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Search Results: 1 - 10 of 19810 matches for " André Tokpa "
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Anterior Cervical Spine Osteosynthesis Complicated by Pharyngoesophageal Perforation  [PDF]
André Tokpa, Louis Derou, Ml Konan, Guy Varlet, Dominique N’dri-Oka
Open Journal of Modern Neurosurgery (OJMN) , 2018, DOI: 10.4236/ojmn.2018.84034
Abstract: Anterior cervical spine surgery for traumatic or degenerative disease is a well-established procedure. However, complications such as pharyngoesophageal perforation can occur. In this study, we report a series of 6 pharyngoesophageal perforations after surgery. Based on the literature review, we analyzed pathogenesis, diagnosis and discussed therapeutic strategies. Three cases occurred after surgeries of traumatic cervical spine whereas the remaining were after surgeries for degenerative cervical myelopathy. The mean duration of surgery was 210 minutes. The symptoms, appearing 48 hours after surgery, were commonly hyperthermia, dysphagia, sore throat and swelling of the incision site. The diagnostic was confirmed after contrast-enhanced esophagography. The treatment strategies consisted of insertion of nasogastric feeding tube, oral intake restriction, intravenous antibiotics administration, wound drainage. Reoperation was necessary in 4 cases with removal of the hardware in three of them. One death occurred by pulmonary embolism in a tetraplegic patient. The occurrence of pharyngoesophageal perforation after cervical spine surgery can be disastrous. It can be avoided by increasing surgeon awareness during the surgical procedure. Early detection, immediate and multidisciplinary therapy are recommended to achieve the best outcomes.
A Rare Case of a Thoracic Spinal Hemangiopericytoma  [PDF]
Derou Keableon Louis, Irié Bi Gohi Serge, Tokpa André, Konan Serge Yao, Bougaci Nassim, Lonjon Michel
Open Journal of Modern Neurosurgery (OJMN) , 2019, DOI: 10.4236/ojmn.2019.91001
Abstract: Spinal hemangiopericytomas are rare tumors. To date, only 80 cases of spinal hemangiopericytomas have been reported in the literature. The postoperative evolution of this condition in rare cases can be complicated by a symptomatic compressive epidural hematoma that can be the source of serious neurological complications requiring emergency surgery. We report a rare case of intradural and extramedullary spinal hemangiopericytomas with favorable evolution after treatment in an 82 years old woman.
A Retrospective Study to Determine the Prevalence and Outcome of Tuberculosis among Patients Who Visited the TB Annex Hospital in Congo Town, Monrovia, Liberia from July 2009 to July 2010
Patrick N. Kpanyen,Gorgui Diouf,Augustine F. Tokpa,Moses W. Toe
Global Journal of Health Science , 2011, DOI: 10.5539/gjhs.v3n1p110
Abstract: This study was conducted at the TB Annex Hospital in Monrovia; the capital city for Liberia. The Annex is the only public health center build currently to treat TB and its related complications. The major aim of this paper was to determine the rate of sputum positive cases among those who visited the TB Annex Hospital from July 2009 to July 2010 and factors (age, gender, education, time and season) associated with this probability. Additionally, it was meant to find the rate of treatment compliance and various factors also associated with its probability. A cross-sectional descriptive study design was used and all the 299 patients who visited the Center to seek health care’s hospital charts were thoroughly reviewed. Results showed in Figure 1 that the prevalence of TB was very high among those who visited the TB Annex Hospital. The Exact Binomial Test was used with p<0.05 and CI (0.864 – 0.934).Accordingly, the monthly incidence of the disease remains very high ranging from 75% to 100% respectively. Amazingly, in January 2010 alone, all 42 patients who visited the Annex were sputum positive. During the period under study according to Table 1 and looking at the sputum screening test by age distribution as a variable, the various age range were set at 0-6,7-12,13-18,19-24, 25-30and 31years and above respectively. Accordingly, the latter recorded the highest number of patients 126 out of 299 yet with p>0.05.Out of the 299 patients, 172 was males with 127 females. For their educational level, its corresponding p is < 0.05 indicating that the disease was distributed based on their level of education. The dry season recorded 133 patients out of which 124 were sputum positive cases. According to Table 2, age group 31 and above completed their TB treatment(66.09%) and the rest closely dispersed but p>0.05. For gender, the females did extremely well (80.18%) in complying with treatment than their male counterparts p<0.05. There was no difference seen with regards to the distribution of the disease by season as a factor.
