The Impact of the City of Miami's Decision to Revoke Electric Scooter Company Permits on Orthopedic Trauma at a Level I Trauma Center.

BACKGROUND: Since the introduction of electric-scooter (e-scooter) mobile applications, there has been a marked increase in e-scooter-related injury. On January 19, 2022, the City of Miami revoked permits to five major mobile applications for violation of safety protocols. OBJECTIVES: The purpose of our study was to assess the effects of this notice on the orthopedic patients seen at our corresponding Level I trauma center. METHODS: Institutional Review Board approval was obtained for this study. A retrospective chart review was performed including all patients with orthopedic injuries at our Level I trauma center between July 19, 2021 and July 19, 2022. These dates include 6 months prior to and after the major e-scooter operators ceased use in Miami. SPSS statistical software version 28.0.0 (SPSS, IBM, Armonk, NY) was utilized for all statistical analysis. RESULTS: There were 2558 patients in the prenotice cohort, and 2492 patients in the postnotice cohort. After the notice, there was a significant decrease in the number of patients that presented to our institution due to injuries caused by e-scooters (2.8% vs. 1.8% patients; p = 0.021). Patients with injuries caused by e-scooters had a significantly lower age (38 vs. 42, respectively; p = 0.034) and were more likely to be male (79.3% vs. 67.4% male, respectively; p = 0.007) than patients with other orthopedic injuries. CONCLUSION: This study demonstrates that the 2022 notice revoking the major mobile application operators from the City of Miami resulted in a significant decrease in the number of orthopedic cases due to e-scooter-related injury at the corresponding Level I trauma center.

Nailing precision: a systematic review and meta-analysis of randomized controlled trials comparing piriformis and trochanteric entry points for femoral antegrade nailing.

INTRODUCTION: Entry point selection, a crucial aspect of femoral antegrade nailing, can impact nail fit and consequently fracture reduction. In adults, the standard entry portals used are the piriformis fossa and the tip of the greater trochanter. Previous systematic reviews comparing the two techniques have not been limited to Randomized Controlled Trials (RCTs) and have not consistently included the same available RCTs. MATERIALS AND METHODS: A systematic search of comparative studies regarding entry portal selection in femoral antegrade nailing was conducted on seven databases. Only Prospective RCTs comparing trochanteric and piriformis entry in the management of trochanteric or diaphyseal femur fractures were eligible for inclusion. RESULTS: Ultimately, only 6 RCTs were found eligible for inclusion. Five of the six included studies reported on operative time. The resulting mean difference (MD) illustrated a significant decrease in operative time by approximately 21.26 min (95% CI - 28.60 to - 13.92, p < 0.001) using trochanteric entry. Fluoroscopy exposure was reported on by four studies, however, only two studies were included in the analysis due to different reporting methods. Trochanteric entry used significantly less fluoroscopy than piriformis entry (MD -50.33 s, 95% CI - 84.441 to - 16.22, p = 0. 004). No significant difference in malalignment rates, delayed union rates, nonunion rates, pain scores, or complication rates was found. CONCLUSION: The significant differences found in operating time and fluoroscopy time align with those in other studies. While we were not able to pool the data on functional outcome scores, none of the included studies found a significant difference in scores by their last follow-up. Both approaches demonstrate comparable functional outcomes and safety profiles, indicating the choice of entry point should be at the discretion of the surgeon based on technique familiarity and fracture characteristics.

Oleaginous yeasts for biochemicals, biofuels and food from lignocellulose-hydrolysate and crude glycerol.

