Atropine Requirement Research Articles

The role of a combination of N-acetylcysteine and magnesium sulfate as adjuvants to standard therapy in acute organophosphate poisoning: A randomized controlled trial

BackgroundMortality in acute organophosphate (OP) poisoning remains high despite current standard therapy with atropine and oximes. Due to dose-limiting side effects of atropine, novel therapies are targeting other putative mechanisms of injury, including oxidative damage, to reduce atropine dosage. ObjectivesN-acetylcysteine (NAC) and magnesium sulfate (MgSO4) have different mechanisms of actions and should act synergistically in OP poisoning. In this study, we wanted to evaluate whether this novel combination, used as an adjuvant to standard care, could improve clinical outcomes. MethodsThe study was conducted in the Emergency Department and ICU of AIIMS Bhubaneswar (a tertiary care center and government teaching institute) between July 2019 and July 2021. Eighty-eight adult patients with history and clinical features of acute OP poisoning were randomly allocated (1:1) into two groups. The Study group received 600 mg NAC via nasogastric tube thrice daily for 3 days plus a single dose of 4 g Inj. MgSO4 IV on first day and the Control group received suitably matched placebo (double-blinding) – in addition to standard care in both the groups. The primary outcome measure was to compare the total dose of Inj. Atropine required (cumulative over the entire treatment duration) between the control group and the study group receiving NAC and MgSO4. The secondary outcome measures were lengths of ICU and hospital stays, need and duration of mechanical ventilation, the differences in BuChE activity, oxidative stress biomarkers – MDA and GSH levels, the incidences of adverse effects including delayed sequalae like intermediate syndrome and OPIDN, and comparison of mortality between the two groups. ResultsData from 43 patients in Control and 42 patients in Study group was finally analyzed. The baseline parameters were comparable. Total atropine requirements were lower in the Study group [175.33 ± 81.25 mg (150.01–200.65)] compared to the Control [210.63 ± 102.29 mg (179.15–242.11)] [Mean ± SD (95% CI)], but was not statistically significant. No significant differences in any of the other clinical or biochemical parameters were noted. ConclusionThe N-acetylcysteine and MgSO4 combination as adjuvants failed to significantly reduce atropine requirements, ICU/hospital stay, mechanical ventilatory requirements, mortality and did not offer protection against oxidative damage.

Evaluation of the Perioperative Effects of Dexmedetomidine and Midazolam-Ketamine Premedication in Strabismus Surgery.

To evaluate the effects of intranasal dexmedetomidine and midazolam-ketamine combination for premedication on sedation quality, oculocardiac reflex development, mask tolerance, and separation from parents in children who would undergo strabismus surgery. A total of 74 patients aged 2 to 11 years, were divided into two groups. The dexmedetomidine group (n = 37) received 1 mcg/kg of dexmedetomidine and the midalozam-ketamine group (n = 37) received 0.1 mg/kg of midazolam and 7.5 mg/kg of ketamine combination intranasally. Mean arterial pressure, peripheral oxygen saturation, Ramsay Sedation Scale values, and heart rate were recorded before and after the premedication. The children's separation from the family scores were evaluated and recorded. The mask compliance was evaluated and recorded. Patients who developed oculocardiac reflex and were administered atropine were recorded. In the postoperative period, nausea and vomiting, recovery times, and postoperative agitation were evaluated. Ramsay Sedation Scale scores, mask acceptance, and family separation scores were similar in both groups (P > .05). Oculocardiac reflex was observed more in the dexmedetomidine group (P = .048). Atro-pine requirement and postoperative nausea and vomiting rates were similar in both groups (P > .05). Mean arterial pressures and heart rates were significantly lower in the dexmedetomidine group during the pre-medication period. The recovery time was longer in the midazolam-ketamine group (P < .001). The incidence of postoperative agitation was significantly lower in the midazolam-ketamine group (P = .001). The sedation efficacy of intranasal dexmedetomidine and midazolam-ketamine combination that were given in premedication was similar. Oculocardiac reflex was observed more with dexmedetomidine. The recovery time was prolonged in the midazolam-ketamine group, but postoperative agitation was observed less. [J Pediatr Ophthalmol Strabismus. 2023;60(6):427-434.].

