , Músculo Cuádriceps/metabolismo , Músculo Cuádriceps/inervaciónRESUMEN
BACKGROUND: The scientific literature in consultation-liaison psychiatry continually expands, and remaining familiar with the most current literature is challenging for practicing clinicians. The Guidelines and Evidence-Based Medicine Subcommittee of the Academy of Consultation-Liaison Psychiatry writes quarterly annotations of articles of interest to help Academy members gain familiarity with the most current evidence-based practices. These annotations are available on the Academy Website. OBJECTIVE: We identify the 10 most important manuscripts for clinical practice in consultation-liaison psychiatry from 2019. METHODS: Sixty-four abstracts were authored in 2019. Manuscripts were rated on clinical relevance to practice and quality of scholarship. The 10 articles with the highest aggregate scores from 19 raters are described. RESULTS: The resulting articles provide practical guidance for consultation psychiatrists on several topic areas including the treatment of substance use disorders. CONCLUSION: We suggest that these clinical findings should be familiar to all consultation-liaison psychiatrists regardless of practice area. Regular article reviews and summaries help busy clinicians deliver cutting-edge care and maintain a high standard of care across the specialty.
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Trastornos Mentales/terapia , Servicios de Salud Mental/organización & administración , Psiquiatría/organización & administración , Derivación y Consulta , HumanosAsunto(s)
Sobredosis de Droga/complicaciones , Leucoencefalopatías/diagnóstico , Trastornos Mentales/etiología , Encéfalo/diagnóstico por imagen , Encéfalo/patología , Confusión/etiología , Diagnóstico Diferencial , Humanos , Genio Irritable , Leucoencefalopatías/etiología , Leucoencefalopatías/psicología , Imagen por Resonancia Magnética , Masculino , Persona de Mediana EdadRESUMEN
BACKGROUND: Professionalism, although broadly acknowledged to be an important goal of medical education, needs to be taught well. OBJECTIVE: We describe the content selection and structure of an elective professionalism seminar for advanced trainees in psychiatry at the Massachusetts General Hospital. METHOD: We critically evaluate the curriculum content based on participant feedback. RESULTS: We successfully implemented and sustained for 8 years a monthly, 10-session professionalism seminar for advanced trainees in psychiatry. The average number of participants was 4-8 residents or fellows out of a possible 12-16. The curriculum covers 3 broad domains: physicianhood, bioethics, and medical/psychiatric practice. Participants felt that they were more reflective of their practice and that were given a vocabulary to do so. Physician burnout emerged as a key professional concern. CONCLUSION: Professionalism can be taught in a seminar but requires reaching to other disciplines (history of medicine, philosophy, and sociology) to make it meaningful and utile. Consultation-liaison psychiatrists through their interdisciplinary and team-based work are ideally situated to teach professionalism that emphasizes commonalities of psychiatry with the other medical specialties and fosters leadership.
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Internado y Residencia/métodos , Profesionalismo/educación , Psiquiatría/educación , Competencia Clínica , Curriculum , HumanosRESUMEN
Affectively uncomfortable concern, anxiety, indecisionand disputation over 'right' action are among the expressions of moral tension associated with ethical dilemmas. Moral tension is generated and experienced by people. While ethical principles, rules and situations must be worked through in any dilemma, each occurs against a backdrop of people who enact them and stand much to gain or lose depending on how they are applied and resolved. This paper attempts to develop a taxonomy of moral tension based on its intrapersonal and interpersonal sources and expressions. The proposed 'ethics of incongruity' (EoI) outlines ways in which values, actions and needs can find themselves mismatched in morally relevant ways between patients and their clinicians, their own psychologies and their societies. Patient-clinician incongruities may manifest as discord, value misalignment and deception. Patient-patient (ie, intrapersonal) incongruities may manifest as incapacity, akrasia and self-deception. Patient-society incongruities may manifest as disenfranchisement, disaffiliation and disregard. Brief explanations of the incongruities in this scheme are provided, as are suggestions on working within them. Using concepts from moral philosophy when applicable, these suggestions may either ease direct resolution of problems arising from the incongruities, or make sense of the moral tension that arises from the human context of the ethical dilemma at hand. This presentation of content and resolution methods for the EOI is no doubt incomplete. Hopefully, refinement of this preliminary proposal will follow, particularly from clinicians, as the ones who, along with their patients, experience medical ethics in directly tension-inducing ways.
