Effectiveness and Validity of Preoperative Ultrasonographic Airway Assessment and Clinical Screening Tests to Predict Difficult Laryngoscopy: A Prospective, Observational Study.

BACKGROUND: The anticipation of a challenging airway can be demanding in emergency care settings. Due to the patient's clinical condition, executing the pre-intubation clinical screening tests during the management of the airway in an emergency situation can be sometimes troublesome. Ultrasonographic airway assessment may become a helpful tool, but no specific sonographic measurements can precisely visualize the prospect of meeting a difficult airway. Therefore, the present study aimed to verdict some correlation between preoperative sonographic airway assessment parameters and the Cormack-Lehane (CL) grading at laryngoscopic view in patients undergoing general anesthesia with endotracheal intubation. METHODS: This observational study was conducted on 150 elective surgery subjects undergoing general anesthesia. The clinician in the pre-anesthetic clinic performed clinical airway and ultrasonographic airway assessments to predict difficult intubation and correlated with the CL grade viewed at laryngoscopy in the operative room during intubation. The parameters assessed were sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). RESULTS: In this study, the incidence of difficult intubation was 13.3%. The Mallampatti Grading (MPG) showed the maximum receiver operating characteristic (ROC) and area under the curve (AUC) among the clinical predictors, with 86.7% sensitivity. At the same time, the skin-to-hyoid distance has the maximum ROC among the sonographic parameters, and the skin-to-thyroid isthmus has the utmost sensitivity to predict difficult laryngoscopy. CONCLUSIONS: Among the clinical predictors, MPG and the sonographic parameters, like the skin-to-hyoid distance and skin-to-thyroid isthmus, are favorable predictors of difficult laryngoscopy.

A Prospective Evaluation of Percutaneous Vertebroplasty in Osteoporotic Vertebral Compression Fracture Patients.

Background Osteoporotic vertebral compression fracture (OVCF) is a common problem in old age, which causes incapacitating pain and leads to significant disability, morbidity, and mortality. Percutaneous vertebroplasty (PVP), a minimally invasive procedure, results in immediate pain relief with decreased morbidity. The primary aim of this study was to evaluate the quality of life (QOL), as denoted by the Roland-Morris Disability Questionnaire (RMDQ) score. In contrast, the secondary aims were determining pain relief using the 11-point Numeric Pain Rating Scale (NPRS) and vertebral height restoration and wedge angle measurements after PVP. Methodology This prospective, longitudinal, interventional study on the efficacy of PVP was conducted among patients with low back pain due to osteoporotic vertebral collapse in a tertiary care institute. Patients with OVCF were managed by PVP and followed at one week, one month, three months, and six months for improvement in QOL by the RMDQ score and pain relief using the NPRS. The pre and post-vertebroplasty wedge angle and vertebral height (anterior, middle, and posterior columns) at one week and six months were also compared by pre and post-vertebroplasty lateral view skiagrams. Results A total of 24 patients were included in this study based on the inclusion and exclusion criteria. The demographic data were comparable. The RMDQ score showed a statistically significant difference in post-PVP at one week (p = 0.044), one month (p = 0.031), three months (p = 0.022), and six months (p = 0.018). There was a statistically significant difference in the NPRS at six months compared to the pre-PVP status, showing drastic pain relief in patients after PVP. The mean wedge angle (20.5 ± 2.07) measurement was reduced with a statistically significant increase in anterior body height restoration from pre-PVP to six months. There was no significant change in height at the middle and posterior columns compared to the pre-PVP height. Conclusions PVP is an effective, safe, minimally invasive pain and spine intervention for OVCFs with improved QOL and restoration of vertebral height.

Perioperative anesthetic concerns in postcovid mucormycosis patients posted for surgical intervention: An observational Study.

