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A nomogram for relapse/death and contemplating adjuvant therapy for parathyroid carcinoma
(Elsevier, 2023-08) Silva-Figueroa, Angélica
The staging systems proposed to date for PC have not been adequately validated. Recent multivariate have been carried out in large national and international databases to search for prognostic factors for survival and relapse in PC. Advanced age, male gender, high PTH and calcium levels at diagnosis, tumor size >30 mm, angioinvasion, presence of distant metastases, and specific tumor microenvironmental factors, such as parafibromin staining and tumor-infiltrating lymphocytes, have been strongly correlated with decreased OS and CSS, and with increased risk of local and distant recurrence. Because of their prognostic significance, these host and tumor factors should be included in any PC staging system. However, there is a need to promote collaborative PC registry plans to collate data on the above prognostic factors as well as new ways in a standardized global registry. Such a resource could be used to stratify patients with PC and identify those at high risk for relapse and death who may benefit from strict surveillance or adjuvant therapeutic care. PC is an indolent cancer with a high recurrence rate of 3 to 5 years after the first surgical intervention. Progression can remain dormant for decades until patients present with distant metastases. Such heterogeneity and neoplastic latency make OS an ambitious endpoint to achieve, and pursuing OS contradicts the actual needs of patients with this endocrine neoplasm. More relevant endpoints focus on achieving normal blood biochemistry to improve quality of life and intervening to lengthen recurrence/metastasis event-related-free survival. Surgery remains the standard treatment because traditional therapies, such as EBRT and chemotherapy, do not benefit patients with advanced unresectable or metastatic PC, new options are emerging for patients with PC. Genomic and phenotypic profiling can continue to inform personalized therapeutic strategies to expand the clinical options available to patients with PC.
A Respiratory Therapist-Driven High-Flow Nasal Cannula Liberation Protocol at High Altitude.
(SAGE Publications, 2026-08-26) Vásquez Hoyos, Pablo
Background: High-flow nasal cannula (HFNC) liberation strategies in pediatric intensive care often transition patients directly from HFNC to room air. At high altitude, oxygen requirements may persist after flow-dependent respiratory support is no longer needed. We evaluated the association between a protocolized, respiratory therapist-driven HFNC liberation strategy and time to successful liberation from high-flow support in children with acute respiratory failure. Methods: We conducted a retrospective cohort study using prospectively collected LARed Network registry data from a tertiary PICU in Bogotá, Colombia (2,600 m altitude). In September 2022, the unit implemented an HFNC liberation strategy designed to separate persistent oxygen requirement from ongoing need for high-flow support. The primary analysis included the first HFNC episode per PICU admission from March 2018 to March 2025. The primary outcome was time to successful HFNC liberation. Kaplan-Meier curves and multivariable Cox regression were used; gamma log-link models were used for sensitivity analyses, including a prespecified bronchiolitis subgroup. Results: We included 1,086 PICU admissions, 627 before and 459 after implementation. Median HFNC duration decreased from 59.8 h (interquartile ranges [IQR] 34.7-91.4) to 53.1 h (IQR 32.3-80.5, P = .01). Kaplan-Meier analysis showed earlier HFNC liberation after implementation (log-rank P < .01). Implementation was associated with earlier liberation in adjusted Cox regression (hazard ratio 1.17, 95% CI 1.03-1.34, P = .02). PICU stay decreased from 4.7 days (IQR 3.2-6.9) to 4.0 days (IQR 2.9-5.8, P < .01). In bronchiolitis, implementation was associated with an 18.2% relative reduction in HFNC duration (95% CI 7.7-27.5%, P < .01). Conclusions: In a high-altitude PICU, a respiratory therapist-driven HFNC liberation strategy was associated with earlier liberation from high-flow support. A strategy that preserves oxygen delivery while testing tolerance of minimal flow may be useful in high-altitude settings
A Systematic Review and Meta-Analysis on the Prevalence of Variants in the Pancreaticobiliary Duct Junction and Its Association with Cancer
(MDPI, 2025-04-25) Valenzuela Fuenzalida, Juan José
The objective of this study was to describe the anatomical variants of the pancreaticobiliary junction and how its position or structural change could be associated with hepatic, duodenal, and pancreatic clinical complications. Methods: We searched MEDLINE, Scopus, Web of Science (WOS), Google Scholar, CINAHL, and EMBASE databases from their inception up to September 2024. Results: Two authors independently performed the search, study selection, data extraction, and assessed the methodological quality with an assurance tool for anatomical studies (AQUA). Finally, the pooled prevalence was estimated using a random effects model. A total of 59 studies with a total of 22,752 participants were included in this review. The overall prevalence of the anomalous pancreaticobiliary junction (APBJ) variant was 12% (95% CI = 6% to 18%). The prevalence of cancer associated with variants of APBJ was 29% (95% CI = 23% to 34%). Conclusions: In the present anatomical systematic review and meta-analysis, we found that a longer common channel correlated with a higher prevalence of bile duct or gallbladder malignancy, due to the backward flow of bile which occurs as a result of the position and distance of the bile ducts, as well as pancreatic failing. Hence, APBJs are of great interest for gastroduodenal surgeons.