Hydrothermal Alterations in Irbiben Gold Deposit (Tagragra Akka, Western Anti-Atlas, Morocco): Petrographic and Geochemical Characterization  [PDF]
Tokpa Kakeu Lionel-Dimitri Boya, N’Guessan Nestor Houssou, Marc Ephrem Allialy, Allou Gnanzou, Lamia Erraioui, Benyounes Maamar, Souad M. Rabet
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.511005
Abstract: Irbiben is a small gold deposit of the Precambrian inlier Tagragra d’Akka located in the Moroccan western Anti-Atlas, approximately 160 km southeast from Tiznit. Petrographic study shows that host rocks of Irbiben deposit are green schist facies metamorphic rocks, like metamorphic sandstone and schist, meta-pelite and quartzite. Gold is located in quartz veins or host rock with frequent injections of quartz. The petrographic characterization of alteration through the description of the alteration profiles and the comparative study of protolith and altered rocks showed a development of dominant quartz and calcite in mineralization wall-rocks. In moving away from it, there is rather sericite and chlorite. These phenomena are materialized respectively by the development of SiO2 and CaO in the wall-rocks but rather that ferromagnesian elements (FeO, MgO) and K2O away from the mineralization. These trends were demonstrated by the geochemical study through Harker diagrams, description of alteration profiles, comparative study of protolith and altered rocks, and use of a new alteration index, MIA, elaborated during this work.
Post-Formal Thought in Gerontagogy or Beyond Piaget  [PDF]
André Lemieux
Journal of Behavioral and Brain Science (JBBS) , 2012, DOI: 10.4236/jbbs.2012.23046
Abstract: Jean Piaget, one of the most influential theorists in developmental psychology, assumed that formal thought, characterized by the development of an individual’s logical capacities, was the last stage of adult thinking. In this article, we review how the brain evolved, describing its main structures, and examining each cerebral hemisphere’s specific functions. Evidence is also provided for the production of new neurons and new connections between them, forcing a revision of old theories about the decline of intellectual functions in the elderly. We then consider Jones’ theories X and Y, and the different definitions of intelligence (fluid vs. crystallized, and qualitative vs. quantitative), and how these perspectives have influenced the way we see intelligence. Evidence supporting the addition of another stage, named post-formal thought, is examined in the context of gerontagogy. Dialectical thought characterizes this stage, and developing wisdom is its main goal. We examine the two basic principles of dialectical thought, namely the principle of contradiction and the principle of relativity of everything. It is suggested that the learning of wisdom should be the focus of future university programs to educate the elderly.
The History of the Basal Ganglia: The Contribution of Karl Friedrich Burdach  [PDF]
André Parent
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.34046

It took many centuries for the basal ganglia (BG) to be recognized as specific brain entities involved in the control of psychomotor behavior. Andreas Vesalius (1514-1564) was the first to delineate this set of structures, but he did not name them nor payany attention to their functional significance. This was left to the English physician Thomas Willis (1621-1675), who used the term corpus striatum (striated or chamfered body) to designate the largest BG constituent, which he considered a major sensorimotor integration center. Willis’s pioneering description influenced markedly some 18th and 19th centuries scholars, particularly the German physician and anatomist Karl Friedrich Burdach (1776-1847). Burdach’s insightful studies of the human brain are summarized in a three-volume treatise entitled Vom Baue und Leben des Gehirns (1819-1826). This landmark opus provides a description of the BGwhose originality has largely been overlooked. Burdach’s careful investigation allowed him to differentiate the caudate nucleus from the putamen, which he respectively termed Streifenhügel (elongated hillock) and Schale (shell). He also called the putamen Linsenkern (lens-shaped nucleus), a term that he admittedly borrowed from his compatriot Johann Christian Reil (1759-1813). He further identified a paler structure (blasser Klumpen) within the inner portion of the lentiform nucleus that he called globus pallidus, and correctly identified its inner and outer segments (innern und ?ussern Theil). He aptly pointed out that the major BG nuclei are separated from one another by fibers fascicles that he termed inner and ?ussre Capsel (internal and external capsules). Burdach also referred to the substantia nigra (schwarzgraue Schicht or stratum nigrum) and claustrum (Vormauer), but gave full credit to the French anatomist Félix Vicq-d’Azyr (1748-1794) for their discovery. Although Burdach did not comment much on BG function, his anatomical description was sufficiently cogent to be still in use two centuries after its inception.