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Toma de Decisiones/ética , Ética Clínica , Relaciones Médico-Paciente/ética , Relaciones Profesional-Familia/ética , Beneficencia , Conflicto Psicológico , Disentimientos y Disputas , Teoría Ética , Humanos , Obligaciones Morales , Principios Morales , Derechos del Paciente/éticaRESUMEN
BACKGROUND: Motor functional neurologic disorders (FND)-previously termed "hysteria" and later "conversion disorder"-are exceedingly common and frequently encountered in the acute hospital setting. Despite their high prevalence, patients with motor FND can be challenging to diagnose accurately and manage effectively. To date, there is limited guidance on the inpatient approach to the neuropsychiatric evaluation of patients with functional (psychogenic) neurologic symptoms. OBJECTIVE: The authors outline an inpatient multidisciplinary approach, involving neurology, psychiatry, and physical therapy, for the assessment and acute inpatient management of motor FND. METHODS: A vignette of a patient with motor FND is presented followed by a discussion of general assessment principles. Thereafter, a detailed description of the neurologic and psychiatric assessments is outlined. Delivery of a "rule-in" diagnosis is emphasized and specific guidance for what can be accomplished postdiagnosis in the hospital is suggested. DISCUSSION: We encourage an interdisciplinary approach beginning at the early stages of the diagnostic assessment once an individual is suspected of having motor FND. CONCLUSIONS: Practical suggestions for the inpatient assessment of motor FND are presented. It is also important to individualize the diagnostic assessment. Future research should be conducted to test best practices for motor FND management in the acute inpatient hospital setting.
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Trastornos de Conversión/diagnóstico , Trastornos de Conversión/psicología , Pacientes Internos , Enfermedades del Sistema Nervioso/diagnóstico , Enfermedades del Sistema Nervioso/psicología , Adulto , Trastornos de Conversión/terapia , Femenino , Humanos , Enfermedades del Sistema Nervioso/terapiaAsunto(s)
Lesiones de Codo , Personas con Mala Vivienda/psicología , Luxaciones Articulares/tratamiento farmacológico , Simulación de Enfermedad/diagnóstico , Trastornos Relacionados con Opioides/psicología , Ideación Suicida , Adulto , Diagnóstico Diferencial , Diagnóstico Dual (Psiquiatría) , Articulación del Codo/diagnóstico por imagen , Femenino , Dependencia de Heroína/psicología , Humanos , Luxaciones Articulares/diagnóstico por imagen , Luxaciones Articulares/terapia , Simulación de Enfermedad/psicología , Oxicodona/uso terapéutico , Radiografía , Intento de Suicidio , Tomografía Computarizada por Rayos XRESUMEN
BACKGROUND: Despite the prevalence with which trainees encounter patients who attempt to manipulate, deceive, or withhold information from them, trainees receive little formal training in "thinking dirty"-that is, incorporating elements of hidden patient motives into their interview, formulation, and plan. Lack of acknowledgment of these aspects of patient care can lead to resident dissatisfaction, negative countertransference reactions, and decreased empathy for patients. METHODS: In this article, the authors outline a multimodal approach used in a large psychiatry training program for teaching trainees to recognize hidden motivations and deception, which involves formal didactic teaching, process rounds, and clinical experience. RESULTS: This approach improves trainee understanding of patients' motivations, and it allows trainees to better regulate their emotional responses to patients withholding information or deceiving them. CONCLUSIONS: Formally addressing this topic in the curriculum can lead to improved patient outcomes and decreased resident burnout, particularly on high-intensity rotations.
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Curriculum , Decepción , Internado y Residencia/métodos , Trastornos Mentales/diagnóstico , Motivación , Psiquiatría/educación , Competencia Clínica , Humanos , Trastornos Mentales/psicologíaRESUMEN
BACKGROUND: Patients with functional somatic syndromes are often difficult to treat. The relationship between doctors and patients can be strained, which limits communication. Instead, patients often communicate with each other over the Internet in electronic support groups. OBJECTIVE: This perspective summarizes studies of patient-to-patient communication over the Internet and uses the concept of contested illness to provide insights into the experiences of patients with functional somatic disorders. DISCUSSION: Conflict between a patient and their physician is a key feature of functional somatic syndromes. Physicians and patients do not have a shared understanding or appreciation of the patient's experiences. Patients with functional somatic syndromes often value their own embodied experience over medical knowledge. At the same time, they remain deeply invested in finding a "good doctor" who believes that the patient is suffering, agrees with their conception of the cause, and assents to the treatment as directed by the patient. Electronic support groups reinforce these beliefs. CONCLUSION: Patients may benefit from a compromising, collaborative approach that is realistic about the limitations of medical knowledge. However, physicians should not engage in unsafe treatment practices. Electronic support groups exist for a wide range of illnesses and the issues that rise to the surface in functional somatic syndromes likely occur to some extent with almost every patient.
