Assessment of Mental Health and Coping Disparities Among Racial and Ethnic Groups Amid COVID-19 From the "How Right Now" Campaign.

OBJECTIVES: How Right Now (HRN) is an evidence-based, culturally responsive communication campaign developed to facilitate coping and resilience among US groups disproportionately affected by the COVID-19 pandemic. To inform the development of this campaign, we examined patterns in emotional health, stress, and coping strategies among HRN's audiences, focusing on differences among racial and ethnic groups. METHODS: We used a national probability panel, AmeriSpeak, to collect survey data from HRN's priority audience members in English and Spanish at 2 time points (May 2020 and May 2021). We conducted statistical testing to examine differences between time points for each subgroup (Hispanic, non-Hispanic Black, and non-Hispanic White) and differences among subgroups at each time point. RESULTS: We found disparities in COVID-19-related mental health challenges and differences in coping strategies. Non-Hispanic Black respondents were more likely than non-Hispanic White respondents to report challenges related to the social determinants of health, such as affording food and housing (26.4% vs 9.4% in May 2020) and experiencing personal financial loss (46.6% vs 29.2% in May 2020). In May 2021, 30.6% of Hispanic respondents reported being unable to meet basic food or housing needs versus 8.2% of non-Hispanic White respondents, and 51.6% reported personal financial loss versus 26.5% of non-Hispanic White respondents. CONCLUSIONS: Our study further illuminates what is needed to build emotional well-being pathways for people who historically have been economically and socially marginalized. Our findings underscore the need for public health interventions to provide culturally responsive mental health support to populations disproportionately affected by COVID-19 during the pandemic and into the future, with a focus on racial and ethnic disparities.

Cognitive training in adults with intellectual disability: pilot study applying a cognitive tele-rehabilitation program.

Introduction: This pilot study analyzes the effect of a cognitive training program in adults with intellectual disability (ID). Method: Twenty subjects (mean age 52.7 ± 9.77 years) with mild and moderate ID were divided in control and experimental group. Only the experimental group received the training program. This program was applied through the GNPT® (Guttmann, NeuroPersonalTrainer®) platform for people with ID. Results: The results revealed a significant improvement in the Kaufman Brief Intelligence Test-2 scores (Matrices subtest) in the experimental group [Z = 2.12; p = .03] after the intervention, indicating an enhancement in fluid ability due to effect of cognitive training program. Conclusion: Findings provide evidence of the importance of applying these programs in a systematized way in adults with ID.

Culturally Appropriate Breast Cancer and Environmental Risk Messages: Targeting Racially and Ethnically Diverse Mothers.

The National Institute of Environmental Health Sciences (NIEHS)-funded Breast Cancer and Environment Research Program (BCERP) provides evidence-informed educational materials targeting mothers with daughters to help them engage in lifestyle changes to reduce their environmental risk of breast cancer. Building on a partnership we developed to disseminate these materials via social media, we teamed with mommy bloggers and readers to evaluate the cultural appropriateness of the information using evidence-based practices for message design. We sought to (1) identify cross-culture factors that speak to a broad group of mothers and culture-specific factors to integrate when targeting specific cultures and (2) capture cultural challenges mothers encounter when they share the information with family to understand the social context in which they receive, interpret, and act on risk-reducing messages. We conducted 50 interviews with racially and ethnically diverse bloggers/readers and thematically analyzed transcripts, comparing findings across cultures. Across cultures, mothers identified five key factors for ensuring cultural appropriateness, but with notable cultural differences: (1) incorporate diverse images, (2) provide more information specific to environmental and cultural risk, (3) heighten the message of "it's a family affair", (4) make behavioral changes feasible, and (5) use less text, more visuals. Across cultures, women experienced intergenerational communication challenges with family, which were tied to (1) lack of openness, (2) relational norms, and (3) generational resistance. Findings provide message design considerations for targeting mothers broadly or based on race/ethnicity and support the notion that the larger family system should be considered when disseminating cancer risk education.

How Right Now? Supporting Mental Health and Resilience Amid COVID-19.

