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Rehabilitación de la heminegligencia visuo-espacial en pacientes que han sufrido un ictus hemisférico derecho. Investigación de estrategias combinadas para. Request PDF on ResearchGate | On Feb 1, , A. García-Molina and others published Heminegligencia espacial secundaria a traumatismo. PDF | This series of articles for rehabilitation in practice aims to cover a knowledge Heminegligencia visuo-espacial: aspectos clínicos, teóricos y tratamiento.

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Heminegligencia Espacial Pdf

Novo sinal clínico provavelmente associado a hemiplegia esquerda com heminegligência espacial esquerda: as pernas cruzadas. Rodrigo. espacial. Antecedentes: la negligencia visuo-espacial predice or Palabras clave: atención, ictus, heminegligencia, neuropsicología, rehabilitación. Heminegligencia Espacial. Heminegligencia Personal. Síndrome de Balint. Simultagnosia. Trastorno por Déficit de Atención con Hiperactividad.

Full Text Dear Editor: Hemispatial neglect is characterised by systematic omission of stimuli in the contralesional hemifield. This disorder affects such daily activities as getting dressed, eating, reading, or writing. Patients display a decreased ability to attend to, explore, and respond to novel or significant stimuli on the side opposite to the injury. This impairment cannot be attributed to presence of homonymous hemianopsia, which sometimes coexists with hemispatial neglect. Our patient is a year-old right-handed man with no relevant medical history who experienced severe head trauma after falling in a suicide attempt. When the emergency medical services arrived on the scene, the patient had a Glasgow Coma Scale score of 6, a bleeding scalp wound, and numerous associated contusions. Brain CT performed when he was admitted to the emergency department displayed a comminuted fracture of the right parietal bone; the largest fragment was depressed. Subdural haematoma was identified in the right hemisphere, with a subarachnoid haemorrhage and the haemorrhagic contusion site in the parietal lobe.

Today it is a large scale operation mining , tpd of mainly sulphide ore. The present mine plan is for open pit operations to cease in year at a depth of m. Although the orebody continues below the bottom of the final pit shell, the cost increments associated with a deep pit operation do not allow for further open pit mining, therefore it become necessary to initiate a transition from open pit to underground mining.

Geotechnical challenges of the transition from open pit to underground mining at Chuquicamata Mine

The underground operation will be implemented at depth, in a hard and massive rock mass and in high stress environments. To make this project economically viable requires application of a large scale and low cost underground mass mining method in order to achieve the required high production rates. The only methods that can achieve these requirements are block and panel caving. The transition from a large scale and deep open pit to underground cave mining at Chuquicamata will face with several geotechnical challenges.

These include the presence of the large and deep open pit which will produce zones of stress concentrations and zones of low confinement, the magnitude of induced stresses due to the pit depth, cave propagation, simultaneous open pit and underground operations, the presence of the West fault and the shear zone, subsidence and water inflows.

This mine is part of Codelco Norte Division which has three open pit operations with Chuquicamata Chuquicamata mine lies at approximately 3, m being the biggest, as shown in Figure 2.

Currently, elevation in the Atacama Desert of northern Chile, some 16 Chuquicamata is one of the largest open pit mines in the km from Calama city, in the Province of El Loa, and some world, as shown in Figure 3, with a strike length of 4.

This mine started in and currently mines 88 Fortuna granodiorite Granodiorites Mt of ore and Mt of waste. The current mine plan is to reach a depth of 1, m in year Although the ore Moderately sheared zone Waste body continues below of the final pit bottom the open pit, the Highly sheared zone operational cost at that depth will not allow for continued mining by the open pit method.

Therefore, it has become necessary to initiate a transition from open pit to underground mining. This transition phase will require suc- West fault cessfully overcoming a number of technical and economic issues Arancibia and Flores It should be East porphyry with potassic alteration evident, therefore, that the decision on transition from open pit to underground mining should take into account the number of geotechnical factors which control the rock mass Table 1: Geotechnical Units response during this phase.