A Systematic Review of Anatomical Variations of the Inferior Thyroid Artery: Clinical and Surgical Considerations
(MDPI, 2025-07-23) Bruna-Mejías, Alejandro
The inferior thyroid artery (ITA) is an essential component of the thyroid gland’s vasculature, with significant clinical and surgical implications due to its anatomical variability. This systematic review aimed to describe the prevalence of ITA anatomical variants and their association with clinical conditions or surgical implications. Methods: A comprehensive search was conducted in MEDLINE, Web of Science, Google Scholar, CINAHL, Scopus, and EMBASE on 20 November 2025. Eligibility criteria included studies reporting on the presence of ITA variants and their correlation with pathologies. Two authors independently screened the literature, extracted data, and assessed methodological quality using the AQUA and JBI tools. Results: Of the 2647 articles identified, 19 studies involving 1118 subjects/cadavers were included. Variations in ITA origin, absence, and additional arteries were reported, with the most common variant being direct origin from the subclavian artery. Clinically, these variations were associated with increased risk of intraoperative hemorrhage, potential nerve damage, and challenges in preoperative planning, particularly during thyroidectomy and other neck procedures. Conclusions: Understanding the anatomical diversity of the ITA is crucial for reducing surgical risks and improving patient outcomes. The review highlighted the need for more standardized research protocols and comprehensive data reporting to enhance the quality of evidence in this domain. Preoperative imaging and thorough anatomical assessments tailored to individual patient profiles, considering ethnic and gender-related differences, are essential for safe surgical interventions in the thyroid region.
A Systematic Review with a Meta-Analysis of the Morphological Variants of the Corpus Callosum: Related Neurocognitive Clinical Implications
(Elsevier, 2025) Valenzuela Fuenzalida, Juan José
Background: Corpus callosum agenesis (CCA) occurs in approximately 1 in every 4000 births and is identified in 3–5% of individuals evaluated through neuroimaging for neurodevelopmental disorders. The combined prevalence of CCA and hypoplasia is estimated to range from 1.8 to 10 in every 10,000 births. Methods: The online databases Medline, Scopus, Web of Science, Google Scholar, Cumulative Index to Nursing and Allied Health Literature, and Latin American and Caribbean Literature in Health Sciences were searched until May 2025. Two authors independently conducted the search, selected the studies, and extracted the data. The methodological quality of the studies was assessed using the Anatomical Quality Assessment tool. A random effects model was used to estimate the pooled prevalence. Results: A total of 46 studies met the established selection criteria. In this analysis, 15 articles were included in the meta-analysis, which involved a total of 5,118,037 subjects. The overall prevalence of CCA was 18% (confidence interval = 10%–25%). The subgroup analysis revealed a significant difference in the prevalence of CCA among the Asian continent compared to the other four continents (P-value 0.001). Conclusions: Early diagnosis of CCA during the fetal stage can enable specialists to implement more effective treatments and reduce the likelihood of neurofunctional impairments. Furthermore, understanding the morphological characteristics of CCA can assist in making an early and accurate diagnosis, minimizing the need for differential diagnoses that could interfere with the functioning of the interhemispheric connection system and brain functional connections.