The How Right Now communication initiative (HRN) was developed to facilitate resilience amid the COVID-19 pandemic in the United States. HRN was designed as a conduit for promoting mental health and addressing feelings of grief, worry, and stress experienced during this time. This article provides an overview of the rapid, mixed-method, culturally responsive formative research process undertaken to inform the development of HRN. Specifically, it describes how HRN's disproportionately affected audiences (adults aged 65 and older and their caregivers, adults with preexisting physical and mental health conditions, adults experiencing violence, and adults experiencing economic distress) describe and discuss emotional resilience, what they need to be resilient, and what factors contribute to the perceptions of their ability to "bounce back" from the conditions caused by the COVID-19 pandemic. Data collection methods included an environmental scan (n ≥ 700 publications), social listening (n ≥ 1 million social media posts), partner needs-assessment calls (n = 16), partner-convened listening sessions with community members (n = 29), online focus groups (n = 58), and a national probability survey (n = 731), all in English and Spanish. Results revealed that HRN's audiences have diverse perceptions of what constitutes resilience. However, common factors were identified across populations to support resilience amid the COVID-19 pandemic, including informal and formal social support and access to services to meet basic needs, including food and housing resources. Stress, anxiety, depression, and experience with stigma and discrimination were also linked to resilience. Understanding the perspectives and experiences of disproportionately affected populations is vital to identifying supports and services, including the engagement of community stakeholders.

Understanding the messages and motivation of vaccine hesitant or refusing social media influencers.

BACKGROUND: While anti-vaccine messages on social media have been studied for content, reach, and effectiveness, less is known about those who create and promote the messages. Online influencers, or 'everyday people who are influential within their online social networks', are viewed as trusted voices who are often making similar life decisions as their followers. Therefore, their experiences with and perspectives on health issues can be persuasive. METHODS: We collaborated with a formal network of online influencers to interview, using a semi-structured interview guide, vaccine hesitant influencer mothers about their views on vaccination; their process for developing health-related social media content; their motivation to promote anti-vaccine messages; and their opinions on current vaccination messaging. Prescreening ensured a diverse sample by race/ethnicity, age, education, number of children, and geographic residence. Interviews occurred by telephone, were audio recorded, and transcribed. Themes were generated independently by two coders using a deductive coding approach. RESULTS: We interviewed 15 online influencer mothers from across the U.S. (average age 39 years old; all married; 13 Caucasian, 1 African American, 1 Hispanic). In some capacity, 5 of the 15 wrote about vaccination on their blog. Those who chose not to post anti-vaccine content did so for fear of alienating followers or having their platform be the site of combative discourse among readers. When researching their social media posts, the influencers did not trust mainstream sources of health information and relied on alternative sources and search engines. IMPLICATIONS: This exploratory study interviewed influential mothers who have the ability to spread anti-vaccine messages on social media. While most do not contribute to the anti-vaccine sentiment, understanding the motivation and practices of those that do assists the public health community in better understanding the online vaccination communication environment, leading to more effective messages to counterbalance anti-vaccine content on social media.

A Content Analysis of Social Support Messages about Environmental Breast Cancer Risk within Blogs for Mothers.

Bloggers can help stimulate online conversations among their readers about a variety of health topics, including breast cancer. However, in previous studies, researchers have not specifically examined supportive messages within an online blogger community that stem from an intervention where bloggers were provided with evidence-based information about breast cancer risk that they could tailor and disseminate to their readers. In the current study, we content analyzed 282 supportive messages within online conversations from participants in blogger communities over a 2-month period immediately following an intervention where the authors provided 74 bloggers who write about motherhood issues with an infographic based on evidence-based information from the Breast Cancer and the Environment Research Program (BCERP) about environmental breast cancer risk/prevention. Bloggers who shared information about their personal breast cancer risk generated a significantly higher number of blog reader comments than bloggers who did not share information about their personal breast cancer risk. Bloggers who cited breast cancer statistics in posts were more likely to draw esteem and emotional support from their readers. Bloggers' repetition of information from blog intervention messages was more likely to elicit esteem, informational, and emotional support from readers. Disclosure of a personal breast cancer diagnosis was associated with mixed types of social support messages. The theoretical and practical implications are discussed along with key limitations of the study and future directions for research in this area.

