Browsing by Author "Meissner, Arturo"

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    Dexmedetomidine ameliorates gut lactate production and impairment of exogenous lactate clearance in an endotoxic sheep model
    (2015) Hernández P., Glenn; Tapia, Pablo; Bruhn, Alejandro; Soto, Dagoberto; Alegría, Leyla; Jarufe Cassis, Nicolás; Menchaca, Rodrigo; Meissner, Arturo; Vives, María Ignacia; Ospina Tascón, Gustavo A.; Luengo, Cecilia; Bakker, Jan
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    Do Patients Older Than 60 Years With Inflammatory Bowel Disease Have More Vertebral Fractures Than Age-matched Controls? A Study Using Abdominal and Pelvic CT Scans With Sagittal Reformatting as Screening Tool.
    (2020) Besa Vial, Pablo José; Meissner, Arturo; Ledermann, Gerardo; Pérez Valenzuela, Javier; Vergara López, María; Álvarez Lobos, Manuel; Urrutia Escobar, Julio Octavio
    Introduction: Inflammatory bowel disease (IBD) has been associated with metabolic bone disease and increased fractures. This association is directly influenced by the disease and indirectly influenced by treatment. Therefore, patients with IBD could develop an elevated risk of osteoporotic fractures, particularly vertebral compression fractures (VCFs); however, symptomatic VCFs have not been shown to be more common in these patients. Our study evaluated the prevalence of VCF, independent of the presence of spinal symptoms, in IBD patients. Methods: We assessed IBD patients previously enrolled in a prospective cohort. All patients from that cohort who underwent computed tomography (CT) scans for nonspinal conditions were evaluated to detect the presence of VCFs. VCFs were classified using the Genant scheme. We evaluated whether patients with or without VCF differed in demographic data, type of IBD, treatment received and time from diagnosis. We used logistic regression to assess the independent effect of each variable. Results: In total, 6.5% of these patients had at least one VCF. Most fractures were Genant I (77%) and mostly at the thoracolumbar junction (T11 to L2, 65%). Bivariate and logistic regression analyses showed that age was the only variable independently associated with VCF (OR 1.12, 1.05 to 1.19). Conclusion: VCFs are not unusual in OBD patients. Radiologists and clinicians should specifically look for the presence of VCFs in patients with IBD, particularly the elderly, by using abdominal and pelvic CT scans.
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    Evaluación de la microcirculación con sidestream dark field (SDF) Microscan® como método de monitorización en microcirugía en modelo porcino
    (2016) Yáñez, Ricardo; Cifuentes, Ignacio; Rodríguez, José Ramón; Salisbury, Carolina; Dagnino, Bruno; Guerra Sánchez, Claudio Alejandro; Meissner, Arturo; Menchaca, Rodrigo; Hernández P., Glenn
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    Straight antegrade humeral nailing and risk of iatrogenic injury of supraspinatus tendon footprint: An MRI study
    (2023) Contreras, Julio J.; Meissner, Arturo; Valenzuela, Alfonso; Liendo, Rodrigo; de Marinis, Rodrigo; Calvo, Claudio; Soza, Francisco
    Background: Straight antegrade humeral nailing (SAHN) is associated with excellent clinical results in proximal humerus fractures. The optimal entry point is the top of the humeral head. However, the anatomy is variable, and the entry point can affect supraspinatus tendon footprint (SSP-F) or fracture reduction. The aim of this study was to analyze the relationship between the SSP-F and SAHN entry point by analyzing magnetic resonance imaging (MRI) studies of the humerus.Methods: In total 58 MRI studies of entire humerus were reviewed. The mean age was 51.6 +/- 12.4 years, with 40 female patients. The distance between the SSP-F and the SAHN insertion point (critical distance: CD), the width of the footprint, and the neck-shaft angle (NSA) were measured. Univariate and multivariate analysis were performed.Results: The mean CD was 7.51 mm +/- 2.81 (0-12.9 mm) with 51.7% of proximal humerus "critical type" (CD <8 mm). The CD was found to be lower in females, with no difference found with varying age (62.5% "critical type"). CD correlated with NSA (linear regression). "Critical type" correlated with female gender and NSA (logistic regression).Discussion: More than half of the humerus are "critical types" as to SAHN and may, therefore, be at risk for procedure-related complications.