adriano ribeiro - Academia.edu (original) (raw)
Papers by adriano ribeiro
![Research paper thumbnail of [Risk factors associated with coagulation abnormalities in Bothrops envenoming]](https://attachments.academia-assets.com/112854180/thumbnails/1.jpg)
](Revista da Sociedade Brasileira de Medicina Tropical, 2003
This study aimed at assessing, in the envenoming by Bothrops, factors that are associated with bl... more This study aimed at assessing, in the envenoming by Bothrops, factors that are associated with blood incoagulability. Information was obtained from the charts of 2,991 patients admitted to Instituto Butantan, from 1981 to 1990. Factors positively associated with blood incoagulability (p < 0.05) were: snake bite in the late months of the year; bites in the distal segments of the lower limbs; pain, edema, and bruising at the bite site; systemic bleeding and shock; dose of antivenom administered; time between bite and admission to Instituto Butantan. Size of the snake Bothrops jararaca; use of a tourniquet; and time between arrival to Instituto Butantan and start of the antivenom administration were negatively associated with blood incoagulability (p < 0.05). Factors not associated with blood incoagulability (p > 0.05) were: time of the bite; presence of recently swallowed prey in the snake gut; gender and age of the patient; blister, necrosis, and abscess at the bite site; oc...
Journal of NeuroEngineering and Rehabilitation, 2014
Background: Hand synergies have been extensively studied over the last few decades. Objectives of... more Background: Hand synergies have been extensively studied over the last few decades. Objectives of such research are numerous. In neuroscience, the aim is to improve the understanding of motor control and its ability to reduce the control dimensionality. In applied research fields like robotics the aim is to build biomimetic hand structures, or in prosthetics to design more performant underactuated replacement hands. Nevertheless, most of the synergy schemes identified to this day have been obtained from grasping experiments performed with one single (generally dominant) hand to objects placed in a given position and orientation in space. Aiming at identifying more generic synergies, we conducted similar experiments on postural synergy identification during bimanual manipulation of various objects in order to avoid the factors due to the extrinsic spatial position of the objects. Methods: Ten healthy naive subjects were asked to perform a selected "grasp-give-receive" task with both hands using 9 objects. Subjects were wearing Cyberglove © on both hands, allowing a measurement of the joint posture (15 degrees of freedom) of each hand. Postural synergies were then evaluated through Principal Component Analysis (PCA). Matches between the identified Principal Components and the human hand joints were analyzed thanks to the correlation matrix. Finally, statistical analysis was performed on the data in order to evaluate the effect of some specific variables on the hand synergies: object shape, hand side (i.e., laterality) and role (giving or receiving hand). Results: Results on PCs are consistent with previous literature showing that a few principal components might be sufficient to describe a large variety of different grasps. Nevertheless some simple and strong correlations between PCs and clearly identified sets of hand joints were obtained in this study. In addition, these groupings of DoF corresponds to well-defined anatomo-functional finger joints according to muscle groups. Moreover, despite our protocol encouraging symmetric grasping, some right-left side differences were observed. Conclusion: The set of identified synergies presented here should be more representative of hand synergies in general since they are based on both hands motion. Preliminary results, that should be deepened, also highlight the influence of hand dominance and side. Thanks to their strong correlation with anatomo-functional joints, these synergies could therefore be used to design underactuated robotics hands.
Toxicon, 1994
Forty patients with abscesses at the site of Bothrops bite were evaluated. Ten brought the snake ... more Forty patients with abscesses at the site of Bothrops bite were evaluated. Ten brought the snake responsible for the bite, Bothrops jararaca in all cases. On admission a sample was collected from each case for aerobic and anaerobic culture, and no abscesses drained ...
Revista da Sociedade Brasileira de Medicina Tropical, 2003
This study aimed at assessing, in the envenoming by Bothrops, factors that are associated with bl... more This study aimed at assessing, in the envenoming by Bothrops, factors that are associated with blood incoagulability. Information was obtained from the charts of 2,991 patients admitted to Instituto Butantan, from 1981 to 1990. Factors positively associated with blood incoagulability (p < 0.05) were: snake bite in the late months of the year; bites in the distal segments of the lower limbs; pain, edema, and bruising at the bite site; systemic bleeding and shock; dose of antivenom administered; time between bite and admission to Instituto Butantan. Size of the snake Bothrops jararaca; use of a tourniquet; and time between arrival to Instituto Butantan and start of the antivenom administration were negatively associated with blood incoagulability (p < 0.05). Factors not associated with blood incoagulability (p > 0.05) were: time of the bite; presence of recently swallowed prey in the snake gut; gender and age of the patient; blister, necrosis, and abscess at the bite site; oc...
Journal of NeuroEngineering and Rehabilitation, 2014
Background: Hand synergies have been extensively studied over the last few decades. Objectives of... more Background: Hand synergies have been extensively studied over the last few decades. Objectives of such research are numerous. In neuroscience, the aim is to improve the understanding of motor control and its ability to reduce the control dimensionality. In applied research fields like robotics the aim is to build biomimetic hand structures, or in prosthetics to design more performant underactuated replacement hands. Nevertheless, most of the synergy schemes identified to this day have been obtained from grasping experiments performed with one single (generally dominant) hand to objects placed in a given position and orientation in space. Aiming at identifying more generic synergies, we conducted similar experiments on postural synergy identification during bimanual manipulation of various objects in order to avoid the factors due to the extrinsic spatial position of the objects. Methods: Ten healthy naive subjects were asked to perform a selected "grasp-give-receive" task with both hands using 9 objects. Subjects were wearing Cyberglove © on both hands, allowing a measurement of the joint posture (15 degrees of freedom) of each hand. Postural synergies were then evaluated through Principal Component Analysis (PCA). Matches between the identified Principal Components and the human hand joints were analyzed thanks to the correlation matrix. Finally, statistical analysis was performed on the data in order to evaluate the effect of some specific variables on the hand synergies: object shape, hand side (i.e., laterality) and role (giving or receiving hand). Results: Results on PCs are consistent with previous literature showing that a few principal components might be sufficient to describe a large variety of different grasps. Nevertheless some simple and strong correlations between PCs and clearly identified sets of hand joints were obtained in this study. In addition, these groupings of DoF corresponds to well-defined anatomo-functional finger joints according to muscle groups. Moreover, despite our protocol encouraging symmetric grasping, some right-left side differences were observed. Conclusion: The set of identified synergies presented here should be more representative of hand synergies in general since they are based on both hands motion. Preliminary results, that should be deepened, also highlight the influence of hand dominance and side. Thanks to their strong correlation with anatomo-functional joints, these synergies could therefore be used to design underactuated robotics hands.
Toxicon, 1994
Forty patients with abscesses at the site of Bothrops bite were evaluated. Ten brought the snake ... more Forty patients with abscesses at the site of Bothrops bite were evaluated. Ten brought the snake responsible for the bite, Bothrops jararaca in all cases. On admission a sample was collected from each case for aerobic and anaerobic culture, and no abscesses drained ...