Helping Mothers and Daughters Talk about Environmental Breast Cancer Risk and Risk-Reducing Lifestyle Behaviors.

Background: Mothers and daughters struggle to talk about breast cancer risk. Even less attention is paid to environmental determinants of cancer. Third-party online approaches can be helpful navigating these conversations. The aim of this study was to obtain feedback from mothers exposed to a social media intervention ("mommy bloggers") and identify their preferences for message-design approaches that could help them talk to their daughter(s) about environmental breast cancer risk. Methods: We conducted semi-structured interviews with 50 mothers. A thematic analysis was conducted using the constant comparative method. Results: Mothers identified four approaches to message design that could help facilitate mother-daughter communication about environmental breast cancer risk. These included two action-oriented approaches that centered on getting the conversation started and keeping the conversation going and two approaches based on lifespan factors to promote daughters' engagement by using age-appropriate language and visuals and focusing on developmentally specific lifestyle behaviors. Mothers also provided recommended strategies within each approach. Conclusions: Mothers identified various approaches interventionists can utilize to overcome barriers to talking to daughters about environmental breast cancer risk. To promote mother-daughter communication, the messages should be action-oriented to facilitate interaction, but also developed with lifespan and developmental considerations in mind to engage daughters.

Meta-analysis of recommended digestible lysine levels for primiparous lactating sows / Meta-análise dos níveis de lisina digestível recomendados em dietas de porcas primíparas lactantes

ABSTRACT: A meta-analysis was carried out to evaluate the recommended levels of digestible lysine and its influence on the productive performance of primiparous lactating sows. The database consisted of 26 publications, 138 diets and 3,820 sows was developed from articles on the association between, lysine, crude protein and lactating primiparous sows. The digestible lysine levels of the studies ranged from 0.22 to 1.43% with average values of 0.85% digestible lysine in the diet, with consumption of 41.25 g day-1. The digestible lysine intake of sows was positively correlated (P<0.05) with feed intake, essential amino acids, crude protein, metabolizable energy, body weight loss sows, milk production, number and weight of piglets at weaning. Digestible lysine intake showed negative correlation (P<0.05) with backfat thickness at weaning and weaning to oestrus interval. It was observed a quadratic effect (P<0.01) of body weight loss sow and daily weight gain of piglets and a quadratic effect (P<0.01) in the weight of piglets at weaning due to increased dietary lysine level. The level of 1.04% of digestible lysine indicates less weight loss sows. The greater weight of piglets at weaning and increased daily weight gain of piglets was verified with the addition of 1.30 and 1.07% digestible lysine in the diet, respectively.

RESUMO: Realizou-se a meta-análise com o objetivo de determinar o nível recomendado de lisina digestível e sua influência sobre o desempenho produtivo de porcas primíparas lactantes. A base de dados composta por 26 publicações, 138 dietas e 3.820 fêmeas foi desenvolvida a partir de artigos sobre a associação entre, lisina, proteína bruta e porcas primíparas lactantes. Os níveis de lisina digestível dos estudos variaram de 0,22 a 1,43% com valores médios de 0,85% de lisina digestível nas dietas, com consumo de 41,25 g dia-1. O consumo de lisina digestível das porcas apresentou correlação positiva (P<0,05) com o consumo de ração, aminoácidos essenciais, proteína bruta, energia metabolizável, perda de peso corporal da porca, produção de leite, número e peso de leitões ao desmame. O consumo de lisina indicou correlação negativa (P<0,05) para espessura de toucinho ao desmame e intervalo desmame-cio. Observou-se efeito quadrático (P<0,01) da perda de peso corporal da porca e ganho de peso diário dos leitões e efeito quadrático (P<0,01) do peso dos leitões ao desmame em função do aumento do nível de lisina da dieta. O nível de 1,04% de lisina digestível indica a menor perda de peso da porca. O maior peso dos leitões ao desmame e maior ganho de peso diário dos leitões é verificado com a inclusão de 1,30 e 1,07% de lisina digestível na dieta, respectivamente.