Background: COVID 19 pandemic caused by severe acute respiratory syndrome coronavirus -2 has proven to be the deadliest pandemic till date. Multiple covid waves have hit people hard on each part of the continent throughout the world. The second wave in India turned out to be highly infectious and virulent. Sudden surge in cases of mucormycosis after recovery of COVID surprised many clinician. Mucormycosis being a rapidly progressive and fulminant fungal infection required surgical debridement of necrotic tissue on emergency basis. The fatal combination of immunocompromised status, multisystemic involvement, and difficult airway in these patients pose numerous new challenges regarding anesthetic management. The present study was conducted to outline major concerns and the anesthetic management of patients undergoing surgical resection for rhinoorbital mucormycosis (ROM). Materials and Methods: A retrospective observational study was conducted in our institute for a duration of 2 months (June and July 2021). The data of all the cases posted for ROM was collected from the ENT and Anesthesia record register. Total 70 patients presented with mucormycosis, for surgical debridement out of which 25 patients were posted for surgery under general anesthesia or monitored anesthesia care (MAC). Demographic characteristics, comorbidities, duration of COVID illness, treatment taken during COVID (oxygen therapy/steroid intake), hemodynamic parameters, monitoring methods, and surgical procedures were recorded for each patient. Statistical Evaluation: SPSS version 21.0 was used for data analysis. Mean and SD were used to analyze the difference in mean values, and independent Student's t-test were utilized to compare the quantitative variables. Frequency distribution and percentage were used for qualitative parameters. Significant difference was accepted at P ≤ 0.05 with 95% CI (confidence interval) in the study. Results: Demographic data were comparable with respect to age, gender distribution, and ASA status. Mean duration of Covid illness was (12.18 ± 3.68) days. The mean HbA1C measured was (10.8 ± 1.42). Strong correlation was found between steroid intake and raised HbA1c in all patients (r = 0.77). Regarding the comorbidities, 24 (96%) patients had associated type 2 diabetes mellitus, 16 patients (64%) had pneumonitis, and 1 patient had pulmonary TB and hepatitis. Conclusion: Considering the perioperative risk associated with high HbA1C and pneumonitis, MAC was preferred in majority of cases. Strict hemodynamic monitoring, perioperative glucose control, difficult airway cart, metabolic and electrolyte balance and vigilant peri-operative monitoring are cornerstone for better outcome and short length of hospital stay.

Radiofrequency Treatment of Idiopathic Trigeminal Neuralgia (Conventional vs. Pulsed): A Prospective Randomized Control Study.

BACKGROUND: Idiopathic trigeminal neuralgia (TGN) is a chronic pain disorder causing unilateral, severe brief stabbing recurrent pain in the distribution of one or more branches of the trigeminal nerve. Conventional radiofrequency (CRF) and pulsed radiofrequency (PRF) are two types of minimally invasive treatment. CRF selectively ablates the part of ganglion to provide the relief, but it has been found to be associated with some side effects such as dysesthesia or sensory loss in 6%-28% and loss of corneal reflex in 3%-8% of patients. PRF is a comparatively newer modality which is a nondestructive and neuromodulatory method of delivering radiofrequency energy to the gasserian ganglion to produce a therapeutic effect. AIMS: We aimed to compare the efficacy of CRF with long-duration, fixed voltage PRF in the treatment of idiopathic TGN. SETTING: This study was conducted in a tertiary care center research institute. STUDY DESIGN: This was a prospective randomized trial. MATERIALS AND METHODS: Twenty-seven adult patients of TGN were included in the study and randomly allocated into two groups (CRF and PRF). All procedures were performed operation suite with C-arm fluoroscopic guidance. Both, pre- and postprocedure, the patients were assessed for pain on the Visual Analog Scale (VAS) and Barrow Neurological Institute (BNI) Pain Intensity Scale at 1 week and thereafter at 1, 2, 3, and 6 months. Patients with a BNI score ≥4 after 1 month were considered a failure and offered other modes of treatment. A reduction in VAS score ≥50% and a BNI score <4 were considered as effective. STATISTICAL ANALYSIS: Discreet variables were recorded as proportions, ordinal variables and continuous variables with non-Gaussian distribution as medians with interquartile range, and continuous variables with Gaussian distribution as mean ± standard deviation. Association between ordinal variables was tested by Fisher's exact test/Chi-square test whenever appropriate. Equality of means/median was tested by using paired/unpaired t-test or nonparametric tests depending upon the distribution of data. P ≤ 0.5 was considered statistically significant. Data analysis was performed using STATA version 13.04 windows. RESULTS: Efficacy in terms of decrease in VAS ≥50% at 1 month was 33.33% and 83.33% in the PRF and CRF groups, respectively, which was statistically significant(P = 0.036). Effective reduction in BNI scores at the 7th day, 1 month, and 2 months postprocedure was evaluated and found in 41.67% and 83.33% of patients in the PRF and CRF groups, respectively, which was statistically insignificant (P = 0.089). There was a statistically significant reduction in BNI scores in PRF and CRF group patients at 3 and 6 months (at 3 months, 33.33% and 83.33%, P = 0.036 and at 6 months, 25% and 83.33%, P = 0.012). In the CRF group, mild hypoesthesia was evident in three patients which improved by the end of 1 month while no side effects were seen in the PRF group. CONCLUSION: CRF is a more effective procedure to decrease pain in comparison to long-duration, fixed voltage PRF for the treatment of idiopathic TGN. Although the side effects are more with CRF, they are mild and self-limiting.

