SNPs in genes related to the repair of damage to DNA in clinical isolates of M. tuberculosis: A transversal and longitudinal approach.

The presence of SNPs in genes related to DNA damage repair in M. tuberculosis can trigger hypermutagenic phenotypes with a higher probability of generating drug resistance. The aim of this research was to compare the presence of SNPs in genes related to DNA damage repair between sensitive and DR isolates, as well as to describe the dynamics in the presence of SNPs in M. tuberculosis isolated from recently diagnosed TB patients of the state of Veracruz, Mexico. The presence of SNPs in the coding regions of 65 genes related to DNA damage repair was analyzed. Eighty-six isolates from 67 patients from central Veracruz state, Mexico, were sequenced. The results showed several SNPs in 14 genes that were only present in drug-resistant genomes. In addition, by following of 15 patients, it was possible to describe three different dynamics of appearance and evolution of non-synonymous SNPs in genes related to DNA damage repair: 1) constant fixed SNPs, 2) population substitution, and 3) gain of fixed SNPs. Further research is required to discern the biological significance of each of these pathways and their utility as markers of DR or for treatment prognosis.

Mutational Dynamics Related to Antibiotic Resistance in M. tuberculosis Isolates from Serial Samples of Patients with Tuberculosis and Type 2 Diabetes Mellitus.

Genetic variation in tuberculosis is influenced by the host environment, patients with comorbidity, and tuberculosis-type 2 diabetes mellitus (TB-T2DM) and implies a higher risk of treatment failure and development of drug resistance. Considering the above, this study aimed to evaluate the influence of T2DM on the dynamic of polymorphisms related to antibiotic resistance in TB. Fifty individuals with TB-T2DM and TB were initially characterized, and serial isolates of 29 of these individuals were recovered on day 0 (diagnosis), 30, and 60. Genomes were sequenced, variants related to phylogeny and drug resistance analyzed, and mutation rates calculated and compared between groups. Lineage X was predominant. At day 0 (collection), almost all isolates from the TB group were sensitive, apart from four isolates from the TB-T2DM group showing the mutation katG S315T, from which one isolate had the mutations rpoB S450L, gyrA A90G, and gyrA D94G. This pattern was observed in a second isolate at day 30. The results provide a first overview of the dynamics of mutations in resistance genes from individuals with TB-T2DM, describing an early development of resistance to isoniazid and a rapid evolution of resistance to other drugs. Although preliminary, these results help to explain the increased risk of drug resistance in individuals with TB and T2DM.

A Versatile Urea Type Linker for Functionalizing Natural Glycans and Its Validation in Glycan Arrays.

The isolation from organisms and readily available glycoproteins has become an increasingly convenient source of N-glycans for multiple applications including glycan microarrays, as reference standards in glycan analysis or as reagents that improve bioavailability of protein and peptide therapeutics through conjugation. A problematic step in the isolation process on a preparative scale can be the attachment of a linker for the improved purification, separation, immobilization and quantification of the glycan structures. Addressing this issue, we firstly aimed for the development of an UV active linker for a fast and reliable attachment to anomeric glycosylamines via urea bond formation. Secondly, we validated the new linker on glycan arrays in a comparative study with a collection of N-glycans which were screened against various lectins. In total, we coupled four structurally varied N-glycans to four different linkers, immobilized all constructs on a microarray and compared their binding affinities to four plant and fungal lectins of widely described specificity. Our study shows that the urea type linker showed an overall superior performance for lectin binding and once more, highlights the often neglected influence of the choice of linker on lectin recognition.

Whole genome sequencing analysis to evaluate the influence of T2DM on polymorphisms associated with drug resistance in M. tuberculosis.