Unit MPa fract. The mineralization was controlled by the West Fault which is located at the toe of the West wall. From the fault to the The stress field at Chuquicamata has been measured West is waste and from the fault to the East is ore, as using a hydro-fracturing technique in deep vertical down illustrated in Figure 4. The in situ stress field is defined by a vertical stress About 2, Mt of ore, averaging 1.

The hori- Mt will be mined out from to final pit.

KMIN ranges from resources estimated to be 1, Mt at an average grade of 0. These values will be verified using the CSIRO hollow At the Chuquicamata mine the predominant rock types inclusion technique to perform stress measurements from are granodiorites and porphyries, whose western contact is the exploration tunnels which will be available below the defined by the West fault, a large regional fault with a NS final open pit shell at the end of the year In the upper part of these There are many near surface deposits that have slopes the rock is Fortuna granodiorite.

On the eastern side considerable vertical extent. Although they are initially of the West fault appears a massive quartz-sericitic rock, exploited by open pit mining, there is often a point where and beyond that porphyries with different types of alteration. At Chuquicamata are: pre-sent several open pit mines are planning, or are in the The engineering geology at Chuquicamata is such that process of implementing, a transition to underground twelve geotechnical units have been defined Torres et al mining.

The main geotechnical units in the The decision to make the transition from open pit to an sector of interest to the transition project have the underground operation is often based on a simple characteristics summarized in Table 1 Flores et al c.

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Underground mining is only contemplated when a further pushback is shown to be uneconomic. However, any decision to go underground also requires consideration of a wide range of technical factors, and careful planning, which means a significant amount of time for achieving underground mining up to 20 years has been suggested by Stacey and Ter-brugge This is in addition to the thorough assessment of the risks associated with the rock mass failure that accompanies underground cave mining, and its interaction with the open pit and the surrounding infrastructure.

Perhaps one of the most important decisions, in the initial stages of a project for a transition from open pit to underground mining, is the definition of the most suitable underground mining method based on the characteristics of the deposit and, at the same time, the economic and business re-quirements of the mining company. If the busi- ness requires high production rates and low op-erational costs, then underground cave mining methods, such as block or panel caving, are the only methods through which these main objec-tives can be achieved.

In such cases, it is desir-able that the open pit continues its operation during the first stages of underground mining, and that the underground mine gets to a high productivity quickly and Figure 7: Section N illustrating the geotechnical units before closure of the open pit operation.

This means that and the major structures Torres et al there will be a period of simultaneous open pit and under- ground mining operations. We were unable to perform UNS tests on one patient with crossed legs because his rapid deterioration.

Geotechnical challenges of the transition from open pit to underground mining at Chuquicamata Mine

Written informed consent was given by a close relative or a legal guardian. RESULTS Nine patients with right cerebral vascular lesions, left hemiplegia and persistent tendency to cross the right leg over the left were found. All of them had not suffered any prior stroke and had been leading a normal life up to admission.

The consciousness level varied among them. All 9 presented with the right leg crossed over the left, even in coma Figures 1 and 2 , with patients and their CT scans. This clinical sign was present for the majority of the time between admission and discharge. All presented frequent rubbing movements of the right leg over the left in the first 48 to 72 hours of clinical evolution. Eight presented left-hand side UNS during the recovery phase. UNS tests were not performed in one patient due to rapid deterioration.

This impairment cannot be attributed to presence of homonymous hemianopsia, which sometimes coexists with hemispatial neglect. Our patient is a year-old right-handed man with no relevant medical history who experienced severe head trauma after falling in a suicide attempt.

When the emergency medical services arrived on the scene, the patient had a Glasgow Coma Scale score of 6, a bleeding scalp wound, and numerous associated contusions. Brain CT performed when he was admitted to the emergency department displayed a comminuted fracture of the right parietal bone; the largest fragment was depressed.

Subdural haematoma was identified in the right hemisphere, with a subarachnoid haemorrhage and the haemorrhagic contusion site in the parietal lobe.

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We found no midline shift, and the ventricular system was symmetrical and of normal size. Bone fragments were excised and the parenchyma of the right cerebral convexity was resected. A subsequent brain MRI Fig. Figure 1. One month after the traumatic injury, the patient was transferred to our hospital to undergo neurorehabilitation.