Influence of Nitrous Oxide on Minimum Alveolar Concentration of Sevoflurane for Laryngeal Mask Insertion in Children

2003 ◽  
Vol 99 (5) ◽  
pp. 1055-1058 ◽  
Author(s):  
Shinichi Kihara ◽  
Yuichi Yaguchi ◽  
Shinichi Inomata ◽  
Seiji Watanabe ◽  
Joseph R. Brimacombe ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Minimum Alveolar Concentration ◽  
Interaction Coefficient ◽  
Laryngeal Mask ◽  
Inhalational Induction ◽  
Laryngeal Mask Insertion ◽  
American Society ◽  
End Tidal ◽  
American Society Of Anesthesiologists ◽  
To Receive

Background Inhalational induction with sevoflurane and nitrous oxide is frequently used for Laryngeal Mask Airway (LMA; Laryngeal Mask Company, Henley-on-Thames, United Kingdom) insertion in children. The authors determined the influence of nitrous oxide on the minimum alveolar concentration (MAC) of sevoflurane for LMA insertion. Methods One hundred twenty unpremedicated children (age, 1-9 yr; American Society of Anesthesiologists physical status I) were randomly assigned to receive 1 of 15 end-tidal concentrations of nitrous oxide and sevoflurane for inhalational induction via a facemask: 0% nitrous oxide with 1.2, 1.4, 1.6, 1.8, or 2.0% sevoflurane; 33% nitrous oxide with 0.8, 1.0, 1.2, 1.4, or 1.6% sevoflurane; or 67% nitrous oxide with 0.4, 0.6, 0.8, 1.0, or 1.2% sevoflurane. The LMA was inserted after steady state end-tidal anesthetic concentrations had been maintained for 15 min. The response to insertion was recorded by three independent blinded observers. The interaction between nitrous oxide and sevoflurane was determined using logistic regression analysis. Results The MAC of sevoflurane for LMA insertion (95% confidence limit) was 1.57% (1.42-1.72%), and the concentration of sevoflurane required to prevent movement in 95% of children was 1.99% (1.81-2.57%). The addition of 33% and 67% nitrous oxide linearly decreased the MAC of sevoflurane for LMA insertion by 22% and 49%, respectively (P < 0.001). The interaction coefficient between nitrous oxide and sevoflurane did not differ from zero (P = 0.7843), indicating that the relation was additive. Conclusions Nitrous oxide and sevoflurane suppress the responses to LMA insertion in a linear and additive fashion in children.

Xenon Provides Faster Emergence from Anesthesia than Does Nitrous Oxide-sevoflurane or Nitrous Oxide-isoflurane 

1997 ◽  
Vol 86 (6) ◽  
pp. 1273-1278 ◽  
Author(s):  
Takahisa Goto ◽  
Hayato Saito ◽  
Masahiro Shinkai ◽  
Yoshinori Nakata ◽  
Fumito Ichinose ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Minimum Alveolar Concentration ◽  
Total Abdominal Hysterectomy ◽  
Abdominal Hysterectomy ◽  
Patient Demographics ◽  
The Mean ◽  
American Society ◽  
End Tidal ◽  
To Receive ◽  
Rapid Emergence

Background Xenon, an inert gas with anesthetic properties (minimum alveolar concentration [MAC] = 71%), has an extremely low blood:gas partition coefficient (0.14). Therefore, we predicted that xenon would provide more rapid emergence from anesthesia than does N2O+isoflurane or N2O+sevoflurane of equivalent MAC. Methods Thirty American Society of Anesthsiologists class I or II patients undergoing total abdominal hysterectomy were randomly assigned to receive 60% xenon, 60% N2O + 0.5% isoflurane, or 60% N2O + 0.70% sevoflurane (all concentrations are end-tidal: n = 10 per group). After placement of an epidural catheter, anesthesia was induced with standardized doses of midazolam, thiopental, and fentanyl. Thirty minutes later, xenon, N2O+isoflurane, or N2O+sevoflurane was started as previously assigned. These regimens were supplemented with epidural anesthesia with mepivacaine so that the mean arterial pressure and heart rate were controlled within 20% of the preoperative values. At the end of operation lasting approximately 2 h, all inhalational anesthetics were discontinued, and the patients were allowed to awaken while breathing spontaneously on an 8 l/min inflow of oxygen. A blinded investigator recorded the time until the patient opened her eyes on command (T1), was judged ready for extubation (T2), could correctly state her name, her date of birth, and the name of the hospital (T3), and could count backward from 10 to 1 in less than 15 s (T4). Results Emergence times from xenon anesthesia were: T1, 3.4 +/- 0.9 min; T2, 3.6 +/- 1 min; T3, 5.2 +/- 1.4 min; and T4, 6.0 +/- 1.6 min (mean +/- SD). These were one half to one third of those from N2O+sevoflurane (T1, 6.0 +/- 1.7 min; T4, 10.5 +/- 2.5 min) or N2O+isoflurane (T1, 7.0 +/- 1.9 min; T4, 14.3 +/- 2.8 min) anesthesia. The three groups did not differ in terms of patient demographics, the duration of anesthesia, the amount of epidural mepivacaine administered, or the postoperative pain rating. No patient could recalls intraoperative events. Conclusions Emergence from xenon anesthesia is two or three times faster than that from equal-MAC N2O+isoflurane or N2O+sevoflurane anesthesia.