BACKGROUND: Type 2 diabetes mellitus (T2DM) has been associated with treatment failure, and the development of drug resistance in tuberculosis (TB). Also, whole-genome sequencing has provided a better understanding and allowed the growth of knowledge about polymorphisms in genes associated with drug resistance. Considering the above, this study analyzes genome sequences to evaluate the influence of type 2 diabetes mellitus in the development of mutations related to tuberculosis drug resistance. M. tuberculosis isolates from individuals with (n = 74), and without (n = 74) type 2 diabetes mellitus was recovered from online repositories, and further analyzed. RESULTS: The results showed the presence of 431 SNPs with similar proportions between diabetics, and non-diabetics individuals (48% vs. 52%), but with no significant relationship. A greater number of mutations associated with rifampicin resistance was observed in the T2DM-TB individuals (23.2% vs. 16%), and the exclusive presence of rpoBQ432L, rpoBQ432P, rpoBS441L, and rpoBH445L variants. While these variants are not private to T2DM-TB cases they are globally rare highlighting a potential role of T2DM. The phylogenetic analysis showed 12 sublineages, being 4.1.1.3, and 4.1.2.1 the most prevalent in T2DM-TB individuals but not differing from those most prevalent in their geographic location. Four clonal complexes were found, however, no significant relationship with T2DM was observed. Samples size and potential sampling biases prevented us to look for significant associations. CONCLUSIONS: The occurrence of globally rare rifampicin variants identified only in isolates from individuals with T2DM could be due to the hyperglycemic environment within the host. Therefore, further studies about the dynamics of SNPs' generation associated with antibiotic resistance in patients with diabetes mellitus are necessary.

SNPs in Genes Related to DNA Damage Repair in Mycobacterium Tuberculosis: Their Association with Type 2 Diabetes Mellitus and Drug Resistance.

Genes related to DNA damage repair in Mycobacterium tuberculosis are critical for survival and genomic diversification. The aim of this study is to compare the presence of SNPs in genes related to DNA damage repair in sensitive and drug-resistant M. tuberculosis genomes isolated from patients with and without type 2 diabetes mellitus (T2DM). We collected 399 M. tuberculosis L4 genomes from several public repositories; 224 genomes belonging to hosts without T2DM, of which 123 (54.9%) had drug sensitive tuberculosis (TB) and 101 (45.1%) had drug resistance (DR)-TB; and 175 genomes from individuals with T2DM, of which 100 (57.1%) had drug sensitive TB and 75 (42.9%) had DR-TB. The presence of SNPs in the coding regions of 65 genes related to DNA damage repair was analyzed and compared with the resistance profile and the presence/absence of T2DM in the host. The results show the phylogenetic relationships of some SNPS and L4 sub-lineages, as well as differences in the distribution of SNPs present in DNA damage repair-related genes related to the resistance profile of the infecting strain and the presence of T2DM in the host. Given these differences, it was possible to generate two discriminant functions to distinguish between drug sensitive and drug resistant genomes, as well as patients with or without T2DM.

Genetic diversity and drug susceptibility of Mycobacterium tuberculosis in a city with a high prevalence of drug resistant tuberculosis from Southeast of Mexico.

BACKGROUND: Mexico is on the top five countries with the highest number of TB cases in America continent, nevertheless, information about genotypes circulating is practically unknown. Considering the above this study aims to characterize the genetic diversity of TB in the city of Veracruz, México. METHODS: A cross-sectional study was conducted among positive smear samples from patients living in Veracruz City, samples were cultured, and first-line drug profiles determined. Genotyping was made by spoligotyping and MIRU-VNTR 24 loci. Associations of lineages, clusters, and variables were also analyzed. RESULTS: Among the 202 isolates analyzed resistance to at least one drug was observed in 60 (30%) isolates and 41(20%) were multidrug-resistant. Three major lineages were identified: L4/Euro-American (88%), L1/Indo-Oceanic (9%), and L2/East Asian (3%). The Euro-American lineage included more than six sublineages, the most abundant were: H (32%), T (23%), LAM (18%), and X (12%). 140 isolates (70%) were placed in 42 SITs patterns. CONCLUSIONS: These results provide the first baseline data on the genetic structure of TB in the city of Veracruz. Sublineages H, X and LAM were predominant; however, it was founded an important diversity of genotypes that could contribute to the dispersion of TB and explain the high prevalence. This information might be useful for the development of further interventions to reduce impact of TB.