Microbial lipids produced from lignocellulose and crude glycerol (CG) can serve as sustainable alternatives to vegetable oils, whose production is, in many cases, accompanied by monocultures, land use changes or rain forest clearings. Our projects aim to understand the physiology of microbial lipid production by oleaginous yeasts, optimise the production and establish novel applications of microbial lipid compounds. We have established methods for fermentation and intracellular lipid quantification. Following the kinetics of lipid accumulation in different strains, we found high variability in lipid formation even between very closely related oleaginous yeast strains on both, wheat straw hydrolysate and CG. For example, on complete wheat straw hydrolysate, we saw that one Rhodotorula glutinis strain, when starting assimilating D-xylosealso assimilated the accumulated lipids, while a Rhodotorula babjevae strain could accumulate lipids on D-xylose. Two strains (Rhodotorula toruloides CBS 14 and R. glutinis CBS 3044) were found to be the best out of 27 tested to accumulate lipids on CG. Interestingly, the presence of hemicellulose hydrolysate stimulated glycerol assimilation in both strains. Apart from microbial oil, R. toruloides also produces carotenoids. The first attempts of extraction using the classical acetone-based method showed that ß-carotene is the major carotenoid. However, there are indications that there are also substantial amounts of torulene and torularhodin, which have a very high potential as antioxidants.

Supplemental musculoskeletal anatomy education in a shortened medical school curriculum.

To address anatomy knowledge gaps exacerbated by the education constraints of a new shortened medical school curriculum and the COVID-19 pandemic, the Orthopedic Surgery Interest Group (OSIG) created a novel hybrid anatomy curriculum for students interested in orthopedic surgery. The main objectives were to determine (1) Does this elective supplement to the curriculum improve students' perceived confidence with regard to orthopedic anatomy? (2) What are the students' preferred formats for receiving this elective supplement to the curriculum? To determine this, we used a prospective study design to determine the impact of the OSIG's student-led hybrid anatomy sessions. A survey with a five-point Likert scale (1) Strongly disagree; (2) Disagree; (3) Neither agree nor disagree; (4) Agree; (5) Strongly agree; was used to quantify responses. Chi-squared tests, Fisher's exact tests and T-tests were used when appropriate. Our results show that participants without prior anatomy experience rated the course higher on average when compared with those with prior anatomy experience (4.27 vs. 3.67, respectively; p = 0.168). Most students (88.2%) prefer for anatomy sessions to be held more frequently and 76.4% enjoyed having virtual components. 82.4% of participants reported that this course improved their self-confidence regarding orthopedic anatomy, and 100% would recommend it to other students. Most students enjoyed the course and reported improved self-perceived anatomy knowledge after participating. Medical schools that have a shortened anatomy curriculum can consider using the present study as a model for an optional musculoskeletal anatomy supplement at their institution.

The Synthesis of Novel aza-Steroids and α, ß-Unsaturated-Cyanoketone from Diosgenin.

Recent studies have demonstrated the antiproliferative and cytotoxic effects of aza-steroids and steroidal sapogenins on human cancer cell lines. The scientific community has shown a growing interest in these compounds as drug candidates for cancer treatment. In the current work, we report the synthesis of new diosgenin oxime derivatives as potential antiproliferative agents. From (25 R)-5α-spirost-3,5,6-triol (1), a diosgenin derivative, ketones 2, 3, 4, and 9 were obtained and used as precursors of the new oximes. A condensation reaction was carried out between the steroidal ketones (2, 3, 4, and 9) with hydroxylamine hydrochloride in 2,4,6-trimethylpyridine to produce five spirostanic oximes (four of them are not reported before) with a 42-96% yield. Also, a new spirostanic α, ß-unsaturated cyanoketone was synthesized via Beckmann fragmentation using thionyl chloride with a 62% yield. Furthermore, we proposed a reaction mechanism with the aim of explaining such transformation.

The Choice between Intravenous and Subcutaneous Immunoglobulins: Aspects for Consideration.

BACKGROUND: Intravenous immunoglobulin and subcutaneous immunoglobulin preparations are used to treat primary and secondary immunodeficiencies, as well as autoimmune and inflammatory conditions. SUMMARY: For certain indications, only defined formulations or routes of administration are approved by health authorities. However, for other diseases, there are more options, and treatment decisions may be based on different aspects, such as patient conditions and preferences, pharmacokinetics, or pharmacoeconomic considerations. KEY MESSAGES: Understanding the two different treatment modalities may support the decision-making for the optimal therapeutic option for individual patients. This review summarizes the latest insights into the direct and indirect comparison between the two types of products.