scholarly journals Laryngeal Mask Insertion following Inhalational Induction in Children: A Comparison between Halothane and Sevoflurane

1997 ◽  
Vol 25 (4) ◽  
pp. 413-416 ◽  
Author(s):  
T. K. Kwek ◽  
A. Ng
Keyword(s):  
Nitrous Oxide ◽  
Laryngeal Mask ◽  
Healthy Children ◽  
Emergence Time ◽  
Depth Of Anaesthesia ◽  
Laryngeal Masks ◽  
Inhalational Induction ◽  
Laryngeal Mask Insertion ◽  
The Difference ◽  
To Receive

The aim of this study was to compare laryngeal mask insertion conditions following inhalational induction with either halothane or sevoflurane. Fifty-eight healthy children scheduled for dental extraction were randomly assigned to receive nitrous oxide 66% in oxygen and 3.0 MAC of either halothane or sevoflurane introduced in a stepwise fashion. The laryngeal masks were inserted when an adequate depth of anaesthesia was attained and the reactions and time to insertion noted. Inhalational induction was smooth in both halothane and sevoflurane groups. Induction time and time to laryngeal mask insertion were significantly faster with sevoflurane. The conditions for laryngeal mask insertion were generally good with 86.2% and 89.2% in the halothane and sevoflurane groups respectively having had no reactions to insertion. The complications to laryngeal mask insertion encountered were mild. The emergence time from the anaesthetic was found to be shorter for sevoflurane but the difference was not statistically significant.

Additive Contribution of Nitrous Oxide to Sevoflurane Minimum Alveolar Concentration for Tracheal Intubation in Children 

1999 ◽  
Vol 91 (3) ◽  
pp. 667-667 ◽  
Author(s):  
Hilton D. Swan ◽  
Mark W. Crawford ◽  
Hwee Ling Pua ◽  
Derek Stephens ◽  
Jerrold Lerman
Keyword(s):  
Nitrous Oxide ◽  
Logistic Regression ◽  
Tracheal Intubation ◽  
Logistic Model ◽  
Minimum Alveolar Concentration ◽  
Interaction Coefficient ◽  
Regression Curves ◽  
Additive Contribution ◽  
End Tidal ◽  
To Receive

Background To study the interaction between nitrous oxide and sevoflurane during trachea intubation, the authors determined the minimum alveolar concentration of sevoflurane for tracheal intubation (MAC(TI)) with and without nitrous oxide in children. Methods Seventy-two children aged 1-7 yr were assigned randomly to receive one of three end-tidal concentrations of nitrous oxide and one of four end-tidal concentrations of sevoflurane: 0% nitrous oxide with 2.0, 2.5, 3.0, or 3.5% sevoflurane: 33% nitrous oxide with 1.5, 2.0, 2.5, or 3.0% sevoflurane; or 66% nitrous oxide with 1.0, 1.5, 2.0, or 2.5% sevoflurane. After steady state end-tidal anesthetic concentrations were maintained for at least 10 min, laryngoscopy and intubation were attempted using a straight-blade laryngoscope and an uncuffed tracheal tube. The interaction between nitrous oxide and sevoflurane was investigated using logistic regression analysis of the responses to intubation. Results Logistic regression curves of the probability of no movement in response to intubation in the presence of sevoflurane and 0, 33, and 66% nitrous oxide were parallel. The interaction coefficient between nitrous oxide and sevoflurane did not differ significantly from zero (P = 0.89) and was removed from the logistic model. The MAC(TI) (+/- SE) of sevoflurane was 2.66+/-0.16%, and the concentration of sevoflurane required to prevent movement in 95% of children was 3.54+/-0.25%. Thirty-three percent and 66% nitrous oxide decreased the MAC(TI) of sevoflurane by 18% and 40% (P<0.001), respectively. Conclusions We conclude that nitrous oxide and sevoflurane suppress the responses to tracheal intubation in a linear and additive fashion in children.

