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oxygen concentration during anesthesia

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https://www.readbyqxmd.com/read/28099321/preoxygenation-physiologic-basis-benefits-and-potential-risks
#1
Usharani Nimmagadda, M Ramez Salem, George J Crystal
Preoxygenation before anesthetic induction and tracheal intubation is a widely accepted maneuver, designed to increase the body oxygen stores and thereby delay the onset of arterial hemoglobin desaturation during apnea. Because difficulties with ventilation and intubation are unpredictable, the need for preoxygenation is desirable in all patients. During emergence from anesthesia, residual effects of anesthetics and inadequate reversal of neuromuscular blockade can lead to hypoventilation, hypoxemia, and loss of airway patency...
February 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28051988/ultraportable-oxygen-concentrator-use-in-u-s-army-special-operations-forward-area-surgery-a-proof-of-concept-in-multiple-environments
#2
Michael Rybak, Lynn C Huffman, Richard Nahouraii, John Loden, Marcos Gonzalez, Ramey Wilson, Paul D Danielson
INTRODUCTION: A limitation to surgical care in an austere environment is the supply of oxygen to support mechanical ventilation and general anesthesia. Portable oxygen concentrators (OCs) offer an alternative to traditional compressed oxygen tanks. OBJECTIVES: We set out to demonstrate that a low-pressure OC system could supply the mechanical ventilation needs in an austere operating environment. METHODS: An ultraportable OC (SAROS Model 3000, SeQual Technologies, Ball Ground, Georgia) was paired with an Impact 754 ventilator (Impact Instrumentation, West Caldwell, New Jersey) to evaluate the delivered fraction of inspired oxygen (FiO2) to a test lung across a range of minute ventilations and at altitudes of 1,200 and 6,500 feet above sea level...
January 2017: Military Medicine
https://www.readbyqxmd.com/read/28006942/propofol-induced-mitochondrial-and-contractile-dysfunction-of-the-rat-ventricular-myocardium
#3
M Grundmanová, D Jarkovská, A Süß, Z Tůma, M Marková, Z Grundman, A El-Kadi, M Čedíková, M Štengl, J Kuncová
Propofol is a short-acting hypnotic agent used in human medicine for sedation and general anesthesia. Its administration can be associated with serious cardiovascular side-effects that include decrease in arterial blood pressure and cardiac output. The aim of the present study was to evaluate propofol effects on mitochondrial respiration, myocardial contractility and electrophysiology in the same samples isolated from the heart ventricles of adult rats. Mitochondrial oxygen consumption was measured in permeabilized samples dissected from free walls of both ventricles using high-resolution respirometry...
December 22, 2016: Physiological Research
https://www.readbyqxmd.com/read/27916222/acute-amiodarone-pulmonary-toxicity-after-surgical-procedures
#4
REVIEW
Jirapat Teerakanok, Pakpoom Tantrachoti, Phumpattra Chariyawong, Kenneth Nugent
Amiodarone can cause toxicity in several organs, including amiodarone-induced pulmonary toxicity which is a subacute or chronic complication. Amiodarone-induced acute respiratory distress syndrome (ARDS) in postoperative patients is a rare acute complication. The PubMed and Google Scholar databases were searched. Seven retrospective and prospective case series and 10 case reports of amiodarone-induced postoperative ARDS were reviewed. All patients received amiodarone chronically or during the perioperative period...
December 2016: American Journal of the Medical Sciences
https://www.readbyqxmd.com/read/27890467/use-of-hyperbaric-oxygen-therapy-and-pegylated-carboxyhemoglobin-bovine-in-a-jehovah-s-witness-with-life-threatening-anemia-following-postpartum-hemorrhage
#5
K Thenuwara, J Thomas, M Ibsen, U Ituk, K Choi, E Nickel, M J Goodheart
We present a case of a Jehovah's Witness patient who refused blood products, with the exception of albumin and clotting factors, and underwent cesarean section under spinal anesthesia complicated by postpartum hemorrhage. She was fluid resuscitated and treated with multiple uterotonics and internal iliac artery embolization. Because of agitation she required emergency tracheal intubation. Her hemoglobin concentration dropped from a preoperative value of 12mg/dL to 3mg/dL on postoperative day one. She was acidotic, requiring vasopressors for hemodynamic stability and remained ventilated and sedated...