Chromosome-level genome assembly and transcriptome-based annotation of the oleaginous yeast Rhodotorula toruloides CBS 14.

Rhodotorula toruloides is an oleaginous yeast with high biotechnological potential. In order to understand the molecular physiology of lipid synthesis in R. toruloides and to advance metabolic engineering, a high-resolution genome is required. We constructed a genome draft of R. toruloides CBS 14, using a hybrid assembly approach, consisting of short and long reads generated by Illumina and Nanopore sequencing, respectively. The genome draft consists of 23 contigs and 3 scaffolds, with a N50 length of 1,529,952 bp, thus largely representing chromosomal organization. The total size of the genome is 20,534,857 bp and the overall GC content is 61.83%. Transcriptomic data from different growth conditions was used to aid species-specific gene annotation. We annotated 9464 genes and identified 11,691 transcripts. Furthermore, we demonstrated the presence of a potential plasmid, an extrachromosomal circular structure of about 11 kb with a copy number about three times as high as the other chromosomes.

Prophylactic Radiotherapy for Prevention of Heterotopic Ossification After Periacetabular Fractures: A Review of Efficacy and Associated Conditions.

Prophylactic radiotherapy (XRT) is a commonly used treatment to decrease heterotopic ossification (HO) in patients with traumatic hip injuries. We conducted a retrospective review of patients at risk for HO who underwent XRT. Of the patients reviewed, 27.3% developed radiographic HO, 11.2% developed symptoms, and 2.0% required resection surgery. Patients were divided into primary (n = 71) and secondary prophylaxis (n = 27) cohorts. In the primary group, 25.0% developed radiographic HO, 5.6% developed symptoms, and 0 required surgery. In the secondary cohort, 33.3% of patients developed new radiographic HO, and 25.9% were symptomatic: four had a Brooker score of 3, and three had a score of 4 (p = 0.03), and 7.4% required surgical resection. (Journal of Surgical Orthopaedic Advances 31(2):113-118, 2022).

The ClpS adaptor mediates staged delivery of N-end rule substrates to the AAA+ ClpAP protease.

The ClpS adaptor delivers N-end rule substrates to ClpAP, an energy-dependent AAA+ protease, for degradation. How ClpS binds specific N-end residues is known in atomic detail and clarified here, but the delivery mechanism is poorly understood. We show that substrate binding is enhanced when ClpS binds hexameric ClpA. Reciprocally, N-end rule substrates increase ClpS affinity for ClpA(6). Enhanced binding requires the N-end residue and a peptide bond of the substrate, as well as multiple aspects of ClpS, including a side chain that contacts the substrate α-amino group and the flexible N-terminal extension (NTE). Finally, enhancement also needs the N domain and AAA+ rings of ClpA, connected by a long linker. The NTE can be engaged by the ClpA translocation pore, but ClpS resists unfolding/degradation. We propose a staged-delivery model that illustrates how intimate contacts between the substrate, adaptor, and protease reprogram specificity and coordinate handoff from the adaptor to the protease.

Remodeling of a delivery complex allows ClpS-mediated degradation of N-degron substrates.

The ClpS adaptor collaborates with the AAA+ ClpAP protease to recognize and degrade N-degron substrates. ClpS binds the substrate N-degron and assembles into a high-affinity ClpS-substrate-ClpA complex, but how the N-degron is transferred from ClpS to the axial pore of the AAA+ ClpA unfoldase to initiate degradation is not known. Here we demonstrate that the unstructured N-terminal extension (NTE) of ClpS enters the ClpA processing pore in the active ternary complex. We establish that ClpS promotes delivery only in cis, as demonstrated by mixing ClpS variants with distinct substrate specificity and either active or inactive NTE truncations. Importantly, we find that ClpA engagement of the ClpS NTE is crucial for ClpS-mediated substrate delivery by using ClpS variants carrying "blocking" elements that prevent the NTE from entering the pore. These results support models in which enzymatic activity of ClpA actively remodels ClpS to promote substrate transfer, and highlight how ATPase/motor activities of AAA+ proteases can be critical for substrate selection as well as protein degradation.