Interventions to Improve Clinical Coordination between Levels: Participatory Experience in a Public Healthcare Network in Xalapa, Mexico.

INTRODUCTION: Coordination of care can be improved through an intervention or a combination of several ones. In addition, it is recommended to encourage the active involvement of professionals in the design, implementation and assessment of coordination mechanisms. OBJECTIVE: To analyse the factors that influence the implementation of participatively designed interventions and their effects on clinical coordination between levels of care in a public healthcare network of health services in Xalapa, Veracruz, Mexico. METHODS: A qualitative, descriptive-interpretative study, for which individual interviews and discussion groups with a criterion sample of participants: Local Steering Committee and the Professional Platform. A content analysis, with mixed category generation and segmentation by intervention and topics, was carried out. According to the problem analysis, participants designed two sequential interventions: offline virtual consultation, and joint training meetings on maternal health and chronic diseases. RESULTS: Respondents perceived a differentiated impact on clinical coordination according to intervention: greater in the case of joint maternal health trainings and limited for the chronic diseases meetings, as they were the offline virtual consultation was rarely used. CONCLUSION: The involvement of professionals in designing the interventions, as well as institutional support and reflexive methods for training, all decisively improved clinical coordination between levels.

Diversidad genética de Mycobacterium tuberculosis circulando en la jurisdicción V de Jalapa, Veracruz, México / Genetic diversity of Mycobacterium tuberculosis circulating in the jurisdiction V from Jalapa, Veracruz, Mexico

ANTECEDENTES: El estado de Veracruz se ubica en el sureste de México y presenta una alta prevalencia de tuberculosis (TBC) y drogo resistencia. Sin embargo, la composición de los genotipos circulantes es poco conocida. OBJETIVO: Caracterizar la diversidad genética de la TBC en la jurisdicción sanitaria V del estado de Veracruz. MÉTODOS: Estudio transversal realizado en aislados clínicos de pacientes con TBC residentes de la jurisdicción V. Se determinó la sensibilidad a medicamentos de primera línea. La genotipificación se realizó mediante espoligotipificación y MIRU-VNTR 15 loci. RESULTADOS: Entre los 74 aislados analizados se observó resistencia a un fármaco en 44 (59%) aislados. Linaje L4 (EuroAmericano) se presentó en 73 aislados. Se identificaron cinco sublinajes; H (40%), T (22%), LAM (16%), X (13%) y U (7%). El 32% de los aislados se agrupó mediante su espoligotipo y 40% en 10 complejos clonales. CONCLUSIONES: Es la primera descripción sobre la estructura genética de TBC en la región central de Veracruz. La diversidad de genotipos podría contribuir a su dispersión en la región. Esta información será útil para el desarrollo de intervenciones y reducir el impacto de TBC en la población.

BACKGROUND: The state of Veracruz is placed in southeastern Mexico and has a high prevalence of tuberculosis (TB) and drug resistance. Nevertheless, the composition of circulating genotypes in the central region of the state is partially known. AIM: To characterize the genetic diversity of TB in the sanitary jurisdiction V of the state of Veracruz. METHODS: A cross-sectional study was conducted among clinical isolates from patients with TB living in the jurisdiction V, in Jalapa Ver., Mexico. Sensitivity to first-line drugs was determined, and genotyping was performed by spoligotyping and MIRU-VNTR 15 loci. RESULTS: Among the 74 isolates analyzed, resistance to one drug was observed in 44 isolates. L4 (EuroAmerican) was the major lineage identified. Five sublineages were the most abundant; H (40%), T (22%), LAM (16%), X (13%) and U (7%). Only 32% of the isolates were clustered by spoligotype and 40% were placed in ten clonal complexes. CONCLUSIONS: This is the first description of the genetic structure of TB in the central region of Veracruz. The diversity of genotypes could contribute to its dispersion. This information will be useful for the development of interventions to reduce the impact of TB in the population.

[Nanoparticles as drug transporters: a promising tool against tuberculosis]. / Nanopartículas como transportadores de fármacos: una herramienta prometedora contra la tuberculosis.