Activity and Outcomes of a Multidisciplinary Sepsis Unit: Fifty Thousand Consultations over Thirteen Years
(MDPI, 2026-07-30) Borges-Sa, Marcio
Resumen: Background. Sepsis is a leading, time-dependent cause of in-hospital death, and guidelines now prioritize organized care such as code-sepsis protocols. Yet little is known about the long-term activity, organization and outcomes of permanent, hospital-scale programs. We characterized the activity of a hospital-wide multidisciplinary sepsis unit (MSU) over thirteen years and evaluated mortality trends. Methods. Retrospective cohort study using the registry of a hospital-wide MSU (2011-2023). The analysis unit was the sepsis event. Activity, referral pathways, interventions, follow-up and mortality were analyzed; temporal trends used multivariable logistic regression and standardized mortality ratios (SMR). Results. The unit attended 10,874 patients across 15,723 events and 50,925 consultations (median age 67; 59.3% men), referred mainly through the sepsis code (45.0%) and, increasingly, proactive early-warning detection (15.2%). An antibiotic change was recommended in 57.2% of events, and 89.8% of all suggested changes were implemented. Follow-up was sustained (median 3 visits; 61.8%). In-hospital mortality was 7.6%, and 11.8% in protocol-confirmed sepsis. Crude mortality did not fall, but severity rose (organ dysfunctions 1.67 to 2.72; septic shock 8 to 13%; both p < 0.001) with stable age; after adjustment the calendar-year effect disappeared (adjusted OR 1.00/year p = 0.70) and the SMR stayed near 1.0, including pandemic years. Age, ICU admission (OR 2.65) and organ-dysfunction count (OR 1.37) independently predicted death. Conclusions. Over thirteen years, this hospital-wide MSU delivered large-scale, multi-channel, longitudinal care to an increasingly severe population while maintaining stable risk-adjusted mortality, supporting the long-term feasibility of a model integrating early detection, multidisciplinary decision-making, antimicrobial stewardship and follow-up.
Activity and Outcomes of a Multidisciplinary Sepsis Unit: Fifty Thousand Consultations over Thirteen Years
(MDPI, 2024-07-26) Borges-Sa, Marcio
Background. Sepsis is a leading, time-dependent cause of in-hospital death, and guidelines now prioritize organized care such as code-sepsis protocols. Yet little is known about the long-term activity, organization and outcomes of permanent, hospital-scale programs. We characterized the activity of a hospital-wide multidisciplinary sepsis unit (MSU) over thirteen years and evaluated mortality trends. Methods. Retrospective cohort study using the registry of a hospital-wide MSU (2011–2023). The analysis unit was the sepsis event. Activity, referral pathways, interventions, follow-up and mortality were analyzed; temporal trends used multivariable logistic regression and standardized mortality ratios (SMR). Results. The unit attended 10,874 patients across 15,723 events and 50,925 consultations (median age 67; 59.3% men), referred mainly through the sepsis code (45.0%) and, increasingly, proactive early-warning detection (15.2%). An antibiotic change was recommended in 57.2% of events, and 89.8% of all suggested changes were implemented. Follow-up was sustained (median 3 visits; 61.8%). In-hospital mortality was 7.6%, and 11.8% in protocol-confirmed sepsis. Crude mortality did not fall, but severity rose (organ dysfunctions 1.67 to 2.72; septic shock 8 to 13%; both p < 0.001) with stable age; after adjustment the calendar-year effect disappeared (adjusted OR 1.00/year, p = 0.70) and the SMR stayed near 1.0, including pandemic years. Age, ICU admission (OR 2.65) and organ-dysfunction count (OR 1.37) independently predicted death. Conclusions. Over thirteen years, this hospital-wide MSU delivered large-scale, multi-channel, longitudinal care to an increasingly severe population while maintaining stable risk-adjusted mortality, supporting the long-term feasibility of a model integrating early detection, multidisciplinary decision-making, antimicrobial stewardship and follow-up.
