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Sökning: WFRF:(Andreasson Håkan)

  • Resultat 21-30 av 85
  • Föregående 12[3]4567...9Nästa
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21.
  • Andréasson, Håkan, et al. (författare)
  • Cytoreductive surgery in pseudomyxoma peritonei-aspects of the learning curve
  • 2013
  • Ingår i: European Journal of Surgical Oncology. - 0748-7983 .- 1532-2157. ; 40:8, s. 930-936
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Cytoreductive surgery (CRS) plus perioperative intraperitoneal chemotherapy is a highly invasive treatment of peritoneal metastasis and requires many surgical procedures before mastering. The aim of this study was to estimate how many procedures are needed before stabilization can be seen in surgical outcome (R1 surgery, adverse events and bleeding) in patients with pseudomyxoma peritonei (PMP). Patients and methods: All 128 patients with PMP who were treated with CRS alone or CRS plus perioperative intraperitoneal chemotherapy between 2003 and 2008 at the Uppsala University Hospital, Uppsala, Sweden, were included. The learning curve was calculated using the partial least square (PLS) and cumulative sum control chart (CUSUM) graph. Two groups were formed based on the results of the learning curve. The learning curve plateau was considered the same as the stabilization in the CUSUM graph. Group I consisted of patients included during the learning period (n = 73) and Group 11 of patients treated after the learning period ended (n = 55). Comparisons between the groups were made on surgical outcome, survival and adverse events. Results: Stabilization was seen after 220 +/- 10 procedures. A higher occurrence of R1 surgery was seen in Group H (80%) compared to Group I (48%; P = 0.0002). Overall survival increased at four years after surgery in Group H compared to Group I (80% vs. 63%; P = 0.02). Conclusion: CRS plus perioperative intraperitoneal chemotherapy is a highly demanding procedure that requires more than 200 procedures before optimisation in surgical outcome is seen.
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22.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Existence of axially symmetric static solutions of the Einstein-Vlasov system
  • 2011
  • Ingår i: Commun. Math. Phys.. - 0010-3616. ; 308, s. 23-47
  • Tidskriftsartikel (refereegranskat)abstract
    • We prove the existence of static, asymptotically flat non-vacuum spacetimes with axial symmetry where the matter is modeled as a collisionless gas. The axially symmetric solutions of the resulting Einstein-Vlasov system are obtained via the implicit function theorem by perturbing off a suitable spherically symmetric steady state of the Vlasov-Poisson system.
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23.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Existence of axially symmetric static solutions of the Einstein-Vlasov system
  • 2011
  • Ingår i: Communications in Mathematical Physics. - 1432-0916 .- 0010-3616. ; 308:1, s. 23-47
  • Tidskriftsartikel (refereegranskat)abstract
    • We prove the existence of static, asymptotically flat non-vacuum spacetimes with axial symmetry where the matter is modeled as a collisionless gas. The axially symmetric solutions of the resulting Einstein-Vlasov system are obtained via the implicit function theorem by perturbing off a suitable spherically symmetric steady state of the Vlasov-Poisson system.
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25.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Formation of trapped surfaces for the spherically symmetric Einstein-Vlasov system
  • 2010
  • Rapport (övrigt vetenskapligt)abstract
    • We consider the spherically symmetric, asymptotically flat, nonvacuum Einstein equations, using as matter model a collisionless gas as described by the Vlasov equation. We find explicit conditions on the initial data which guarantee the formation of a trapped surface in the evolution which in particular implies that weak cosmic censorship holds for these data. We also analyze the evolution of solutions after a trapped surface has formed and we show that the event horizon is future complete. Furthermore we find that the apparent horizon andthe event horizon do not coincide. This behavior is analogous to what is found in certain Vaidya spacetimes. The analysis is carried out in Eddington-Finkelstein coordinates.
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26.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Formation of trapped surfaces for the spherically symmetric Einstein-Vlasov system
  • 2010
  • Ingår i: Journal of Hyperbolic Differential Equations. - 0219-8916. ; 7:4, s. 707-731
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider the spherically symmetric, asymptotically flat, non-vacuum Einstein equations, using as matter model a collisionless gas as described by the Vlasov equation. We find explicit conditions on the initial data which guarantee the formation of a trapped surface in the evolution which in particular implies that weak cosmic censorship holds for these data. We also analyze the evolution of solutions after a trapped surface has formed and we show that the event horizon is future complete. Furthermore we find that the apparent horizon and the event horizon do not coincide. This behavior is analogous to what is found in certain Vaidya spacetimes. The analysis is carried out in Eddington-Finkelstein coordinates.
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29.
  • Andreasson, Håkan, 1966-, et al. (författare)
  • Global existence for the spherically symmetric Einstein-Vlasov system with outgoing matter
  • 2008
  • Ingår i: Communications in Partial Differential Equations. - 0360-5302 .- 1532-4133. ; 33:4, s. 656-668
  • Tidskriftsartikel (refereegranskat)abstract
    • We prove a new global existence result for the asymptotically flat, spherically symmetric Einstein-Vlasov system which describes in the framework of general relativity an ensemble of particles which interact by gravity. The data are such that initially all the particles are moving radially outward and that this property can be bootstrapped. The resulting non-vacuum spacetime is future geodesically complete.
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  • Resultat 21-30 av 85
  • Föregående 12[3]4567...9Nästa
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