Comparative Hemodynamic Depression of Sevoflurane versus Halothane in Infants 

1997 ◽  
Vol 87 (4) ◽  
pp. 795-800 ◽  
Author(s):  
Eric Wodey ◽  
Patrick Pladys ◽  
Catherine Copin ◽  
Marie Madeleine Lucas ◽  
Andre Chaumont ◽  
...  
Keyword(s):  
Heart Rate ◽  
Cardiac Index ◽  
Elective Surgery ◽  
Physical Status ◽  
Inhalation Induction ◽  
Cardiovascular Side Effects ◽  
American Society ◽  
End Tidal ◽  
American Society Of Anesthesiologists ◽  
To Receive

Background The cardiovascular side effects of volatile anesthetics are one of the chief causes of postoperative complications in children, and infants seem to be at the greatest risk for this. This study compared cardiovascular changes at equipotent concentrations of sevoflurane and halothane in infants. Methods Thirty infants classified as American Society of Anesthesiologists physical status I or II who required elective surgery were randomized to receive either halothane or sevoflurane for inhalation induction. Cardiovascular and echocardiographic data were recorded in both groups at baseline and at end-tidal concentrations of 1 and 1.5 minimum alveolar concentration (MAC). Results Sevoflurane did not alter heart rate or cardiac index at all concentrations compared with awake values. Sevoflurane significantly decreased blood pressure and systemic vascular resistance compared with awake values at all concentrations. Shortening fraction and rate-corrected velocity of circumferential fiber shortening decreased at 1.5 but not at 1 MAC. Myocardial contractility assessed by stress-velocity index and stress-shortening index decreased significantly at all concentrations, but did not fall into the abnormal range at any concentration. Halothane caused a greater decrease in heart rate, shortening fraction, stress-shortening index, velocity of circumferential fiber shortening, stress-velocity index, and cardiac index at all concentrations than did sevoflurane. Conclusion Sevoflurane causes a lesser decrease in cardiac output than does halothane in infants.

Association of Ethnicity with the Minimum Alveolar Concentration of Sevoflurane

2007 ◽  
Vol 107 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Tiberiu Ezri ◽  
Daniel Sessler ◽  
Marian Weisenberg ◽  
Gleb Muzikant ◽  
Michael Protianov ◽  
...  
Keyword(s):  
Selective Breeding ◽  
Minimum Alveolar Concentration ◽  
Skin Incision ◽  
Physical Status ◽  
The Caucasus ◽  
Lifestyle Choices ◽  
American Society ◽  
End Tidal ◽  
American Society Of Anesthesiologists ◽  
Animal Strains

Abstract Background: Selective breeding produces animal strains with varying anesthetic sensitivity. It thus seems unlikely that various human ethnicities have identical anesthetic requirements. Therefore, the authors tested the hypothesis that the minimum alveolar concentration of sevoflurane differs significantly as a function of ethnicity. Methods: The authors recruited 90 American Society of Anesthesiologists physical status I and II adult patients belonging to three Jewish ethnic groups: European, Oriental, and Caucasian (from the Caucasus Mountain region). All were scheduled to undergo surgery requiring a skin incision exceeding 3 cm. Without premedication, anesthesia was induced with 6–8% sevoflurane in 100% oxygen, and tracheal intubation was facilitated with succinylcholine. The skin incision was made after a predetermined end-tidal concentration of sevoflurane of 2.0% was maintained for at least 10 min in the first patient in each group. Blinded investigators observed the patient for movement during the subsequent minute. The concentration in the next patient was increased by 0.2% when patients moved, or decreased by the same amount when they did not. Results are presented as means [95% confidence intervals]. Results: Morphometric and demographic characteristics were similar among the groups; however, mean arterial pressure was slightly greater in European Jews. Minimum alveolar concentration for sevoflurane was greatest in Caucasian Jews (2.32% [2.27–2.41%]), less in Oriental Jews (2.14% [2.06–2.22%]), and still less in European Jews (1.9% [1.82–1.99%]) (P < 0.001). Conclusions: The results suggest that minimum alveolar concentration varies as a function of ethnicity. However, the extent to which confounding characteristics contribute, including lifestyle choices and environmental factors, remains unknown.

