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  • 1
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Remifentanil ; Propofol ; Desfluran ; Aufwachverhalten ; kardiovaskuläre Effekte ; Key words Remifentanil ; Propofol ; Desflurane ; Cardiovascular effects ; Emergence times
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Objective: To ascertain whether there is a difference between total intravenous anaesthesia with propofol (P) and remifentanil (R) and inhalational anaesthesia with desflurane (D) and nitrous oxide (N) with regard to haemodynamic reactions, recovery profile and postoperative analgesic demand in patients scheduled for elective microsurgical vertebral disc resection. Methods: 50 patients (ASA I–II, 18–65 years) were randomly assigned to receive total intravenous anaesthesia with propofol and remifentanil or inhalational anaesthesia with desflurane and nitrous oxide. After standardised induction of anaesthesia in both groups (1 µg·kg−1 remifentanil, 1.5 mg·kg−1 propofol, 0.1 mg·kg−1 cisatracurium), anaesthesia was maintained in the D/N group with desflurane in 50% N2O. The patients of the P/R group received a constant infusion of 2 mg·kg−1·h−1 propofol and a constant infusion of 0.5 µg·kg−1·min−1 remifentanil, which was reduced after 15 min by 50%. The administration of desflurane and the infusion of the anaesthetics were adjusted to maintain a surgical depth of anaesthesia. At the end of surgery the anaesthetics were discontinued and early emergence from anaesthesia was assessed by measuring time to spontaneous ventilation (VT〉4 ml/kg), tracheal extubation, opening of the eyes and stating correct name and data of birth. The frequency of analgesics and total demand for analgesics were determined using patient-controlled analgesia and recorded for 2 h postoperatively. In addition the pain level of the patients was measured on a visual analogue scale and the incidence of postoperative shivering, nausea and vomiting was noted. Results: Patients anaesthetised with desflurane responded to tracheal intubation and skin incision with increasing blood pressure and showed higher heart rates than patients anaesthetised with propofol and remifentanil, but there were no other haemodynamic differences between the groups in response to surgical stimuli. There were significantly shorter times to spontaneous ventilation (3.2 vs. 6.3 min), extubation (3.8 vs. 9.5 min), eye opening (3.0 vs. 11.5 min) and giving name and date of birth (4.8 vs. 14.3 min) in patients anaesthetised with remifentanil and propofol than in those receiving desflurane and nitrous oxide. In addition, patients anaesthetised with remifentanil and propofol had a greater incidence of postoperative shivering. There were no significant differences between the two groups in the patients’ pain scores, analgesic demand and incidence of nausea and vomiting. Conclusion: Patients anaesthetised with propofol and remifentanil have significantly shorter emergence times than patients anaesthetised with desflurane and nitrous oxide. The low incidence of postoperative pain after microsurgical vertebral disc resections requires no large-scale analgesic therapy, even after total intravenous anaesthesia including remifentanil.
    Notes: Zusammenfassung Fragestellung: Unterscheidet sich eine totale intravenöse Anästhesie mit Propofol (P) und Remifentanil (R) von einer Inhalationsanästhesie mit Desfluran (D) und Lachgas (L) bei lumbalen Bandscheibenoperationen hinsichtlich der Steuerbarkeit der Narkose, der Beeinflussung hämodynamischer Parameter, des Aufwachverhaltens und des postoperativen Analgetikabedarfs der Patienten? Methodik: 50 Patienten (ASA I–II, 18–65 Jahre) wurden randomisiert entweder einer P/R- oder D/L-Gruppe zugeteilt. Nach standardisierter Narkoseeinleitung (1 µg/kg Remifentanil, 1,5 mg/kg Propofol, 0,1 mg/kg Cisatracurium) wurde die Anästhesie in der D/L-Gruppe bedarfsadaptiert mit Desfluran in 50% N2O und in der P/R-Gruppe mit 2 mg/kg/h Propofol und 0,5 µg/kg/min Remifentanil aufrechterhalten, wobei die Remifentanildosis nach 15 min halbiert wurde. Am Operationsende unmittelbar vor der Umlagerung in die horizontale Rückenlage wurde die Zufuhr der Anästhetika abrupt unterbrochen und folgende Aufwachzeiten erfaßt: Eintritt Spontanatmung (VT〉4 ml/kg), Extubation, Augenöffnen, richtiges Benennen von Namen und Geburtsdatum und der Analgetikabedarf der ersten 2 postoperativen Stunden im Aufwachraum. Ergebnisse: Die Patienten der D/L-Gruppe reagierten auf den Intubationsreiz und die Hautinzision mit signifikanten Blutdruckanstiegen und zeigten signifikant