Thomas Engelhardt

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Recent approaches to global illumination for dynamic scenes achieve interactive frame rates by using coarse approximations to geometry, lighting, or both, which limits scene complexity and rendering quality. High-quality global illumination renderings of complex scenes are still limited to methods based on ray tracing. While conceptually simple, these(More)
Scattering in participating media, such as fog or haze, generates volumetric lighting effects known as crepuscular or god rays. Rendering such effects greatly enhances the realism in virtual scenes, but is inherently costly as scattering events occur at every point in space and thus it requires costly integration of the light scattered towards the observer.(More)
The incidence of unanticipated difficult or failed airway in otherwise healthy children is rare, and routine airway management in pediatric patients is easy in experienced hands. However, difficulties with airway management in healthy children are not infrequent in nonpediatric anesthetists and are a main reason for pediatric anesthesia-related morbidity(More)
Pulmonary aspiration of gastric contents is one of the most feared complications of anaesthesia. Prevention of aspiration by identification of patients at risk, preoperative fasting, drug treatment and various anaesthetic manoeuvres are cornerstones of safe anaesthetic practice. Not surprisingly, the number of articles and case reports regarding the(More)
BACKGROUND Early negative postoperative behavior (e-PONB) is common in children and manifests itself as emergence agitation (EA), emergence delirium (ED), and pain. The objective of this prospective double blind, randomized, placebo-controlled trial was to determine whether IV clonidine or IV fentanyl prior to surgery modifies e-PONB in children. METHODS(More)
The descriptions of total spondylectomy and further development of the technique for the treatment of vertebral sarcomas offered for the first time the opportunity to achieve oncologically sufficient resection margins, thereby improving local tumor control and overall survival. Today, single level en bloc spondylectomies are routinely performed and(More)
Management of the critically ill patient forms a significant proportion of obstetric and gynaecological (O & G) practice. There have however, been very few reports on the management of such patients in intensive care units (ICU). We review all O & G patients admitted to the surgical ICU at King Edward VIII Hospital, Durban, South Africa, and make(More)
BACKGROUND Pediatric tracheal intubation requires considerable expertise and can represent a challenge to many anesthesiologists. Confirmation of correct tracheal tube position relies on direct visualization or indirect measures, such as auscultation and capnography. These methods have varying sensitivity and specificity, especially in the infant and young(More)
The purpose of this pilot study was to compare the effects of sublingual morphine with intravenous morphine in the treatment of postoperative pain following adenotonsillectomy in children. Twenty-nine children scheduled for adenotonsillectomy were randomly assigned to group 1 (n=14) receiving 0.1 mg x kg(-1) sublingual morphine and group 2 (n=15) 0.1 mg x(More)