October 24, 2016: International Journal of Obstetric Anesthesia
https://www.readbyqxmd.com/read/27867719/monitoring-cerebral-oxygenation-and-local-field-potential-with-a-variation-of-isoflurane-concentration-in-a-rat-model
#6
Dong-Hyuk Choi, Teo Jeon Shin, Seonghyun Kim, Jayyoung Bae, Dongrae Cho, Jinsil Ham, Ji-Young Park, Hyoung-Ihl Kim, Seongwook Jeong, Boreom Lee, Jae Gwan Kim
We aimed to investigate experimentally how anesthetic levels affect cerebral metabolism measured by near-infrared spectroscopy (NIRS) and to identify a robust marker among NIRS parameters to discriminate various stages of anesthetic depth in rats under isoflurane anesthesia. In order to record the hemodynamic changes and local field potential (LFP) in the brain, fiber-optic cannulae and custom-made microelectrodes were implanted in the frontal cortex of the skull. The NIRS and LFP signals were continuously monitored before, during and after isoflurane anesthesia...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27771984/the-effects-of-adding-ischemic-preconditioning-during-desflurane-inhalation-anesthesia-or-propofol-total-intravenous-anesthesia-on-pneumoperitoneum-induced-oxidative-stress
#7
Safinaz Karabayirli, Onder Surgit, Hulya Kasikara, Cemile Koca Bicer, Merve Ergin, Ruveyda Irem Demircioglu, Bunyamin Muslu
BACKGROUND: The aim of the study was to explore the differences in oxidative stress during anesthesia with desflurane/N2O or propofol/remifentanil in patients undergoing laparoscopic cholecystectomy and additionally to evaluate the differential effects of desflurane and propofol on ischemic preconditioning (IP). MATERIALS AND METHODS: One hundred patients were randomly allocated to four groups. For anesthesia maintenance, the inhalation group (Group I) and the inhalation plus IP group (Group IIP) received desflurane at an end-tidal concentration of 4-6 vol% in oxygen/N2O, and the TIVA group (Group T) and TIVA plus IP group (Group TIP) received infusions of propofol and remifentanil...
October 24, 2016: Acta Chirurgica Belgica
https://www.readbyqxmd.com/read/27725946/design-of-multichannel-functional-near-infrared-spectroscopy-system-with-application-to-propofol-and-sevoflurane-anesthesia-monitoring
#8
Zhenhu Liang, Yue Gu, Xuejing Duan, Lei Cheng, Shujuan Liang, Yunjie Tong, Xiaoli Li
Monitoring the changes of cerebral hemodynamics and the state of consciousness during general anesthesia (GA) is clinically important. There is a great need for developing advanced detectors to investigate the physiological processes of the brain during GA. We developed a multichanneled, functional near-infrared spectroscopy (fNIRS) system device and applied it to GA operation monitoring. The cerebral hemodynamic data from the forehead of 11 patients undergoing propofol and sevoflurane anesthesia were analyzed...
October 2016: Neurophotonics
https://www.readbyqxmd.com/read/27725350/cardiorespiratory-effects-of-isoflurane-in-asiatic-black-bears-ursus-thibetanus-anesthetized-with-intramuscular-medetomidine-and-zolazepam-tiletamine
#9
Dong-Hyuk Jeong, Jeong-Jin Yang, Seong-Hoon Seok, Dong-Joo Song, Seong-Chan Yeon
The objective of this study was to determine the dose-dependent effects of isoflurane on various cardiovascular parameters and the stable range of isoflurane concentrations in Asiatic black bears (Ursus thibetanus). Seven Asiatic black bears were intramuscularly injected with medetomidine, zolazepam, and tiletamine (MZT) to induce anesthesia and anesthesia was maintained by administering isoflurane in 100% oxygen (4 l/min) without mechanical ventilation. Several cardiovascular parameters were measured at five end-tidal isoflurane concentrations (0...
September 30, 2016: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/27708522/anesthesia-for-endoscopic-retrograde-cholangiopancreatography-target-controlled-infusion-versus-standard-volatile-anesthesia
#10
Youssef Motiaa, Mustapha Bensghir, Abdelhamid Jaafari, Mohammed Meziane, Redouane Ahtil, Noureddine Drissi Kamili
BACKGROUND: Endoscopic retrograde cholangiopancreatography (ERCP) is a technique used both for diagnosis and for the treatment of biliary and pancreatic diseases. ERCP has some anesthetic implications and specific complications. The primary outcome aim was to compare two protocols in terms of time of extubation. We also compared anesthetic protocols in terms of hemodynamic and respiratory instability, antispasmodics needs, endoscopist satisfaction, and recovery room stay. METHODS: Patients were randomized into two groups standard anesthesia group (Gr: SA) in whom induction was done by propofol, fentanyl and cisatracurium and maintenance was done by a mixture of oxygen, nitrousoxide (50%:50%) and sevoflurane; and intravenous anesthesia group to target concentration (Gr: TCI) in whom induction and maintenance of anesthesia were done with propofol with a target 0...