The molecular basis of N-end rule recognition.

The N-end rule targets specific proteins for destruction in prokaryotes and eukaryotes. Here, we report a crystal structure of a bacterial N-end rule adaptor, ClpS, bound to a peptide mimic of an N-end rule substrate. This structure, which was solved at a resolution of 1.15 A, reveals specific recognition of the peptide alpha-amino group via hydrogen bonding and shows that the peptide's N-terminal tyrosine side chain is buried in a deep hydrophobic cleft that pre-exists on the surface of ClpS. The adaptor side chains that contact the peptide's N-terminal residue are highly conserved in orthologs and in E3 ubiquitin ligases that mediate eukaryotic N-end rule recognition. We show that mutation of critical ClpS contact residues abrogates substrate delivery to and degradation by the AAA+ protease ClpAP, demonstrate that modification of the hydrophobic pocket results in altered N-end rule specificity, and discuss functional implications for the mechanism of substrate delivery.

"Sawbones": A pilot study assessing simulation-based orthopedic training for medical students.

Intro: Simulation-based training has become a valuable new tool in medical education across the country. The Orthopedic Surgery Interest Group (OSIG) at the University of Miami Miller School of Medicine organized a benchtop training workshop known as "Sawbones" to give medical students essential exposure to basic techniques and instruments commonly used in orthopedic surgery. This pilot study seeks to investigate the participating students' perceptions of this workshop as part of a potential longitudinal intervention. Methods: A total of 30 medical students (MS1-MS4) with a documented interest in orthopedic surgery were randomly selected via email invitation to participate in this workshop. Students first had a lecture-based training session with faculty on an overview of screw fixation. Participants then formed groups that were headed by an orthopedic resident or attending and took turns fixing fractures on model bones made of synthetic material. Following the session, students were sent an anonymous Qualtrics survey to assess their satisfaction with the workshop. Results: A total of 22 students (73%), responded to the survey. On a ten-point scale, the average reported interest in orthopedics was 9.2 (SD 0.4). All students (n = 22, 100%) reported that they would like more hands-on orthopedic experiences as a component of their medical education. Nineteen students (86.4%) reported that this training increased their interest in pursuing a career in orthopedic surgery and twenty-one (95.5%) further stated that they would recommend this training to other students. Discussion: Based on the results of this pilot study, Sawbones was promising at engaging students in orthopedics, providing a team environment, and introducing students to orthopedic skills and instrumentation. Providing these sessions in a longitudinal manner could provide opportunities for mentorship and better prepare students for a residency in orthopedics. We recommend a program like Sawbones to better address the lack of Orthopedic exposure in medical school.

The impacts of anxiety and depression on outcomes in orthopaedic trauma surgery: a narrative review.

Introduction: The impact of anxiety and depression on outcomes in orthopaedic trauma surgery is a topic of growing research interest. Patients and methods: Orthopaedic trauma patients often experience high rates of psychiatric disorders, with anxiety and depression being the most prevalent. Mental health disorders have been shown to increase the risk of negative surgical outcomes and morbidity. This narrative review seeks to summarize the current literature surrounding the impacts of anxiety and depression on orthopaedic trauma surgery outcomes. Discussion: There is a bidirectional relationship between chronic pain and mental health disorders, involving overlapping brain regions and neurotransmitter pathways. Anxiety and depression have been identified as predictors of negative surgical outcomes in orthopaedic trauma patients. Screening tools like the Patient Health Questionnaire-9 (PHQ-9), Generalized Anxiety Disorder Screener-7 (GAD-7), and Medical Outcomes Study 36-item Short Form (SF-36) can assess mental health status and help tailor interventions. Psychological distress, chronic pain, and traumatic limb amputation are factors that contribute to adverse mental health outcomes in orthopaedic trauma patients. Opioid use for pain management is common in orthopaedic surgery, but it can worsen symptoms of depression and lead to dependency. Non-opioid pain management strategies may improve postoperative outcomes by reducing the impact of opioid-exacerbated depression. Conclusion: Mental health interventions, both preoperative and postoperative, are crucial in optimizing surgical outcomes and improving patient quality of life. Multidisciplinary approaches that address both physical and mental health are recommended for orthopaedic trauma patients. Further research is needed to develop effective interventions for improving mental health outcomes in this patient population.

