Comparison of a Modern Digital Mechanomyograph to a Mechanomyograph Utilizing an Archival Grass Force Transducer.

BACKGROUND: Mechanomyography is the traditional gold standard research technique for quantitative assessment of neuromuscular blockade. Mechanomyography directly measures the isometric force generated by the thumb in response to ulnar nerve stimulation. Researchers must construct their own mechanomyographs since commercial instruments are no longer available. A mechanomyograph was constructed, and its performance was compared against an archival mechanomyography system from the 1970s that utilized an FT-10 Grass force transducer, hypothesizing that train-of-four ratios recorded on each device would be equivalent. METHODS: A mechanomyograph was constructed using 3D-printed components and modern electronics. An archival mechanomyography system was assembled from original components, including an FT-10 Grass force transducer. Signal digitization for computerized data collection was utilized instead of the original paper strip chart recorder. Both devices were calibrated with standard weights to demonstrate linear voltage response curves. The mechanomyographs were affixed to opposite arms of patients undergoing surgery, and the train-of-four ratio was measured during the onset and recovery from rocuronium neuromuscular blockade. RESULTS: Calibration measurements exhibited a positive linear association between voltage output and calibration weights with a linear correlation coefficient of 1.00 for both mechanomyography devices. The new mechanomyograph had better precision and measurement sensitivity than the archival system: 5.3 mV versus 15.5 mV and 1.6 mV versus 5.7 mV, respectively (P < 0.001 for both). A total of 767 pairs of train-of-four ratio measurements obtained from eight patients had positive linear association (R 2 = 0.94; P < 0.001). Bland-Altman analysis resulted in bias of 3.8% and limits of agreement of -13% and 21%. CONCLUSIONS: The new mechanomyograph resulted in similar train-of-four ratio measurements compared to an archival mechanomyography system utilizing an FT-10 Grass force transducer. These results demonstrated continuity of gold standard measurement of neuromuscular blockade spanning nearly 50 yr, despite significant changes in the instrumentation technology.

Comparation Among Opioid-Based, Low Opioid and Opioid Free Anesthesia in Colorectal Oncologic Surgery.