Clinical Evaluation of Plasma Cholinesterase with Clinical Symptomatology in Organophosphorus Poisoning

Objective: Level of plasma cholinesterase and its association with clinical manifestations. Methods: This is a prospective study and observation study of 50 cases of organo phosphorus poisoning compound admitted in casualty and intensive care department. In present study we were evaluated plasma cholinesterase levels and correlate with clinical symptomatology in organo phosphorus poisoning, also included patient requiring ventilator support in respiratory failure patients. Prior approval for the study and the protocol was obtained from the institution ethical committee. In present study, serum cholinesterase estimation was repeated on after 6 hours, 12 hours, 24 hours, 48 hours, 96 hours and 7th day of stay in intensive care unit. The serum cholinesterase activity was measured by Genx cholinesterase butyryl thiocholinemethod (quantitative determination of cholinesterase in human serum). Conclusion: In present study 50 cases of organophosphorus compound poisoning admitted to our tertiary care centre. Commonest age group 21 to 30 years and 31 to 40 years. Serum cholinesterase is a useful marker for predicting clinical outcome in op poisoning as marked reductions are associated with increased need for ventilator support, atropine requirement, duration of hospital stay and outcome. Serum cholinesterase levels correlated well with clinical manifestation, severity of poisoning, ventilator support required or not and outcome.

Comparison of phenylephrine and norepinephrine for treatment of spinal hypotension during elective cesarean delivery- A randomised, double-blind study.

Hypotension following subarachnoid block for cesarean delivery (CD) is common. We compared the effect of bolus administration of norepinephrine and phenylephrine on umbilical artery pH (primary objective) and their efficacy for the treatment of maternal hypotension (secondary objective) in term parturients undergoing elective CD under spinal anesthesia. In a randomized, double-blinded study, parturients received 1 mL boluses of either phenylephrine 100 μg/mL (group phenylephrine; n = 45) or norepinephrine 7.5 μg/mL (group norepinephrine; n = 45) whenever maternal systolic blood pressure decreased to ≤80% of baseline. Maternal hemodynamic changes, vasopressor, and atropine requirement and neonatal outcome (umbilical cord blood gas analysis, Apgar scores, neonatal neurobehavioral response) were assessed. The Apgar scores and umbilical cord blood gas analysis were comparable between groups. The neurobehavioral scale score was significantly higher in group NE compared with that in group PE at 24 h and 48 h; P = 0.007 and 0.002, respectively. The number of vasopressor doses and time to the first vasopressor requirement for maintaining systolic pressure >80% of baseline was comparable in both groups. Incidence of bradycardia (P = 0.009), reactive hypertension (P = 0.003), and dose requirement of atropine (P = 0.005) was higher in group PE compared with group NE. In term normotensive parturients who received bolus norepinephrine 7.5 μg or phenylephrine 100 μg for the treatment of post-spinal hypotension during CD, neonatal umbilical cord blood gas analysis and Apgar scores were comparable. Norepinephrine use was associated with a lower incidence of maternal bradycardia and reactive hypertension compared with phenylephrine.

Prognostic Value of Long Corrected QT Interval on Electrocardiogram in Acute Organophosphate Poisoning: A Cohort Study

Introduction: According to data available from National Poison Information Centre India, suicidal poisoning with household agents (organophosphates, carbamates etc.) is the most common modality of poisoning. There are reports suggesting relationship between prolonged corrected QT interval and the severity of Organophosphate (OP) poisoning. Corrected QT (QTc) interval is measured in 12 lead electrocardiograms taken on admission. Aim: To assess prognosis of acute organophosphate poisoning patients by studying association of corrected QT interval with its complications and mortality. Materials and Methods: The cohort study was conducted at Medicine Department of Medical College, Baroda and Sir Sayaji General Hospital, Vadodara, Gujarat, India, from December 2017 to November 2018. The study included 60 patients with a history of OP poisoning. The QTc interval in electrocardiogram was determined by using the Bazett formula. Prognostic importance of QTc interval was assessed by correlating it with Paradeniya Organophosphorus Poisoning Scale score, hospital stay, atropine requirement, requirement of ventilatory support and mortality. Data was analysed by using descriptive statistics and Chi-square test. Results: The organophosphate poisoning was seen more in younger age group, between 18-29 years (68.4%). The QTc prolongation was seen in 12, 80% of patients in moderate grade of Paradeniya Organophosphorus Poisoning Scale and in 9 (20%) patients among mild grade of Paradeniya Organophosphorus Poisoning Scale (p-value=0.0001). Amongst patients who needed hospital stay for more than 7 days, QTc prolongation was seen in 43% of patients, and in patients who needed hospital stay for less than 7 days QTc prolongation was seen in 9% of patients (p-value=0.0223). Statistically significant association was seen between atropine ampule requirement and QTc prolongation. Total 29 (48.3%) patients developed respiratory depression, and amongst them 19 (65.5%) had QTc prongation (p-value &lt;0.0001). Thirteen (22%) patients died and amongst them 12 (92.31%) had QTc prolngation. In those who survived (47,78%) only 9 (19.15%) had QTc prolongation (p-value &lt;0.0001). Conclusion: Prolonged QTc interval in electrocardiogram is a good prognostic indicator in patients with organophosphorus poisoning. Early identification of prolonged QTc interval and subsequent timely shifting of patients to Intensive Care Unit (ICU) and subsequent intensive management in a patient of OP poisoning would be of profound value at any level of health care setting for favourable outcomes.