Actualización sobre el manejo inicial de fracturas expuestas para médicos generales y especialistas. Revisión panorámica de la literatura
(Revista Médica de Chile, 2026-03-04) Frey Moreno, Catalina
Las fracturas expuestas representan una carga significativa para la salud pública debido al riesgo de infección, secuelas y mortalidad. El manejo inicial es crucial para evitar o reducir estas complicacio-nes. Objetivo: Describir las opciones actuales de manejo inicial de fracturas expuestas en el servicio de urgencias por el médico general y especialista. Metodología: Revisión panorámica del manejo de fractura expuesta realizada entre octubre y noviembre 2024, utili-zando términos MESH en PubMed y SCIELO en inglés y español. Se incluyeron artículos de los últimos 5 años (2019-2024) abordando los pilares del manejo en urgencias: antibioticoterapia, manejo del dolor, inmovilización y desbridamiento. Resultados: De 2.883 artícu-los obtenidos en PubMed y SCIELO, 30 estudios fueron incluidos. Se mantienen los pilares de tratamiento para disminuir complicaciones: antibioticoterapia, manejo del dolor, inmovilización, desbridamiento y cierre de la herida. Discusión: La antibioticoterapia debe ser precoz, idealmente antes de 60 minutos, aseo quirúrgico antes de 24 horas de la lesión según las características de la fractura, cierre precoz de la herida. También, manejo del dolor asociado a reducción e inmovi-lización y/o fijación. Además, considerar el uso de antibioticoterapia local y continua o cierre-asistido-por-vacío (VAC) por especialistas. Es importante la creación de protocolos específicos para el sistema de salud chileno. Conclusiones: El médico general debe conocer los tiempos de administración antibiótica y desbridación, optimizar el manejo del dolor farmacológicamente, inmovilizar la fractura e indicar la profilaxis antitetánica. El especialista debe procurar un aseo quirúrgico y cierre de la herida precoz, considerando asociar antibiótico local o VAC para favorecer el pronóstico del paciente. El manejo actualizado y protocolizado de esta patología es relevante para prevenir su morbimortalidad.
Adenovirus Versus Respiratory Syncytial Virus in Children With Severe Viral Acute Respiratory Failure: A Multicenter Latin American Cohort.
(Wolters Kluwer Health, 2026-08-26) Barajas-Romero, Juan Sebastián
Background: Respiratory syncytial virus (RSV) commonly causes severe lower respiratory tract disease. Adenovirus is detected less often, but severe pneumonia may occur. The pediatric intensive care unit (PICU) course associated with adenovirus detection compared with RSV-only detection is not well defined. Methods: We studied clinician-tested, virus-positive PICU admissions of children aged 1 month to 18 years from 37 PICUs in 7 Latin American countries (2017-2025). Children with RSV and/or adenovirus detection who used respiratory support were grouped as RSV-only, adenovirus-only or RSV-adenovirus codetection. The primary outcome was PICU death or worse functional status at discharge. Adjusted associations were estimated with logistic regression; Firth penalization was used for mortality. Results: Among 3196 PICU admissions, 2859 had RSV-only, 257 adenovirus-only and 80 codetection. PICU mortality was 12/257 (4.7%) in adenovirus-only, 13/2859 (0.5%) in RSV-only and 2/80 (2.5%) in codetection. Compared with RSV-only detection, adenovirus-only detection was associated with mortality [adjusted odds ratio (OR): 10.56; 95% confidence interval (CI): 4.57-24.43] and with PICU death or worse functional status at discharge [21/222 (9.5%) vs 45/2308 (1.9%); adjusted OR: 6.57; 95% CI: 3.59-12.03]. Among nonsurvivors, the median PICU day of death was 3 (IQR: 2-6) with adenovirus-only detection and 8 (IQR: 3-9) with RSV-only detection. Conclusions: In this multicenter Latin American PICU cohort, adenovirus-only detection was associated with a higher-risk acute course than RSV-only detection, including higher mortality and worse functional status at PICU discharge.
The Akin osteotomy without fixation in open hallux abducto-valgo correction surgery: A single center retrospective analysis of 286 cases
(Elsevier, 2023-01-06) Testa, Enrique Adrián
Between 2011 and 2018, 222 patients, 286 feet (147 left, 139 right) met the inclusion criteria. We found an average difference between pre-op and post-op at 3 months of distal articular set angle (DASA) of 7.0 degrees and average interphalangeal joint obliquity angle (IPOA) of 12.0 degrees (p < 0.001). All cases achieved fusion but in 5.9 % (17/289 cases) of cases, we observed delayed consolidation. The average union time in these cases was 22.1 weeks. Hyperextension of the distal fragment (mal union in plantar flexion) was observed in 7 cases (2.4 %). None of the 7 cases required correction. Out of 286 surgeries, 8 (2.7 %) required reoperation, but only one case for a hypocorrection required Akin's re osteotomy. Regarding the inter- and intra-observer correlations, good and excellent reliability are observed for all parameters under consideration. Conclusion The absence of internal fixation would appear not to impair osteotomy healing and complication rates compared with techniques with fixation would not appear to be worse. The results are encouraging; nevertheless, we believe that further studies need to be performed in order to confirm the data.