Introduction: Opioids are the "gold standard" for pain treatment during and after colorectal surgery. They can inhibit cellular and humoral immunity and it is assumed that can promote cancer cell proliferation and metastatic spread. Adequate pain management can be achieved not only with opioids, but also with non-opioid drugs, which can be used together in small doses, i.e., multimodal analgesia, and can lower the need for opioids during and after surgery. Opioid free anesthesia (OFA) is part of multimodal analgesia, where opioids are not used in the intraoperative period. Materials and methods: In this prospective and randomized clinical study 60 patients scheduled for open colorectal surgery were enrolled. They were between the ages of 45 and 70 with the American Association of Anesthesiologists (ASA) classifications 1, 2 and 3, divided in three groups. The first group of patients, or Opioid-based anesthesia group (OBAG), received the following for induction to anesthesia: lidocaine at 1 mg/kg, fentanyl 100 at µgr, propofol at 2mg/kg and rocuronium bromide at 0.6 mg/kg. They intermittently received 50-100 µgr fentanyl intravenously and 0.25 % bupivacaine 2-3 ml every 30-45 minutes, given in the epidural catheter during surgery. The second group of patients, or Low opioid anesthesia group (LOAG), received the following for induction to anesthesia: lidocaine at 1 mg/kg, fentanyl at 100 µgr, propofol at 2mg/kg and rocuronium bromide at 0.6 mg/kg. Prior to surgery, 50 µgr of fentanyl with 5 ml 0.25% bupivacaine was given into the epidural catheter, and the same dose was received at the end of surgery. The third group, or Opioid free anesthesia group (OFAG), received the following before the induction to general anesthesia: dexamethasone at 0.1 mg/kg and 1 gr of paracetamol. Induction to general anesthesia was with lidocaine at 1 mg/kg, propofol at 2mg/kg, ketamine at 0.5 mg/kg and rocuronium bromide at 0.6 mg/kg. After intubation, intravenous continuous infusion with lidocaine was at 2 mg/kg/h, ketamine 0.2 mg/kg/h and magnesium 15 mg/kg/h loaded on and intermittently 0.25 % bupivacaine 2-3 ml every 30-45 minutes given in the epidural catheter during surgery. The primary goal was to measure the patients' pain after the first 72 postoperative hours in all three groups (2, 6, 12, 24, 36, 48 and 72 hours after surgery). The secondary goal was to measure the total amount of morphine given in the epidural catheter in the postoperative period in all three groups. Other secondary goals were: to compare the total amount of fentanyl given intravenously during surgery in the first and second groups, determine if there was a need to use rescue analgesia in the postoperative period, measure the occurrence of PONV, and to measure the total amount of bupivacaine given in the epidural catheter during operation in all three groups. Results: Visual Analogue Scale (VAS) score comparisons between groups showed patients from the OBA and LOA groups had significantly higher VAS scores, compared to the patients from the OFA group 2, 12, 24 and 48 hours after operation. After 6 hours postoperatively, patients from the LOA group had significantly higher VAS scores, compared to patients from the OBA and OFA groups. After 36 hours postoperatively, patients from the OBA group had significantly higher VAS scores compared to patients from the LOA and OFA groups. At the last follow-up point, 72 hours after the intervention, the patients from the OBA and LOA groups had significantly higher VAS scores compared to the patients from the OFA group. All patients from the OBA and LOA groups, and only 9 from the OFA group received morphine in the postoperative period via epidural catheter. Patients from the Opioid group received significantly higher amounts of fentanyl during surgery. Additional administration of another analgesic drug in the postoperative period was prescribed in 55% of patients in the OBAG, in 50% in the LOAG and in 35% of the OFA group. PONV was registered in 60% of patients from the OBAG and in 40% of patients from the LOAG. In the OFA group did not register PONV in any of the patients. The biggest amount of bupivacaine given during surgery was in the OBAG (26.37 ± 2.6 mg), in LOAG was 25.0 ± 0 and the less in OFAG group (24.50 ± 4.3). Conclusion: Patients from OFA group, compared with patients from OBAG and LOAG, have the lowest pain score in first 72 hours after open colorectal surgery, received fewer opioids via an epidural catheter in the postoperative period, had less need for rescue analgesia, no occurrence of PONV, and less need for bupivacaine via an epidural catheter in the intraoperative period.

The efficacy and safety of an adapted opioid-free anesthesia regimen versus conventional general anesthesia in gynecological surgery for low-resource settings: a randomized pilot study.

INTRODUCTION: There is scarce data on the safety and efficacy of opioid-free anesthesia (OFA), in resource-limited settings due to the non-availability of dexmedetomidine, the reference OFA agent. We aimed to demonstrate the feasibility, efficacy and safety of a practical OFA protocol not containing dexmedetomidine, adapted for low-resource environments in very painful surgeries like gynecological surgery. METHODS: We conducted a randomized pilot study on ASA I and II women undergoing elective gynecological surgery at a tertiary care hospital in Cameroon. Patients were matched in a ratio of 1:1 into an OFA and a conventional general anesthesia (CGA) group. The OFA protocol entailed the intravenous (IV) magnesium sulfate, lidocaine, ketamine, dexamethasone, propofol, and rocuronium, followed by isoflurane and a continuous infusion of a calibrated mixture of magnesium sulfate, ketamine and clonidine. The CGA protocol was IV dexamethasone, diazepam, fentanyl, propofol, and rocuronium, followed by isoflurane and reinjections of fentanyl propofol and a continuous infusion of normal saline as placebo. The primary endpoints were the success rate of OFA, isoflurane consumption and intraoperative anesthetic complications. The secondary endpoints were postoperative pain intensity, postoperative complications, patient satisfaction assessed using the QoR-40 questionnaire and the financial cost of anesthesia. RESULTS: We enrolled a total of 36 women undergoing gynecological surgery; 18 in the OFA group and 18 in the CGA group. The success rate of OFA was 100% with significant lesser consumption of isoflurane in the OFA group, no significant intraoperative complication and better intraoperative hemodynamic stability in the OFA group. Postoperatively, compared to the CGA group, the OFA group had statistically significantly less pain during the first 24 h, no morphine consumption for pain relief, had less hypoxemia during the first six hours, less paralytic ileus, less nausea and vomiting, no pruritus and better satisfaction. The mean financial cost of this adapted OFA protocol was statistically significant lesser than that of CGA. CONCLUSION: This OFA regimen without dexmedetomidine for a low-resource setting has a promising success rate with few perioperative complications including mild intraoperative hemodynamic changes, decrease postoperative complications, pain, and opioid consumption in patients undergoing elective gynecology surgery. TRIAL REGISTRATION: This study was registered at clinicaltrials.gov on 03/02/2021 under the registration number NCT04737473.