Comparison of the Efficacy of Different Arterial Waveform-derived Variables (Pulse Pressure Variation, Stroke Volume Variation, Systolic Pressure Variation) for Fluid Responsiveness in Hemodynamically Unstable Mechanically Ventilated Critically Ill Patients.

INTRODUCTION: This study was conducted to assess fluid responsiveness in critically ill patients to avoid various complications of fluid overload. MATERIAL AND METHODS: This study was done in an ICU of a tertiary care hospital after approval from the institute ethical committee over 18 months. A total of 54 consenting adult patients were included in the study. Patients were hemodynamically unstable requiring mechanical ventilation, had acute circulatory failure, or those with at least one clinical sign of inadequate tissue perfusion. All patients were ventilated using tidal volume of 6-8 mL/kg, RR-12-15/minutes, positive end expiratory pressure (PEEP)-5 cm of water, and plateau pressure was kept below 30 cm water. They were sedated throughout the study. The arterial line and the central venous catheter were placed and connected to Vigileo-FloTrac transducer (Edward Lifesciences). Patients were classified into responder and nonresponder groups on the basis of the cardiac index (CI) after fluid challenge of 10 mL/kg of normal saline over 30 minutes. Pulse pressure variation (PPV), stroke volume variation (SVV), and systolic pressure variation (SPV) were assessed and compared at baseline, 30 minutes, and 60 minutes. RESULTS: In our study we found that PPV and SVV were significantly lower among responders than nonresponders at 30 minutes and insignificant at 60 minutes. Stroke volume variation was 10.28 ± 1.76 in the responder compared to 12.28 ± 4.42 (p = 0.02) at 30 minutes and PPV was 15.28 ± 6.94 in responders while it was 20.03 ± 4.35 in nonresponders (p = 0.01). We found SPV was insignificant at all time periods among both groups. CONCLUSION: We can conclude that initial assessment for fluid responsiveness in critically ill mechanically ventilated patients should be based on PPV and SVV to prevent complications of fluid overload and their consequences. HOW TO CITE THIS ARTICLE: Kumar N, Malviya D, Nath SS, Rastogi S, Upadhyay V. Comparison of the Efficacy of Different Arterial Waveform-derived Variables (Pulse Pressure Variation, Stroke Volume Variation, Systolic Pressure Variation) for Fluid Responsiveness in Hemodynamically Unstable Mechanically Ventilated Critically Ill Patients. Indian J Crit Care Med 2021;25(1):48-53.