Análisis comparativo entre satisfacción en cuanto al aprendizaje online y desempeño académico de alumnos de medicina durante la pandemia
(Universidad Finis Terrae (Chile) Facultad de Medicina, 2022) Rodas Krause, Catherina de los Angeles; Soto Suazo, Mauricio, prof. guía
En el año 2020 nos vimos enfrentados a una crisis sanitaria secundaria a la pandemia por virus SARSCOV2, en este contexto, facultades del área de la salud tuvieron que buscar nuevas formas de aprendizaje puesto que los campos clínicos para hacer docencia cerraron para priorizar su función asistencial. En tales circunstancias, se realizaron actividades virtuales para estudiantes de tercer año, que apuntaban a perfeccionar técnicas de anamnesis, examen físico y desarrollo de razonamiento clínico. Teniendo en cuenta lo anterior, se hace necesario analizar la opinión de los estudiantes con respecto a su nivel de aprendizaje durante el año, para así, adoptar medidas de mejora y plantear las bases de esta nueva forma de enseñar medicina. A raíz de lo anterior, se plantea la siguiente interrogante, ¿Cuál es la relación entre la satisfacción del estudiante sobre su adquisición de habilidades y destrezas de la asignatura de semiología dictada en modalidad a distancia y su rendimiento académico? Hipótesis: La opinión del estudiante sobre su adquisición de destrezas y habilidades en la asignatura de semiología en modalidad a distancia se relaciona con su rendimiento académico. Objetivo primario: Describir el nivel de satisfacción de los alumnos de tercer año de medicina que cursaron la asignatura de semiología médica con respecto a su aprendizaje de habilidades clínicas, comunicacionales y de razonamiento clínico. Se aplicará un cuestionario adaptado para evaluar satisfacción el cual se validará, se caracterizará la muestra y, además, los resultados se cotejarán con las calificaciones de los estudiantes. Se espera que exista una relación entre el nivel de satisfacción y el rendimiento de los estudiantes.
Análisis de la epidemia estacional por virus respiratorios y virus respiratorio sincicial (VRS) del año 2023 comparado con cohorte prepandemia (2015-2019) en Chile
(Sociedad Chilena de Pediatría, 2025) Díaz, Franco
Durante la pandemia de COVID-19, las infecciones respiratorias pediátricas disminuyeron drásticamente a nivel mundial. Sin embargo, en el otoño-invierno de 2023, estas enfermedades resurgieron de manera inusual, causando estrés en el sistema de salud. Comparando los datos del 2023 con los del quinquenio prepandemia del Departamento de Estadísticas e Información de Salud (DEIS) de Chile, observamos que la magnitud y frecuencia de las enfermedades respiratorias pediátricas fueron similares. No obstante, el estrés en el sistema de salud se debió al inicio temprano de la demanda, la sincronicidad de grupos etarios, la heterogeneidad geográfica y la capacidad de respuesta global y local. En la Región Metropolitana (RM), los casos no aumentaron en número, pero se presentaron 4 semanas antes. En las regiones central, centro-sur y sur, los casos aparecieron más temprano y durante un periodo más corto, resultando en un pico de hasta 4 veces más en hospitalizaciones y consultas de urgencia. La eficacia de las políticas públicas, como los cambios en programas educacionales y la inmunización contra el virus respiratorio sincicial (VRS), requiere un análisis objetivo y multisectorial. Es necesario ajustar las políticas para evitar la sobrerrepresentación de la RM y fomentar la colaboración público-privada para perfeccionar la información de la carga del VRS, y así mejorar los estándares de atención, tratamientos y su disponibilidad a lo largo de Chile.