Postoperative Serotonin Syndrome Following Methylene Blue Administration for Vasoplegia After Cardiac Surgery: A Case Report and Review of the Literature.

Serotonin syndrome is a potentially life-threatening condition associated with increased serotonergic activity in the central nervous system. The increasing incidence of this condition is thought to parallel the increasing use of serotonergic agents in medical practice. The selective serotonin reuptake inhibitors are perhaps the most commonly implicated group of medications associated with serotonin syndrome. This case report describes the occurrence of postoperative serotonin syndrome in a patient on long-term sertraline who underwent coronary artery bypass graft and was treated with methylene blue for perioperative vasoplegia. It delineates the various clinical features commonly encountered and illustrates the recommended management modalities, including prevention, for this potentially lethal medical emergency. With prompt diagnosis and expeditious treatment, the patient has had full recovery.

Early Skin Test after Anaphylaxis during Induction of Anesthesia: A Case Report.

BACKGROUND: It is recommended that a skin test be performed 4-6 weeks after anaphylaxis. However, there is little evidence about the timing of the skin test when there is a need to identify the cause within 4-6 weeks. CASE REPORT: A 57-year-old woman was scheduled to undergo surgery via a sphenoidal approach to remove a pituitary macroadenoma. Immediately after the administration of rocuronium, pulse rate increased to 120 beats/min and blood pressure dropped to 77/36 mmHg. At the same time, generalized urticaria and tongue edema were observed. Epinephrine was administered and the surgery was postponed. Reoperation was planned two weeks after the event. Four days after the anaphylactic episode, rocuronium was confirmed to be the cause by the skin prick test. Cisatracurium, which showed a negative reaction, was selected as an alternative agent for future procedures. Two weeks later, the patient underwent reoperation without any adverse events. CONCLUSIONS: The early skin test can be performed if there is a need even earlier than 4-6 weeks after anaphylaxis.

Mediastinal tumor resection in a patient with spinocerebellar degeneration.

BACKGROUND: In spinocerebellar degeneration (SCD) patients, general and regional anesthesia may cause postoperative dysfunction of respiratory, nerve and muscle systems. We present the surgical case of thymoma developed in patient with SCD. CASE PRESENTATION: A 47-year-old woman with spinocerebellar degeneration was admitted because of a well-defined mass measuring 48 × 31 mm in anterior mediastinum. She showed limb, truncal, ocular, and speech ataxia; hypotonia; areflexia; sensory disturbances; and muscle weakness. Her eastern cooperative oncology group performance status was 4. Surgical resection was performed via video-assisted thoracic surgery and under general anesthesia only without epidural analgesia. The mass was diagnosed as type B1 thymoma without capsular invasion (Masaoka stage I). The patients got a good postoperative course by cooperation with anesthesiologists and neurologists in perioperative managements. She has been well over 3 years of follow-up. CONCLUSIONS: In conclusion, careful surgical and anesthesia management is essential for providing an uneventful postoperative course in patients with SCD. Especially, selection of minimal invasive approach and avoid diaphragmatic nerve damage are the most important points in surgical procedures.

[Influence of methylprednisolone on the reversal time of sugammadex: a randomized clinical trial]. / Influência da metilprednisolona no tempo de reversão do sugammadex: estudo clínico randomizado.