Combined spinal epidural anesthesia in obese parturients undergoing cesarean surgery

There is asignificant increase in number of obese pregnant women worldwide. Obese parturients undergoing cesarean section have a higher risk for hypotension and require higher doses of vasopressors following spinal anesthesia compared to nonobese parturients. This study aimed to compare the maternal hemodynamic changes when combined spinal-epidural anesthesia (CSEA) is induced in the left lateral decubitus and sitting positions in obese pregnant women undergoing elective cesarean section. In this study, pregnant women with full-term gestation diagnosed as obese undergoing elective cesarean section were included. Two groups were formed: the CSEA was performed in left lateral position in groupI (n = 50) and in sitting position in groupII (n = 50). At the end of the CSEA procedure, patients were placed in the supine position. When the sensory block reached at the upper level of T6 dermatome, surgery was initiated. Hemodynamic, anesthetic and neonatal parameters were recorded. In all patients, CSEA was successful and sufficient anesthesia was provided for surgery. Time to reach T6 dermatome sensory level in groupII was found to be longer than groupI (P = 0.011). At 20 min after spinal injection, the maximum sensory block level was similar in both groups. There were no significant differences between groups in terms of sensory block time and the time to requiring postoperative supplemental analgesics. There were no significant differences in terms of the volume of intravenous fluid administered, ephedrine and atropine requirements between groups. Both groups had similar systolic blood pressure, heart rate and oxygen saturation values during surgery and postoperatively. While both groups had similar diastolic blood pressure (DBP) values during surgery and at the 1st postoperative hour, groupII had lower DBP values at the 2nd postoperative hour compared with groupI (P = 0.04). Left lateral decubitus and sitting positions during performance of CSEA lead to similar maternal hemodynamic changes in obese pregnant women undergoing cesarean section.

Role of left uterine placement in maternal care bundle for the prevention of spinal anesthesia-induced hypotension in cesarean section

Background Hypotension is the most common serious scenario in patients undergoing cesarean sections under spinal anesthesia. Care bundles have been employed using a set of three to five approaches with the aim to prevent and manage hypotension after spinal anesthesia. This study was conducted to determine the effectiveness of left uterine placement in maternal care bundle for the prevention of spinal anesthesia-induced hypotension in cesarean section. Patients and methods A total of 100 parturients age 25–35 years with American Society of Anesthesia grades I and II, undergoing elective cesarean section under spinal anesthesia, were assigned into two equal groups at random: group A and group B (each group n=50). Both groups were subjected to a bundle of care using 4-mg ondansetron diluted in 10-ml normal saline given slowly intravenous for 5 min before the induction of spinal anesthesia, and spinal anesthesia was initiated using hyperbaric bupivacaine with a constant dose (10 mg), and administration of intravenous ephedrine 9 mg was done after spinal anesthesia had been cited. Group A was subjected to additional parameter in the care bundle, including patient's suitable position with left displacement of the pregnant uterus. Mean arterial blood pressure (MABP) and heart rate (HR) were recorded every 5 min for 45 min after spinal anesthesia. The total ephedrine and atropine requirements were also determined. Results Both groups showed a nonsignificant difference of the MABP and HR at the baseline measurement values. Follow-up of MABP and HR values every 5 min for 45 min after the onset of spinal anesthesia showed a statistically significant decrease in both groups. Overall consumption of ephedrine and atropine showed statistically significant decrease in group A compared with group B (P&lt;0.001 and 0.01, respectively). By comparing the effect size between both groups using Cohen's d test regarding MABP, HR measurements, and total dose of ephedrine and atropine, we found that it had a small effect size. Conclusion The application of left uterine placement is an important and effective parameter in a maternal care bundle for decreasing the incidence of postspinal anesthesia hypotension in parturients undergoing elective cesarean section.

Effect of Intravenous Ondansetron on Spinal Anesthesia-Induced Hypotension and Bradycardia: A Randomized Controlled Double-Blinded Study.

