(C) 2011 American Institute of Physics. [doi: 10.1063/1.3561443]“
“BACKGROUND: Propofol is a sedative-hypnotic with a rapid onset of action. There are only limited data evaluating propofol for flexible
bronchoscopy. We analysed the feasibility and safety of propofol for bronchoscopy in a high output tertiary care centre.
METHODS: Prospective data on patients undergoing flexible bronchoscopy ACY-241 order at the University Hospital Basel, Switzerland, were analysed. Patient demographics, ASA class, Mallampati class, indication for bronchoscopy, bronchoscopic procedures, duration of examination, medication requirements, minor and major adverse events, haemodynamic XL-880 parameters, as well as cough scores during the procedure were documented. Patients were followed up
to discharge from the bronchoscopy suite.
RESULTS: Data from 440 patients with a mean age 60 years (+/- 15.5, 260 male) were analysed. The main indication for bronchoscopy was a suspicion of malignancy. The most common diagnostic procedures were bronchoalveolar lavage in 253 cases (31.5%) and bronchial washing in 174 cases (21.7%). The mean duration of the procedure was 19.6 min (+/- 12.08). The mean propofol dose was 200 mg (+/- 107.5) corresponding to 2.89 mg/kg (+/- 1.70). Minor adverse events included oxygen desaturation in 72 (16.4%), hypotension in 68 (15.4%) and minor bleeding in 11 (2.5%) patients. No major adverse events were recorded. The median decline in systolic blood ACY-241 nmr pressure after initiation of sedation was 14 mm Hg (3-28). A drop in systolic blood pressure greater than 20 mm Hg was observed in 166 of the 440 patients (37%).
CONCLUSION: Propofol sedation for flexible bronchoscopy is feasible and safe.”
“We present
a numerical analysis of the mechanical deformation of carbon nanotube (CNT) nano-rings on flat graphite substrates, which is motivated by our recent experimental findings on the elastic deformation of CNT nano-rings. Our analysis considers a perfectly circular CNT ring formed by bending a straight individual or bundled single-walled nanotube to connect its two ends. The seamless CNT ring is placed vertically on a flat graphite substrate and its respective deformation curvatures under zero external force, compressive, and tensile forces are determined using a continuum model based on nonlinear elastica theory. Our results show that the van der Waals interaction between the CNT ring and the substrate has profound effects on the deformation of the CNT ring, and that the interfacial binding interaction between the CNT ring and the substrate is strongly modulated by the ring deformation.