Dexmedetomidine-Ketamine or Dexmedetomidine-Midazolam Nebulised Drug Combination as a Premedicant in Children: A Randomised Clinical Trial.

OBJECTIVE: This study was designed to evaluate the clinical efficacy of 2 low-dose nebulised drug combinations of dexmedetomidine-ketamine and dexmedetomidine-midazolam as a premedication in children scheduled for surgery under general anaesthesia. METHODS: Sixty children classified as American Society of Anesthesiologists physical status I, aged between 3 and 10, listed to undergo elective surgeries under general anaesthesia were enrolled in this prospective, randomised, and double-blind trial. Patients were randomly allocated to receive nebulised premedication approximately 30 minutes before the induction of anaesthesia. Group DK (n=30) received combined nebulised dexmedetomidine and ketamine (1 µg kg-1+1 mg kg-1 ) and the dexmedetomidine-midazolam (DM) group (n=30) received combined nebulised dexmedetomidine and midazolam (1 µg kg-1+0.1 mg kg-1 ). All children were anaesthetised with a protocolised anaesthesia technique. The primary end point was the level of sedation when the child was first seen in the operating room 30 minutes after nebulisation. The secondary end points were parental separation and ease of induction, ease of acceptance of IV cannula, mask acceptance, postoperative analgesia, and wake-up behaviour. RESULTS: Studied groups were comparable in demographic data (age, weight, and sex) and duration of anaesthesia. Level of sedation at 30 minutes was significantly greater in the DM group than in the DK group (P =.013) while the two were comparable in parental separation and ease of induction (P =.808). Group DK exhibited superior ease of acceptance of IV cannula (P =.001), mask acceptance score (P =.001), and postoperative analgesia (P =.021). Hemodynamic parameters and oxygen saturation remained comparable at all time intervals as also the wake-up behaviour. CONCLUSIONS: The nebulised combination of low-dose ketamine and dexmedetomidine was a superior combination producing acceptable sedation with enhanced ease of IV acceptance, mask acceptance, and postoperative analgesia in children.

Correlation of preprocedural ultrasound estimated epidural depths in transverse median and posterior sagittal oblique view and body mass index with procedural epidural depths in patients scheduled for surgery under lumbar epidural anaesthesia.

BACKGROUND AND AIMS: Preprocedural lumbar ultrasound (US) is employed for the estimation of epidural depth (ED). This study observed the correlation of preprocedural ED in transverse median (TM), parasagittal oblique (PSO) view, and body mass index (BMI) with procedural ED. METHODS: In a prospective study, 100 female patients, aged 40-65 years, with American Society of Anesthesiologists physical status I/II, BMI 18.5-30 kg m-2 scheduled for surgeries under lumbar epidural blocks were included. In the TM group, preprocedural ultrasonography (USG) was performed in TM view and ED was calculated, whereas in the PSO group, the paramedian sagittal view was used and corresponding markings were done for epidural needle insertion in the midline and paramedian planes, respectively. The primary outcome was the correlation of procedural ED and preprocedural ED in TM and PSO views, respectively. The secondary outcomes included correlation of procedural ED with BMI, comparability of preprocedural, and procedural ED in TM and PSO views. Statistical analysis was performed using Statistical Package for the Social Sciences (SPSS) v19.0 (International Business Machines, USA). RESULTS: The preprocedural and procedural ED was less in the TM group (4.43 ± 0.75 and 4.44 ± 0.75 cm) in comparison to those in the PSO group (4.86 ± 0.53, 4.90 ± 0.54; P = 0.001). Strong correlation was observed in preprocedural and procedural ED [r2 = 0.996 and 0.995]. The procedural ED had strong correlation with BMI [r2 = 0.600, P = 0.001] in the TM group, and weak correlation [r2 = 0.367] in the PSO group [P = 0.01]. The procedural ED was comparable to preprocedural ED in TM and PSO groups. CONCLUSION: Preprocedural US scanning provides an accurate estimate of actual EDs in TM and PSO view.

Point-of-care ultrasound in the airway assessment: A correlation of ultrasonography-guided parameters to the Cormack-Lehane Classification.