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Comunicación , Internet , Relaciones Médico-Paciente , Trastornos Psicofisiológicos/psicología , Grupos de Autoayuda , Conducta Cooperativa , HumanosRESUMEN
BACKGROUND: The 4-abilities model of decision-making capacity is vulnerable to constricted application and teaching. OBJECTIVE: The authors attempt to assert the fundamentally clinical nature of capacity evaluations, while acknowledging that the concept of decision-making capacity must be legally grounded. METHODS: Relevant aspects of clinical care are examined and emphasized as they apply to the evaluation of capacity for medical decision making. RESULTS: Accessing patients' maximal abilities, attending to noncognitive aspects of choice, and identifying diagnostic explanations for patients' difficulties are important components of these assessments. DISCUSSION: The evaluation of medical decision-making capacity is not a purely forensic task; it is enhanced by an approach that bridges the clinical-forensic divide.
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Toma de Decisiones , Competencia Mental/psicología , Psiquiatría Forense , Humanos , Competencia Mental/legislación & jurisprudenciaRESUMEN
BACKGROUND: The amount of literature published annually related to psychosomatic medicine is vast; this poses a challenge for practitioners to keep up-to-date in all but a small area of expertise. OBJECTIVES: To introduce how a group process using volunteer experts can be harnessed to provide clinicians with a manageable selection of important publications in psychosomatic medicine, organized by specialty area, for 2014. METHODS: We used quarterly annotated abstracts selected by experts from the Academy of Psychosomatic Medicine and the European Association of Psychosomatic Medicine in 15 subspecialties to create a list of important articles. RESULTS: In 2014, subspecialty experts selected 88 articles of interest for practitioners of psychosomatic medicine. For this review, 14 articles were chosen. CONCLUSIONS: A group process can be used to whittle down the vast literature in psychosomatic medicine and compile a list of important articles for individual practitioners. Such an approach is consistent with the idea of physicians as lifelong learners and educators.
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Bases de Datos Bibliográficas , Medicina Psicosomática/tendencias , Publicaciones , Procesos de Grupo , HumanosRESUMEN
AIMS AND OBJECTIVES: Substance use-targeted harm reduction (HR) has successfully expanded from public health into clinical settings. Hospital-based providers are in positions to encounter, precipitate and/or mediate ethically fraught situations that can arise around clinical HR-informed interventions. We examine why these situations occur and how they might be better addressed. METHOD: Literature focused on principles, ethics, and clinical implementation of HR are reviewed to identify core elements of this approach. Next, ethical vulnerabilities within those elements are identified and critiqued. A more productive discourse for acknowledging, voicing and addressing ethical dilemmas in HR is sought. RESULTS: Public health orientation and humane concern for substance users, along with a strong anti-stigmatization mission and occasional aversion to a rigid medical model and 'establishment' contributed to HR's successes but can also frame any dissent over its methods as being stigma-fuelled. Practically distilled concepts from moral philosophy and the medical humanities can inform good faith discussions based on common-ground concern for patients. CONCLUSION: HR's use in the general hospital and other clinical settings is a positive development, but one that brings with it new ethical demands. Broader knowledge of the principles of HR, of the application of those principles to the hospital setting, and of common-ground concepts from outside of HR could help facilitate productive ethical engagement around substance-using patients.
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Reducción del Daño , Trastornos Relacionados con Sustancias , Humanos , Trastornos Relacionados con Sustancias/prevención & control , Principios Morales , Filosofía , HospitalesRESUMEN
We present the case of a 23-year-old man with a complex psychiatric history who was transferred from a community hospital for management of agitation and severe thrombocytopenia. Experts in consultation-liaison psychiatry deconstruct the consultation question in this case. The importance of addressing superficial and hidden aspects of a consultation is reviewed via the concepts of explicit, implicit, and tacit consultation questions.