Metadata Correction: Partnering With Mommy Bloggers to Disseminate Breast Cancer Risk Information: Social Media Intervention.

[This corrects the article DOI: 10.2196/12441.].

Partnering With Mommy Bloggers to Disseminate Breast Cancer Risk Information: Social Media Intervention.

BACKGROUND: Women are concerned about reducing their breast cancer risk, particularly if they have daughters. Social media platforms, such as blogs written by mothers, are increasingly being recognized as a channel that women use to make personal and family health-related decisions. Government initiatives (eg, Interagency Breast Cancer and Environmental Research Coordinating Committee) and researchers have called for scientists and the community to partner and disseminate scientifically and community-informed environmental risk information. OBJECTIVE: We developed and evaluated a blog intervention to disseminate breast cancer and environmental risk information to mothers. We teamed with mommy bloggers to disseminate a message that we developed and tailored for mothers and daughters based on scientific evidence from the Breast Cancer and the Environment Research Program (BCERP). We posited that the intervention would influence women's exposure to, acceptance of, and beliefs about environmental risks while promoting their intention to adopt risk-reducing behaviors. METHODS: Using a quasi-experimental design, we recruited 75 mommy bloggers to disseminate the breast cancer risk message on their respective blogs and examined the impact of the intervention on (1) readers exposed to the intervention (n=445) and (2) readers not exposed to the intervention (comparison group; n=353). RESULTS: Following the intervention, blog reader scores indicating exposure to the breast cancer risk and prevention information were greater than scores of blog readers who were not exposed (or did not recall seeing the message; mean 3.92, SD 0.85 and mean 3.45, SD 0.92, respectively; P<.001). Readers who recalled the intervention messages also had higher breast cancer risk and prevention information satisfaction scores compared with readers who did not see (or recall) the messages (mean 3.97, SD 0.75 and mean 3.57, SD 0.94, respectively; P<.001). Blog readers who recalled seeing the intervention messages were significantly more likely to share the breast cancer risk and prevention information they read, with their daughters specifically, than readers who did not recall seeing them (χ21=8.1; P=.004). Those who recalled seeing the intervention messages reported significantly higher breast cancer risk and prevention information influence scores, indicative of behavioral intentions, than participants who did not recall seeing them (mean 11.22, SD 2.93 and mean 10.14, SD 3.24, respectively; P=.003). Most women ranked Facebook as their first choice for receiving breast cancer risk information. CONCLUSIONS: Results indicated that blog readers who were exposed to (and specifically recalled) the BCERP-adapted intervention messages from mommy bloggers had higher breast cancer risk and prevention information exposure scores and higher breast cancer risk and prevention information satisfaction and influence scores than those who did not see (or recall) them. Mommy bloggers may be important opinion leaders for some women and key to enhancing the messaging, delivery, and impact of environmental breast cancer risk information on mothers.

The "Real World"? Effects of Online Communication about Prostate Cancer on Offline Communication.

INTRODUCTION: Online peer-to-peer social support programs are based on the premise that support from others who have been through a similar experience can help reduce the negative impacts of disease. Such support programs are increasingly found online, but how these conversations translate into real world interactions about health concerns is currently not well understood. METHODS: Grounded in social network theory, this formative study explored how participants in an online prostate cancer community comprised of patients and their families translate their online conversations into offline ones. A survey was designed and fielded, and received 157 complete responses. RESULTS: Results support prior research findings that these offline conversations are primarily information-oriented (n = 105) and extend them by the finding that members of online prostate cancer social support communities do, in fact, share information obtained online with others offline (n = 103). Family members appear to be primary receivers of this information (n = 121) while health care providers are not, which may impact treatment and care. CONCLUSIONS: The opportunity to tie more concretely online messages with offline conversations is of critical importance and interest. Recommendations are presented for future research.

Perceptions About Disseminating Health Information Among Mommy Bloggers: Quantitative Study.

