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- 저자 : Zaveri, Rahul A. (검색결과 2 건)
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Priya Kapoor,Somashekhar SP,Shabber Zaveri,Amit Rauthan,Poonam Patil,Ashwin KR,Rohit Kumar 대한종양외과학회 2021 대한임상종양학회 학술대회지 Vol.2021 No.6
Background/Aims Colorectal anastomosis carries a high risk of leak from 1 to 30 %. Of the many risk factors, lack of anastomotic blood supply is a correctable cause during surgery. With the development of ICG enhanced fluorescence guided imaging system capable of real time monitoring, objective assessment of blood flow to colon has become possible. We believed not only surgical experts but also beginners would be able to draw safe transection lines during surgery Methods Prospective study – October 2018 to August 2019. After distal transection, the line of proximal transection of the bowel was subjectively assessed by the surgical team and marked point B. Volume injected - 3 ml of ICG in a concentration of 2.5mg/ml IV followed by 10ml of distilled water flush. The line of demarcation was identified in the firefly mode and marked point A if it was proximal to clinical judgement point (point B) and as point C if it moved distally. The perfusion images were recorded and assessed in real time. Results Total number of patients was 50. The average Age of the patients was 54years. 32 were male and 18 were female. Line of transection moved proximally in 3 patients, distally in 41 patients and remained the same in 6 patients. Intraoperative decision changed in 88% of our patients Conclusions It has changed the intra operative decision in 88% of our patients. Can avoid anastomotic failure. Splenic flexure mobilisation could have been avoided in 82% of patients. This resolves the ambiguity of precarious blood supply of sigmoid. It is technically easy, reproducible and safe and larger studies are needed to provide evidence for its routine use in robotic rectal cancer surgery.
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Song, Mijung,Liu, Pengfei F.,Hanna, Sarah J.,Zaveri, Rahul A.,Potter, Katie,You, Yuan,Martin, Scot T.,Bertram, Allan K. Copernicus GmbH 2016 Atmospheric Chemistry and Physics Vol.16 No.14
<P>Abstract. To improve predictions of air quality, visibility, and climate change, knowledge of the viscosities and diffusion rates within organic particulate matter consisting of secondary organic material (SOM) is required. Most qualitative and quantitative measurements of viscosity and diffusion rates within organic particulate matter have focused on SOM particles generated from biogenic volatile organic compounds (VOCs) such as α-pinene and isoprene. In this study, we quantify the relative humidity (RH)-dependent viscosities at 295 ± 1 K of SOM produced by photo-oxidation of toluene, an anthropogenic VOC. The viscosities of toluene-derived SOM were 2 × 10−1 to ∼ 6 × 106 Pa s from 30 to 90 % RH, and greater than ∼ 2 × 108 Pa s (similar to or greater than the viscosity of tar pitch) for RH ≤ 17 %. These viscosities correspond to Stokes-Einstein-equivalent diffusion coefficients for large organic molecules of ∼ 2 × 10−15 cm2 s−1 for 30 % RH, and lower than ∼ 3 × 10−17 cm2 s−1 for RH ≤ 17 %. Based on these estimated diffusion coefficients, the mixing time of large organic molecules within 200 nm toluene-derived SOM particles is 0.1-5 h for 30 % RH, and higher than ∼ 100 h for RH ≤ 17 %. As a starting point for understanding the mixing times of large organic molecules in organic particulate matter over cities, we applied the mixing times determined for toluene-derived SOM particles to the world's top 15 most populous megacities. If the organic particulate matter in these megacities is similar to the toluene-derived SOM in this study, in Istanbul, Tokyo, Shanghai, and São Paulo, mixing times in organic particulate matter during certain periods of the year may be very short, and the particles may be well-mixed. On the other hand, the mixing times of large organic molecules in organic particulate matter in Beijing, Mexico City, Cairo, and Karachi may be long and the particles may not be well-mixed in the afternoon (15:00-17:00 LT) during certain times of the year. </P>
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