The World Health Organization (WHO) places Tuberculosis (TB) as one of the most important health problems today. According to the WHO, this disease requires novel actions to control its expansion and, in this way, achieve one of the goals established in the sustainable development goals: to reduce TB morbidity and incidence by 2030 and regain control. To achieve this goal, the tools currently used for diagnosis and treatment are no longer adequate. In this sense, it is necessary to develop new drugs and vaccines, as well as novel drug administration procedures that generate a better response, reduce times, and optimize treatments. Nanotechnology has incorporated in recent years a considerable number of new tools that significantly increase the diversity of mechanisms for the administration of anti-tuberculosis drugs. Therefore, the present review briefly describes the current state of drug resistance in tuberculosis, as well as the general characteristics of nanoparticles being evaluated as tools to transport new antibiotics against tuberculosis.

La Organización Mundial de la Salud (OMS) ubica a la tuberculosis (TB) como uno de los problemas de salud más preocupantes en la actualidad, y señala que se requieren de acciones novedosas para controlar su expansión y, de esta manera, alcanzar una de las metas establecidas en los Objetivos de Desarrollo Sostenible: reducir para 2030 la morbilidad e incidencia de TB. Para lograr este objetivo, está claro que las herramientas empleadas actualmente para su diagnóstico y tratamiento ya no son las adecuadas. En este sentido, es necesario desarrollar nuevos medicamentos y vacunas, así como novedosos procedimientos de administración de fármacos que generen una mejor respuesta, disminuyan el tiempo y optimicen los tratamientos. La nanotecnología ha incorporado en los últimos años un gran número de nuevas herramientas que incrementan considerablemente, la diversidad de mecanismos para la administración de tratamientos antituberculosos. Dicho esto, la presente revisión describe brevemente el estado actual de la farmacorresistencia en TB, así como las características generales de las nanopartículas que están evaluándose como herramientas para transportar antibióticos antituberculosos.

[Barriers and factors associated with the use of coordination mechanisms between levels of care in Mexico]. / Barreras y factores asociados al uso de mecanismos de coordinación entre niveles de atención en México.

The aim was to analyze the level and characterize the use of clinical coordination mechanisms between levels of care, and their associated factors, in two public networks of health services in Mexico. A cross-sectional study was carried out using the COORDENA questionnaire to primary and specialized care physicians in the state of Veracruz. Differences were found between networks and levels of care, according to the mechanism. In both, the referral/counter-referral is mostly used to channel the patient to another level, mainly by primary care physicians. A high reception of referrals by specialists was identified, but few counterreferences in primary care. Being a man and recognizing the primary care physician, as responsible for monitoring the patient in his/her healthcare career, were factors associated with the frequent sending of the counter-referral by specialists. The discharge report is used in both networks to send clinical information to the other level, with more sending by specialist doctors, but with less reception in primary care. In both networks, the follow-up to the recommendations of the mechanisms to standardize clinical care was greater by primary care physicians than specialized ones. The use of coordination mechanisms between levels of care is deficient and limited, with greater use of mechanisms to transfer information than for clinical management. The need to implement strategies that consider the participation of professionals is evident, to favor local adaptation, appropriation and improve their use.

El objetivo fue analizar el nivel y caracterizar el uso de mecanismos de coordinación clínica entre niveles de atención, y sus factores asociados, en dos redes públicas de servicios de salud en México. Se realizó estudio transversal mediante el cuestionario COORDENA a médicos de atención primaria y especializada del estado de Veracruz. Se encontraron diferencias entre redes y niveles de atención, según el mecanismo. En ambas, la referencia/contrarreferencia es sobre todo utilizada para canalizar al paciente a otro nivel, principalmente por parte de los médicos de atención primaria. Se identificó una alta recepción de referencias por especialistas, pero escasa recepción de contrarreferencias en atención primaria. Ser hombre y reconocer al médico/a de atención primaria como responsable del seguimiento del paciente en su trayectoria asistencial, fueron factores asociados al envío frecuente de la contrarreferencia por especialistas. El informe de alta se utiliza en ambas redes para enviar información clínica al otro nivel, con mayor envío por médicos/as especialistas, y con menor recepción en atención primaria. En ambas redes, el seguimiento a las recomendaciones de los mecanismos para estandarizar la atención clínica (guías de práctica clínica, etc.) por parte médicos/as de atención primaria que de especializada. La utilización de mecanismos de coordinación entre niveles de atención es deficiente y limitada, con mayor uso de mecanismos para transferir información que para la gestión clínica. Se evidencia la necesidad de implementar estrategias que consideren la participación de los profesionales, para favorecer la adaptación local, apropiación y mejorar su uso.