BACKGROUND: Social media are potentially powerful channels for communicating relevant health information in culturally sensitive and influential ways to key audiences. Moreover, these channels hold promise for promoting awareness and knowledge of health risks, prevention, and treatment by utilizing opinion leaders for message dissemination. Despite limited empirical evidence to-date, early promising results suggest that blogs are a form of social media that should be examined as worthy channels for health communication. OBJECTIVES: This formative study explored mommy bloggers' perceptions about sharing health-related information on their blogs with their readers. It also sought to analyze which topics would be of most interest to mommy bloggers, what motivates them to write about health issues, and how they perceive interest in these topics among their readers. METHODS: This study employed survey methodology, including the use of open-ended questions, the responses to which were coded for analysis. Specifically, a 14-item survey was fielded with mommy bloggers between October 1 and October 28, 2016. Bloggers were recruited through The Motherhood network. A total of 461 mommy bloggers responded to the survey; 163 were removed for low quality responses and incomplete data. As a result, 298 eligible participants completed the survey. For open-ended questions in the survey, a sample of responses were coded and analyzed. RESULTS: The majority of the respondents (87.2%, 260/298) reported that they have written about health issues in the past; 97.3% (290/298) of the respondents reported that they would consider writing about health issues sometime in the future, and 96.3% (287/298) of the respondents reported that their readers like to read about health issues on their blogs. In terms of content priorities for this sample of bloggers, Nutrition and Physical Activity dominate the current conversation and similarly, Physical Activity and Nutrition remain top content priorities for these bloggers for the future. Moreover, 21.3% of the respondents reported that their readers would be interested in these topics. Finally, having a personal connection with a health issue was found to be positively associated with likeliness to write about health issues on their blog (P<.001). CONCLUSIONS: This study illustrates that there are potentially rich opportunities for working with mommy bloggers to communicate with key health decision makers (moms) on important health issues. There is a great support among mommy bloggers for health information dissemination as well as interest for accessing relevant health information from their readers. This presents an opportunity for public health research and communication campaigns to more broadly promote their messages, thereby contributing to their behavior change objectives. Limitations included overrepresentation of white, higher-educated, and younger women. It suggests a need for more targeted engagement of a diverse sample for future work.

Unlucky communication: Frases o actitudes desafortunadas en medicina / Unfortunate Communication: improper sentences or attitudes in medicine

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Leveraging social and digital media for participant recruitment: A review of methods from the Bayley Short Form Formative Study.

INTRODUCTION: Social media is increasingly being used in research, including recruitment. METHODS: For the Bayley Short Form Formative Study, which was conducted under the the National Children's Study, traditional methods of recruitment proved to be ineffective. Therefore, digital media were identified as potential channels for recruitment. RESULTS: Results included successful recruitment of over 1800 infant and toddler participants to the Study. CONCLUSIONS: This paper outlines the methods, results, and future research opportunities.

Genome Sequences of Mycobacteriophages Kerberos, Pomar16, and StarStuff.

We describe the genome sequences of three closely related mycobacteriophages, Kerberos, Pomar16, and StarStuff, isolated at similar times but from geographically distinct regions. All three genomes are similar to those of other subcluster A2 phages, such as L5 and D29, are temperate, and have siphoviral virion morphologies.

Perceived Stress in Online Prostate Cancer Community Participants: Examining Relationships with Stigmatization, Social Support Network Preference, and Social Support Seeking.

Men with prostate cancer often need social support to help them cope with illness-related physiological and psychosocial challenges. Whether those needs are met depends on receiving support optimally matched to their needs. This study examined relationships between perceived stress, prostate cancer-related stigma, weak-tie support preference, and online community use for social support in a survey of online prostate cancer community participants (n = 149). Findings revealed a positive relationship between stigma and perceived stress. This relationship, however, was moderated by weak-tie support preference and online community use for social support. Specifically, stigma was positively related to perceived stress when weak-tie support was preferred. Analyses also showed a positive relationship between stigma and perceived stress in those who used their online community for advice or emotional support. Health communication scholars should work collaboratively with diagnosed men, clinicians, and online community administrators to develop online interventions that optimally match social support needs.

A review of social media methods and lessons learned from the National Children's Study.

