Influence of random uncertainties of anisotropic fibrous model parameters on arterial pressure estimation

This paper deals with a stochastic approach based on the principle of the maximum entropy to investigate the effect of the parameter random uncertainties on the arterial pressure. Motivated by a hyperelastic, anisotropic, and incompressible constitutive law with fiber families, the uncertain parameters describing the mechanical behavior are considered. Based on the available information, the probability density functions are attributed to every random variable to describe the dispersion of the model parameters. Numerous realizations are carried out, and the corresponding arterial pressure results are compared with the human non-invasive clinical data recorded over a mean cardiac cycle. Furthermore, the Monte Carlo simulations are performed, the convergence of the probabilistic model is proven. The different realizations are useful to define a reliable confidence region, in which the probability to have a realization is equM to 95%. It is shown through the obtained results that the error in the estimation of the arterial pressure can reach 35% when the estimation of the model parameters is subjected to an uncertainty ratio of 5%. Finally, a sensitivity analysis is performed to identify the constitutive law relevant parameters for better understanding and characterization of the arterial wall mechanical behaviors.

Prevalence and Factors Associated with Chronic Low Back Pain in the Mining Sector in Burkina Faso

Introduction: Low back pain is nowadays a real public health problem in companies. The objective of the study was to determine the prevalence and factors associated with chronic low back pain among workers of a mining company in Burkina Faso. Material and Methods: This was a descriptive and analytical cross-sectional study with a retrospective collection that took place from August 1, 2021 to March 16, 2022 in a gold mine in Burkina Faso. It focused on mine workers who participated in the 2019 annual medical visit. Results: Out of a total workforce of 880 workers who took part in the annual medical visit in 2019, 165 had chronic common low back pain, i.e. a prevalence of 18.75%. The average age of low back pain workers was 37.21 ± 7.5 years. Among the workers suffering from low back pain, 62 (37.58%) held the position of machine operator. Clinically, mechanical pain was found in 113 low back pain workers (76%) and twenty-nine (17.58%) had radicular pain. Standard radiography of the lumbar spine was abnormal in 129 workers (78.18%. In the univariate analysis, the factors associated with the pathology were sex, level of study, work station and seniority in the position. After a logistic regression, the factors associated with its occurrence were whole-body vibration (Fisher’s test = 12.7541;P = 0.000), male sex (Fisher’s test = 8.363;P = 0.004), and seniority for 4 to 5 years (Chi2 = 4.0234;p = 0.046). Conclusion: The study reveals the existence of chronic low back pain cases among the workers of the mining company. There is a predominance of the pathology in men, workers exposed to vibrations and those with a seniority of 4 to 5 years. It is necessary to establish a policy of prevention of low back pain for the benefit of workers, in particular those exposed to vibrations.

Omphalocele Diagnosis Problem in Rural Environment

Introduction: An omphalocele is a congenital malformation due to a failure of closure of the umbilical ring with exteriorization of the abdominal viscera covered by the translucent and avascular amniotic membrane. We report a case of giant omphalocele unrecognized at birth followed by a review of the literature. Observation: This was a 4-year-old girl admitted to the department for umbilical swelling that had been present since birth. Clinical and paraclinical examinations made it possible to objectivize a post-omphalocele hernia with hepatic content plus ectopic accession of the left ureter, the surgical procedure consisted of reintroducing the liver associated with a cure of the hernia + ureterovesical reimplantation. Conclusion: Omphalocele is a congenital malformation, antenatal diagnosis is possible during morphological ultrasound from the 12th week.

Cementoblastoma: An Exception to Confirm the Rule

Introduction: According to the 2017 WHO classification of head and neck tumors, osseous dysplasia is called cementoblastoma, predominantly occuring in melanoderm women. Its discovery is often in the fourth decade of life at the stage of radiopaque bone lesions. The treatment is surgical. Our aim was to report a singular case of cementoblastoma. Observation: The 54-year-old male patient came for a dental prosthetic rehabilitation. Based on the routine orthopantomogram (OPT) findings, the patient was subsequently referred to oral surgery. Dental lesions was suggestive of cementoblastoma. Abstention was recommended regarding the tumor which is still clinically silent subject to monitoring of the underlying tumor progression. There was no further contact with the patient. Discussion: The male sex does not fit into the classic epidemiological profile of this tumor which almost always affects women. The late discovery is due to silent development of the tumor and poor access to care. It is also explained by the lack of knowledge of tumor processes and the rarity of global X-ray explorations given the prior history of dental avulsions. Beyond prosthetic care, monitoring of the underlying tumor progression was dependent on the prevailing work conditions in which surgical intervention is systematic. Conclusion: Cementoblastoma is a possibility to consider for male patient.