BACKGROUND:Sugammadex is not advised for patients with severe renal impairment, but has been shown in a variety of other populations to be superior to neostigmine for reversal of neuromuscular blockade. The objective of this study was to determine if reversal of rocuronium-induced neuromuscular blockade with sugammadex versus reversal of cisatracurium-induced neuromuscular blockade with neostigmine results in a faster return to a train-of-four ratio (TOFR) ≥90% in patients with severe renal impairment. METHODS:We conducted a prospective, randomized, blinded, controlled trial at a large county hospital. A total of 49 patients were enrolled. Inclusion criteria included patients age ≥18, American Society of Anesthesiologists (ASA) physical status III and IV, with a creatinine clearance <30 mL/min, undergoing general anesthesia with expected surgical duration ≥2 hours and necessitating neuromuscular blockade. Subjects received either cisatracurium 0.2 mg/kg or rocuronium 0.6 mg/kg for induction of anesthesia to facilitate tracheal intubation. Subjects were kept at moderate neuromuscular blockade during surgery and received either 2 mg/kg sugammadex or 50 µg/kg neostigmine with 10 µg/kg glycopyrrolate for reversal of neuromuscular blockade. Neuromuscular monitoring was performed with electromyography (TwitchView), and the TOFR was recorded every minute after administration of the reversal agent. The time from administration of neuromuscular reversal until the patient reached a TOFR ≥90% was recorded as the primary outcome. RESULTS:The mean time to recovery of TOFR ≥90% was significantly faster with sugammadex at 3.5 (±1.6) min compared with neostigmine at 14.8 (±6.1) min ( P < .0001; mean difference, 11.3 minutes; 95% confidence interval [CI], 9.0-13.5 minutes). There were no major adverse events in either group. CONCLUSIONS:In patients with severe renal impairment, neuromuscular blockade with rocuronium followed by reversal with sugammadex provides a significantly faster return of neuromuscular function compared to cisatracurium and neostigmine, without any major adverse effects.

BACKGROUND:Cocaine has a short biological half-life, but inactive urine metabolites may be detectable for a week following use. It is unclear if patients who test positive for cocaine but have a normal electrocardiogram and vital signs have a greater percentage of hemodynamic events intraoperatively. METHODS:A total of 328 patients with a history of cocaine use who were scheduled for elective noncardiac surgery under general anesthesia were enrolled. Patients were categorized into cocaine-positive versus cocaine-negative groups based on the results of their urine cocaine toxicology test. The primary aim of this study was to evaluate whether asymptomatic cocaine-positive patients had similar percentages of intraoperative hemodynamic events, defined as (1) a mean arterial blood pressure (MAP) of <65 or >105 mm Hg and (2) a heart rate (HR) of <50 or >100 beats per minute (bpm) compared to cocaine-negative patients. The study was powered to assess if the 2 groups had an equivalent mean percent of intraoperative hemodynamic events within specific limits using an equivalence test of means consisting of 2 one-sided tests. RESULTS:The cocaine-positive group had a blood pressure (BP) that was outside the set limits 19.4% (standard deviation [SD] 17.7%) of the time versus 23.1% (SD 17.7%) in the cocaine-negative group (95% confidence interval [CI], 0.5-7.0). The cocaine-positive group had a HR outside the set limits 9.6% (SD 16.2%) of the time versus 8.2% (SD 14.9%) in the cocaine-negative group (95% CI, 4.3-1.5). Adjusted for age, sex, body mass index (BMI), smoking status, and the presence of comorbid hypertension, renal disease, and psychiatric illness, the cocaine-positive and cocaine-negative patients were similar within a 7.5% margin of equivalence for MAP data (β coefficient = 2%, P = .003, CI, 2-6) and within a 5% margin of equivalence for HR data (β coefficient = 0.2%, P < .001, CI, 4-3). CONCLUSIONS:Asymptomatic cocaine-positive patients undergoing elective noncardiac surgery under general anesthesia have similar percentages of intraoperative hemodynamic events compared to cocaine-negative patients.

INTRODUCTION:Based upon the Third National Health and Nutrition Examination Survey data, iron deficiency anemia is the cause of at least 20% of cases of anemia in adults over the age of 65. This is especially relevant in patients undergoing major orthopedic surgery as substantial perioperative blood loss is possible, leading to a high rate of allogeneic blood transfusion in total hip replacements, total knee replacements, and hip fracture repairs.SIGNIFICANCE:The results of this systematic review may be of interest to clinicians and hospital administrators evaluating the clinical efficacy and cost effectiveness of intravenous (IV) iron administration prior to major orthopedic surgery.MATERIALS AND METHODS:The original studies considered for this review included patients who were over 18 years of age, undergoing major orthopedic surgery, and who received an IV iron treatment in the preoperative setting. A total of 1083 articles were identified and reviewed. After removing duplicates, 1031 publications were screened, and 105 full-text studies were assessed for eligibility. A total of 98 were excluded and 7 articles remained which met the criteria for this review. The primary outcome examined in the included studies was the allogeneic blood transfusion rate. The secondary areas of interest were changes in serum hemoglobin, morbidity and mortality, length of stay, and cost effectiveness.RESULTS:This systematic review found little evidence that IV iron therapy is effective at reducing transfusion in patients undergoing major orthopedic surgery.CONCLUSIONS:We do not recommend preoperative IV iron therapy for all patients scheduled for major orthopedic surgery.

