Jose Pacheco - Academia.edu (original) (raw)

Papers by Jose Pacheco

Revista De La Universidad De Mexico, Sep 1, 1962

Western Journal of Emergency Medicine, 2015

Introduction: Penetrating injury to the forearm may cause an isolated radial or ulnar artery inju... more Introduction: Penetrating injury to the forearm may cause an isolated radial or ulnar artery injury, or a complex injury involving other structures including veins, tendons and nerves. The management of forearm laceration with arterial injury involves both operative and nonoperative strategies. An evolution in management has emerged especially at urban trauma centers, where the multidisciplinary resource of trauma and hand subspecialties may invoke controversy pertaining to the optimal management of such injuries. The objective of this review was to provide an evidence-based, systematic, operative and nonoperative approach to the management of isolated and complex forearm lacerations. A comprehensive search of MedLine, Cochrane Library, Embase and the National Guideline Clearinghouse did not yield evidence-based management guidelines for forearm arterial laceration injury. No professional or societal consensus guidelines or best practice guidelines exist to our knowledge. Discussion: The optimal methods for achieving hemostasis are by a combination approach utilizing direct digital pressure, temporary tourniquet pressure, compressive dressings followed by wound closure. While surgical hemostasis may provide an expedited route for control of hemorrhage, this aggressive approach is often not needed (with a few exceptions) to achieve hemostasis for most forearm lacerations. Conservative methods mentioned above will attain the same result. Further, routine emergent or urgent operative exploration of forearm laceration injuries are not warranted and not cost-beneficial. It has been widely accepted with ample evidence in the literature that neither injury to forearm artery, nerve or tendon requires immediate surgical repair. Attention should be directed instead to control of bleeding, and perform a complete physical examination of the hand to document the presence or absence of other associated injuries. Critical ischemia will require expeditious surgical restoration of arterial perfusion. In a well-perfused hand, however, the presence of one intact artery is adequate to sustain viability without long-term functional disability, provided the palmar arch circulation is intact. Early consultation with a hand specialist should be pursued, and follow-up arrangement made for delayed primary repair in cases of complex injury. Conclusion: Management in accordance with well-established clinical principles will maximize treatment efficacy and functional outcome while minimizing the cost of medical care.

n and Ag n clusters (n = 2 thru 12). Transition-metal clusters can be useful for the study of qua... more n and Ag n clusters (n = 2 thru 12). Transition-metal clusters can be useful for the study of quantum size effects and for formation of metallic states, and are ideal candidates for catalytic processes. Hybrid ab initio methods of quantum chemistry (particularly the DFT-B3LYP model) are used to derive optimal geometries for the clusters of interest. We compare calculated binding energies, bond-lengths, ionization potentials, electron affinities and HOMO-LUMO gaps for the clusters of the two different metals. Of particular interest are the comparisons of binding strengths at the three important types of sites: edge (E) sites, hollow sites (H) site and on-top (T) sites. Effects of crystal symmetries corresponding to the bulk structures for the two metals will also be investigated. The implications for the molecular dissociation of the H 2 and O 2 species will be considered.

Lime and Other Alternative Cements, 1992

Zeitschrift f�r Physik D Atoms, Molecules and Clusters, 1995

The microscopic structure of the photo-excited plasmon excitation in C60 and C70 is investigated ... more The microscopic structure of the photo-excited plasmon excitation in C60 and C70 is investigated using linear response theory. One finds that Landau damping provides the main contribution to the lineshape and the linewidth of the Mie-type plasmon being able, in the case of C70, to mask the deformation splitting effect associated with the low equilibrium symmetry (D5h) of this fullerene.

European Journal of Teacher Education, 2003

Revista De La Universidad De Mexico, Sep 1, 1962

Western Journal of Emergency Medicine, 2015

Introduction: Penetrating injury to the forearm may cause an isolated radial or ulnar artery inju... more Introduction: Penetrating injury to the forearm may cause an isolated radial or ulnar artery injury, or a complex injury involving other structures including veins, tendons and nerves. The management of forearm laceration with arterial injury involves both operative and nonoperative strategies. An evolution in management has emerged especially at urban trauma centers, where the multidisciplinary resource of trauma and hand subspecialties may invoke controversy pertaining to the optimal management of such injuries. The objective of this review was to provide an evidence-based, systematic, operative and nonoperative approach to the management of isolated and complex forearm lacerations. A comprehensive search of MedLine, Cochrane Library, Embase and the National Guideline Clearinghouse did not yield evidence-based management guidelines for forearm arterial laceration injury. No professional or societal consensus guidelines or best practice guidelines exist to our knowledge. Discussion: The optimal methods for achieving hemostasis are by a combination approach utilizing direct digital pressure, temporary tourniquet pressure, compressive dressings followed by wound closure. While surgical hemostasis may provide an expedited route for control of hemorrhage, this aggressive approach is often not needed (with a few exceptions) to achieve hemostasis for most forearm lacerations. Conservative methods mentioned above will attain the same result. Further, routine emergent or urgent operative exploration of forearm laceration injuries are not warranted and not cost-beneficial. It has been widely accepted with ample evidence in the literature that neither injury to forearm artery, nerve or tendon requires immediate surgical repair. Attention should be directed instead to control of bleeding, and perform a complete physical examination of the hand to document the presence or absence of other associated injuries. Critical ischemia will require expeditious surgical restoration of arterial perfusion. In a well-perfused hand, however, the presence of one intact artery is adequate to sustain viability without long-term functional disability, provided the palmar arch circulation is intact. Early consultation with a hand specialist should be pursued, and follow-up arrangement made for delayed primary repair in cases of complex injury. Conclusion: Management in accordance with well-established clinical principles will maximize treatment efficacy and functional outcome while minimizing the cost of medical care.

n and Ag n clusters (n = 2 thru 12). Transition-metal clusters can be useful for the study of qua... more n and Ag n clusters (n = 2 thru 12). Transition-metal clusters can be useful for the study of quantum size effects and for formation of metallic states, and are ideal candidates for catalytic processes. Hybrid ab initio methods of quantum chemistry (particularly the DFT-B3LYP model) are used to derive optimal geometries for the clusters of interest. We compare calculated binding energies, bond-lengths, ionization potentials, electron affinities and HOMO-LUMO gaps for the clusters of the two different metals. Of particular interest are the comparisons of binding strengths at the three important types of sites: edge (E) sites, hollow sites (H) site and on-top (T) sites. Effects of crystal symmetries corresponding to the bulk structures for the two metals will also be investigated. The implications for the molecular dissociation of the H 2 and O 2 species will be considered.

Lime and Other Alternative Cements, 1992

Zeitschrift f�r Physik D Atoms, Molecules and Clusters, 1995

The microscopic structure of the photo-excited plasmon excitation in C60 and C70 is investigated ... more The microscopic structure of the photo-excited plasmon excitation in C60 and C70 is investigated using linear response theory. One finds that Landau damping provides the main contribution to the lineshape and the linewidth of the Mie-type plasmon being able, in the case of C70, to mask the deformation splitting effect associated with the low equilibrium symmetry (D5h) of this fullerene.

European Journal of Teacher Education, 2003