Epidural Neostigmine versus Fentanyl to Decrease Bupivacaine Use in Patient-controlled Epidural Analgesia during Labor

2017 ◽  
Vol 127 (1) ◽  
pp. 50-57 ◽  
Author(s):  
Jessica L. Booth ◽  
Vernon H. Ross ◽  
Kenneth E. Nelson ◽  
Lynnette Harris ◽  
James C. Eisenach ◽  
...  
Keyword(s):  
Epidural Analgesia ◽  
Local Anesthetic ◽  
Primary Outcome ◽  
A Priori ◽  
Regulatory Compliance ◽  
Epidural Bupivacaine ◽  
American Society ◽  
American Society Of Anesthesiologists ◽  
Labor Epidural ◽  
To Receive

Abstract Background The addition of opioids to epidural local anesthetic reduces local anesthetic consumption by 20% but at the expense of side effects and time spent for regulatory compliance paperwork. Epidural neostigmine also reduces local anesthetic use. The authors hypothesized that epidural bupivacaine with neostigmine would decrease total hourly bupivacaine use compared with epidural bupivacaine with fentanyl for patient-controlled epidural analgesia. Methods A total of 215 American Society of Anesthesiologists physical status II, laboring parturients requesting labor epidural analgesia consented to the study and were randomized to receive 0.125% bupivacaine with the addition of either fentanyl (2 μg/ml) or neostigmine (2, 4, or 8 μg/ml). The primary outcome was total hourly local anesthetic consumption, defined as total patient-controlled epidural analgesia use and top-ups (expressed as milliliters of 0.125% bupivacaine) divided by the infusion duration. A priori analysis determined a group size of 35 was needed to have 80% power at α = 0.05 to detect a 20% difference in the primary outcome. Results Of 215 subjects consented, 151 patients were evaluable. Demographics, maternal and fetal outcomes, and labor characteristics were similar among groups. Total hourly local anesthetic consumption did not differ among groups (P = 0.55). The total median hourly bupivacaine consumption in the fentanyl group was 16.0 ml/h compared with 15.3, 14.6, and 16.2 ml/h in the 2, 4, and 8 μg/ml neostigmine groups, respectively (P = 0.55). Conclusions The data do not support any difference in bupivacaine requirements for labor patient-controlled epidural analgesia whether patients receive epidural bupivacaine with 2 to 8 μg/ml neostigmine or epidural bupivacaine with 2 μg/ml fentanyl.

scholarly journals Management of Pain During Propofol Injection Using Intravenous Nitroglycerine

KYAMC Journal ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 202-205
Author(s):  
Muhammad Sazzad Hossain ◽  
Mohammad Mamunur Rashid ◽  
Md Anisur Rahman Babu ◽  
Afsana Sultana ◽  
Md Sirajul Islam Mahfuz ◽  
...  
Keyword(s):  
Placebo Group ◽  
Venous Occlusion ◽  
Saline Group ◽  
Injection Pain ◽  
Group A ◽  
American Society ◽  
Group B ◽  
Double Blinded ◽  
American Society Of Anesthesiologists ◽  
To Receive

Background: Propofol is an intravenous (IV) anesthetic agent, can irritate the skin, mucous membrane and venous intima. The main drawback is the pain at injection site following its intravenous injection. Objectives: This study was performed to evaluate the effect of intravenous nitroglycerine on pain in patients following propofol injection. Materials and Methods: Eighty adult patients of both sexes, aged 20-50 years, according to American Society of Anesthesiologists (ASA) physical status were divided into two equal groups (n=40) to receive 200 mcg intravenous nitroglycerine diluted in 10 ml saline (group A) and 10 ml normal saline as placebo (group B) at an ambient operating room temperature in a randomized and double blinded fashion to compare the pain-relieving effects of the drugs during propofol injection before the patients lost consciousness. The pain on propofol injection was assessed according to the Mc Crirrick and Hunter scale. Results: The overall incidence and severity of pain were significantly less in Groups A (nitroglycerine group) than group B (placebo group) (p< 0.05). The incidence of mild and moderate pain in Group A versus group B was 25% vs 45% and 15% vs 30% respectively (p<0.05). The incidence of score '0' (no pain) was higher in Group A (60%) than Group B (25%) (p<0.05). Conclusion: Pretreatment with 200 mcg nitroglycerine with venous occlusion for one minute is effective pretreatment in alleviating propofol injection pain when compared to placebo. KYAMC Journal Vol. 10, No.-4, January 2020, Page 202-205