BACKGROUND AND OBJECTIVES: Sugammadex is a modified gamma-cyclodextrin that reverses the effects of aminosteroidal neuromuscular blocking agents. Likewise, some steroid molecules, such as toremifene, fusidic acid, and flucloxacillin, can also be encapsulated by sugammadex. Methylprednisolone, which is a synthetic steroid used commonly for airway oedema prophylaxis, can also be encapsulated by sugammadex. The objective of this study was to compare the recovery times of sugammadex for reversing rocuronium-induced moderate neuromuscular blockade in those who received intraoperative 1 mg.kg-1 methylprednisolone or saline. METHOD: This single-centered, randomized, controlled, prospective study included 162 adult patients undergoing elective ear-nose-throat procedures (aged from 18-65, an ASA physical status I-II, a BMI less than 30 kg.m-2, and not taking steroid drug medication) with propofol, remifentanyl, rocuronium and sevoflurane. Neuromuscular monitoring was performed using calibrated acceleromyography. The Control Group (Group C) received 5 mL of saline, while the Methylprednisolone Group (Group M) received 1 mg.kg-1 of methylprednisolone in 5mL of saline just after induction. After the completion of surgery, regarding the TOF count, two reappeared spontaneously and 2 mg.kg-1 sugammadex was administered to all patients. Recovery of the TOF ratio to 0.9 was recorded for both groups, and the estimated recovery time to reach a TOF ratio (TOFr) of 0.9 was the primary outcome of the study. RESULTS: Median time to TOFr = 0.9 was for 130.00 s (range of 29-330) for Group C and 181.00 s (100-420) for Group M (p < 0.001). The differences between the two groups were statistically significant. CONCLUSION: When using 2 mg.kg-1 of sugammadex to reverse rocuronium-induced neuromuscular blockade in patients who received 1 mg.kg-1 of intraoperative methylprednisolone, demonstrated delayed recovery times.

A Prospective, Randomized Trial Comparing Respiratory Status During Anesthesia for Airway Stenting: Spontaneous Respiration Versus Controlled Ventilation With Muscle Relaxants.

BACKGROUND: Airway stenting is a procedure in which a stent is inserted into a stenotic site of the airway. The safest method of ventilation for airway stenting is controversial. A prospective randomized interventional study was conducted on airway stenting. We conducted this study to investigate whether controlled ventilation with muscle relaxants (MR) during airway stenting reduces the incidence of desaturation events (percutaneous oxygen saturation [SpO2] <95%) in comparison with spontaneous respiration (SP). METHODS: Sixty-four patients were enrolled at our hospital between April 2016 and August 2018, and were randomly assigned to the controlled ventilation with MR group or SP group. For anesthesia, total intravenous anesthesia with propofol target-controlled infusion and remifentanil was performed. In the SP group, SP was maintained. In the MR group, a rigid bronchoscope was inserted after the administration of MR to perform controlled ventilation. The incidence of desaturation events was analyzed by logistic regression adjusted by the preoperative respiratory state and stenotic site of the airway. RESULTS: The incidence of desaturation events in the SP and MR groups was 75.0% (24/32) and 9.7% (3/31), respectively, with an odds ratio of 0.04 (95% confidence interval, 0.01-0.16, reference = SP group; P < .001). In the SP group, the mean intraoperative pH was lower than that in the MR group (7.2 ± 0.1 vs 7.4 ± 0.1, respectively; P < .001). In this group, the mean partial pressure of arterial carbon dioxide (PaCO2) was higher (70.2 ± 17.0 mm Hg vs 40.5 ± 8.0 mm Hg, respectively; P < .001) and the mean partial pressure of oxygen in the arterial blood/fraction of the inspiratory oxygen ratio was lower (263.1 ± 64.2 mm Hg vs 396.4 ± 69.4 mm Hg, respectively; P < .001). CONCLUSIONS: Controlled ventilation with MR during airway stenting reduced the incidence of desaturation events, maintaining a favorable respiratory status.

Magnesium sulfate reduces the rocuronium dose needed for satisfactory double lumen tube placement conditions in patients with myasthenia gravis.

