137 research outputs found
Sutureless cataract surgery can be sterile surgery
No full textObjective: Previous reports have shown that aqueous contamination may occur in up to 44% of patients undergoing extracapsular cataract extraction, We investigated prospectively the incidence of aqueous contamination after phacoemulsification and posterior chamber intraocular lens implantation performed through a 7-mm scleral tunnel, Methods: Forty-eight consecutive patients undergoing cataract surgery were included in this study. A conjunctival smear was obtained on the day before surgery and resulted negative for the presence of bacteria in all cases, At the beginning of surgery, the eye surface was irrigated with a 5% povidone iodine solution (Betaisodona(R)). Fluid (0.1-0.2 ml) was aspirated from the anterior chamber through a side entry immediately before opening the scleral tunnel and after lens implantation. The samples were cultured for bacteria (aerobic and anaerobic) and fungi, Results: Coagulase negative Staphylococci could be demonstrated in two samples obtained before opening the scleral tunnel, most likely the result of incorrect sample handling, No positive cultures could be recovered from the fluid aspirated at the end of surgery. Conclusions: As opposed to what was published by other authors in the past, no aqueous contamination could be demonstrated at the end of surgery in any patient included in our study, The use of gentamicin in the irrigating solution and/or the different surgical technique (scleral tunnel approach and phacoemulsification) employed may play a major role in eliminating the possibility of anterior chamber contamination at the time of cataract surgery, Also preoperative evaluation of the conjunctival microbial flora as well as careful disinfection of the ocular surface could be contributory factors
Wound infection due to Absidia corymbifera and Candida albicans with fatal outcome
No full textA case of a mixed infection due to Candida albicans and the zygomycete Absidia corymbifera in a 38-year-old, previously healthy, Caucasian male is presented. The infection developed following serial rib fractures, and ruptures of kidney, liver and biliary tract as well as a pancreatic contusion resulting from a traffic accident. During intensive care treatment the patient underwent several surgical procedures but subsequently experienced multi-organ failure and sepsis. Some weeks later, fungal growth was observed macroscopically on the patient's skin and wounds. From wound swabs C albicans and A. corymbifera were grown. Histopathology of abdominal tissue yielded pseudohyphae and coenocytic hyphae. Although surgical debridement and antifungal treatment with amphotericin B and 5-flucytosine were started immediately, the patient died in therapy-refractory septic multi-organ failure
Numerische Verfahren zur Modellierung von akustischen, elektromagnetischen, elastischen und piezoelektrischen Wellenausbreitungsproblemen im Zeitbereich basierend auf der finiten Integrationstechnik
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Optimally accurate second-order time-domain finite-difference scheme for acoustic, electromagnetic, and elastodynamic wave modeling: one-dimensional case
No full textNumerical computation of ultrasonic wave propagation in concrete using the elastodynamic finite integration technique (EFIT)
No full textConcrete is a strongly heterogeneous solid including aggregates, cracks and porosity. It represents an important but also very challenging object for ultrasonic non-destructive testing methods. The elastic wave propagation in this material consists of a complex mixture of multiple mode conversion and multiple scattering which results in a diffusive energy transport. In order to investigate the effect of aggregates, porosity and reinforcement on the applicability and reliability of different testing methods it is useful to model the ultrasonic wave propagation and scattering process explicitly in the time-domain. The elastodynamic finite integration technique represents a stable and efficient numerical scheme to model ultrasonic wave propagation in elastic solids. In the present paper the two- and three-dimensional EFIT code is used to calculate ultrasonic wave propagation and scattering in various concrete specimens modeling pulse-echo, impact-echo and acoustic emission testing methods. The numerical simulations are presented by means of time-domain signals and timedomain wavefield snapshots
Time-domain techniques for the computation and reconstruction of one~dimensional profiles
No full textNumerical computation of ultrasonic wave propagation in concrete using the elastodynamic finite integration technique (EFIT)
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