Enhanced glycerol assimilation and lipid production in Rhodotorula toruloides CBS14 upon addition of hemicellulose primarily correlates with early transcription of energy-metabolism-related genes.

BACKGROUND: Lipid formation from glycerol was previously found to be activated in Rhodotorula toruloides when the yeast was cultivated in a mixture of crude glycerol (CG) and hemicellulose hydrolysate (CGHH) compared to CG as the only carbon source. RNA samples from R. toruloides CBS14 cell cultures grown on either CG or CGHH were collected at different timepoints of cultivation, and a differential gene expression analysis was performed between cells grown at a similar physiological situation. RESULTS: We observed enhanced transcription of genes involved in oxidative phosphorylation and enzymes localized in mitochondria in CGHH compared to CG. Genes involved in protein turnover, including those encoding ribosomal proteins, translation elongation factors, and genes involved in building the proteasome also showed an enhanced transcription in CGHH compared to CG. At 10 h cultivation, another group of activated genes in CGHH was involved in ß-oxidation, handling oxidative stress and degradation of xylose and aromatic compounds. Potential bypasses of the standard GUT1 and GUT2-glycerol assimilation pathway were also expressed and upregulated in CGHH 10 h. When the additional carbon sources from HH were completely consumed, at CGHH 36 h, their transcription decreased and NAD+-dependent glycerol-3-phosphate dehydrogenase was upregulated compared to CG 60 h, generating NADH instead of NADPH with glycerol catabolism. TPI1 was upregulated in CGHH compared to cells grown on CG in all physiological situations, potentially channeling the DHAP formed through glycerol catabolism into glycolysis. The highest number of upregulated genes encoding glycolytic enzymes was found after 36 h in CGHH, when all additional carbon sources were already consumed. CONCLUSIONS: We suspect that the physiological reason for the accelerated glycerol assimilation and faster lipid production, was primarily the activation of enzymes that provide energy.

Molecular basis of substrate selection by the N-end rule adaptor protein ClpS.

The N-end rule is a conserved degradation pathway that relates the stability of a protein to its N-terminal amino acid. Here, we present crystal structures of ClpS, the bacterial N-end rule adaptor, alone and engaged with peptides containing N-terminal phenylalanine, leucine, and tryptophan. These structures, together with a previous structure of ClpS bound to an N-terminal tyrosine, illustrate the molecular basis of recognition of the complete set of primary N-end rule amino acids. In each case, the alpha-amino group and side chain of the N-terminal residue are the major determinants of recognition. The binding pocket for the N-end residue is preformed in the free adaptor, and only small adjustments are needed to accommodate N-end rule residues having substantially different sizes and shapes. M53A ClpS is known to mediate degradation of an expanded repertoire of substrates, including those with N-terminal valine or isoleucine. A structure of Met53A ClpS engaged with an N-end rule tryptophan reveals an essentially wild-type mechanism of recognition, indicating that the Met(53) side chain directly enforces specificity by clashing with and excluding beta-branched side chains. Finally, experimental and structural data suggest mechanisms that make proteins with N-terminal methionine bind very poorly to ClpS, explaining why these high-abundance proteins are not degraded via the N-end rule pathway in the cell.

Post-Pandemic Telehealth Policy for Primary Care: An Equity Perspective.

National telehealth policy thus far has focused on broadening access to service, specialties, and originating sites. Yet telehealth policy can further equity by providing system-level change needed to reduce structural determinants that hamper telehealth access in historically marginalized, low income, and limited English-speaking populations. The authors propose policy solutions for states and CMS to help address these structural determinants of telehealth care. A telehealth "ecosystem" grounded in the following core components would ensure equitable access to care: use of technology inclusive of economically marginalized patients, access to the technology and broadband for completing virtual visits, and concrete support for patients as they develop their digital and telehealth skills.

