RESUMO
The mechanical properties of the cerebral bridging veins (CBVs) were studied using advanced microtensile equipment. Detailed high-quality curves were obtained at different strain rates, showing a clearly nonlinear stress-strain response. In addition, the tissue of the CBVs exhibits stress relaxation and a preconditioning effect under cyclic loading, unequivocal indications of viscoelastic behavior. Interestingly, most previous literature that conducts uniaxial tensile tests had not found significant viscoelastic effects in CBVs, but the use of more sensitive tests allowed to observe the viscoelastic effects. For that reason, a careful mathematical analysis is presented, clarifying why in uniaxial tests with moderate strain rates, it is difficult to observe any viscoelastic effect. The analysis provides a theoretical explanation as to why many recent studies that investigated mechanical properties did not find a significant viscoelastic effect, even though in other circumstances, the CBV tissue would clearly exhibit viscoelastic behavior. Finally, this study provides reference values for the usual mechanical properties, as well as calculations of constitutive parameters for nonlinear elastic and viscoelastic models that would allow more accurate numerical simulation of CBVs in Finite Element-based computational models in future works.
RESUMO
Los principales problemas fueron la numeración en el levantamiento de cadáver-zona de registro, la coordinación médico forense-policial y en la zona del control de calidad. A pesar del buen resultado se evidenció la necesidad de formación especializada; realizar simulacros parecidos multidisciplinares y de adecuación de la normativa a las instalaciones propias. Ante un suceso con víctimas múltiples debemos adaptarnos a la legislación vigente (Real Decreto 32/2009: protocolo nacional de actuación médico-forense y de Policía Científica en sucesos con víctimas múltiples). El objetivo principal de nuestro estudio fue valorar la respuesta médico-forense mediante un simulacro con atentado bomba, con 11 individuos fallecidos siguiendo la mencionada legislación. En el levantamiento había 8 cuerpos y 22 restos. La duración programada fue de 5h. En este tiempo estaban muy avanzadas las identificaciones de 8 personas (5 mediante estudio necrodactilar, odontología y ADN y 3 mediante estudio necrodactilar y ADN)(AU)
When a disaster involving multiple victims occurs we must comply with the legal norms in force in Spain (Royal Decree 32/2009, enacting the National Protocol for the Intervention of Forensic Doctors and Scientific Police in Mass Disaster). The main aim of our study was to assess the response of Forensic Doctors through a practice simulating a bomb attack with 11 mortal victims. At the disaster scene there were 8 bodies and 22 corpse remains to be identified. The expected duration was 5 hours. In that time the identification of 8 persons was well under way (5 using fingerprint identification, odontology and DNA, and 3 using fingerprint identification and DNA). The numbering of the bodies at the specific area of the disaster scene, the coordination of Forensic Doctors and Scientific Police and the management of the quality control area were the main problems. Despite of the good results achieved, the need for specialised training of the professionals participating in this type of intervention, the need to conduct similar multidisciplinary exercises, and the adaptation of the protocol to the specific guidelines of the Catalan Institute of Legal Medicine was evident(AU)
