Laceration injury to the superior vena cava (SVC) remains most feared complication of transvenous lead extraction (TLE). Early recognition is crucial prevent catastrophic complications. Use real time video assisted thoracoscopic surgery (VATS) during high risk TLE can potentially be useful for prompt SVC injury. We describe use thorascopic guidance complex extractions conducted a retrospective ...

In this article we study the evolution of dispersal in a structured metapopulation model. The metapopulation consists of a large (infinite) number of local populations living in patches of habitable environment. Dispersal between patches is modelled by a disperser pool and individuals in transit between patches are exposed to a risk of mortality. Occasionally, local catastrophes eradicate a loc...

Background We have observed persistent desensitization to exogenous norepinephrine after balloon injury. We postulated that this desensitization may be due to a local increase in the release of neuronal norepinephrine. Methods and Results New Zealand White rabbits underwent left iliac artery angioplasty; 4 weeks later, both iliac arteries were harvested. Maximal response to exogenous norepineph...

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SFI WORKING PAPER: 1994-10-056 SFI Working Papers contain accounts of scientific work of the author(s) and do not necessarily represent the views of the Santa Fe Institute. We accept papers intended for publication in peer-reviewed journals or proceedings volumes, but not papers that have already appeared in print. Except for papers by our external faculty, papers must be based on work done at ...

Sandia National Laboratories, Albuquerque, New Mexico 871 85-1 056 PT"3 1 j 3 r 3 q a,,3 We show that Fe, Coy Cu, and Au impurities in Si are strongly gettered to boron-silicideprecipitates formed by supersaturation B implantation and annealing. Effective binding fr energies relative to interstitial solution range from somewhat above 1 to more than 2 eV. The B-Si precipitates formed at temperat...

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In this paper the general form of scattering amplitudes for massless particles with equal spins s (ss → ss) or unequal spins (sasb → sasb) are derived. The imposed conditions are that the amplitudes should have the lowest possible dimension, have propagators of dimension m−2, and obey gauge invariance. It is shown that the number of momenta required for amplitudes involving particles with s > 2...