An easy-to-complete, microwave-assisted, green chemistry, electrophilic nitration method for phenol using Cu(NO 3 ) 2 in acetic acid is discussed. With this experiment, students clearly understand the mechanism underlying the nitration reaction in one laboratory session.
Aims:
The aim of this study is to evaluate the effectiveness of airway sonographic parameters as the predictors of difficult laryngoscopy and to evaluate the validity of combined sonographic and clinical tests.
Materials and Methods:
This prospective and observational study analyzed a sample of 200 patients who were categorized as having easy (Grades 1 and 2) or difficult (Grades 3 and 4) laryngoscopy based on the laryngoscopic criteria of Cormack-Lahane (CL). Sonographic parameters, including the anterior neck soft-tissue thickness at the level of vocal cord (ANS-VC), ANS tissue thickness at the level of hyoid, and ratio of depth of pre-epiglottic space to distance from epiglottis to midpoint of the distance between vocal cords and clinical parameters, including modified Mallampati class, thyromental distance, and hyomental distance ratio (HMDR), were analyzed. Univariate and multivariate regression analysis was used for the statistical analysis.
Results:
Twenty patients (10%) were categorized as having difficult laryngoscopy. Statistically significant differences between patients with difficult and easy laryngoscopy were noted for 5 of 6 parameters. The diagnostic validity profiles showed variable sensitivity (26.5%–87.5%) and good specificity (58.9%–94.2%) and negative predictive value (88.8%–97.03%). ANS-VC has the highest sensitivity (87.50%) and area under curve value (0.887), whereas HMDR showed highest specificity (94.2%) and highest accuracy (89.60%) which means it has low false-positive prediction rate. The combination of tests improved the diagnostic validity profile (highest area under the curve, 0.897).
Conclusion:
Sonographic predictors can help in identifying difficult laryngoscopy. Combined clinical and ultrasonographic parameters showed better validity profiles in comparison to the individual tests.
Background:
Awake fibreoptic nasotracheal intubation is an effective technique for the management of patients with difficult airways. Adequate sedation with effective topicalization of the airway is important to overcome discomfort and achieve intubation successfully.
Aim and Objectives:
Our aim was to compare the effectiveness of dexmedetomidine-midazolam with fentanyl-midazolam infusion for providing conscious sedation during fibreoptic intubation in patients with anticipated difficult airway under topical anaesthesia.
Materials and Methods:
Thirty adult patients of ASA physical status classification I and II with anticipated difficult airway and planned for elective awake nasal fibreoptic intubation under conscious sedation were randomly allocated into two groups. Dexmedetomidine 1 μg.kg-1 diluted in 50 ml saline was infused in Group DM over 10 min and Fentanyl 2 μg.kg-1 diluted in 50 ml saline was infused in Group FM over 10 min. Topicalization of the airway was done in all patients. All patients were assessed for sedation score, ease of endotracheal tube placement, patient comfort and cooperation, tolerance to endotracheal tube, any adverse events and recall of procedure.
Results:
The score of the modified OAA/S was comparable between the groups (
P
> 0.05). Quality of AFOI was comparable in both groups (
P
> 0.05). The intubation time and first EtCO2 were significantly lower in dexmedetomidine group (
P
<0.05). Group DM also showed better hemodynamics and less episodes of desaturation than Group FM.
Conclusion:
Fentanyl-midazolam and dexmedetomidine-midazolam are both effective for awake fiberoptic intubation under topical anesthesia. Dexmedetomidine allows better endurance and more stable hemodynamics.
Background: Patients undergoing caesarean section need to be alert, comfortable and mobile in order to take care of their babies, for which they must be pain free in post operative period. The aim of present study is to compare the analgesic efficacy of TAP block with local anaesthetic infiltration specifically in LSCS patients in reducing patient pain postoperatively, as well as to decrease the analgesic requirements.Methods: The study population consisted of 60 patients posted for elective and emergency caesarean section. They were blindly divided into two groups of 30 patients each. Group T received 40ml 0.25% Ropivacaine in Transverses abdominis plane (TAP) block for postoperative analgesia and group I received 40ml 0.25% ropivacaine as infiltration at incision site for postoperative analgesia. Patients were observed for numeric pain score NPS, analgesic requirements, total analgesic consumption and adverse effects if any.Results: There was highly significant difference in numeric pain scores at 2nd, 6th, 12th and 24th hours (p<0.0001). Both the time for first rescue analgesic and total amount of analgesic consumed are statistically significant (p<0.0001).Conclusions: TAP block is an effective postoperative analgesic procedure for post caesarean section patients.
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