To Compare the Changes in Hemodynamic Parameters and Blood Loss during Percutaneous Nephrolithotomy - General Anesthesia versus Subarachnoid Block.

BACKGROUND: Percutaneous nephrolithotomy (PCNL) is done under general anesthesia (GA) in most of the centers. However, associated complications and cost are higher for GA than for regional anesthesia. AIM: The aim of the study was to compare the efficacy of GA versus subarachnoid block (SAB) with regard to intraoperative blood loss and postoperative drop in hemoglobin (Hb) in patients undergoing PCNL. SETTING AND DESIGN: This prospective, randomized, comparative clinical trial was carried out at a tertiary care hospital. After obtaining the institute ethical committee clearance (vide no 57/15), patients were randomly allocated into two groups using table of randomization (n = 30 each), Group A - GA, Group B - SAB. MATERIALS AND METHODS: Intraoperative blood loss was assessed by measuring the Hb of irrigated fluid and postoperative drop in Hb concentration. Other parameters such as intraoperative mean arterial pressure and heart rate were also compared in these groups. STATISTICAL ANALYSIS: The results are presented in frequencies, percentages, and mean ± standard deviation. The Chi-square test was used to compare the categorical variables between the groups. Unpaired t-test was used to compare the continuous variables between the groups. RESULTS: Hemodynamic parameters were similar in both the groups preoperatively. The Hb drop was significant in Group A (1.28 ± 0.35 g.dl-1) as compared to Group B (1.10 ± 0.67 g.dl-1). On calculating Hb in irrigated fluid-blood mixture, it was found to be significantly higher in Group A (1.87 ± 0.44 g.L-1) as compared to Group B (1.25 ± 0.25 g.L-1). CONCLUSIONS: Both GA and SAB are effective and safe in PCNL. However, SAB is associated with less blood loss as estimated by intraoperative blood loss and Hb drop.

Comparison of Orotracheal versus Nasotracheal Fiberoptic Intubation Using Hemodynamic Parameters in Patients with Anticipated Difficult Airway.

BACKGROUND: Both nasal and oral routes can be used for fiberoptic intubation. Often it leads to hemodynamic disturbances, which may have a significant effect in patients with limited cardiopulmonary reserve as well as with cerebrovascular diseases. AIMS: The aim of the study was to evaluate whether there is a clinically relevant difference between the circulatory responses to oral and nasal fiberoptic intubation. SETTINGS AND DESIGN: This was a prospective, randomized, and comparative study. MATERIALS AND METHODS: In this study, a total of 90 patients with the American Society of Anesthesiologist physical status I and II of either sex in the age group of 18-60 years and having anticipated difficult airway (DA) posted for elective surgery under general anesthesia were randomly allocated into two groups. Patients underwent fiberoptic intubation via either oral or nasal route under sevoflurane anesthesia with bispectral index guidance. Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), time taken to intubation, and need of maneuver were measured. STATISTICAL ANALYSIS USED: All the analyses were carried out on SPSS 16.0 version (Inc., Chicago, USA). Mean and standard deviation were calculated. The test of analysis between two groups was done by unpaired t-test. RESULTS: Demographic and DA characteristics were similar in both the groups. Significantly (P < 0.01) lesser alteration in HR, SBP, DBP, and MAP was seen in oral fiberoptic intubation when compared to nasal fiberoptic intubation in the early phase of postintubation. Time taken to intubation was also significantly (P < 0.01) lesser in the oral route compared to the nasal route. CONCLUSIONS: Oral fiberoptic intubation causes less hemodynamic alteration and takes less time in comparison to nasal fiberoptic intubation.

A Study of Vitamin D Level in Critically Ill Patients and Effect of Supplementation on Clinical Outcome.