Background:Spinal anesthesia is a safe anesthetic technique commonly practiced. However, it is associated with hypotension (33%), bradycardia (13%), and shivering which are induced by hypovolemia, sympathetic blockade, and Bezold–Jarisch reflex through intracardiac serotonin (5HT3) receptors and vagus nerve.Aim:To study the effect of intravenous (i.v.) ondansetron on hypotension and bradycardia induced by spinal anesthesia.Setting and Design:This was a randomized controlled double-blinded study done in a tertiary care teaching hospital.Methods:Of 140 patients, 70 in Group A received 2 mL of i.v. ondansetron 4 mg and 70 in the Group B received 2 mL of i.v. normal saline. 3 mL of 0.5% hyperbaric bupivacaine was injected intrathecally. Measurements of blood pressure and heart rate (HR) were taken every 3 min for 30 min after spinal anesthesia was performed. Mean arterial pressure (MAP) drop more than 20% was considered as incidence of hypotension and ephedrine 6 mg i.v. was given. HR drop >20% was regarded as bradycardia and atropine 0.5 mg i.v. was given.Statistical Tests:Quantitative data were analyzed using ANOVA test and qualitative data were analyzed using Chi-square test.Results:Both groups are comparable in demographic data. Four (5.7%) patients in Group B and no patients in Group A had incidence of bradycardia and atropine requirement (P = 0.120). There was no statistically significant difference in systolic blood pressure, diastolic blood pressure, and MAP. 19 (27%) patients in Group A and 33 (47.1%) in Group B required ephedrine with P = 0.029. 12 (17.1%) in Group B and no patients in Group A had shivering with P = 0.0001.Conclusion:Our study indicates that prophylactic use of ondansetron before spinal anesthesia significantly reduces the requirement of ephedrine and shivering.

Optimum compatibility of ropivacaine and sufentanil for isobaric spinal anesthesia in caesarean section

Objective To investigate the optimum compatibility of ropivacaine and sufentanil for isobaric spinal anesthesia in caesarean section. Methods A total of 160 nulliparous parturients who were at full term with a singleton fetus, of American Society of Anesthesiology physical status Ⅰ or Ⅱ, scheduled for elective caesarean section under subarachnoid block, were divided into 4 groups (n=40 each) using a random number table method: 1% ropivacaine 1.5 ml (15 mg)-normal saline 3.5 ml group (group A), 1% ropivacaine 1.2 ml (12 mg)-sufentanil 0.5 ml (5 μg)-normal saline 3.3 ml group (group B), 1% ropivacaine 1 ml (10 mg)-sufentanil 0.5 ml (5 μg)-normal saline 3.5 ml group (group C), and 1% ropivacaine 0.8 ml (8 mg)-sufentanil 0.5 ml (5 μg)-normal saline 3.7 ml group (group D). Drugs were injected in cephalad direction at a rate of 0.1 ml/s.The upper spread of sensory block, degree of motor block, abdominal muscle tension, traction response, requirement for atropine and ephedrine and neonatal Apgar scores were recorded. Results Neonatal Apgar scores were all within the normal range.A, B and C groups had similar upper spread of sensory block which was higher than that in group D. The onset time of block was significantly prolonged, and the requirement for atropine and ephedrine was increased in group A as compared with B, C and D groups (P 0.05). The requirement for supplemented epidural local anesthetics was 30% (12 cases) in group D. The recovery time to ambulation was significantly shorter in C and D groups than in A and B groups(P 0.05). Conclusion One percent ropivacaine 1 ml (10 mg)-sufentanil 0.5 ml (5 μg)-normal saline 3.5 ml is the optimum compatibility of ropivacaine and sufentanil for isobaric spinal anesthesia in caesarean section. Key words: Amides; Sufentanil; Anesthesia, spinal; Cesarean section

COMPARATIVE STUDY OF COMMONLY PRACTICED ATROPINIZATION REGIMENS IN ACUTE ORGANOPHOSPHORUS COMPOUND POISONING

Aim of the study: Effect of atropinization with different methods. Outcomes in terms of duration of hospital stay and patients recovery. Methodology: An open-label randomized clinical trial was conducted in, Shri B M Patil Medical College Hospital and Research Centre, Vijayapura, Karnataka. 108 individuals with OPC poisoning .We compared two groups that used a titrated dosing protocol based on a structured monitoring sheet for atropine infusion with another group using an ‘ad hoc’ regime. The aim was to compare the efficacy and safety of conventional bolus doses with individualized incremental doses of atropine for atropinization followed by continuous atropine infusion for management of OPC poisoning. Result: Out of 108 patients, 54 patients received conventional bolus dose atropine (group A) and 54 patient received rapidly incremental doses of atropine followed by infusion (group B).36 subjects analyzed in group A and 32 in group B for moderate to severe poisoning. The mortality in group A was 11.1%(4/36) and in group B was 6.3%(2/32).The mean duration of atropinization in group A was 5.8hrs (348) in minutes compared to time 26.9minutes for group B. Conclusion: Administration of atropine using a fixed algorithm is easy and effective in providing the atropine requirement in management of early phase of acute OPC poisoning. Rapid incremental dose atropinization followed by atropine infusion reduces mortality and morbidity from OPC poisoning and shortens the length of hospital stay and early recovery .Incremental atropine and infusion should become the treatent of choice for OPC poisoning. Keywords: Organophosphate compound; Atropine toxicity; Organophosphorus poisoning; Atropinization protocols.