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OBJECTIVE: The purpose of this study was to examine the acute effects of a multi-ingredient, low calorie dietary supplement (MIDS, XTEND® Healthy Hydration) on 5-kilometer (5-km) time trial performance and blood electrolyte concentrations compared to a carbohydrate-electrolyte beverage (CE, GATORADE® Thirst Quencher) and distilled water (W). METHODS: During visit 1 (V1), participants (10 men and 10 women, 20-35 years old, BMI ≤ 29 kg/m2, recreationally active) reported to the laboratory whereby the following tests were performed: i) height and weight measurements, ii) body composition analysis, iii) treadmill testing to measure maximal aerobic capacity, and iv) 5-km time trial familiarization. The second visit (V2) was one week after V1 in the morning (0600 - 0900) and participants arrived 12-14 h fasted (no food or drink). The first battery of assessments (V2-T1) included nude body mass, urine specific gravity (USG), a profile of mood states (POMS) questionnaire, and the completion of a visual analogue scale (VAS) questionnaire to quantify cramping. Then heart rate (HR), blood pressure (BP), total body hydration (via bioelectrical impedance spectroscopy [BIS]) were examined. Finally, a measurement of blood markers via finger stick was performed. Participants consumed a randomized beverage (16 fl. oz. of MIDS, 16 fl. oz. of W, or 16 fl. oz. of CE) within 3 min followed by a 45-min rest. Following the rest period, a second battery (V2-T2) was performed whereby participants' USG was assessed and they completed the POMS and VAS questionnaires, and HR, BP, and blood markers were measured. The participants then performed a 5-km treadmill time trial. Immediately following the 5-km time trial, participants completed a third testing battery (V2-T3) that began with blood markers, HR and BP assessments, followed by nude body weight assessment, and the POMS and VAS questionnaires. After 60 min, a fourth battery (V2-T4) was performed that included HR, BP, and blood markers. After sitting quietly for another 60 min a fifth battery assessment was performed (V2-T5) that included participants' USG, POMS and VAS questionnaires, HR, BP, blood markers, and total body hydration. Visits 3 (V3) and 4 (V4) followed the same protocol except a different randomized drink (16 oz. of CE, MIDS, or W) was consumed; all of which were separated by approximately one week. RESULTS: No differences occurred between conditions for 5-km time trial completion, indirect calorimetry outcomes during 5-km time trials, USG, or nude mass measurements (p > 0.05 for all relevant statistical tests). However, blood potassium and the sodium/potassium ratio displayed significant interactions (p < 0.05), and post hoc testing indicated these values were better maintained in the MIDS versus other conditions. Post-exercise cramp prevalence was greater in the CE (p < 0.05) and trended higher with W (p = 0.083) compared to the MIDS condition. Post-exercise cramp severity was also elevated with the W and CE beverages (p < 0.05) but not the MIDS (p = 0.211). CONCLUSIONS: The MIDS did not affect 5-km time trial performance but exhibited favorable effects on blood electrolyte and post-exercise self-reporting cramp outcomes compared to the CE and W drinks.
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Equilibrio Hidroelectrolítico , Agua , Adulto , Femenino , Humanos , Masculino , Adulto Joven , Aminoácidos , Bebidas , Carbohidratos de la Dieta/farmacología , Electrólitos , Calambre Muscular , Potasio , Distribución AleatoriaRESUMEN
The skeletal muscle proteome alterations to aging and resistance training have been reported in prior studies. However, conventional proteomics in skeletal muscle typically yields wide protein abundance ranges that mask the detection of lowly expressed proteins. Thus, we adopted a novel deep proteomics approach whereby myofibril (MyoF) and non-MyoF fractions were separately subjected to protein corona nanoparticle complex formation prior to digestion and Liquid Chromatography Mass Spectrometry (LC-MS). Specifically, we investigated MyoF and non-MyoF proteomic profiles of the vastus lateralis muscle of younger (Y, 22±2 years old; n=5) and middle-aged participants (MA, 56±8 years old; n=6). Additionally, MA muscle was analyzed following eight weeks of resistance training (RT, 2d/week). Across all participants, the number of non-MyoF proteins detected averaged to be 5,645±266 (range: 4,888-5,987) and the number of MyoF proteins detected averaged to be 2,611±326 (range: 1,944-3,101). Differences in the non-MyoF (8.4%) and MyoF (2.5%) proteomes were evident between age cohorts, and most differentially expressed non-MyoF proteins (447/543) were more enriched in MA versus Y. Biological processes in the non-MyoF fraction were predicted to be operative in MA versus Y including increased cellular stress, mRNA splicing, translation elongation, and ubiquitin-mediated proteolysis. RT in MA participants only altered ~0.3% of MyoF and ~1.0% of non-MyoF proteomes. In summary, aging and RT predominantly affect non-contractile proteins in skeletal muscle. Additionally, marginal proteome adaptations with RT suggest more rigorous training may stimulate more robust effects or that RT, regardless of age, subtly alters basal state skeletal muscle protein abundances.