BACKGROUND: Supplementation of Vitamin-D in Vitamin-D deficient patients may reduce morbidity and mortality in critically ill patients in ICU. AIMS AND OBJECTIVES: The aim of this study is to investigate serum level of Vitamin-D in critically ill patients and supplementation of vitamin-D in deficient patients and finally to compare clinical outcomes between two groups. SETTINGS AND DESIGN: Randomized, prospective and comparative study. MATERIALS AND METHODS: In this study, serum vitamin-D level was investigated in recruited patients and vitamin-D deficient patients were randomly allocated into two groups viz; group-1, group-2. Vitamin-D (sachet CALCIROL 60,000 IU) supplementation was done once a week and twice a week in in group-1 and group-2 respectively, clinical outcomes between two groups were compared in terms of length of ICU stay, need for inotropic support, need for mechanical ventilation and 28 days ICU mortality. STATISTICAL ANALYSIS: Mean and standard deviation were calculated. Test of analysis between two groups was done by t-test and then P value was calculated. RESULTS: No significant difference was found between two groups whether vitamin D supplementation done once or twice weekly (P = 0.24) in terms of length of ICU stay. Patients of group-2 required significantly less inotropic support as compared to group-1 (P = 0.037). There was no significant difference found in duration of mechanical ventilation (P = 0.138) and 28 days ICU mortality (P = 0.284). CONCLUSION: From the above results we concluded that vitamin D supplementation in high dosages may be started in all critically ill patients, who are deficient in serum vitamin D level to get better clinical outcomes.

Effect of Minimally Invasive Pain Intervention in Frozen Shoulder Patients: A Cross-Sectional Study.

BACKGROUND: Adhesive capsulitis or frozen shoulder (FS) is the second most common disorder accounts for 15%-30% shoulder pain and functional disability. Suprascapular nerve (SSN) interventions with corticosteroid alone have shown limited duration efficacy, adding pulsed radiofrequency (PRF) provides long-term relief. AIMS AND OBJECTIVE: We aimed to analyze the efficacy of SSN intervention on pain relief and range of mobility in patients with FS. SETTINGS AND DESIGN: This is a cross-sectional study of 37 patients of FS who underwent SSN interventions in a dedicated pain medicine unit of the department of anesthesiology. MATERIALS AND METHODS: Thirty-seven patients, who underwent SSN interventions for FS and followed for 6 months, were included in this study. Pain (Visual Analog Scale [VAS]), range of motion (ROM) (17), and Oxford 12 point Shoulder Score (OSS) for functional outcomes were recorded. In the final analysis, two subsets of patients who underwent SSN steroid injection or SSN PRF plus steroid were found and compared using Student's t-test paired and independent with P < 0.05 considered significant at 95% confidence interval. RESULTS: The patient population was demographically comparable. Mean VAS score and ROM improved at 1, 3, and 6 months to statistically significant. On comparing the subgroups, the VAS score and OSS in both the SI and PRF groups were significantly improved, but the PRF group showed highly significant improvement, showing better and sustained improvement in the PRF group. CONCLUSION: PRF with steroid injection of the SSN provides better and long-lasting relief from pain and improved mobility in FS patients in comparison to steroid alone.

Effect of Celiac Plexus Neurolysis for Pain Relief in Patients with Upper Abdominal Malignancy: A Retrospective Observational Study and Review of Literature.