Effects of different depths of sedation on serum adiponectin concentrations in elderly patients undergoing general anesthesia

Objective To evaluate the effects of different depths of sedation on serum adiponectin (ADP) concentrations in elderly patients undergoing general anesthesia. Methods A total of 120 elderly patients of both sexes, aged 65-83 yr, weighing 45-75 kg, of American Society of Anesthesiologists physical status Ⅱ or Ⅲ, undergoing elective noncardiac surgery under general anesthesia, were divided into Ⅰ and Ⅱ groups (n=60 each) using a random number table.Propofol was given by closed-loop target-controlled infusion, and bispectral index value was maintained at 40-50 in group Ⅰ and at 50-60 in group Ⅱ.The cognitive function was assessed by the Montreal Cognitive Assessment at 1 day before operation ant 1 and 7 days after operation.Blood samples were collected from the internal jugular vein immediately before surgery, at 2 h after the beginning of surgery and at 1 and 7 days after surgery for determination of serum ADP and S-100β protein concentrations. Results Compared with group Ⅰ, Montreal Cognitive Assessment scores were significantly increased at 1 and 7 days after surgery, the serum concentrations of ADP were increased and S-100β protein concentrations in serum were decreased at 1 and 7 days after surgery, and the intraoperative requirement for ephedrine and atropine and incidence of postoperative cognitive dysfunction were decreased during surgery in group Ⅱ (P<0.05). Conclusion Maintaining BIS value at 50-60 can reduce the development of postoperative cognitive dysfunction, which is related to the increased concentration of serum ADP in elderly patients undergoing general anesthesia. Key words: Electroencephalography; Aged; Cognition disorders; Adiponectin

Study of Effect of Magnesium Sulphate in Management of Acute Organophosphorous Pesticide Poisoning.

Background:Organophosphorus compound poisoning (OPCP) is a major public health problem in developing countries like India. Atropine and oximes remain the main-stay of management. Magnesium sulfate (MgSO4) has shown benefit in the management of OPCP.Aims:This study was designed to assess the effect of MgSO4 on outcome in OPCP patients admitted to Intensive Care Unit (ICU).Settings and Design:Double-blind prospective randomized clinical trial in an ICU of tertiary care institution.Methods:One hundred patients (50 in each group) of OPCP, confirmed by history and syndrome of OPCP with low plasma pseudocholinesterase, aged between 18 and 60 years were studied. Magnesium group (Group M) received 4 g of 20% MgSO4 infusion over 30 min at admission to ICU, control group (Group C) received normal saline placebo in the same manner. Patients were assessed for the need for intubation, requirement of atropine, duration of mechanical ventilation, duration of ICU stay, and its effect on mortality.Statistical Analysis:Chi-square test and Fisher's exact test for categorical data, independent sample t-test, and paired t-test for nominal data.Results:Demographics and basal serum magnesium levels were comparable. Atropine requirement was higher in Group C (74.82 ± 22.39 mg) compared to Group M (53.11 ± 45.83 mg) (P < 0.001). A total of 33 patients in Group C and 23 patients in Group M required intubation, respectively (P = 0.043). The mean duration of mechanical ventilation was 4.51 ± 2 days in Group C compared to 4.13 ± 1.6 days in Group M (P = 0.45). ICU stay was 5.36 ± 2.018 days in Group C compared to 4.54 ± 1.581 days in Group M (P = 0.026). There was no significant difference in mortality between the groups.Conclusion:Four grams of MgSO4 given to OPCP patients within 24 h of admission to ICU, decreases atropine requirement, need for intubation, and ICU stay.

Intravenous dexmedetomidine as an adjunct to subarachnoid block: A simple effective method of better perioperative efficacy.