INTRODUCTION: Given the reach and influence of social media, the National Children's Study Vanguard Study evaluated the feasibility, acceptability, and cost of using social media to support participant retention. METHODS: We describe a social media experiment designed to assess the impact of social media on participant retention, discuss several key considerations for integrating social media into longitudinal research, and review factors that may influence engagement in research-related social media. RESULTS: User participation varied but was most active when at launch. During the short life of the private online community, a total of 39 participants joined. General enthusiasm about the prospect of the online community was indicated. There were many lessons learned throughout the process in areas such as privacy, security, and Institutional Review Board clearance. These are described in detail. CONCLUSIONS: The opportunity to engage participants in longitudinal research using online social networks is enticing; however, more research is needed to consider the feasibility of their use in an ongoing manner. Recommendations are presented for future research seeking to use social media to improve retention in longitudinal research.

Caracterización de las personas con pie diabético. Monterrey, México / Characterization of patients with diabetic foot. Monterrey, Mexico

Identificar las características personales, familiares, clínicas y socio económicos de las personas con pie diabético, que estuvieron hospitalizadas en una institución de salud de tercer nivel en Monterrey, Nuevo León durante el año 2009 y 2010. Material y Métodos: fue un estudio descriptivo. La unidad de análisis fueron 275 expedientes clínicos de pacientes con DT2 con diagnóstico de pie diabético. Resultados: el 66,9% de los expedientes correspondieron al género masculino y un 33,1% al femenino, con edad media de 59,2 años (DE = 12,5; 31-95); el 59,6% tenían pareja; con una estancia hospitalaria promedio fue 6,4 días (DE = 5,8; 1-39); el 85,5% de los participantes cursaron en promedio 5,71 años de educación formal (DE = 3.8; 0-17), el 32 % reportaron estar desempleadas, los años de diagnóstico de DT2 en n = 255 personas fue de 14.2 años (DE = 9.0; 1-40); con diagnóstico de pie diabético en n = 94 personas (34,2%), fue de 3 años (DE = 2.3; 1-10); destacó la HTA con 22,9% masculino, 21,4% femenino con tiempo de diagnóstico de uno a 40 años; el 90% de los valores de HbA1c fueron superiores a 7%. En cuanto a los cultivos de úlceras 3,6% fueron gram+; consumo más el género masculino con 25,8% de alcohol y 21% tabaco y solo el 1% consume marihuana y cocaína; el 43,4% reportaron DT2 y paterno el 17%; en el tipo de lesión destaca la amputación supracondílea 34%. Conclusiones: se identificaron factores alarmantes que ubican en riesgo de complicaciones a la persona con DT2, se requiere mayor profundización en el fenómeno estudiado...

Identify the personal, relatives, clinics and socio-economic characteristics of the people with diabetic foot who they were hospitalized in a health institution of third level in Monterrey, Nuevo Leon during the 2009 and 2010 years. Material and Methods: It was a descriptive study. In the analysis unit had 275 clinic records of DT2 patients with diabetic foot diagnosis. Results: The 66.9% of the records corresponded to the masculine gender and the 33.1% to the female gender, with a media age of 59.2 years (DE = 12.5; 31-95), the 59.6% they had a couple, the staying in hospital was 6.4 days (DE = 5.8; 1-39); the 85.5% of the participants studied in average 5.71 years of formal education (DE = 3.8; 0-17), the 32 % reported being unemployed, the diagnosis years of DT2 in n=255 people were 14.2 years (DE = 9.0; 1-40); with diabetic foot diagnosis in n=94 people (34.2%), it was 3 years (DE = 2.3; 1-10); the HTA stand out with 22.9% masculine, 21.4% female with a diagnosis time of 40 years; the 90% of the HbA1c values were superior of 7%. With regard to the ulcer culture 3.6% were gram+; consumed more the masculine gender with 25.8% alcohol and 21% tobacco and just 1% consumed marihuana and cocaine; the 43.4% reported DT2 and paternal 17% in the kind of injury stand out the supracondilea amputation 34%. Conclusions: They were identified alarming factors which place in risk of complication to the DT2 person, it required more deepening in the phenomena studied...