Analysis of predictors for spinal fusion in degenerative lumbar stenosis in Chile based on diagnosis-related groups
(Gavin Publishers, 2024-01-03) Molina, Marcelo
Introduction: Degenerative Lumbar spinal stenosis (DLSS) is the most common cause of spine surgery for patients above 55 years. Surgery options include decompression alone or with spinal fusion. The DRG system uses classification algorithms that categorize patients into groups with similar clinical and resource consumption characteristics, using ICD-10 nomenclature for diagnoses and ICD-9-CM for procedures. Objective: Identify clinical and epidemiological variables of DLSS surgery patients based on Chile’s DRG system data and define factors associated with arthrodesis as a complement to decompression. Study Design: Retrospective observational study. Methods: This study used the national DRG database to analyze factors predicting the need for fusion in patients with DLSS. Data from 31 public hospitals in Chile were analyzed for patients discharged between 2020 and 2022. Variables considered included age, gender, presence of other spinal pathologies, and attending physician specialty. For the descriptive analysis of qualitative variables, frequencies and percentages were used.The study used univariate and multivariate logistic regression analysis. A statistical significance level of less than 0.05 was considered. Results: We analyzed 1024 patients with lumbar spinal stenosis and found that 54.6% were female and 45.4% were male (p= 0.0034). The majority of the patients (57.4%) were aged between 60 and 79 years. 75% of orthopedic surgeons opted for decompression plus arthrodesis, while neurosurgeons preferred decompression alone in 73% of cases. The most significant predictors for decompression with fusion were the physician’s specialty in orthopedic surgery, female sex, and the presence of other spinal pathologies such as scoliosis, herniated disc, and spondylolisthesis. Patients treated by an Orthopedic Surgeon had an 8.2 times greater probability of undergoing decompression plus arthrodesis as compared to those treated by a Neurosurgeon. Additionally, the presence of spondylolisthesis increased the probability of decompression with fusion by 6.2 times, and the presence of scoliosis increased it by 6.6 times. Neurosurgeons opted for decompression alone in 89.7% of the cases with DLSS stenosis and herniated disc, while only 48.9% of orthopedic surgeons opted for the same option (p=0.0000). Conclusion: Our study based on DRG records from public hospitals in Chile has identified certain factors linked to a higher frequency of spinal arthrodesis. These factors include the surgery being performed by orthopedic surgeons, patients aged between 40 and 60 years old, the presence of degenerative spondylolisthesis and degenerative scoliosis, and the absence of a herniated disc.
Anatomical variants in pancreatic irrigation and their clinical considerations for the pancreatic approach and surrounding structures: a systematic review with meta-analysis
(MDPI, 2025-02-19) Valenzuela Fuenzalida, Juan José
Background and Objectives: The pancreas receives blood through a complex network of multiple branches, primarily originating from the celiac trunk (CeT) and the superior mesenteric artery (SMA). This blood supply is structured into three main arterial groups, each serving different regions of the pancreas to effectively support its endocrine and exocrine functions. Materials and Methods: The databases Medline, Scopus, Web of Science, Google Scholar, Cumulative Index to Nursing and Allied Health Literature (CINAHL) and Latin American and the Caribbean Literature in Health Sciences (LILACS) were searched until January 2025. Methodological quality was evaluated using an assurance tool for anatomical studies (AQUA). Pooled prevalence was estimated using a random effects model. Results: A total of sixteen studies met the established selection criteria in this study for meta-analysis. Pancreatic irrigation variants presented a prevalence of 11.2% (CI: 7–14%) and a heterogeneity of 88.2%. The other studies were analyzed by subgroups, showing statistically significant differences in the following subgroups: (1) sample type—a larger sample of images analyzed in the included studies (p = 0.312), which did not show statistically significant differences; (2) geographical region (p = 0.041), which showed a greater presence in the Asian population studied, and this was statistically significant; and (3) sex (male or female) (p = 0.12), where there were no statistically significant differences. Conclusions: The discovery of variations in pancreatic irrigation is common due to the numerous blood vessels involved in supplying this vital organ. Understanding different vascular patterns (such as those from the splenic and mesenteric arteries) is crucial for surgical interventions on the pancreas. For transplant patients, a thorough vascular analysis of both the donor and recipient is essential. Variations can impact blood flow and compatibility, potentially leading to transplant rejection if not addressed. To enhance outcomes, it is recommended to develop more accurate imaging tools for pre-surgical analysis, necessitating ongoing research in this area.
Anatomical variants of the origin of the coronary arteries: a systematic review and meta-analysis of prevalence
(MDPI, 2024-06-24) Valenzuela Fuenzalida, Juan José
Purpose: The most common anomaly is an anomalous left coronary artery originating from the pulmonary artery. These variants can be different and depend on the location as well as how they present themselves in their anatomical distribution and their symptomatological relationship. For these reasons, this review aims to identify the variants of the coronary artery and how they are associated with different clinical conditions. Methods: The databases Medline, Scopus, Web of Science, Google Scholar, CINAHL, and LILACS were researched until January 2024. Two authors independently performed the search, study selection, and data extraction. Methodological quality was evaluated using an assurance tool for anatomical studies (AQUA). Pooled prevalence was estimated using a random effects model. Results: A total of 39 studies met the established selection criteria. In this study, 21 articles with a total of 578,868 subjects were included in the meta-analysis. The coronary artery origin variant was 1% (CI = 0.8-1.2%). For this third sample, the funnel plot graph showed an important asymmetry, with a p-value of 0.162, which is directly associated with this asymmetry. Conclusions: It is recommended that patients whose diagnosis was made incidentally and in the absence of symptoms undergo periodic controls to prevent future complications, including death. Finally, we believe that further studies could improve the anatomical, embryological, and physiological understanding of this variant in the heart.