BACKGROUND: Using a minimum dose of neuromuscular blockade (NMB) to achieve intubation condition is one of the goals in anaesthesia management of patients with myasthenia gravis (MG) for thoracoscopic (VATS) thymectomy. However, tracheal intubation with double lumen tube (DLT) could be challenging if intubation condition is not optimal. This double-blind randomised controlled study was designed to investigate whether magnesium sulfate would reduce the rocuronium dose needed for DLT intubation and improve the DLT placement condition for patients with MG who were scheduled for video-assisted thoracoscopic (VATS) thymectomy. METHODS: Recruited patients were randomly assigned to receive magnesium sulfate 60 mg.kg- 1 or normal saline (control) prior to the administration of NMB. Titrating dose of rocuronium was administered to achieve train of four (TOF) ratio less than 10% before DLT intubation. The primary outcome was the rocuronium dose required to achieve TOF ratio less than 10%. The secondary outcome was intubation condition for DLT placement. RESULTS: Twenty-three patients had received magnesium sulfate and 22 patients had received normal saline before rocuronium administration. The required rocuronium dose [mean (standard deviation)] were 0.10 (0.05) mg.kg- 1 and 0.28(0.17) mg.kg- 1 in patients who had magnesium sulfate and normal saline respectively(P < 0.0001). With a similar depth of neuromuscular blockade and depth of anaesthesia, 100% of patients in the magnesium sulfate group and 72.7% of patients in the control group showed excellent intubation condition (P = 0.027) respectively. The patients in both groups had similar emergence characteristics. CONCLUSIONS: Magnesium sulfate is associated with a decrease in rocuronium requirement for an optimal DLT intubation condition in patients with MG for VATS thymectomy. TRIAL REGISTRATION: Clinical Trial Registry of China ( http://www.chictr.org.cn ) identifier: ChiCTR-1800017696, retrospectively registered on August 10, 2018.

Failure of reversion of neuromuscular block with sugammadex in patient with myasthenia gravis: case report and brief review of literature.

BACKGROUND: Myasthenia gravis (MG) is a challenge for anesthesia management. This report shows that the use of rocuronium-sugammadex is not free from flaws and highlights the importance of cholinesterase inhibitors management and neuromuscular block monitoring in the perioperative period of myasthenic patients. CASE PRESENTATION: Myasthenic female patient submitted to general balanced anesthesia using 25 mg of rocuronium. Under train-of-four (TOF) monitoring, repeated doses of sugammadex was used in a total of 800 mg without recovery of neuromuscular blockade, but TOF ratio (TOFR) was stabilized at 60%. Neostigmine administration led to the improvement of TOFR. CONCLUSIONS: Although the use of rocuronium-sugammadex seems safe, we should consider their unpredictability in myasthenic patients. This report supports the monitoring of neuromuscular blockade as mandatory in every patient, especially the myasthenic ones.

Sugammadex: Efficacy and Practicality in the Dental Office.

Sugammadex is a novel drug capable of reversing paralysis induced by the common steroidal nondepolarizing neuromuscular blocking drugs, rocuronium and vecuronium. Reversal is complete at any depth of blockade dependent on the dose of sugammadex administered. This allows rocuronium to be used as a rescue agent in scenarios where succinylcholine is contraindicated. Sugammadex is considered a safe drug with minimal side effects compared with traditional reversal with neostigmine and glycopyrrolate. This article features a case report where succinylcholine was undesirable and rapid reversal of paralysis with sugammadex was used during general anesthesia for dentistry.

Lower intra-abdominal pressure has no cardiopulmonary benefits during laparoscopic colorectal surgery: a double-blind, randomized controlled trial.