BACKGROUND: Abdominal pain from primary cancer or metastatic disease is a significant cause of pain for patients undergoing treatment for the disease. Patient's pain may be resistant or non-responsive to the pharmacological management, hence minimal invasive pain intervention like celiac plexus neurolysis or splanchnic nerve rhizolysis may be required to relieve pain of such patients. OBJECTIVE: The aim of this retrospective study is to assess the effect of celiac plexus neurolysis for pain relief in patients with upper gastro-intestinal malignancies. STUDY DESIGN: This is a retrospective, observational study with short review. METHODS: This retrospective observational study was done in the Pain Medicine unit from 2016 and November 2018. Ninety-four patients with upper abdominal malignancy and unrelenting pain, non-responsive or poorly responsive to pharmacological treatment as per WHO ladder of analgesics, received fluoroscopy-guided celiac plexus neurolysis (CPN). All the patients underwent celiac plexus neurolysis through Trans-Aortic approach and the primary outcome measure was pain as assessed with Visual Analogue Scale (VAS) ranging from 0 to 10; the secondary outcome measures were morphine consumption per day (M), quality of life (QOL) as assessed by comparing the percent of positive responses and complications, if any. These were noted and analyzed prior to intervention and then on day 1, and months 1, 2, 3, 4, 5, 6 following CPN. RESULTS: Follow up was completed 6 months after the procedure. VAS score, daily morphine consumption, and the quality of life showed improvement for the duration of the study. There was some relapse in pain and deterioration in QOL during the fourth to sixth month of pain intervention due to disease progression. Some transient known side effects also occurred. CONCLUSION: Trans-Aortic celiac plexus neurolysis with low volume of alcohol is a safe procedure providing up to 6 months of pain relief and is an effective, well established, minimally invasive procedure for abdominal pain due to primary malignancy or metastatic spread.

Progressive trends in heavy metal ions and dyes adsorption using silk fibroin composites.

Thriving industrialization for human lifestyle headway has seeded the roots of water intoxication with harmful and hazardous toxic metal ions and dyes, which may ingress into food chains and become homicidal or mutation causing for creatures. The degummed functionalized silk fibroin composites with different biomaterials and synthetic materials are able to show adsorption efficiencies equivalent to 52.5%, 90%, 81.1%, 93.75%, 84.2%, and 98.9% for chromium, copper, cadmium, lead, thorium, and uranium ions, respectively, and adsorption capacity of 88.5 mg/g, 74.63 mg/g, 76.34 mg/g, and 72 mg/L for acid yellow 11, naphthol orange, direct orange S, and methylene blue, respectively, which make them desirable solution for water toxicants removal. This review is intended to describe the ability of silk fibroins to adsorb and abolish toxic heavy metal ions and dyes from water reservoirs, thus, providing a way to step toward water sanitation and wholesome living. Graphical abstract.

A Comparative Study for the Analgesic Efficacy and Safety Profile of Fentanyl versus Clonidine as an Adjuvant to Epidural Ropivacaine 0.75% in Lower Abdominal Surgeries.

CONTEXT: Different adjuvants are coadministered with local anesthetics to improve the speed of onset and duration of analgesia, and to reduce the dose, the selection of which is often left to the choice of an anesthesiologist. AIM: The aim of this study was to compare the analgesic efficacy and safety profile of fentanyl and clonidine as an adjuvant to epidural ropivacaine anesthesia. SETTING AND DESIGN: With institutional ethical committee clearance, a prospective, randomized, placebo-controlled double-blind clinical study was conducted at Vivekananda Polyclinic and Institute of Medical Sciences, Lucknow. MATERIAL AND METHODS: Two groups with thirty patients each were randomly allocated to receive 15-20 ml of 0.75% ropivacaine with 75 µg clonidine or 15-20 ml of 0.75% ropivacaine with 75 µg fentanyl, respectively. Block characteristics such as onset of analgesia, maximum level of sensory blockade, complete motor blockade, hemodynamic, time to two-segment regressions, time for rescue analgesia, time to complete motor recovery, and side effects were analyzed. RESULTS: Results showed that the onset of blockade is faster when fentanyl is used as additives. Time for two-segment regression was earlier in fentanyl group but time for rescue analgesia was longer in clonidine group. STATISTICAL ANALYSIS: Two groups were compared by Student's t-test and Chi-square test; ANOVA and significance of mean difference bet were done by Newman-Keuls test. CONCLUSION: Addition of clonidine to epidural ropivacaine provides superior analgesia than the addition of fentanyl to epidural ropivacaine without much difference in side effect profile.

