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Background: Fluid therapy is the most challenging and debatable aspect of perioperative care. Choice of administrating intravenous fluid perioperative period varies considerably among anesthesiologist. Aims and Objectives: The aims of this study were to compare the effects of intraoperative administration of balanced crystalloid solution (Plasma-Lyte A®) and 0.9% sodium chloride (NaCl) on acid-base balance in the post-operative period on patients undergoing gastro intestinal surgery at a tertiary care hospital. Materials and Methods: A prospective, randomized, comparative, and observational study was conducted on 80 patients of either sex aged 18-60 years with ASA-l and ASA-II who underwent gastrointestinal surgery which was at first randomly allocated to two equal groups of 40 each. Group 1 received Plasma-Lyte A® as the sole crystalloid and Group 2 received 0.9% NaCl. Intraoperative crystalloid infusion volumes, urinary output, blood loss, and blood transfusion volumes were recorded on hourly basis. Electrolytes (Na+, K+) and arterial blood gases were measured after induction of anesthesia and then every hour in the intraoperative period and at the 1st, 6th, and 12th hour of post-operative period. Results: The demographic data with respect to age, sex, and type of surgery were comparable among the two groups with no significant difference (P>0.05). Intraoperative and post-operative fluid transfusion and blood transfusion were also comparable with no significant difference. On intergroup comparison, serum Na+ conc. of both the groups was comparable and no difference shown at the time of induction, but after 12 hours following operation, there was a significant increase in Group 2 (P<0.05). There was no significant difference in serum K+ concentration in both the groups except at 6-hour postoperatively, there was an increase in K+ concentration in Group 1 (P<0.05). Serum Cl- concentration at post-operative 1st, 6th, and 12th hour interval very significantly increased in Group 2 (P<0.001). A significant decrease in pH (P<0.05) observed in 0.9% NaCl group in comparison to Plasma-Lyte® group when the duration of surgery increased to more than 120 minutes. Conclusion: Plasma-Lyte A® and 0.9% NaCl can be used safely during gastrointestinal surgery as the sole crystalloid. However, chance of developing hyperchloremic metabolic acidosis is more with 0.9% NaCl than Plasma-Lyte A® in prolonged surgery exceeding 2 hours. [ABSTRACT FROM AUTHOR]

Organic solvent nanofiltration is a promising and more sustainable alternative to classic separation processes in multiple industries; however, proposed materials for polymeric membranes with high solvent stability mostly utilize unique or expensive polymers, or are fabricated by complex methods. Herein, a facile method is presented to fabricate crosslinked polyethersulfone membranes with remarkable stability in halogenated and polar aprotic solvents. After preparing the membranes by the conventional non-solvent-induced phase inversion process, a multidentate aromatic amine embedded in the polysulfone underwent diazotization/dediazonization to effectively crosslink the polymer matrix. Membrane performance was easily adjusted from ultra-to nanofiltration via the polymer fraction. The performance of the crosslinked polyethersulfone nanofiltration is similar to the state-of-the-art solvent stable membranes. A weeklong filtration experiment in dimethylformamide and chloroform underlines the membranes' excellent stability. Overall, the range of solvent stability and state-of-the-art performance, combined with high accessibility and scalability, make the presented membranes an ideal platform material. [Display omitted] • Intricately crosslinked PES membranes are prepared via dediazonization • The crosslinked membranes have excellent stability in a wide range of solvents • Membrane performance is preserved even in halogenated and polar aprotic solvents • Selectivity is easily adjustable from the UF to NF range • The presented procedure has a high potential for scalable SRNF membrane manufacture [ABSTRACT FROM AUTHOR]

Background This study was conducted to evaluate oral clonidine and oral midazolam as premedications for general anaesthesia in elective open abdominal surgery. Methods This was a hospital-based study conducted among 100 patients undergoing elective open abdominal surgery carried out in the General Surgery and Gynaecology OT and in the Department of Anaesthesiology of a Tertiary care teaching Hospital over a period of 1 year. Patients were randomly divided into 2 groups of 50 each. Group M(n=50) patients received Tablet Midazolam 7.5mg per orally and Group C(n=50) patients received Tablet Clonidine 150 µg (0.15mg) per orally 60 minutes before the induction of anaesthesia. Results At 60 minutes following the administration of oral midazolam, patients in Group M had extremely significant changes in their sedation scores (SedSco). Changes in sedation score [SedSco] in Group C patients were statistically significant (but less than midazolam) sedation at 60 minutes after administration of oral clonidine. There was statistically extremely significant anxiolysis at 60 minutes after oral midazolam administration in the group M patients' changes in anxiety score (AnxSco). At 60 minutes following the administration of oral clonidine, Group C patients had noticeable anxiolysis (although less than midazolam) according to the changes in their anxiety score [AnxSco]. It was also found that oral Clonidine decreased both the heart rate and Blood Pressure more than oral Midazolam. Clonidine effectively attenuated the cardiovascular stress response associated with laryngoscopy & intubation and following extubation Conclusion Oral clonidine may be considered to be a superior premedication. [ABSTRACT FROM AUTHOR]