BACKGROUND AND AIM: The sonographic assessment of airway in the preoperative period has encouraging results in predicting difficult laryngoscopy. MATERIALS AND METHODS: The prospective, observational study was conducted on 120 patients scheduled for elective surgery requiring general anesthesia and tracheal intubation. The depth of the pre-epiglottic space (Pre-E), the distance from the epiglottis to the midpoint of the distance between the vocal cords (E-VC) was measured sonographically. Similarly, hyomental distance ratio (HMDR) was sonographically measured with head in neutral and extended positions. The primary outcome was the efficacy of Pre E/E-VC, HMDR for predicting difficult laryngoscopy (Cormack-Lehane [CL] Grade 3, 4). The secondary outcome was to correlate these parameters to CL grading. RESULTS: Difficult intubation was observed in 12.5% of patients. The mean ± standard deviation (SD) of Pre E/E-VC ratio was 1.33±0.335, 1.62±0.264 and 1.87±.243, 2.22±.29 for CL Grade 1, 2, 3, and 4, respectively (P = 0.00). The mean ± SD of HMDR was 1.11±.35, 1.12±.29, and 1.07±.39, 1.04 ± 0.01 for CL Grade 1, 2, 3, and 4, respectively (P = 0.00). Pre E/E-VC ratio of more than 1.77 cm had 82% sensitivity, specificity 80%, whereas HMDR less than1.085 had sensitivity 75% and specificity 85.3%, in predicting difficult laryngoscopy (P = 0.00). CONCLUSION: The sonographic measurement of the Pre E/E-VC ratio is a better predictor of CL grading as compared to HMDR. The noninvasive prediction of CL grading can be precisely done by Pre-E/E-VC ratio (range: 0-1.425 corresponds to CL Grade 1; 1.425-1.77 ≈ CL Grade 2; 1.77-1.865 ≈ CL Grade 3, more than 1.865 corresponds to CL Grade 4).

Efficacy of Dexmedetomidine in two Different Doses as an Adjuvant to Lignocaine in Patients Scheduled for Surgeries under Axillary Block.

INTRODUCTION: The effect of adding dexmedetomidine (α2-adrenoceptor agonist) to local anaesthetics in brachial plexus blocks has been evaluated, however there has been no consensus regarding the ideal dose of dexmedetomidine. Without ultrasound axillary block has been considered as the safest approach for brachial block. AIM: To evaluate the efficacy of two doses of dexmedetomidine (0.5 µg/kg and 1 µg/kg) as an adjuvant to lignocaine in patients undergoing forearm surgeries under axillary brachial plexus block. MATERIALS AND METHODS: This prospective randomized controlled study was conducted on 104 adult patients, American Society of Anaesthesiologists (ASA) physical status 1 or 2. They were randomized and given following drug formulations, Group L (n=35) received 23 ml of 2% lignocaine with adrenaline + 7 ml of saline, Group LD0.5 (n=34) received 23 ml of 2% lignocaine with adrenaline + 0.5 µg/kg of dexmedetomidine diluted in saline to make a volume of 7 ml, Group LD1 (n=35) was given 23 ml of 2% lignocaine with adrenaline + 1 µg/kg of dexmedetomidine diluted in saline to make volume of 7 ml, the total volume of drug being 30 ml in each group and concentration of lignocaine 1.5%. The duration of postoperative analgesia and demand for rescue analgesia were the primary outcomes and block characteristics taken as secondary outcome. RESULTS: Sensory and motor block onset times were shorter in Group L than in group LD0.5, LD1 (p < 0.05). Sensory and motor blockade durations were longer in Group LD1, LD0.5 than Group L (p<0.01). Duration of analgesia was longer in Group LD1 than in group LD0.5 and least in Group L (p<0.05). CONCLUSION: Dexmedetomidine (0.5 µg/kg and 1 µg/kg) as an adjuvant in axillary brachial plexus increases the duration of postoperative analgesia and delays the requirement of first dose of analgesic in a dose dependent manner and 1 µg/kg seems to be the near ideal dose of dexmedetomidine as an adjuvant in axillary block.

A dose-finding randomised controlled trial of magnesium sulphate as an adjuvant in ultrasound-guided supraclavicular brachial plexus block.

BACKGROUND AND AIM: Magnesium sulphate (MgSO4) has been used as an adjuvant in brachial plexus block with encouraging results; however, there is no consensus regarding its optimal dose. Thereby, we compared the efficacy of two doses of MgSO4 as an adjuvant in ultrasound (USG) guided supraclavicular brachial plexus block. METHODS: Ninety patients, aged 20-60 years, belonging to American Society of Anesthesiologists physical status 1 or 2, were given USG-guided supraclavicular block. Group B (n = 30) received 20 ml of 0.5%bupivacaine + 5 ml normal saline (NS), Group BM0.5(n = 30) received 20 ml of 0.5%bupivacaine + 3.75 ml NS and 125 mg MgSO4 (1.25 ml) and Group BM1(n = 30) received 20 ml of 0.5%bupivacaine + 2.5 ml NS and 250 mg MgSO4 (2.5 ml). The primary outcome of study was the duration of post-operative analgesia. The normally distributed data were analysed using analysis of variance and categorical data analysed using Chi-square test. RESULTS: Duration of post-operative analgesia was prolonged in Groups BM1 and BM0.5 (665.13 ± 97.874, 475.10 ± 53.294) min respectively as compared to Group B (272.03 ± 40.404 min: P = 0.00). The onset times of sensory and motor block were shorter in Group BM1 (5.17 ± 2.2 min) as compared to Groups BM0.5 and B (8.9 ± 2.3 and 17.7 ± 5.1 min: P = 0.00) respectively. Sensory and motor block durations were prolonged in Group BM1 as compared to BM0.5 and B (P = 0.00). CONCLUSIONS: MgSO4 as adjuvant in brachial plexus block increases the duration of post-operative analgesia. MgSO4 in the dose of 250mg has greater efficacy as compared to 125 mg.