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Envejecimiento , Músculo Esquelético , Proteómica , Entrenamiento de Fuerza , Humanos , Envejecimiento/metabolismo , Envejecimiento/genética , Persona de Mediana Edad , Proteómica/métodos , Masculino , Adulto Joven , Músculo Esquelético/metabolismo , Proteoma/metabolismo , Proteínas Musculares/metabolismo , Proteínas Musculares/genética , Adulto , FemeninoRESUMEN
BACKGROUND: Psychiatric consultations involving the evaluation of patients' medical decision-making capacity often seem to have little to do with truly compromised patient autonomy. OBJECTIVE: The authors seek to examine hidden ethical dilemmas that lead to capacity evaluation requests. METHOD: The authors utilize the "principlism" approach to biomedical ethics to illustrate some common moral issues in patient care that are poorly captured by the "autonomy-versus-paternalism" paradigm. RESULTS: Patient autonomy sometimes comes into conflict with ethical imperatives to do "good," to avoid harm, and to deliver care fairly, as well as with the autonomy of others. Consultation psychiatrists are well positioned to unearth these dilemmas and begin to address them. DISCUSSION: Effective engagement of everyday ethics in clinical medicine is hindered by reflexive resort to capacity evaluations when moral problems arise. Greater attention to matters of values, aggressive urges, and obligations to others can enhance the negotiation of routine ethical dilemmas.
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Bioética , Toma de Decisiones/ética , Consentimiento Informado/ética , Competencia Mental/psicología , Autonomía Personal , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Consentimiento Informado/psicología , Masculino , Paternalismo/ética , Derechos del Paciente/ética , Ética Basada en Principios , Derivación y ConsultaRESUMEN
Recognizing that very few potential reviewers and authors receive formal training on peer review, we provide guidance on peer reviewing manuscripts and on being responsive to reviewer comments. Peer review provides benefits to all parties involved. Serving as a peer reviewer gives perspective on the editorial process, fosters relationships with journal editors, gives insights into novel research, and provides a means of demonstrating topical expertise. When responding to peer reviewers, authors have the opportunity to strengthen the manuscript, sharpen the message, and address areas of potential misunderstanding. First, we provide guidance on how to peer review a manuscript. Reviewers should consider the importance of the manuscript, its rigor, and clarity of presentation. Reviewer comments should be as specific as possible. They should also be constructive and respectful in tone. Reviews typically include a list of major comments focused on methodology and interpretation and may also include a list of minor comments that pinpoint specific areas of clarification. Opinions expressed as comments to the editor are confidential. Second, we provide guidance on being responsive to reviewer comments. Authors are encouraged to approach reviewer comments as a collaboration and to view this exercise as an opportunity to strengthen their work. Response comments should be presented respectfully and systematically. The author's goal is to signal that they have engaged directly and thoughtfully with each comment. In general, when an author has questions regarding reviewer comments or how to respond, they are invited to contact the editor to review.
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Actitud , Revisión por Pares , Revisión por Pares/métodos , RespetoRESUMEN
OBJECTIVE: COVID-19 conspiracy theories have become widespread since the onset of the pandemic and compound the existing challenges of decisional capacity assessment. This paper aims to review the literature pertaining to decisional capacity assessment in the context of COVID-19 conspiracy beliefs and synthesize a practical approach with an emphasis on differential diagnosis and clinical pearls for the practicing physician. METHODS: We reviewed papers on decisional capacity assessment and differential diagnosis in the context of COVID-19 conspiracy beliefs. A literature search was conducted using the US National Library of Medicine's PubMed.gov resource and Google Scholar. RESULTS: The resulting article content was utilized to synthesize a practical approach to decisional capacity assessment in the context of COVID-19 conspiracy beliefs. Specifically, aspects related to the history, taxonomy, evaluation, and management are reviewed. CONCLUSIONS: Appreciating the nuanced differences between delusions, overvalued ideas, and obsessions while with integrating the non-cognitive domains of capacity into the assessment are crucial to navigating the wide differential diagnosis of COVID-19 conspiracy beliefs. It is important to attempt to clarify and optimize patient decision-making abilities by addressing circumstances, attitudes, and cognitive styles specific to patients with seemingly irrational beliefs about COVID-19.