Paraneoplastic Hypoglycaemia: A Rare Manifestation of Pelvic Gastrointestinal Stromal Tumour.

Non-Islet Cell Tumour Induced Hypoglycaemia (NICTH), presenting with recurrent fasting hypoglycaemia is a very rare paraneoplastic syndrome. It usually presents with large metastatic mesenchymal tumours. NICTH secondary to Gastrointestinal Stromal Tumour (GIST) is even rarer. Diagnosis of NICTH is based on the low serum insulin level, low serum concentrations of Insulin Like Growth Factor (IGF-I) and IGF binding protein- III (IGFBP-III) in combination with elevated concentrations of pro-IGF-II. Various Immunohistochemical (IHC) markers are integral to diagnosis of GIST namely 2-deoxyglucose-6-phosphate phosphatase -1(DOG-1), Cluster Differentiation 34 (CD 34), Cluster Differentiation 117 (CD117). The management requires prompt intravenous hydration and glucose infusions followed by surgical resection. We hereby, report a rare case of a 65-year-old female with intractable fasting hypoglycaemia due to overproduction of "big" insulin-like growth factor II diagnosed to have pelvic GIST and managed by Steroids and Imatinib.

Effect of intrathecal hyperbaric bupivacaine with small dose clonidine versus hyperbaric bupivacaine alone in lower abdominal surgeries: A comparative study.

CONTEXT: The continued success of regional anesthetic techniques can be credited due to improved local anesthetic drugs, with lower toxicities and longer duration of action, but still many efforts are being done to increase the duration of the block and postoperative analgesia. Therefore, use of adjuvant drugs for anesthesia is intended to prolong analgesia and preventing deleterious clinical effects of local anesthetics. AIMS: The present study is designed to evaluate effects of intrathecal hyperbaric bupivacaine versus hyperbaric bupivacaine with low dose clonidine on the onset and level of sensory and motor block, the intensity of motor blockade, and time of analgesia required in the postoperative period. SETTINGS AND DESIGN: Study area were our operation theater and postanesthesia care unit of Department of Anesthesiology, this was a prospective, randomized, placebo-controlled, and double-blind study for a period of 1 year comprising of 60 patients. MATERIALS AND METHODS: Patients were randomly allocated into two groups: Group 1 (S) (n = 30): Patients received intrathecal hyperbaric bupivacaine 12.5 mg with normal saline 0.5 ml and Group 2 (C) (n = 30): Patients received intrathecal hyperbaric bupivacaine 12.5 mg with 1 µg/kg clonidine (approximated to 0.5 ml with normal saline). STATISTICAL ANALYSIS: Two groups were compared by Student's t-test, Chi-square test; ANOVA and significance of mean difference bet were done by Newman-Keuls test. RESULTS AND CONCLUSION: Duration of analgesia was prolonged in Group C (363.07 ± 166.30 min) patients compared to Group S patients (226.95 ± 119 min) and they also required less top up analgesic in the postoperative period.

Unilateral visual loss after cervical spine surgery.

This is a case report of a patient who underwent an uneventful surgery for atlanto-axial dislocation in the prone position, after which he developed painless, unilateral loss of vision in the immediate postoperative period. Based on the ophthalmologic findings a probable diagnosis of ischemic optic neuropathy (ION) was made. Although he recovered his visual acuity completely in 1 month, the visual field defects and color vision abnormalities persisted. Intraoperative anemia, hypotension, with or without vasculopathic risk factors, and prolonged surgery in the prone position have been reported as major risk factors for the development of this complication following spine surgery. However, this healthy young man had an uneventful surgery with no such intraoperative complications. ION in this patient could have been due to a combination of factors, such as a malpositioned horseshoe headrest and surgery performed in the prone position, both of which have the potential to raise the intraocular pressure and lower the perfusion pressure of the optic nerve/nerve head. Variations in the blood supply of the optic nerve due to the presence of watershed zones could be another explanation for this dreaded complication.