Anatomical variants of the renal veins and their relationship with morphofunctional alterations of the kidney: a systematic review and meta-analysis of prevalence
(MDPI, 2024-04-21) Valenzuela Fuenzalida, Juan José
Background: Variations in renal veins are quite common, and most people do not experience issues due to them. However, these variations are important for healthcare professionals, especially in surgical procedures and imaging studies, as precise knowledge of vascular anatomy is essential to avoid complications during medical interventions. The purpose of this study was to expose the frequency of anatomical variations in the renal vein (RV) and detail their relationship with the retroperitoneal and renal regions. Methods: A systematic search was conducted in the Medline, Scopus, Web of Science, Google Scholar, CINAHL, and LILACS databases from their inception until January 2024. Two authors independently carried out the search, study selection, and data extraction and assessed methodological quality using a quality assurance tool for anatomical studies (AQUA). Ultimately, consolidated prevalence was estimated using a random effects model. Results: In total, 91 studies meeting the eligibility criteria were identified. This study included 91 investigations with a total of 46,664 subjects; the meta-analysis encompassed 64 studies. The overall prevalence of multiple renal veins was 5%, with a confidence interval (CI) of 4% to 5%. The prevalence of the renal vein trajectory was 5%, with a CI of 4% to 5%. The prevalence of renal vein branching was 3%, with a CI of 0% to 6%. Lastly, the prevalence of unusual renal vein origin was 2%, with a CI of 1% to 4%. Conclusions: The analysis of these variants is crucial for both surgical clinical management and the treatment of patients with renal transplant and hemodialysis.
Anatomical variants of the vertebral artery and their relationship with craniocervical disorders and surgical considerations: a systematic review and meta‐analysis
(Springer Nature, 2025-05-29) Valenzuela Fuenzalida, Juan José
The vertebral artery (VA) supplies almost one-third of the blood flow to the brain, contributing mainly to its posterior circulation. This article provides a comprehensive overview of the different anatomical variations related to the origin, course, and termination of the VA and associated clinical implications. Data were compiled from numerous published studies accessed from the databases Medline, Scopus, Web of Science, Google Scholar, Cumulative Index to Nursing and Allied Health Literature (CINAHL), and Literature in Health Sciences (LILACS) as of January 2024. Methodological quality was evaluated with an assurance tool for anatomical studies (AQUA). Pooled prevalence was estimated using a random effects model, and differences in VA variant rates were assessed. VA variants were identified that could be separated into three categories: variation in origin, course, and terminal branches. A total of 16 studies met the established selection criteria for the current meta-analysis. VA variations were reported at an overall prevalence of 11% (CI: 7%–15%) and a heterogeneity of 77%. Statistically significantly higher rates were revealed in the following subgroups of the sample: imaging examinations versus cadavers (p = 0.032); right side of the body versus left (p = 0.034); and bilaterally versus unilaterally (p = 0.019). Concerns listed in included studies primarily focused on the possibility of iatrogenic damage during surgical procedures. A few studies also indicated higher rates of VA variants in patients who reported symptoms of recurrent headaches, vertigo, dizziness, and/or syncope. The presence of VA variants is high and can occur in various regions. However, the most important clinical consideration is that individuals with this variant must be constantly monitored since their posterior cerebral circulation could be affected. To avoid iatrogenic damage to the VA, clinicians should employ medical imaging to evaluate its course and branches prior to surgical interventions in the region.