Near Chromosome-Level Genome Assembly and Annotation of Rhodotorula babjevae Strains Reveals High Intraspecific Divergence.

The genus Rhodotorula includes basidiomycetous oleaginous yeast species. Rhodotorula babjevae can produce compounds of biotechnological interest such as lipids, carotenoids, and biosurfactants from low value substrates such as lignocellulose hydrolysate. High-quality genome assemblies are needed to develop genetic tools and to understand fungal evolution and genetics. Here, we combined short- and long-read sequencing to resolve the genomes of two R. babjevae strains, CBS 7808 (type strain) and DBVPG 8058, at chromosomal level. Both genomes are 21 Mbp in size and have a GC content of 68.2%. Allele frequency analysis indicates that both strains are tetraploid. The genomes consist of a maximum of 21 chromosomes with a size of 0.4 to 2.4 Mbp. In both assemblies, the mitochondrial genome was recovered in a single contig, that shared 97% pairwise identity. Pairwise identity between most chromosomes ranges from 82 to 87%. We also found indications for strain-specific extrachromosomal endogenous DNA. A total of 7591 and 7481 protein-coding genes were annotated in CBS 7808 and DBVPG 8058, respectively. CBS 7808 accumulated a higher number of tandem duplications than DBVPG 8058. We identified large translocation events between putative chromosomes. Genome divergence values between the two strains indicate that they may belong to different species.

Meeting them where they are on the web: addressing structural barriers for Latinos in telehealth care.

As we enter an era of health care that incorporates telehealth for routine provision of care, we can build a system that consciously and proactively includes vulnerable patients, thereby avoiding further exacerbation of health disparities. A practical way to reach out to Latino patients is to use media they already widely use. Rather than expect patients to adapt to suboptimal systems of telehealth care, we can improve telehealth for Latinos by using platforms already familiar to them and thereby refocus telehealth delivery systems to provide patient-centered care. Such care is responsive to patients' needs and preferences; for Latinos, this includes using digital devices that they actually own (ie, smartphones). Equity-centered telehealth is accessible for all, regardless of linguistic, literacy, and socioeconomic barriers.

USO DE RÚBRICAS PARA LA EVALUACIÓN DE TEXTOS ACADÉMICOS: UN DESAFÍO EN LA ENSEÑANZA DE ENFERMERÍA / USE OF RUBRICS FOR THE EVALUATION OF ACADEMIC TEXTS: A CHALLENGE IN NURSING EDUCATION

INTRODUCCIÓN: Tanto la enseñanza de la escritura como la forma en que se evalúa constituyen un desafío importante en educación superior. La utilización de estrategias evaluativas permite remediar las carencias en habilidades de escritura, al ser no solo un recurso de evaluación exhaustivo y didáctico, sino que también, una guía para el desarrollo del texto en sí mismo. OBJETIVO: Desarrollar metodologías evaluativas para mejorar los aspectos de forma y contenido en la escritura de textos académicos en Enfermería. METODOLOGÍA: el proyecto contó de tres fases que contemplaron la construcción de dos instrumentos (fase 1), su aplicación en un texto académico y respectivos ajustes (fase 2), y la evaluación de dicha aplicación (fase 3). RESULTADOS: se obtuvieron dos rúbricas de tipo analíticas conformadas por los ítems de FORMA (aspectos de escritura) y CONTENIDO (aspectos de investigación), las que fueron aplicadas tres veces al texto para evaluar su progreso, observándose mejoras en la calificación global, en coherencia y cohesión en FORMA, y marco teórico, resultados y metodología, en CONTENIDO. DISCUSIÓN: el uso de rúbricas analíticas son una herramienta muy útil a la hora de evaluar textos académicos. Son instrumentos sumamente completos pues miran el proceso como un todo, actuando no solo como una instancia evaluativa, sino que también formadora para el estudiantado, a la vez que se configuran como una guía para el desarrollo de la escritura.