Background and Aim:Dexmedetomidine (D) is a α2 agonist, has anesthetic and analgesic-sparing property. The objective of this study was to evaluate the effect of intravenous (I.V.) dexmedetomidine on the duration of sensory and motor block, postoperative analgesia, the level of sedation and side effect.Material and Methods:Sixty patients were randomly divided into two groups of thirty each. Group D received dexmedetomidine infusion @1 mcg/kg over 10 min and then @ 0.6 mcg/kg/h for rest of duration during surgery, Group C (control) received a similar volume of normal saline infusion before spinal anesthesia with 3 ml of bupivacaine 0.5%. Time of onset and regression time for sensory and motor blockade, the maximum upper level of sensory blockade, duration of postoperative analgesia, Ramsay sedation score and hemodynamic parameters were recorded. Intraoperative bradycardia and atropine requirement along with other side effect were also recorded.Results:The duration of sensorimotor block was significantly longer in D Group (341.7 ± 20.8 min for sensory block and 278.0 ± 11.0 min for motor block) as compared to control group (329.5 ± 22.1 min for sensory block and 250.0 ± 14.8 min for motor block), which was statistically significant (P < 0.05). The mean time for two dermatomal regression of sensory blockade was significantly prolonged in dexmedetomidine group (115.5 ± 8.7 min) compared to control group (95.8 ± 11.4) (P < 0.001). Intraoperative Ramsay sedation scores were significantly higher in D Group (mean - 3.4 ± 0.7, range – 2–4) as compared to C Group (mean - 2.9 ± 0.3, range – 2–4) (P < 0.001). 26.7% (8/30) cases had bradycardia that required atropine as compared to control group (2/30), and none of the patients in the dexmedetomidine group had postoperative shivering as compared to 10% in control group (P = 0.056). Statistical analysis was performed with statistical package for the social science version-20 using analysis of variance/Chi-square test/unpaired t-test, and P < 0.05 was considered statistically significant.Conclusion:I.V. dexmedetomidine significantly prolongs the duration of sensory and motor block of bupivacaine spinal anesthesia. Dexmedetomidine provides an excellent sedation during surgery.

Dosis de carga de Dexdor® y nivel óptimo de sedación durante procedimientos de cirugía oral y maxilofacial en régimen ambulatorio: un estudio observacional

IntroductionDexdor® do not include the possibility of loading dose, which could increase time to achieve adequate sedation for ambulatory procedures. The objective of this study was to evaluate the effect of several loading dose of dexmedetomidine in the time to achieve and maintain an optimal level of sedation and its clinical hemodynamic repercussion. Material and methodsThe IRB approved this observational study for patients that underwent oral and maxillofacial ambulatory surgery under dexmedetomidine at the University of Navarra Clinic from February 2013 to November 2014. According to the loading dose the patients were grouped into 3 categories:<0.5, 0.5, and>0.5μg/kg. Optimal level of sedation was defined as bispectral index<85. Data were analyzed using survival analysis techniques. Vasoactive drugs requirements was evaluated using exact logistic regression. ResultsEighty-one patients were evaluated. Hazard ratios for patients in 0.5 and >0.5μg/kg loading dose categories for achieving a bispectral index<85 were 1.5 (95% CI 0.9, 2.6) and 1.8 (95% CI 0.8, 3.9), respectively, compared with the lowest category. Five patients (6.2%) required atropine for bradycardia. Patients in the group>0.5μg/kg showed greater risk of requiring atropine compared with the group<0.5μg/kg (odds ratio 2.2; 95% CI 0.03, 183). ConclusionLoading dose of dexmedetomidine>0.5μg/kg appears minimize the time to achieve and maintain an optimal level of sedation during the first 60min of procedure. Further investigation to elucidate the association between loading dose of dexmedetomidine and subsequent atropine requirements may be warranted.

Etilefrina vs. fenilefrina en hipotensión por anestesia espinal para cesárea: ensayo clínico multicéntrico, controlado, aleatorizado y doble ciego

IntroductionHypotension after spinal anesthesia in cesarean section should be minimized. The use of vasopressors is an effective measure to treat hypotension. The objective of this paper is to compare the safety and effectiveness of etilefrine vs. phenylephrine in the management of this condition. MethodsThis multicenter, double-blind trial between August 2009 and November 2010 included 196 patients with hypotension during spinal anesthesia for cesarean delivery; the patients were randomized to receive etilefrine or phenylephrine as vasopressor. The primary outcome was the fetal umbilical arterial pH. The secondary outcomes were: fetal acidosis (umbilical arterial pH<7.20), Apgar score at 1 and 5minutes, need for intubation and admission to the neonatal intensive care unit for newborns, and time of hypotension, total dose of vasopressor, atropine requirement, intravenous fluids volume and incidence of nausea and vomiting in mothers. Results98 patients received etilefrine and 98 phenylephrine. There were no differences in umbilical arterial pH (7.27 vs. 7.28, respectively, p=.493). The total dose of vasopressor (5.66 vs. 6.51ml, respectively, p=.024) and total time of hypotension (2.78 vs. 3.25min, respectively, p=.021) were lower in the etilefrine group. Other outcomes studied showed no statistically significant differences. ConclusionEtilefrine and phenylephrine are equally effective for the treatment of hypotension during spinal anesthesia for cesarean delivery. This study found no difference in the maternal or fetal outcomes.