BACKGROUND: Higher intra-abdominal pressure may impair cardiopulmonary functions during laparoscopic surgery. While 12-15 mmHg is generally recommended as a standard pressure, the benefits of lower intra-abdominal pressure are unclear. We thus studied whether the low intra-abdominal pressure compared with the standard pressure improves cardiopulmonary dynamics during laparoscopic surgery. METHODS: Patients were randomized according to the intra-abdominal pressure and neuromuscular blocking levels during laparoscopic colorectal surgery: low pressure (8 mmHg) with deep-block (post-tetanic count 1-2), standard pressure (12 mmHg) with deep-block, and standard pressure with moderate-block (train-of-four count 1-2) groups. During the laparoscopic procedure, we recorded cardiopulmonary variables including cardiac index, pulmonary compliance, and surgical conditions. We also assessed postoperative pain intensity and recovery time of bowel movement. The primary outcome was the cardiac index 30 min after onset of laparoscopy. RESULTS: Patients were included in the low pressure with deep-block (n = 44), standard pressure with deep-block (n = 44), and standard pressure with moderate-block (n = 43) groups. The mean (SD) of cardiac index 30 min after laparoscopy was 2.7 (0.7), 2.7 (0.9), and 2.6 (1.0) L min-1 m-2 in each group (P = 0.715). The pulmonary compliance was higher but the surgical condition was poorer in the low intra-abdominal pressure than the standard pressure (both P < 0.001). Other variables were comparable between groups. CONCLUSION: We observed few cardiopulmonary benefits but poor surgical conditions in the low intra-abdominal pressure during laparoscopy. Considering cardiopulmonary dynamics and surgical conditions, the standard intra-abdominal pressure may be preferable to the low pressure for laparoscopic surgery.

[Certain and controversial components of "rapid sequence induction"]. / Sichere und kontroverse Komponenten der "rapid sequence induction".

Rapid sequence induction (RSI) is a specific technique for anesthesia induction, which is performed in patients with an increased risk for pulmonary aspiration (e.g. intestinal obstruction, severe injuries and cesarean section). The incidence of acute respiratory distress syndrome (ARDS) is very low but 10-30% of anesthesia-related deaths are caused by the consequences of ARDS. The classical RSI with its main components (i.e. head-up position, avoidance of positive pressure ventilation and administration of succinylcholine) was published nearly 50 years ago and has remained almost unchanged. The modified RSI consists of mask ventilation before endotracheal intubation is performed or the use of non-depolarizing muscle relaxants. Succinylcholine 1.0 mg/kg or rocuronium 1.0-1.2 mg/kg should be administered to achieve excellent intubation conditions. The use of cricoid pressure was a cornerstone of RSI after its introduction in 1961; however, after controversial discussions in recent years, cricoid pressure has lost its importance. Before surgery gastric emptying with a nasogastric tube is mandatory in patients with ileus and passage or defecation disorders.

Complicación respiratoria en el postoperatorio tardío en un paciente con distrofia miotónica tipo I. Reporte de un caso / Respiratory complication in the late postoperative period in a patient with type I myotonic dystrophy. Case report

Myotonic dystrophy is an uncommon disease, characterised by disorders of the muscle membrane. Its clinical manifestations are muscle weakness, difficulty at initiating movements and delayed muscle relaxation. Carriers of this disease are very sensitive to anaesthetic drugs. Residual neuromuscular blockade is common among these patients, leaving them at risk of various postoperative complications. Proper neuromuscular blockade reversal is therefore crucial. We report the case of an 18-year-old male with myotonic dystrophy type I (Steinert's disease), who was admitted for a complicated hydatid cyst. He required a laparotomy, which was done under general anesthesia with no intraoperative incidents. He was extubated at the end of the procedure, with 94% response at the train-of-four (TOF) and adequate spontaneous ventilation. No reversal for neuromuscular blockade was given. The patient evolved favourably during the postoperative phase. However, in the later postoperatory period the patient presented severe respiratory complications. Proper anaesthetic management of these patients, as described in the literature, includes the use of non-depolarising muscle relaxants, monitoring of muscle relaxation and reversal of neuromuscular blockade. The combination of rocuronium and sugammadex appears to convey the optimum reversal required for these cases.