Anatomical variations and abnormalities of the maxillary region and clinical implications: A systematic review and metaanalysis
(Wolters Kluwer Health, 2023-07-05) Valenzuela Fuenzalida, Juan José
Objetivo: El objetivo de esta revisión es investigar y analizar las variaciones anatómicas presentes en el seno maxilar (SM), a través de la examinación de la prevalencia de estas variaciones, así como la correspondiente prevalencia de patologías clínicamente significativas y complicaciones asociadas a ellas. Métodos: El proceso de búsqueda se realizó en las siguientes bases de datos; MEDLINE, SCIELO, WOS, CINHAL, SCOPUS y GOOGLE SCHOLAR, utilizando como términos de búsqueda; “Hueso maxilar”, “Seno maxilar”, “Seno paranasal”, “Variaciones anatómicas”, “Sinusitis” y “Anatomía clínica”. Resultados: Se incluyeron un total de 26 artículos y 12969 muestras, de las cuales se registró el sexo de 12,594 sujetos, dando un total de 5802 hombres y 6792 mujeres. Las variantes reportadas por los incluidos fueron células de Haller, Concha Bullosa, Número de septos, Seno hipoplásico, Agger Nasi, Engrosamiento de la mucosa MS, Desviación del tabique nasal, Ostium accesorio y Células de Onodi. Entre los mencionados, los que presentaron mayor número de estudios (entre 8 y 10 estudios incluidos) fueron: las Células de Haller, la Concha Bullosa y el Número de septos, donde la prevalencia fue de 0,30, 0,36, 0,39 respectivamente. Estas variaciones pueden provocar sinusitis, provocar algunos tipos de tumores o afectar estructuras vecinas que podrían verse comprometidas por esta variación. Conclusión: Como resultado, es ciertamente complejo distinguir la presencia de variaciones anatómicas de anomalías patológicas. Por tanto, el conocimiento de las diferentes variaciones y sus relaciones clínicas podría ser un activo útil para los médicos dedicados a esta región.
Anatomical variations of the mandibular canal and their clinical implications in dental practice: a literature review
(Springer Nature, 2021-02-25) Valenzuela Fuenzalida, Juan José
Introduction The anatomical variations of the mandibular canal have been described according to the number of additional branches it presents, bifid and trifid. Within the bifids we can also find subtypes of variations such as the retromolar man- dibular canal. These anatomical variations can have important clinical implications for the work of dental professionals. Methods A systematic search of the literature was carried out in different databases that met the following criteria: articles published between 2000 and 2020, and articles that established a clinical correlation with variations in the mandibular canal. Results After applying inclusion and exclusion criteria, 32 articles were obtained, in which the variations of the mandibular canal were identified, their prevalence and incidence, which was very varied between the different articles, it was also found that the CBCT was the main technique to identify the anatomical variations of the mandibular canal. Lastly, the anatomical variations of the mandibular canal have a direct clinical correlation with pre-surgical, intra-surgical and postsurgical com- plications in pathologies that require surgical intervention. Conclusions The anatomical variations of the mandibular canal have a high incidence, so knowing them is of vital impor- tance both for clinicians and anatomy professors who provide morphological training. We believe that research should focus on describing and diagnosing the causes of these anatomical variations. That said, there is also a continuous challenge for all health professionals to learn about the different anatomical variations that the human body presents and how these can affect clinical practice.
Anatomy of vertebral artery hypoplasia and its relationship with clinical implications: a systematic review and meta-analysis of prevalence
(Springer, 2024-05-19) Valenzuela Fuenzalida, Juan José
Purpose: The vertebral artery (VA) is a vital branch of the subclavian artery, coursing through the transverse foramina of the cervical vertebrae, and playing a crucial role in irrigating the posterior region of the arterial cerebral circle, also known as the Polygon of Willis. Among the various possible alterations that can affect the VA, vertebral artery hypoplasia (HAV) emerges as a significant variant. This study aims to discern the anatomical features of HAV and its correlation with the clinical conditions of the posterior cerebral circulation. Methods: The databases Medline, Scopus, Web of Science, Google Scholar, CINAHL, and LILACS were searched until January 2024. Two authors independently performed the search, study selection, and data extraction. Methodological quality was evaluated with an assurance tool for anatomical studies (AQUA). Pooled prevalence was estimated using a random effects model. Results: A total of 24 studies met the established selection criteria, with a total of 8847 subjects. In this study, 6 articles were included for the meta-analysis with a total of subjects. The average prevalence of VAH reported in each study was 11% (95% CI 10-12%); the studies had a heterogeneity of 41% based on the funnel plot and a low risk of bias. Conclusion: The prevalence of VAH is low, but in the presence of this condition, the changes are mainly in diameter rather than morphological. If it is present, some clinical safeguards must be taken to avoid complications such as stroke.

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