Louis Pierre Gratiolet (1815-1865) and His Contribution to the Study of Cerebral Convolutions in Primates  [PDF]
André Parent
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51001

Louis Pierre Gratiolet (1815-1865) was one of the first modern anatomists to pay attention to cerebral convolutions. Born in Sainte-Foy-la-Grande (Gironde), he moved to Paris in 1834 to study medicine, as well as comparative anatomy under Henri de Blainville (1777-1850). In 1842, he accepted de Blainville’s offer to become his assistant at the Muséum dhistoire naturelle and progressively abandoned medicine for comparative anatomy. He undertook a detailed study of brains of human and nonhuman primates and soon realized that the organizational pattern of cerebral convolutions was so predictable that it could serve as a criterion to classify primate groups. He noted that only the deepest sulci exist in lower primate forms, while the complexity of cortical folding increases markedly in great apes and humans. Gratiolet provided the first cogent description of the lobular organization of primate cerebral hemispheres. He saw the insula as a central lobe around which revolved the frontal, parietal, temporal (temporo-sphenoidal) and occipital lobes. He correctly identified most gyri and sulci on all brain surfaces, introduced the term plis de passage for some interconnecting gyri, and provided the first description of the optic radiations. In the early 1860s, Gratiolet fought a highly publicized battle against Paul Broca (1824-1880) on the relationship between brain and intelligence. Gratiolet agreed that the brain was most likely the seat of intelligence, but he considered human cognition far too subtle to have any direct relationship with

Procedural Utility in the Work Place, Evidence from Mexico  [PDF]
André Vargas
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.49104
Abstract: The concept of Utility usually refers to the satisfaction a person acquires by consuming, in general under circumstances bonded to income, and the price of goods. In a psychological vision of personal well-being, happiness and its components, consider the fact that people can value anything. This notion has led to the study of Procedural Utility, that means people not only value the outcome of something, but also values the process and conditions in which the outcome is achieved. Procedural Utility can be obtained from various economic procedures in which individuals are part of, e.g. Work and consumption among others. Evidence has been found that in the work place the fact of being attached to hierarchy generates negative Procedural Utility because it disrupts psychological precepts that determine happiness, well-being, or utility [1]. In other cases it has been found that the process on how a wage cut is done must be considered [2]. In the light of this phenomena, I’ll discuss the concept of Procedural Utility and analyze empirical evidence for the Mexican case with “Instituto Nacional de Estadistica y Geografía” INEGI’s self-reported well-being survey (BIARE), with the finality to give suggestions on possible applications of processes to improve the worker’s satisfaction.
The Hydrogen Atom Fundamental Resonance States  [PDF]
André Michaud
Journal of Modern Physics (JMP) , 2018, DOI: 10.4236/jmp.2018.95067
Abstract: In the 1920’s, Louis de Broglie’s observation that the integer sequence that could be related to the interference patterns produced by the various electromagnetic energy quanta emitted by hydrogen atoms was identical to those of very well known classical resonance processes, made him conclude that electrons were captive in resonance states within atoms. This led Schr?dinger to propose a wave function to represent these resonance states that still have not been reconciled with the electromagnetic properties of electrons. This article is meant to identify and discuss the electromagnetic harmonic oscillation properties that the electron must possess as a resonator in order to explain the resonance volume described by the wave function, as well as the electromagnetic interactions between the elementary charged particles making up atomic structures that could explain electronic and nucleonic orbitals stability. An unexpected benefit of the expanded space geometry required to establish these properties and interactions is that the fundamental symmetry requirement is respected by structure for all aspects of the distribution of energy within electromagnetic quanta.
The Mechanics of Conceptual Thinking  [PDF]
André Michaud
Creative Education (CE) , 2019, DOI: 10.4236/ce.2019.102028
Abstract: Description of the mechanics of conceptual thinking?that?stems?from interaction sequences between the limbic system and the verbal areas of the neocortex. Description of the rise of the attention level to full active awareness when a feeling of uneasiness due to a verbal stimulus is triggered by the amygdala, followed by an active cogitation process involving the verbal areas of the neocortex, ending in the strengthening in the neocortex by the hippocampus of a synaptic network corresponding to a modified verbal sequence that removes or reduces the feeling of uneasiness that initiated the sequence. Description of the generalization abilitythat?emerges from the use of articulated languages, acquired by education, from which conceptual thinking andalso?the collectively intelligible mathematical language emerge that also develops to various degrees in some individuals by education. Description of the mathematical thinking mode, about?whose engrams have been located in the neocortex in areas that do not overlap the verbal areas.
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