October 2016: Annals of Gastroenterology: Quarterly Publication of the Hellenic Society of Gastroenterology
https://www.readbyqxmd.com/read/27691965/anesthesia-in-a-captive-juvenile-black-rhinoceros-diceros-bicornis-for-magnetic-resonance-imaging-and-computed-tomography
#11
Cameron Ratliff, Rebecca S Sayre, Mauricio Lepiz
A hand-reared, 53-kg, female, 30-day-old black rhinoceros ( Diceros bicornis ) calf presented for magnetic resonance imaging and computed tomography after demonstrating neurologic signs. The rhino was premedicated intramuscularly with butorphanol and midazolam, yielding satisfactory sedation. Induction was achieved using intravenous propofol until the trachea could be intubated. Anesthesia was maintained with sevoflurane in 100% oxygen (mean end-tidal concentration of 2 ± 0.5%). Mean values recorded during anesthesia included were heart rate, end-tidal carbon dioxide, respiratory rate, noninvasive blood pressure, and pulse oximetry...
September 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/27684833/use-of-the-glidescope-video-laryngoscope-for-intubation-during-ex-utero-intrapartum-treatment-in-a-fetus-with-a-giant-cyst-of-the-4th-branchial-cleft-a-case-report
#12
Sung Hye Byun, So Young Lee, Seong Yeon Hong, Taeha Ryu, Baek Jin Kim, Jin Yong Jung
INTRODUCTION: In fetuses who are predicted to be at risk of catastrophic airway obstruction at delivery, the ex utero intrapartum treatment (EXIT) procedure is useful for securing the fetal airway while maintaining fetal oxygenation via placental circulation. Factors, including poor posture of the fetus and physician, narrow visual field, and issues of contamination in the aseptic surgical field, make fetal intubation during the EXIT procedure difficult. Herein, we report our experience of the usefulness of the GlideScope video laryngoscope (GVL) for intubation during the EXIT procedure...
September 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27617689/neural-correlates-of-sevoflurane-induced-unconsciousness-identified-by-simultaneous-functional-magnetic-resonance-imaging-and-electroencephalography
#13
Andreas Ranft, Daniel Golkowski, Tobias Kiel, Valentin Riedl, Philipp Kohl, Guido Rohrer, Joachim Pientka, Sebastian Berger, Alexander Thul, Max Maurer, Christine Preibisch, Claus Zimmer, George A Mashour, Eberhard F Kochs, Denis Jordan, Rüdiger Ilg
BACKGROUND: The neural correlates of anesthetic-induced unconsciousness have yet to be fully elucidated. Sedative and anesthetic states induced by propofol have been studied extensively, consistently revealing a decrease of frontoparietal and thalamocortical connectivity. There is, however, less understanding of the effects of halogenated ethers on functional brain networks. METHODS: The authors recorded simultaneous resting-state functional magnetic resonance imaging and electroencephalography in 16 artificially ventilated volunteers during sevoflurane anesthesia at burst suppression and 3 and 2 vol% steady-state concentrations for 700 s each to assess functional connectivity changes compared to wakefulness...
November 2016: Anesthesiology
https://www.readbyqxmd.com/read/27610263/severe-hypotension-hypoxia-and-subcutaneous-erythema-induced-by-indigo-carmine-administration-during-open-prostatectomy
#14
Koichiro Nandate, Bryan B Voelzke
Indigo carmine (also known as 5,5'-indigodisulfonic acid sodium salt or indigotine) is a blue dye that is administered intravenously to examine the urinary tract and usually is biologically safe and inert. Indigo carmine rarely may cause adverse reactions. We treated a 66-year-old man who had general anesthesia and radical retropubic prostatectomy for prostate cancer. He had a previous history of allergy to bee sting with nausea, vomiting, and dizziness. Within 1 minute after injection of indigo carmine for evaluation of the ureters, the patient developed hypotension to 40 mmHg, severe hypoxia (the value of SpO2 (peripheral capillary oxygen saturation) was 75% on 40% inspired oxygen concentration), poor air movement and bilateral diffuse wheezing on auscultation, and marked subcutaneous erythema at the upper extremities...
2016: Case Reports in Urology
https://www.readbyqxmd.com/read/27585416/effect-of-injection-pressure-of-infiltration-anesthesia-to-the-jawbone
#15
Kenji Yoshida, Eri Tanaka, Hiroyoshi Kawaai, Shinya Yamazaki
To obtain effective infiltration anesthesia in the jawbone, high concentrations of local anesthetic are needed. However, to reduce pain experienced by patients during local anesthetic administration, low-pressure injection is recommended for subperiosteal infiltration anesthesia. Currently, there are no studies regarding the effect of injection pressure on infiltration anesthesia, and a standard injection pressure has not been clearly determined. Hence, the effect of injection pressure of subperiosteal infiltration anesthesia on local anesthetic infiltration to the jawbone was considered by directly measuring lidocaine concentration in the jawbone...