INTRODUCTION: Both the teaching of writing and the way it is evaluated constitute major challenges in higher education. The use of evaluative strategies can help remediate deficiencies in writing skills by being not only an exhaustive and didactic evaluation resource, but also a guide for the development of the text itself. OBJECTIVE: Develop evaluative methodologies to improve aspects of form and content in the writing of academic texts in Nursing. METHODOLOGY: The project had three phases that considered the construction of two instruments (phase 1), their application in an academic text (thesis report) and respective adjustments (phase 2), and, finally, the evaluation of said application. RESULTS: Two analytical headings were obtained (quantitative methodology and qualitative methodology), consisting of the items of FORM (writing aspects) and CONTENT (research aspects), respectively, which were applied three times to the text to evaluate its progress. Improvements were observed in the overall rating, in the areas of coherence and cohesion in FORM, and in the theoretical framework, results, and methodology in CONTENT. DISCUSSION: Analytical rubrics are a very useful tool when evaluating academic texts. They are extremely comprehensive instruments because they look at the process as a whole, serving not only as an evaluative tool, but also as a training opportunity for students, providing a guide for the development of academic writing skills.

Conversaciones sobre brigadas médicas cubanas en contexto de COVID-19 desde el ambiente info-comunicativo de Twitter / Conversations on Cuban medical delegations in the context of COVID-19 from the info-communicative environment on Twitter

Introducción: La pandemia de COVID-19 modifica el ambiente info-comunicativo de los ciberusuarios. Cuba, en particular, presenta un nivel considerable de desarrollo tecnológico insertado en la plataforma social de Internet, Twitter. Este soporte desempeña un rol vertebral para el debate sobre temas relacionados a las brigadas médicas cubanas, por su enfrentamiento al virus en el ámbito internacional, que coadyuva a la conformación de una opinión global favorable. Lo planteado con anterioridad se expresa desde las conversaciones online y sus discursos en este sitio. Objetivo: Caracterizar el ambiente info-comunicativo de Twitter durante las conversaciones online sobre brigadas médicas cubanas, entre el 31 de diciembre de 2020 y el 18 de enero de 2021. Material y Métodos: Se emplea el método teórico hermenéutico, para la descripción de los resultados del procesamiento estadístico de contenido, estructura y uso en la web, correspondiente a un enfoque transdisciplinar, mediante la técnica de minería de datos y la aplicación como instrumento del algoritmo no supervisado SSA-UO para el análisis de sentimientos en Twitter. Resultados: Las características del ambiente info-comunicativo de Twitter durante las conversaciones online sobre brigadas médicas cubanas evidencian un predominio de la polaridad positiva. Conclusiones: Los retuits, las menciones y la publicación de enlaces condicionan las particularidades del debate sobre el tema en la esfera de microblogging(AU)

Introduction: The COVID-19 pandemic modifies the info-communicative environment of cyber users. Cuba, in particular, presents a remarkable level of technological development inserted in the Internet social platform, Twitter. This support plays a key role in the debate about issues related to the Cuban medical delegations due to their confrontation with the virus at the international level, which contributes to the formation of a favorable global opinion. The aforementioned point is expressed from the online conversations and their speeches in this site. Objective: To characterize the info-communicative environment on Twitter during the online conversations about Cuban medical brigades between December 31, 2020 and January 18, 2021. Material and Methods: The hermeneutic theoretical method is used for the description of the results of the statistical processing of content, structure and use on the Web, corresponding to a transdisciplinary approach through the application of Data Mining Technique as an instrument of the unsupervised algorithm SSA-UO for sentiment analysis on Twitter. Results: The characteristics of the info-communicative environment on Twitter during the online conversations about Cuban medical delegations evidence a predominance of positive polarity. Conclusions: Retweets, mentions and the publication of links influence the particularities of the debate on the topic in the microblogging sphere(AU)