Coaxial Drainage Versus Standard Chest Tube After Pulmonary Lobectomy: A Randomized Controlled Study

Objectives: Chest tubes are routinely inserted after thoracic surgery procedures in different size and numbers. The aim of this study is to assess the efficacy of Smart Drain Coaxial drainage compared with two standard chest tubes in patients undergoing thoracotomy for pulmonary lobectomy.Methods: Ninety-eight patients (57 males and 41 females, mean age 68.3±7.4 years) with lung cancer undergoing open pulmonary lobectomy were randomized in two groups: 50 received one upper 28-Fr and one lower 32-Fr standard chest tube (ST group) and 48 received one 28-Fr Smart Drain Coaxial tube (SDC group). Hospitalization, quantity of fluid output, air leaks, radiograph findings, pain control and costs were assessed.Results: We performed 33 right upper lobectomies (17 ST, 16 SDC), 25 right lower (15 ST, 10 SDC), 20 left upper (8 ST, 12 SDC) and 19 left lower (10 ST, 9 SDC). SDC group showed shorter hospitalization (7.3 vs 6.1 days, p=0.02), lower pain in postoperative day-1 (p=0.02) and a lower use of analgesic drugs (p=0.04). Pleural effusion drainage was lower in SDC group in the first postoperative day (464±143 ml vs 408±141 ml, p=0.04) and regarding the average of the first three days (374±96 ml vs 324±95 ml, p=0.01). No difference in terms of fluid retention, residual pleural space, subcutaneous emphysema and complications after chest tubes removal was found. Conclusions: Smart Drain Coaxial chest tube seems a feasible option after thoracotomy for pulmonary lobectomy. The SDC group showed a shorter hospitalization and a decreased analgesic drugs use and, thus, a reduction of costs.

CFD analysis for counter flow in concentric tube heat exchangers

A device may be a device worked for the sensible heat exchange beginning with one liquid then onto the attendant, paying very little reference to whether or not the liquids square measure isolates by a powerful divider in order that they ne'er mix, or the liquids square measure particularly in touch. reliably get some data concerning in device progression is creating to form productive, traditionalist and stinting heat exchangers, where for the duration of the planet. Strengthening the function for this alteration wants associate degree association. In most up-to-date 5 years coaxial tube heat exchangers use unnatural convection to cut down the temperature of a operating liquid whereas raising the temperature of the cooling medium. The motivation driving this paper is to utilize ANSYS FLUENT12.1 programming and hand counts to interrupt down the temperature drops as a neighborhood of each straight speed and delta temperature and the way each modification with the opposite. every gleam money dealer show was worked in steps and examined in transit till the purpose that the instant that each parallel stream and counter stream heat money dealer models were created. The outcomes were thought of between every model and among parallel and counter stream with fouled funneling. Turbulent stream was conjointly impecunious down amidst the distinction within the shine exchangers to choose its impact on heat exchange. whereas clearly the fouled heat money dealer had a lower execution and during this manner cooled the operating liquid less, the execution of the counter heat money dealer out of the blue of the parallel heat money dealer.

Numerical Simulation of Atmospheric Pressure Glow Discharges in Coaxial Tube

The dynamics of atmospheric pressure glow discharges in coaxial tube have been numerically studied by a self-consist, one-dimensional fluid model. An asymmetric discharge current pulse, which operated in glow mode, was obtained in the cylindrical geometry. As the frequency or the voltage peak is increased, the discharge transits into a period-two state.