Etilefrine vs. phenylephrine for hypotension during spinal anesthesia for cesarean section: Multicenter, randomized, double blind controlled clinical trial

IntroductionHypotension after spinal anesthesia in cesarean section should be minimized. The use of vasopressors is an effective measure to treat hypotension. The objective of this paper is to compare the safety and effectiveness of etilefrine vs. phenylephrine in the management of this condition. MethodsThis multicenter, double-blind trial between August 2009 and November 2010 included 196 patients with hypotension during spinal anesthesia for cesarean delivery; the patients were randomized to receive etilefrine or phenylephrine as vasopressor. The primary outcome was the fetal umbilical arterial pH. The secondary outcomes were: fetal acidosis (umbilical arterial pH<7.20), Apgar score at 1 and 5min, need for intubation and admission to the neonatal intensive care unit for newborns, and time of hypotension, total dose of vasopressor, atropine requirement, intravenous fluids volume and incidence of nausea and vomiting in mothers. Results98 patients received etilefrine and 98 phenylephrine. There were no differences in umbilical arterial pH (7.27 vs. 7.28, respectively, P=0.493). The total dose of vasopressor (5.66 vs. 6.51ml, respectively, P=0.024) and total time of hypotension (2.78 vs. 3.25min, respectively, P=0.021) were lower in the etilefrine group. Other outcomes studied showed no statistically significant differences. ConclusionEtilefrine and phenylephrine are equally effective for the treatment of hypotension during spinal anesthesia for cesarean delivery. This study found no difference in the maternal or fetal outcomes.

N-acetylcysteine in Acute Organophosphorus Pesticide Poisoning: A Randomized, Clinical Trial.

Organophosphorus poisoning is a major global health problem with hundreds of thousands of deaths each year. Research interest in N-acetylcysteine has grown among increasing evidence of the role of oxidative stress in organophosphorus poisoning. We aimed to assess the safety and efficacy of N-acetylcysteine as an adjuvant treatment in patients with acute organophosphorus poisoning. This was a randomized, controlled, parallel-group trial on 30 patients suffering from acute organophosphorus poisoning, who were admitted to the Poison Control Center of Tanta University Emergency Hospital, Tanta, Egypt, between April and September 2014. Interventions included oral N-acetylcysteine (600 mg three times daily for 3 days) as an added treatment to the conventional measures versus only the conventional treatment. Outcome measures included mortality, total dose of atropine administered, duration of hospitalization and the need for ICU admission and/or mechanical ventilation. A total of 46 patients were screened and 30 were randomized. No significant difference was found between both groups regarding demographic characteristics and the nature or severity of baseline clinical manifestations. No major adverse effects to N-acetylcysteine therapy were reported. Malondialdehyde significantly decreased and reduced glutathione significantly increased only in the NAC-treated patients. The patients on NAC therapy required less atropine doses than those who received only the conventional treatment; however, the length of hospital stay showed no significant difference between both groups. The study concluded that the use of N-acetylcysteine as an added treatment was apparently safe, and it reduced atropine requirements in patients with acute organophosphorus pesticide poisoning.

Effect of melatonin on duration of delirium in organophosphorus compound poisoning patients: A double-blind randomised placebo controlled trial.