Las distrofias miotónicas son enfermedades poco comunes, caracterizadas por trastornos a nivel de la membrana muscular. Clínicamente se manifiestan por debilidad muscular progresiva, dificultad al iniciar movimientos y retardo en la relajación muscular. Los portadores de este grupo de enfermedades tienen una marcada sensibilidad a los fármacos anestésicos. Es habitual que presenten bloqueo neuromuscular residual, arriesgándose a sufrir diversas complicaciones postoperatorias. Por ello, es importante realizar una reversión adecuada de la relajación muscular en estos pacientes. Presentamos el caso de un paciente masculino de 18 años, con distrofia miotónica de Steinert tipo I, que ingresa para laparotomía por quiste hidatídico hepático complicado. Recibió anestesia general sin incidentes. Es extubado con una respuesta al tren-de-cuatro (TOF) de 94% y ventilación espontánea adecuada. No se realiza reversión del bloqueo neuromuscular y evoluciona favorablemente en el postoperatorio inmediato. Sin embargo, en el período postoperatorio tardío, presenta complicaciones respiratorias severas. El adecuado manejo de estos pacientes, según lo recomendado en la literatura, requiere el uso de relajantes no-depolarizantes, monitorización y reversión del bloqueo neuromuscular, siendo probablemente la combinación de rocuronio y sugammadex, la más adecuada para estos fines.

Use of protocol and evaluation of postoperative residual curarization incidence in the absence of intraoperative acceleromyography - Randomized clinical trial / Aplicação de protocolo e avaliação da incidência de curarização residual pós-operatória na ausência de aceleromiografia intraoperatória - Ensaio clínico randomizado

Abstract Objective Evaluate the incidence of postoperative residual curarization (PORC) in the post-anesthesia care unit (PACU) after the use of protocol and absence of intraoperative acceleromyography (AMG). Methods Randomized clinical trial with 122 patients allocated into two groups (protocol and control). Protocol group received initial and additional doses of rocuronium (0.6 mg·kg-1 and 10 mg, respectively); the use of rocuronium was avoided in the final 45 min; blockade reversal with neostigmine (50 µg·kg-1); time ≥15 min between reversion and extubation. Control: initial and additional doses of rocuronium, blockade reversal, neostigmine dose, and extubation time, all at the discretion of the anesthesiologist. AMG was used in the PACU and PORC considered at T4/T1 ratio <1.0. Results The incidence of PORC was lower in protocol group than in control group (25% vs. 45.2%, p = 0.02). In control group, total dose of rocuronium was higher in patients with PORC than without PORC (0.43 vs. 0.35 mg·kg-1·h-1, p = 0.03) and the time interval between the last administration of rocuronium and neostigmine was lower (75.0 vs. 101.0 min, p < 0.01). In protocol group, there was no difference regarding the analyzed parameters (with PORC vs. without PORC). Considering the entire study population and the presence or absence of PORC, total dose of rocuronium was higher in patients with PORC (0.42 vs. 0.31 mg·kg-1·h-1, p = 0.01), while the time interval between the last administration of rocuronium and neostigmine was lower (72.5 vs. 99.0 min, p ≤ 0.01). Conclusion The proposed systematization reduced PORC incidence in PACU in the absence of intraoperative AMG.

Resumo Objetivo Avaliou-se a incidência de curarização residual pós-operatória (CRPO) na sala de recuperação pós-anestésica (SRPA) após emprego de protocolo e ausência de aceleromiografia (AMG) intraoperatória. Métodos Ensaio clínico, aleatório, com 122 pacientes, distribuídas em dois grupos: protocolo e controle. Protocolo: dose inicial e adicionais de rocurônio foram de 0,6 mg.kg-1 e 10 mg, respectivamente; evitou-se o uso de rocurônio nos 45 minutos finais; reversão do bloqueio com neostigmina (50 µg.kg-1); tempo ≥ 15 minutos entre reversão e extubação. Controle: doses inicial e adicional de rocurônio, reversão do bloqueio, dose de neostigmina e momento da extubação decididos pelo anestesiologista. Foi usada AMG na SRPA e considerado CRPO razão T4/T1 < 1,0. Resultados A incidência de CRPO foi menor no grupo protocolo em relação ao controle (25% vs. 45,2%; p = 0,02). No grupo controle, a dose total de rocurônio foi maior em pacientes com CRPO em relação àqueles sem CRPO (0,43 vs. 0,35 mg.kg-1.h-1; p = 0,03) e o intervalo entre a última administração de rocurônio e a neostigmina foi menor (75,0 vs. 101,0 min; p < 0,01). No grupo protocolo não houve diferença dos parâmetros analisados (com CRPO vs. sem CRPO). Considerando toda a população de estudo e a presença ou não de CRPO, a dose total de rocurônio foi maior em pacientes com CRPO (0,42 vs. 0,31 mg.kg-1.h-1; p = 0,01), enquanto o intervalo entre a última administração de rocurônio e a neostigmina foi menor (72,5 vs. 99,0 min; p ≤ 0,01). Conclusão A sistematização proposta reduziu a incidência de CRPO na SRPA na ausência de AMG intraoperatória.