höhere Herzfrequenzwerte, während ansonsten die hämodynamischen Parameter während des Narkoseverlaufs vergleichbar waren. Die Patienten der P/R-Gruppe erreichten signifikant früher eine stabile Spontanatmung (3,2 vs. 6,4 min), konnten früher extubiert werden (3,8 vs. 9,5 min), öffneten früher die Augen (3,0 vs. 11,5 min) und waren eher in der Lage, ihren Namen und Geburtsdatum zu benennen (4,8 vs. 14,3 min), wiesen aber auch signifikant häufiger Muskelzittern auf. Keine signifikanten Unterschiede fanden sich im Analgetikabedarf sowie in der Inzidenz von Übelkeit und Erbrechen. Schlußfolgerung: Die Patienten erwachen aus der TIVA mit Propofol/Remifentanil schneller als aus der Desfluran/N2O-Narkose und erreichen schneller ein höheres Vigilanzniveau, wobei die geringe Intensität postoperativer Wundschmerzen nach Bandscheibenoperationen kein aufwendiges Konzept zur postoperativen Analgesie erfordert.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Der Anaesthesist 45 (1996), S. 37-46 
    ISSN: 1432-055X
    Keywords: Schlüsselwörter Desfluran ; Isofluran ; Aufwachverhalten ; Hämodynamik ; Key words Desflurane ; Isoflurane ; Emergence times ; Haemodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Objectives. The new volatile anaesthetic desflurane is characterized by very low blood-gas and tissue-blood partition coefficients, so that rapid induction of anaesthesia and shorter recovery times can be expected. The aim of this investigation was to compare the effects of desflurane and isoflurane on haemodynamics and recovery time when used as part of a balanced anaesthesia technique for elective surgery. Methods. Fifty patients (18 years and older, ASA status I-III) scheduled for elective surgery (no laparoscopies) of at least 60 min duration were included in this open, randomised, phase-III clinical trial. After oral premedication with midazolam 7.5 mg 45 min before transfer to theatre, anaesthesia was induced with fentanyl 0.1 mg and thiopental 5 mg/kg; succinylcholine or vecuronium facilitated intubation. Desflurane and isoflurane, respectively, were used for maintenance of anaesthesia, both in 50% N2O, with the inspired concentration adapted to the degree of stimulation. All patients were ventilated in a semi-closed system; muscle relaxation was achieved with vecuronium. The electrocardiogram, heart rate (HR), and direct arterial blood pressure (BP) were recorded continuously and anaesthetic gas detection was performed by an infrared absorption technique. With termination of surgery the volatile anaesthetic was discontinued and the following emergence times recorded: spontaneous ventilation (VT〉300 ml), extubation, eye opening, correctly answering the date of birth, arrival in and possible discharge from the post-anaesthesia care unit (PACU). Results. In all, 49 patients were studied at random (desflurane n=24, isoflurane n=25). Data of demographics and anaesthetic technique were comparable in both groups (Tables 2 and 3). Anaesthetic elimination (expressed as FA/FAO) was significantly more rapid in the desflurane group 3 min after termination of anaesthesia (Fig. 1). Comparing the emergence times, there was no significant difference between desflurane and isoflurane: in both groups patients opened their eyes 12 min (median time) after termination of the operation (Table 4). Haemodynamics (HR, systolic and diastolic BP) were comparable at intubation, skin incision, end of surgery, extubation, and in the PACU (Fig. 2a, b). In 2 patients a rapid increase in the inspired concentration of desflurane during induction of anaesthesia produced a profound sympathoadrenergic reaction with an excessive increase in BP and HR. Similar reactions in other patients did not occur when the inspired concentration of desflurance was slowly increased. Conclusions. Despite the physicochemical properties of the new agent, emergence times were similar for desflurane and isoflurane in our study. These results, which are in contrast to those of some other authors, are most probably due to the study design, which included the use of premedicants (midazolam) and a low dose of fentanyl. The reported sympatho-adrenergic reactions after rapid changes in the inspired concentration of desflurane during induction of anaesthesia have been observed by others as well. It seems that this initial cardiovascular stimulation can be avoided by slow increases in desflurane concentration. In summary, desflurane compares to isoflurane in balanced anaesthesia for general surgical procedures with regard to haemodynamics, while the time to awakening is not necessarely reduced.