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COVID-19 , Médicos , Estados Unidos , Humanos , Diagnóstico Diferencial , Pandemias , Personalidad , Prueba de COVID-19RESUMEN
We determined if skeletal muscle extracellular matrix (ECM) content and remodeling markers adapted with resistance training or were associated with hypertrophic outcomes. Thirty-eight untrained males (21 ± 3 yr) participated in whole body resistance training (10 wk, 2 × weekly). Participants completed testing [ultrasound, peripheral quantitative computed tomography (pQCT)] and donated a vastus lateralis (VL) biopsy 1 wk before training and 72 h following the last training bout. Higher responders (HR, n = 10) and lower responders (LR, n = 10) were stratified based on a composite score considering changes in pQCT-derived mid-thigh cross-sectional area (mCSA), ultrasound-derived VL thickness, and mean fiber cross-sectional area (fCSA). In all participants, training reduced matrix metalloprotease (MMP)-14 protein (P < 0.001) and increased satellite cell abundance (P < 0.001); however, VL fascial thickness, ECM protein content per myofiber, MMP-2/-9 protein content, tissue inhibitor of metalloproteinase (TIMP)-1/-2 protein content, collagen-1/-4 protein content, macrophage abundance, or fibroadipogenic progenitor cell abundance were not altered. Regarding responder analysis, MMP-14 exhibited an interaction (P = 0.007), and post hoc analysis revealed higher protein content in HR versus LR before training (P = 0.026) and a significant decrease from pre to posttraining in HR only (P = 0.002). In summary, basal skeletal muscle ECM markers are minimally affected with 10 wk of resistance training, and these findings could be related to not capturing more dynamic alterations in the assayed markers earlier in training. However, the downregulation in MMP-14 in college-aged men classified as HR is a novel finding and warrants continued investigation, and further research is needed to delineate muscle connective tissue strength attributes between HR and LR.NEW & NOTEWORTHY Although past studies have examined aspects of extracellular matrix remodeling in relation to mechanical overload or resistance training, this study serves to expand our knowledge on a multitude of extracellular matrix markers and whether these markers adapt to resistance training or are associated with differential hypertrophic responses.
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Entrenamiento de Fuerza , Masculino , Humanos , Adulto Joven , Entrenamiento de Fuerza/métodos , Metaloproteinasa 14 de la Matriz/metabolismo , Músculo Esquelético/fisiología , Matriz Extracelular/metabolismo , Músculo Cuádriceps/metabolismo , Inhibidor Tisular de Metaloproteinasa-1/metabolismo , Hipertrofia/metabolismoRESUMEN
Objective: To characterize the socio-demographics and comorbid medical and psychiatric diagnoses of patients in the general hospital diagnosed with malingering. Method: We conducted a retrospective observational cohort study using data from the 2019 National Inpatient Sample, an all-payors database of acute care general hospital discharges in the United States, querying for patients aged 18 and older discharged with a diagnosis of "malingerer [conscious simulation]," ICD-10 code Z76.5. Results: 45,645 hospitalizations (95% CI: 43,503 to 47,787) during the study year included a discharge diagnosis of malingering. 56.1% were for male patients, and the median age was 43 years (IQR 33 to 54). Black patients represented 26.8% of the patients with a discharge diagnosis of malingering, compared to 14.9% of all patients sampled. Zip codes in the lowest household income quartile comprised 39.9% of malingering diagnoses. The top categories of primary discharge diagnoses of hospitalizations included medical ("Diabetes mellitus without complications"), psychiatric ("Depressive disorders"), and substance use ("Alcohol-related disorders") disorders. "Sepsis, unspecified organism," was the most common primary diagnosis. Conclusion: The striking overrepresentation of Black patients in hospitalizations with diagnosis of malingering raises concern about the roles of implicit and systemic biases in assigning this label. The disproportionate number of patients of low socioeconomic status is further suggestive of bias and disparity. Another potential contribution is that the lower health literacy in these populations results in a limited knowledge of traditional ways to meet one's needs and thus greater reliance on malingered behavior as an alternative means. Accurate description of these patients' socio-demographics and comorbid medical and psychiatric diagnoses with reliable data from large samples can lead to improved understanding of how the malingering label is applied and ultimately better patient care.