O objetivo era analisar o nível e caracterizar o uso de mecanismos de coordenação clínica entre níveis de atenção e seus fatores associados em duas redes públicas de saúde no México. Estudo transversal por meio do questionário COORDENA aplicados a médicos da atenção primaria e especializada do Estado de Veracruz. Foram encontradas diferenças entre redes e níveis de atenção conforme o mecanismo. Em ambas, a referência/contrarreferência é sobre tudo utilizada para encaminhar o paciente para outro nível, principalmente por parte dos médicos da atenção primária. Foi identificado um alto recebimento de referências por especialistas, porém raras são as contrarreferências na atenção primária. Ser homem e reconhecer o médico/a de atenção primária como responsável pelo acompanhamento do paciente na sua trajetória de atendimento foram fatores associados ao envio frequente da contrarreferência por especialistas. O relatório de alta é utilizado nas duas redes para enviar informação clínica ao outro nível, com mais envios por médicos/as especialistas e menos recebimentos na atenção primária. Em ambas as redes, a observância das recomendações de mecanismos para padronizar a atenção clínica foi maior por parte dos médicos/as da atenção primária do que da especializada. O uso de mecanismos de coordenação entre níveis de atenção é deficiente e limitado, com o emprego maior de mecanismos para transmitir informação do que para a gestão clínica. Ficou evidenciada a necessidade de implementar estratégias que levem em conta a participação dos profissionais, para promover a adequação local, a apropriação e melhorar a sua utilização.

Nanopartículas como transportadores de fármacos: una herramienta prometedora contra la tuberculosis / Nanoparticles as drug transporters: a promising tool against tuberculosis

RESUMEN La Organización Mundial de la Salud (OMS) ubica a la tuberculosis (TB) como uno de los problemas de salud más preocupantes en la actualidad, y señala que se requieren de acciones novedosas para controlar su expansión y, de esta manera, alcanzar una de las metas establecidas en los Objetivos de Desarrollo Sostenible: reducir para 2030 la morbilidad e incidencia de TB. Para lograr este objetivo, está claro que las herramientas empleadas actualmente para su diagnóstico y tratamiento ya no son las adecuadas. En este sentido, es necesario desarrollar nuevos medicamentos y vacunas, así como novedosos procedimientos de administración de fármacos que generen una mejor respuesta, disminuyan el tiempo y optimicen los tratamientos. La nanotecnología ha incorporado en los últimos años un gran número de nuevas herramientas que incrementan considerablemente, la diversidad de mecanismos para la administración de tratamientos antituberculosos. Dicho esto, la presente revisión describe brevemente el estado actual de la farmacorresistencia en TB, así como las características generales de las nanopartículas que están evaluándose como herramientas para transportar antibióticos antituberculosos.

ABSTRACT The World Health Organization (WHO) places Tuberculosis (TB) as one of the most important health problems today. According to the WHO, this disease requires novel actions to control its expansion and, in this way, achieve one of the goals established in the sustainable development goals: to reduce TB morbidity and incidence by 2030 and regain control. To achieve this goal, the tools currently used for diagnosis and treatment are no longer adequate. In this sense, it is necessary to develop new drugs and vaccines, as well as novel drug administration procedures that generate a better response, reduce times, and optimize treatments. Nanotechnology has incorporated in recent years a considerable number of new tools that significantly increase the diversity of mechanisms for the administration of anti-tuberculosis drugs. Therefore, the present review briefly describes the current state of drug resistance in tuberculosis, as well as the general characteristics of nanoparticles being evaluated as tools to transport new antibiotics against tuberculosis.