Minimum Alveolar Concentration (MAC) of Xenon with Sevoflurane in Humans

2001 ◽  
Vol 94 (4) ◽  
pp. 611-614 ◽  
Author(s):  
Yoshinori Nakata ◽  
Takahisa Goto ◽  
Yoshiki Ishiguro ◽  
Katsuo Terui ◽  
Hiromasa Kawakami ◽  
...  
Keyword(s):  
Logistic Regression ◽  
Minimum Alveolar Concentration ◽  
Interaction Coefficient ◽  
Bodily Movement ◽  
Xenon Concentration ◽  
Multiple Variable ◽  
End Tidal ◽  
Somatic Response ◽  
Technological Limitations ◽  
Group Target

Background Although more than 30 yr ago the minimum alveolar concentration (MAC) of xenon was determined to be 71%, that previous study had technological limitations, and no other studies have confirmed the MAC value of xenon since. The current study was designed to confirm the MAC value of xenon in adult surgical patients using more modern techniques. Methods Sixty patients were anesthetized with sevoflurane with or without xenon. They were randomly allocated to one of four groups; patients in group 1 received no xenon, whereas those in groups 2, 3, and 4 received end-tidal concentrations of 20, 40, and 60%, respectively (n = 15 each group). Target end-tidal sevoflurane concentrations were chosen using the "up-and-down" method in each group. After steady state sevoflurane and xenon concentrations were maintained for at least 15 min, each patient was monitored for a somatic response at surgical incision. Somatic response was defined as any purposeful bodily movement. The MAC of sevoflurane and its reduction by xenon was evaluated using the multiple independent variable logistic regression model. Results The interaction coefficient of the multiple variable logistic regression was not significantly different from zero (P = 0.143). The MAC of xenon calculated as xenon concentration that would reduce MAC of sevoflurane to 0% was 63.1%. Conclusions The authors could not determine whether interaction in blocking somatic responses in 50% of patients is additive. The MAC of xenon is in the range of the values that were predicted in a previous study.

The Combitube in Elective Surgery

2001 ◽  
Vol 94 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Luis A. Gaitini ◽  
Sonia J. Vaida ◽  
Somri Mostafa ◽  
Boris Yanovski ◽  
Milian Croitoru ◽  
...  
Keyword(s):  
Elective Surgery ◽  
Airway Device ◽  
Spontaneous Ventilation ◽  
Mechanically Ventilated ◽  
Entire Duration ◽  
Duration Of Surgery ◽  
American Society ◽  
End Tidal ◽  
American Society Of Anesthesiologists ◽  
Spontaneously Breathing

Background The Combitube has proved to be a valuable device for securing the airway in cases of difficult intubation. This study investigated the effectiveness of the Combitube in elective surgery during both mechanical and spontaneous ventilation. Methods Two hundred patients classified as American Society of Anesthesiologists physical status I and II, with normal airways, scheduled for elective surgery were randomly allocated into two groups: nonparalyzed, spontaneously breathing (n = 100); or paralyzed, mechanically ventilated (n = 100). After induction of general anesthesia and insertion of the Combitube, oxygen saturation, end-tidal carbon dioxide and isoflurane concentration, systolic and diastolic blood pressure and heart rate, as well as breath-by-breath spirometry data were obtained every 5 min. Results In 97% of patients, it was possible to maintain oxygenation, ventilation, and respiratory mechanics, as well as hemodynamic stability during either mechanical or spontaneous ventilation for the entire duration of surgery. The duration of surgery was between 15 and 155 min. Conclusions The results of this study suggest that the Combitube is an effective and safe airway device for continued management of the airway in 97% of elective surgery cases.

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