Background Double lumen endotracheal tubes (DLT) are commonly used to provide single lung ventilation during thoracic surgery. A fiberoptic bronchoscope (FOB) is typically used to confirm accurate DLT placement. Accounting for initial purchase, maintenance, repair and cleaning, the use of an FOB can cost as much as $312 per procedure. The VivaSight DLT (VS-DLT) incorporates a built-in camera, which is aimed at reducing FOB use and its associated costs. In this study, we compared the rate of FOB use when intubating using either a VS-DLT or a conventional DLT (c-DLT). Methods This is a randomized controlled comparative study performed at a public county teaching hospital. A total of 50 patients were enrolled and randomly assigned to either a c-DLT (n=25) or a VS-DLT (n=25). The primary outcome was the rate of FOB use. Secondary outcomes included time to correct tube placement and incidence of malposition during surgery. Results Use of the VS-DLT required significantly less FOB use (28%) compared to use of the c-DLT (100%). While there was no difference in the ease of intubation, the time to correct tube placement was significantly faster using a VS-DLT (54 vs. 156 s, P<0.001). Additionally, the incidence of tube malposition was significantly reduced in the VS-DLT group. Conclusions This study demonstrated a significantly lower rate of FOB use when using a VS-DLT compared to a c-DLT. Placement of the VS-DLT was significantly quicker and malposition during surgery occurred significantly less than with the c-DLT. While intubating with a VS-DLT provides clinical benefits, it may not result in significant cost reductions when compared to a c-DLT.

With the increasing prevalence of obesity worldwide, it is inevitable that anesthesiologists will encounter patients with metabolic syndrome. Metabolic syndrome encompasses multiple diseases, which include central obesity, hypertension, dyslipidemia, and hyperglycemia. Given the involvement of multiple diseases, metabolic syndrome involves numerous complex pathophysiological processes that negatively impact several organ systems. Some of the organ systems that have been well-documented to be adversely affected include the cardiovascular, pulmonary, and endocrine systems. Metabolic syndrome also leads to prolonged hospital stays, increased rates of infections, a greater need for care after discharge, and overall increased healthcare costs. Several interventions have been suggested to mitigate these negative outcomes ranging from lifestyle modifications to surgeries. Therefore, anesthesiologists should understand metabolic syndrome and formulate management strategies that may modify perianesthetic and surgical risks.

Introduction: Based upon the Third National Health and Nutrition Examination Survey data, iron deficiency anemia is the cause of at least 20% of cases of anemia in adults over the age of 65. This is especially relevant in patients undergoing major orthopedic surgery as substantial perioperative blood loss is possible, leading to a high rate of allogeneic blood transfusion in total hip replacements, total knee replacements, and hip fracture repairs. Significance: The results of this systematic review may be of interest to clinicians and hospital administrators evaluating the clinical efficacy and cost effectiveness of intravenous (IV) iron administration prior to major orthopedic surgery. Materials and Methods: The original studies considered for this review included patients who were over 18 years of age, undergoing major orthopedic surgery, and who received an IV iron treatment in the preoperative setting. A total of 1083 articles were identified and reviewed. After removing duplicates, 1031 publications were screened, and 105 full-text studies were assessed for eligibility. A total of 98 were excluded and 7 articles remained which met the criteria for this review. The primary outcome examined in the included studies was the allogeneic blood transfusion rate. The secondary areas of interest were changes in serum hemoglobin, morbidity and mortality, length of stay, and cost effectiveness. Results: This systematic review found little evidence that IV iron therapy is effective at reducing transfusion in patients undergoing major orthopedic surgery. Conclusions: We do not recommend preoperative IV iron therapy for all patients scheduled for major orthopedic surgery. Keywords preoperative , anemia , iron deficiency anemia , intravenous iron , orthopedic surgery , hemoglobin