Nanopartículas como transportadores de fármacos: una herramienta prometedora contra la tuberculosis / Nanoparticles as drug transporters: a promising tool against tuberculosis

RESUMEN La Organización Mundial de la Salud (OMS) ubica a la tuberculosis (TB) como uno de los problemas de salud más preocupantes en la actualidad, y señala que se requieren de acciones novedosas para controlar su expansión y, de esta manera, alcanzar una de las metas establecidas en los Objetivos de Desarrollo Sostenible: reducir para 2030 la morbilidad e incidencia de TB. Para lograr este objetivo, está claro que las herramientas empleadas actualmente para su diagnóstico y tratamiento ya no son las adecuadas. En este sentido, es necesario desarrollar nuevos medicamentos y vacunas, así como novedosos procedimientos de administración de fármacos que generen una mejor respuesta, disminuyan el tiempo y optimicen los tratamientos. La nanotecnología ha incorporado en los últimos años un gran número de nuevas herramientas que incrementan considerablemente, la diversidad de mecanismos para la administración de tratamientos antituberculosos. Dicho esto, la presente revisión describe brevemente el estado actual de la farmacorresistencia en TB, así como las características generales de las nanopartículas que están evaluándose como herramientas para transportar antibióticos antituberculosos.

ABSTRACT The World Health Organization (WHO) places Tuberculosis (TB) as one of the most important health problems today. According to the WHO, this disease requires novel actions to control its expansion and, in this way, achieve one of the goals established in the sustainable development goals: to reduce TB morbidity and incidence by 2030 and regain control. To achieve this goal, the tools currently used for diagnosis and treatment are no longer adequate. In this sense, it is necessary to develop new drugs and vaccines, as well as novel drug administration procedures that generate a better response, reduce times, and optimize treatments. Nanotechnology has incorporated in recent years a considerable number of new tools that significantly increase the diversity of mechanisms for the administration of anti-tuberculosis drugs. Therefore, the present review briefly describes the current state of drug resistance in tuberculosis, as well as the general characteristics of nanoparticles being evaluated as tools to transport new antibiotics against tuberculosis.

[Genetic diversity of Mycobacterium tuberculosis circulating in the jurisdiction V from Jalapa, Veracruz, Mexico]. / Diversidad genética de Mycobacterium tuberculosis circulando en la jurisdicción V de Jalapa, Veracruz, México.

BACKGROUND: The state of Veracruz is placed in southeastern Mexico and has a high prevalence of tuberculosis (TB) and drug resistance. Nevertheless, the composition of circulating genotypes in the central region of the state is partially known. AIM: To characterize the genetic diversity of TB in the sanitary jurisdiction V of the state of Veracruz. METHODS: A cross-sectional study was conducted among clinical isolates from patients with TB living in the jurisdiction V, in Jalapa Ver., Mexico. Sensitivity to first-line drugs was determined, and genotyping was performed by spoligotyping and MIRU-VNTR 15 loci. RESULTS: Among the 74 isolates analyzed, resistance to one drug was observed in 44 isolates. L4 (EuroAmerican) was the major lineage identified. Five sublineages were the most abundant; H (40%), T (22%), LAM (16%), X (13%) and U (7%). Only 32% of the isolates were clustered by spoligotype and 40% were placed in ten clonal complexes. CONCLUSIONS: This is the first description of the genetic structure of TB in the central region of Veracruz. The diversity of genotypes could contribute to its dispersion. This information will be useful for the development of interventions to reduce the impact of TB in the population.