Trending now: future directions in digital media for the public health sector.

BACKGROUND: Digital media usage is expanding enormously and is starting to be used as a public health intervention and communication tool. It has an ability to increase the reach of public health research and communication, as well as drive measurable behaviour change. But there is an absence of both deep and wide understanding of the opportunities within digital media, i.e. most people think only of Facebook and Twitter when they think of social media; smart, strategic planning for its widespread use is not common practice and rigorous evaluative studies of its effectiveness are few and far between. METHODS: This paper analyses the published literature on this topic and identifies the top 10 directions that use of digital media is likely to take in the medium term. RESULTS: The analysis strongly supports the position that digital media needs to be taken seriously as a vehicle for public health activity in its own right and not merely as an adjunct to other campaigns. CONCLUSIONS: Digital media will continue to develop and move from being an add-on to existing activity to being the major vehicle for significant elements of research, data collection and advocacy. It is important that public health leaders fully understand and engage in its development and use.

Variabilidad morfológica clínica del sistema de conductos de la raíz mesial de los primeros molares mandibulares: análisis de 150 casos / Morphological-clinical variability of the duct system of the mesial root of the mandibular first molars. Analysis of 150 cases

Introducción: El conocimiento de la complejidad del espacio radicular es esencial para el éxito del tratamiento endodóncico. La raíz mesial del primer molar inferior presenta como variante anatómica la existencia de un istmo entre los conductos mesiovestibular y mesiolingual que puede pasar desapercibido o que puede ser trabajado como un conducto suplementario. Objetivo. Clasificar y mostrar el aspecto in vivo de las diferentes morfologías que puede presentar la raíz mesial del primer molar mandibular desde el punto de vista clínico y radiográfico, teniendo presente la permeabilidad del istmo. Material y método. Muestra de 150 primeros molares mandibulares fueron catalogados según los siguientes parámetros: exploración visual de la cámara y aspectos radiográficos durante el tratamiento endodóncico. Resultados. El 82% de los casos evidenció la presencia de dos conductos sin istmo canalizable, aunque visible(istmo rudimentario) en el 40% de los caos. El resto de la muestra (18%) presentó un istmo canalizable (tener conducto) siendo clasificados según el punto de su permeabilización en: lingual (6,7%), vestibular (6%), intermedio (4%) y más de un punto de permeabilidad (1,3%). Conclusiones. La identificación visual de un surco que relaciona los conductos mesiovestibular y mesiolingula obliga al clínico a buscar un espacio por el que permeabilizar, limpiar y obturar el istmo como si de un tercer conducto se tratara. La canalización del istmo se comprueba en la radiografía de conductometría y no en la radiografía final, ya que la superposición del material de obturación hace que no se evidencie frecuentemente la presencia de los tres conductos (AU)

Introduction. The knowledge about the complex anatomy of the radicular space is essential for the success of the endodontic treatment. The mesial root of the permanent mandibular first molar shows isthmus between the mesiobuccal and mesiolingual canals, with different morphologies, that can go unnoticed. Objective. Sort and show in vivo the clinical appearance of different morphologies that may have mesial root of the permanent mandibular first molar in radiographic images and photographs taken during the root canal treatment, taking into account the permeability of the isthmus. Material and methods. 150 mandibular first molar were classified according to visual exploration of the chamber and radiographic images during endodontic treatment. Results. The 82% of total showed the presence of two canals without isthmus channeling, but visible (rudimentary isthmus) in 40% of cases. The rest of the sample (18%) had as isthmus ducted (third canal) being classified according to the permeabilization point: lingual (6,7%), buccal (6%), intermediate (4%) and permeability of more than one point (1,3%). Conclusions. Visual identification of a path that links the mesiobuccal and mesiolingual canals obliges the practitioner to look for a space in order to get patency, cleaning, shaping and filing the isthmus as if it were at third canal. Cahnneling the isthmus is usually found in the working length radiograph and not on the final radiograph as the superposition of the filling material does not often show evidence of the presence of three canals (AU)