The effect of bariatric anaesthesia on postoperative pulmonary functions.

OBJECTIVE: To evaluate respiratory function in the post-operative early period of patients undergoing bariatric surgery using the sleeve gastrectomy technique. METHODS: This prospective, observational study was conducted at Bülent Ecevit University Health Application and Research Centre, Zonguldak, Turkey from June to December 2014, and comprised patients with planned bariatric sleeve gastrectomy under general anaesthesia. Participants were visited 12-24 hours before the operation to record accompanying diseases and demographic data. Before the operations, respiratory function test, maximum expiratory pressure, maximum inspiratory pressure and arterial blood gas assessment tests were done and recorded as T0. After one hour of the operation, Aldrete scores >9 and the above-mentioned tests were repeated and recorded as T1. SPSS 18 and MedCalc 12.2.1.0 were used for statistical analysis. RESULTS: Of the 76 participants, 60(78%) were women and 16(21%) were men. The overall median age was 39 years (inter-quartile range: 32-47 years). The mean and median values for forced expiratory volume in 1 second, forced vital capacity, maximum inspiratory pressure, maximum expiratory pressure and the ratio between partial pressure of oxygen in arterial blood and fraction of inspired oxygen at T0 were 101±17, 102±17, 66 (interquartile range: 59-74), 114 (interquartile range: 100-138) and 379±49, respectively, compared with 78±18, 76±18, 53 (interquartile range: 48-59), 85 (interquartile range: 73-95) and 331±49at T1 (p<0.001 each). Also, 38(50%) participants were given sugammadex and 38(50%) were given neostigmine. At the end of the test, sugammadex (odds ratio: 5.80; 95% confidence interval: 1.26-26.69; p=0.024) and pre-operative ratio between partial pressure of oxygen in arterial blood and fraction of inspired oxygen (odds ratio: 1.04, 95% confidence interval: 1.02-1.06; p<0.0001) were found to correlate significantly. CONCLUSIONS: Impairment of respiratory function was found during the early post-operative period.

Comparison of three different doses sugammadex based on ideal body weight for reversal of moderate rocuronium-induced neuromuscular blockade in laparoscopic bariatric surgery.

BACKGROUND: The majority of authors and the literature recommend sugammadex dose to be calculated according to RBW without taking fat content into consideration. Our aim was to compare the efficacy and safety of sugammadex at doses of 1.5, 2, and 4 mg/kg, calculated according to ideal body weight basis, for the reversal of moderate rocuronium-induced neuromuscular blockade in laparoscopic bariatric surgery. METHODS: One-hundred and eighty morbidly obese patients were randomly assigned into three groups according to sugammadex dose administrated (based on IBW after reaching T2 of TOF): Group I: patients were given 1.5 mg/kg. Group II: patients were given 2 mg/kg. Group III: patients were given 4 mg/kg. Both sugammadex and extubation times were recorded. RESULTS: Sugammadex time was significantly longer in groups I and II versus III (P=0.000, 0.005 respectively). Difference between groups I and II was insignificant. The extubation time was insignificantly different in the three groups (P>0.05). CONCLUSIONS: A dose of sugammadex of 1.5 mg/kg calculated according to IBW successfully reversed moderate rocuronium-induced NMB in laparoscopic bariatric surgeries.