Successful Treatment of a Patient with Severe CarbonMonoxide Intoxication Complicated with ARDS UsingECMO and HFO Ventilation
Carbon monoxide (CO) intoxication is a common and underestimated problem. We report a 39-year-old woman who was exposed to CO for more than 12 hours and presented in an unconsciousness state with acute pulmonary edema. Extracorporeal membrane oxygenation (ECMO) and high frequency oscillatory ventilation (HFOV) were used because of acute respiratory distress syndrome (ARDS) and complicated bilateral pneumothorax during hospitalization. ECMO and HFOV were instituted for 30 days and 10 days, respectively. Full recovery of consciousness and cognition were observed, and her activities were not limited in the 6-month follow-up. (Thorac Med 2011; 26: 325-331)
In this paper we study the performance of IEEE 802.11e enhanced distributed channel access (EDCA) priority schemes under finite load and error-prone channel. We introduce a multi-dimensional Markov Chain model that includes all the mandatory differentiation mechanisms of the standard: QoS parameters, CWMIN, CWMAX arbitration inter-frame space (AIFS), and the virtual collision handler. The model faithfully represents the functionality of the EDCA access mechanisms, including lesser known details of the standard such as the management of the backoff counter which is technically different from the one used in the legacy DCF. We study the priority schemes under both finite load and saturation conditions. Our analysis also takes into consideration channel conditions.