Barreras y factores asociados al uso de mecanismos de coordinación entre niveles de atención en México / Barriers and factors associated with the use of coordination mechanisms between levels of care in Mexico / Entraves e fatores associados ao uso de mecanismos de coordenação entre níveis de atenção no México

Resumen: El objetivo fue analizar el nivel y caracterizar el uso de mecanismos de coordinación clínica entre niveles de atención, y sus factores asociados, en dos redes públicas de servicios de salud en México. Se realizó estudio transversal mediante el cuestionario COORDENA a médicos de atención primaria y especializada del estado de Veracruz. Se encontraron diferencias entre redes y niveles de atención, según el mecanismo. En ambas, la referencia/contrarreferencia es sobre todo utilizada para canalizar al paciente a otro nivel, principalmente por parte de los médicos de atención primaria. Se identificó una alta recepción de referencias por especialistas, pero escasa recepción de contrarreferencias en atención primaria. Ser hombre y reconocer al médico/a de atención primaria como responsable del seguimiento del paciente en su trayectoria asistencial, fueron factores asociados al envío frecuente de la contrarreferencia por especialistas. El informe de alta se utiliza en ambas redes para enviar información clínica al otro nivel, con mayor envío por médicos/as especialistas, y con menor recepción en atención primaria. En ambas redes, el seguimiento a las recomendaciones de los mecanismos para estandarizar la atención clínica (guías de práctica clínica, etc.) por parte médicos/as de atención primaria que de especializada. La utilización de mecanismos de coordinación entre niveles de atención es deficiente y limitada, con mayor uso de mecanismos para transferir información que para la gestión clínica. Se evidencia la necesidad de implementar estrategias que consideren la participación de los profesionales, para favorecer la adaptación local, apropiación y mejorar su uso.

Abstract: The aim was to analyze the level and characterize the use of clinical coordination mechanisms between levels of care, and their associated factors, in two public networks of health services in Mexico. A cross-sectional study was carried out using the COORDENA questionnaire to primary and specialized care physicians in the state of Veracruz. Differences were found between networks and levels of care, according to the mechanism. In both, the referral/counter-referral is mostly used to channel the patient to another level, mainly by primary care physicians. A high reception of referrals by specialists was identified, but few counterreferences in primary care. Being a man and recognizing the primary care physician, as responsible for monitoring the patient in his/her healthcare career, were factors associated with the frequent sending of the counter-referral by specialists. The discharge report is used in both networks to send clinical information to the other level, with more sending by specialist doctors, but with less reception in primary care. In both networks, the follow-up to the recommendations of the mechanisms to standardize clinical care was greater by primary care physicians than specialized ones. The use of coordination mechanisms between levels of care is deficient and limited, with greater use of mechanisms to transfer information than for clinical management. The need to implement strategies that consider the participation of professionals is evident, to favor local adaptation, appropriation and improve their use.

Resumo: O objetivo era analisar o nível e caracterizar o uso de mecanismos de coordenação clínica entre níveis de atenção e seus fatores associados em duas redes públicas de saúde no México. Estudo transversal por meio do questionário COORDENA aplicados a médicos da atenção primaria e especializada do Estado de Veracruz. Foram encontradas diferenças entre redes e níveis de atenção conforme o mecanismo. Em ambas, a referência/contrarreferência é sobre tudo utilizada para encaminhar o paciente para outro nível, principalmente por parte dos médicos da atenção primária. Foi identificado um alto recebimento de referências por especialistas, porém raras são as contrarreferências na atenção primária. Ser homem e reconhecer o médico/a de atenção primária como responsável pelo acompanhamento do paciente na sua trajetória de atendimento foram fatores associados ao envio frequente da contrarreferência por especialistas. O relatório de alta é utilizado nas duas redes para enviar informação clínica ao outro nível, com mais envios por médicos/as especialistas e menos recebimentos na atenção primária. Em ambas as redes, a observância das recomendações de mecanismos para padronizar a atenção clínica foi maior por parte dos médicos/as da atenção primária do que da especializada. O uso de mecanismos de coordenação entre níveis de atenção é deficiente e limitado, com o emprego maior de mecanismos para transmitir informação do que para a gestão clínica. Ficou evidenciada a necessidade de implementar estratégias que levem em conta a participação dos profissionais, para promover a adequação local, a apropriação e melhorar a sua utilização.