F-037 * WATER SEAL'S ONE-WAY ACTION IN CHEST DRAINAGE SYSTEMS: WHEN THE PARADIGM FAILS
نویسندگان
چکیده
منابع مشابه
Randomised clinical trial of chest drainage systems.
BACKGROUND Problems in the management of thoracic trauma have stimulated the search for an alternative to underwater seals for drainage of the pleural cavity. A chest drainage bag incorporating a one way flutter valve has been compared with underwater seal drains in a randomised clinical trial. METHODS During June-December 1989 119 patients undergoing elective thoracotomy were randomised to r...
متن کاملWhen systems engineering fails-toward complex systems engineering
We review the lessons learned from problems with systems engineering over the past couple of decades and suggest that there are two effective strategies for overcoming them: (1) restricting the conventional systems engineering process to not-too-complex projects, and (2) adopting an evolutionary paradigm for complex systems engineering that involves rapid parallel exploration and a context desi...
متن کاملWhen the Decreasing Sequence Fails
The classical method for program analysis by abstract interpretation consists in computing a increasing sequence with widening, which converges towards a correct solution, then computing a decreasing sequence of correct solutions without widening. It is generally admitted that, when the decreasing sequence reaches a fixpoint, it cannot be improved further. As a consequence, all efforts for impr...
متن کاملWhen the greedy algorithm fails
We provide a characterization of the cases when the greedy algorithm may produce the unique worst possible solution for the problem of finding a minimum weight base in an independence system when the weights are taken from a finite range. We apply this theorem to TSP and the minimum bisection problem. The practical message of this paper is that the greedy algorithm should be used with great car...
متن کاملWhen Bellman's Principle Fails
We present several examples which show that the well known statements about Markov Decision Processes can fail if the loss function is not bounded.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Interactive CardioVascular and Thoracic Surgery
سال: 2014
ISSN: 1569-9293,1569-9285
DOI: 10.1093/icvts/ivu167.37