Background and Aims:Organophosphate compound poisoning (OPCP) is associated with high incidence of delirium. Melatonin has been tried in the treatment of delirium and has shown a beneficial effect in OPCP. This study was conducted to know the effect of melatonin on duration of delirium and recovery profile in OPCP patients.Methods:Double-blind randomised placebo control trial in which 56 patients of OPCP confirmed by history and syndrome of OPCP with low plasma pseudocholinesterase, aged >18 years and weighing between 50 and 100 kg, and Acute Physiology and Chronic Health Evaluation II score of <20 were studied. Group M (n = 26) received tablet melatonin 3 mg and Group C (n = 30) received placebo tablet at 9 PM, every night throughout the Intensive Care Unit (ICU) stay. Delirium was assessed using the Confusion Assessment Method for ICU, thrice a day. Sedation was provided with injection midazolam, fentanyl and lorazepam. Duration of mechanical ventilation, vital parameters, ICU stay, sedative and atropine requirement, were recorded.Results:The time taken to be delirium free was significantly lower in Group M (6 ± 2.92 days) compared to Group C (9.05 ± 2.75 days) (P = 0.001) and prevalence of delirium was significantly decreased in Group M compared to Group C from day 3 onwards. The requirement of midazolam (Group M - 2.98 ± 4.99 mg/day, Group C - 9.68 ± 9.17 mg/day, P < 0.001) and fentanyl (Group M - 94.09 ± 170.05 μg/day, Group C - 189.33 ± 156.38 μg/day, P = 0.03) decreased significantly in Group M. There was no significant difference in the average atropine consumption (P = 0.27), duration of mechanical ventilation (P = 0.26), ICU stay (P = 0.21) and the number of patients requiring mechanical ventilation (P = 0.50).Conclusion:Orally given melatonin in organophosphate compound poisoning patients reduces the duration of delirium and the requirement of sedation and analgesia.

Is the World Health Organization-recommended dose of pralidoxime effective in the treatment of organophosphorus poisoning? A randomized, double-blinded and placebo-controlled trial.

Background:Organophosphorus poisoning (OPP) is a major global public health problem. Pralidoxime has been used in a complimentary role to atropine for the management of OPP. World Health Organization (WHO) recommends use of pralidoxime but studies regarding its role have been inconclusive, ranging from being ineffective to harmful or beneficial.Materials and Methods:The present study was undertaken to evaluate the effectiveness of pralidoxime. Eddleston's study was the most compelling factor for our study, as he showed worst outcomes using pralidoxime. Our practice of continuous use of pralidoxime was based on the WHO guidelines and the study by Pawar (2006), which showed better outcome with higher doses of pralidoxime. These conflicting results suggested that a re-evaluation of its use in our clinical practice was indicated.Results:There was no difference in mortality rates, hemodynamic parameters and atropine requirements between the AP and A groups. Mean duration of ventilation (3.6 ± 4.6 in AP group vs. 3.6 ± 4.4 in A group) and Intensive Care Unit stay (7.1 ± 5.4 in AP group vs. 6.8 ± 4.7 in A group) was comparable. Serum sodium concentrations showed a correlation with mortality, with lower concentrations associated with better outcomes.Conclusion:The study suggests that add-on WHO-recommended pralidoxime therapy does not provide any benefit over atropine monotherapy. Adding pralidoxime does not seem to be beneficial and at the same time does not result in increased mortality rates. Our practice changed after completion of this study, and it has proven to be of significant benefit to patients who had to bear the expense of treatment.

Efficacy of spinal additives neostigmine and magnesium sulfate on characteristics of subarachnoid block, hemodynamic stability and postoperative pain relief: A randomized clinical trial.

Background:Intrathecal neostigmine and magnesium sulfate (MgSO4) produce substantial antinociception, potentiate analgesia of bupivacaine without neurotoxicity.Aims:The aim was to investigate the effect of neostigmine and MgSO4 on characteristics of spinal anesthesia (SA), hemodynamic stability and postoperative analgesia when added to 0.5% hyperbaric bupivacaine for SA.Subjects and Methods:In this prospective, randomized, double-blind study 75 American Society of Anesthesiologist status I and II adult females posted for major gynecological surgery were assigned to one of the three groups (n = 25). Group N received Neostigmine 25 μg, Group M received MgSO4 50 mg, Group C received 0.5 ml saline as an adjuvant to 17.5 mg hyperbaric bupivacaine. Onset, duration of block, heart rate, mean arterial pressure, postoperative analgesia, analgesic requirement, and adverse effects were recorded. Data expressed as mean (standard deviation) or number (%). P <0.05 were statistically significant.Results:The three groups were comparable in characteristics of SA. The mean duration of analgesia was significantly longer in Group N (5.1 h) followed by Group M (4.2 h) and Group C (3.8 h) (P = 0.0134). Analgesic requirement was significantly less in Group N followed by Group M and Group C (P = 0.00232). The pain score was significantly less in Group M (P < 0.05). The incidence of hypotension and vasopressor requirement was lowest (48%) in Group N than in Group M (64%) and Group C 84% (P = 0.0276). The incidence of bradycardia and atropine requirement was the lowest in Group M (P = 0.0354). Sedation was observed in 56% patients in Group M compared to 20% in Group N and 8% in Group C (P = 0.0004).Conclusion:Intrathecal Neostigmine and MgSo4 does not affect characteristics of SA. Postoperative analgesia of neostigmine was better than MgSO4. Neostigmine provides some protection against hypotension of SA whereas MgSO4 protects against bradycardia.