2016: Anesthesia Progress
https://www.readbyqxmd.com/read/27565964/a-comparative-analysis-of-the-effects-of-sevoflurane-and-propofol-on-cerebral-oxygenation-during-steep-trendelenburg-position-and-pneumoperitoneum-for-robotic-assisted-laparoscopic-prostatectomy
#16
Aya Doe, Motoi Kumagai, Yuichiro Tamura, Akira Sakai, Kenji Suzuki
PURPOSE: Steep Trendelenburg position and pneumoperitoneum during robotic-assisted laparoscopic prostatectomy (RALP) increase intracranial pressure (ICP) and may alter cerebral blood flow (CBF) and oxygenation. Volatile anesthetics and propofol have different effects on ICP, CBF, and cerebral metabolic rate and may have different impact on cerebral oxygenation during RALP. In this study, we measured jugular venous bulb oxygenation (SjO2) and regional oxygen saturation (SctO2) in patients undergoing RALP to evaluate cerebral oxygenation and compared the effects of sevoflurane and propofol...
December 2016: Journal of Anesthesia
https://www.readbyqxmd.com/read/27558533/developing-an-objective-method-for-analyzing-vital-signs-changes-in-neonates-during-general-anesthesia
#17
Matthias Görges, Nicholas C West, Edda Karlsdóttir, J Mark Ansermino, Myles Cassidy, Gillian R Lauder
BACKGROUND: Commonly used general anesthetics are considered to be neurotoxic to the developing rodent brain, leading to poor long-term outcome. However, it is unclear whether these rodent studies can be extrapolated to the human neonate. Given that anesthesia for urgent neonatal surgery cannot be avoided, it is vitally important to assess other factors that may impact neurological outcome following anesthesia and surgery. OBJECTIVE: The purpose of this study is to identify thresholds for detecting vital sign deviations, which may have the potential for affecting neurological outcome following anesthesia and surgery in neonates...
November 2016: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/27473996/blood-concentrations-of-remifentanil-during-and-after-infusion-in-horses-anesthetized-with-isoflurane-and-dexmedetomidine
#18
Perrine Benmansour, Jennifer Billinsky, Tanya Duke-Novakovski, Jane Alcorn
OBJECTIVE: To determine blood remifentanil concentration in isoflurane-anesthetized horses during and after a 1h remifentanil and dexmedetomidine infusion. STUDY DESIGN: Prospective study. ANIMALS: Six adult mixed breed horses with (mean±SD) bodyweight of 507±61kg and 14±4years of age. METHODS: Following sedation with xylazine IV, anesthesia was induced with ketamine IV mixed with diazepam IV. Anesthesia was maintained with isoflurane in oxygen...
August 2016: Research in Veterinary Science
https://www.readbyqxmd.com/read/27472727/awakening-arterial-blood-and-end-tidal-concentrations-of-isoflurane-in-female-surgical-patients
#19
Tso-Chou Lin, Chih-Cherng Lu, Che-Hao Hsu, Joseph V Pergolizz, Cheng-Chang Chang, Meei-Shyuan Lee, Shung-Tai Ho
Delayed extubation occurs after isoflurane anesthesia, especially following prolonged surgical duration. We aimed to determine the arterial blood concentrations of isoflurane and the correlation with end-tidal concentrations for predicting emergence from general anesthesia.Thirty-four American Society of Anesthesiologists physical status class I-II gynecologic patients were included. General anesthesia was maintained with a fixed 2% inspiratory isoflurane in 6 L/minute oxygen, which was discontinued after surgery...
July 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27468496/-entropy-monitoring-during-low-flow-inhalation-anesthesia-a-tribute-to-fashion-or-necessity
#20
V I Gorban, A V Shchegolev, D A Kharitonov
OBJECTIVE: To compare anesthesia quality and sevoflurane consumption during standard and extended intraoperative monitoring. MATERIALS AND METHODS: 74 patients were included in prospective randomized study. Patients had spinal pathology of varying severity, extension and localization. A comparative evaluation of standard and extended (with entropy) monitoring was performed during low-flow inhalation anesthesia with the automated control of the anesthetic concentration and exhaled oxygen fraction (Et-control)...
March 2016: Anesteziologiia i Reanimatologiia
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