Study objective: This objective of this study was to determine if reversal of rocuronium-induced neuromuscular blockade with sugammadex versus neostigmine results in a decreased number of hypoxic episodes in the early postoperative period in patients undergoing thoracic surgery with single lung ventilation. Design: Single-center, randomized, double-blind, two-arm clinical trial. Setting: Operating room and postanesthesia care unit. Patients: 92 subjects aged >= 18, American Society of Anesthesiologists physical status II-IV, and undergoing a thoracic operation necessitating single lung ventilation. Interventions: Subjects received either 2 mg/kg sugammadex or 50 mu g/kg neostigmine with 8 mu g/kg glycopyrrolate for reversal of moderate neuromuscular blockade. Measurements: For the first 90 min postoperatively, all episodes of hypoxia were recorded. Neuromuscular monitoring was performed with acceleromyography (TOF-Watch (R) SX) and the train of four (TOF) was recorded at 2, 5, 10, and 15 min after administration of the neuromuscular reversal agent. Main results: Subjects who received neostigmine had a median of 1 episode (interquartile range IQR: 0-2.2) of hypoxia versus subjects who received sugammadex who had a median of 0 episodes (IQR: 0-1) (p = 0.009). The mean time to recovery of TOF >= 0.9 was significantly faster with sugammadex at 10 min (95% confidence interval CI: 5-15) compared with neostigmine at 40 min (95% CI: 15-53) (p < 0.001). Conclusions: In thoracic surgical patients necessitating single lung ventilation, sugammadex provides faster reversal of moderate neuromuscular blockade and results in a decreased number of postoperative hypoxic episodes compared with neostigmine.

PurposeTo determine the influence of morbid obesity on the incidence of difficult mask ventilation and difficult intubation.MethodsOver a 6-year period, all tracheal intubations in the operating room of a large tertiary teaching hospital were analyzed. A modified version of the intubation difficulty scale (mIDS) was used to define easy versus difficult intubation, where a score of two or greater was defined as difficult intubation. Difficult mask ventilation was defined as the use of one or more adjuncts to achieve successful mask ventilation.ResultsOf 45,447 analyzed cases, 1893 (4.2%) were classified as difficult intubations. Morbidly obese patients were not more likely to have difficult intubation [Odds Ratio (OR)=1.131, 95% confidence interval (CI): 0.958, 1.334, p=0.146]. Factors that were associated with difficult intubation included patient age>46 years, male sex, Mallampati 3-4, thyromental distance<6cm, and the presence of intact dentition. Of 37,016 cases in which mask ventilation was attempted, 1069 (2.9%) were difficult. Morbidly obese patients were more likely to have difficult mask ventilation (OR=3.785, 95% CI: 3.188, 4.493, p<0.0001). Other factors associated with difficult mask ventilation included patient age>46 years, male sex, Mallampati 3-4, and a history of obstructive sleep apnea. Having intact dentition decreased the likelihood of difficult mask ventilation.ConclusionMorbidly obese patients do not have a higher incidence of difficult intubation compared to non-morbidly obese patients. However, they have a significantly higher incidence of difficult mask ventilation. Other factors that are predictive of both difficult mask ventilation and difficult intubation include age>46 years, male sex, and Mallampati 3-4.

Background Obese patients have a propensity to desaturate during induction of general anesthesia secondary to their reduced functional residual capacity and increased oxygen consumption. Apneic oxygenation can provide supplemental oxygen to the alveoli, even in the absence of ventilation, during attempts to secure the airway. In this study, we hypothesized that oxygen administration through a nasopharyngeal airway and standard nasal cannula during a simulated prolonged laryngoscopy would significantly prolong the safe apneic duration in obese patients. Methods One hundred thirty-five obese patients undergoing non-emergent surgery requiring general anesthesia were randomized to either the control group or to receive apneic oxygenation with air versus oxygen. All patients underwent a standard intravenous induction. For patients randomized to receive apneic oxygenation, a nasopharyngeal airway and standard nasal cannula were inserted. A simulated prolonged laryngoscopy was performed to determine the duration of the safe apneic period, defined as the beginning of laryngoscopy until the peripheral oxygen saturation (SpO(2)) reached 95%. Results The oxygen group had a median safe apneic duration that was 103 s longer than the control group. The lowest mean SpO(2) value during the induction period was 3.8% higher in the oxygen group compared to the control group. Following intubation, patients in the oxygen group had a mean end tidal carbon dioxide (ETCO2) level that was 3.0 mmHg higher than patients in the control group. Conclusions In obese patients, oxygen insufflation at 15 L/min through a nasopharyngeal airway and standard nasal cannula can significantly increase the safe apneic duration during induction of anesthesia.

Study objective: To evaluate the intraoperative hemodynamics and medication requirements of cocaine-positive patients compared to matched cocaine-negative controls. Design: Retrospective cohort study. Setting: Public county hospital. Patients: 821 patients undergoing general anesthesia. Measurements: Incidence of hemodynamic events, defined by a mean arterial pressure of < 65 mmHg or > 105 mmHg or a heart rate of < 50 beats per minute or > 100 beats per minute. Main results: Cocaine-positive patients did not experience a higher incidence of hemodynamic events when compared with matched cocaine-negative patients. Cocaine-positive patients were not more likely to be administered vasopressors intraoperatively but did receive more anti-hypertensive agents. The minimum alveolar concentration of anesthetics used was similar between the two groups. Anesthesia duration, length of stay, and in-hospital mortality did not significantly differ between the two cohorts. Conclusions: Cocaine-positive patients did not demonstrate more intraoperative hemodynamic events or adverse short-term outcomes as compared to matched cocaine-negative controls.