    Notes: Zusammenfassung Das neue Inhalationsanästhetikum Desfluran besitzt sehr niedrige Blut-Gas- und Gewebe-Blut-Verteilungskoeffizienten und läßt so raschere Ein- und Ausleitungszeiten erwarten. In der vorliegenden Phase-III-Studie wurden Aufwachverhalten und Hämodynamik unter Desfluran und Isofluran prospektiv randomisiert verglichen. Untersucht wurden 49 chirurgische Patienten (Desfluran n=24, Isofluran n=25) in balancierter Anästhesietechnik: orale Prämedikation mit 7,5 mg Midazolam; Einleitung mit 0,1 mg Fentanyl und 5 mg/kg Thiopental; Narkosebeatmung mit Desfluran 0,5–18 bzw. Isofluran 0,2–3,0 Vol%, jeweils in 50% N 2 O. Bei den hämodynamischen Parametern ergaben sich keine wesentlichen Unterschiede. Zwei Patienten reagierten nach rascher Erhöhung der Desfluran-Vapor-Einstellung mit Blutdruck- und Herzfrequenzanstieg. Diese Reaktion ließ sich bei allen weiteren Patienten durch langsame Dosissteigerung vermeiden. Nach Anästhesie-Ende flutete Desfluran signifikant schneller ab als Isofluran (F A /F A0 ). Trotzdem zeigten die Aufwachzeiten keinen signifikanten Unterschied (Augenöffnen jeweils nach 12 min), vermutlich bedingt durch die angewandte balancierte Anästhesietechnik, die durch gleichzeitigen Einsatz mehrerer Anästhetika zum Profilverlust der Einzelsubstanz führen kann. Zusammengefaßt ergibt sich, daß Desfluran als Hauptkomponente einer balancierten Anästhesie unter den Gesichtspunkten Steuerbarkeit und hämodynamische Stabilität für chirurgische Eingriffe ebenso geeignet erscheint wie Isofluran. Mit einem rascheren Erwachen ist aber bei der balancierten Anästhesietechnik nicht zwangsläufig zu rechnen.
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  • 3
    ISSN: 1573-0662
    Keywords: Antarctica ; Palmer ; Marsh ; Mawson ; aerosol particles ; biogeochemical cycles ; sulfate ; nitrate ; methanesulfonate ; lead-210 ; beryllium-7 ; sea-salt ; ammonium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract High volume bulk aerosol samples were collected continuously at three Antarctic sites: Mawson (67.60° S, 62.50° E) from 20 February 1987 to 6 January 1992; Palmer Station (64.77° S, 64.06° W) from 3 April 1990 to 15 June 1991; and Marsh (62.18° S, 58.30° W) from 28 March 1990, to 1 May 1991. All samples were analyzed for Na+, SO 4 2− , NO 3 − , methanesulfonate (MSA), NH 4 + ,210Pb, and7Be. At Mawson for which we have a multiple year data set, the annual mean concentration of each species sometimes vary significantly from one year to the next: Na+, 68–151 ng m−3; NO 3 − , 25–30 ng m−3; nss SO 4 2− , 81–97 ng m−3; MSA, 19–28 ng m−3; NH 4 + , 16–21 ng m−3;210Pb, 0.75–0.86 fCi m−3. Results from multiple variable regression of non-sea-salt (nss) SO 4 2− with MSA and NO 3 − as the independent variables indicates that, at Mawson, the nss SO 4 2− /MSA ratio resulting from the oxidation of dimethylsulfide (DMS) is 2.80±0.13, about 13% lower than our earlier estimate (3.22) that was based on 2.5 years of data. A similar analysis indicates that the ratio at Palmer is about 40% lower, 1.71±0.10, and more comparable to previous results over the southern oceans. These results when combined with previously published data suggest that the differences in the ratio may reflect a more rapid loss of MSA relative to nss SO 4 2− during transport over Antarctica from the oceanic source region. The mean210Pb concentrations at Palmer and Marsh and the mean NO 3 − concentration at Palmer are about a factor of two lower than those at Mawson. The210Pb distributions are consistent with a210Pb minimum in the marine boundary layer in the region of 40°–60° S. These features and the similar seasonalities of NO 3 − and210Pb at Mawson support the conclusion that the primary source regions for NO 3 − are continental. In contrast, the mean concentrations of MSA, nss SO 4 2− , and NH 4 + at Palmer are all higher than those at Mawson: MSA by a factor of 2; nss SO 4 2− by 10%; and NH 4 + by more than 50%. However, the factor differences exhibit substantial seasonal variability; the largest differences generally occur during the austral summer when the concentrations of most of the species are highest. NH 4 + /(nss SO 4 2− +MSA) equivalent ratios indicate that NH3 neutralizes about 60% of the sulfur acids during December at both Mawson and Palmer, but only about 30% at Mawson during February and March.
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  • 4
    ISSN: 1573-0662
    Keywords: Antarctica ; aerosol particles ; ice ; biogeochemical cycles ; sulfate ; nitrate ; methanesulfonate ; lcad-210 ; boryllium-7 ; sea-salt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract High volume aerosol samples were collected continuously at Mawson, Antarctica (67°36'S, 62°30'E), from February 1987 through October 1989. All samples were analyzed for Na+, Cl-, SO4 =, NO3 -, methanesulfonate (MSA), NH4 +,7Be, and210Pb. The annual mean concentrations of many of the species are very low, substantially lower than even those over the relatively pristine regions of the tropical and subtropical South Pacific. The concentrations at Mawson are comparable both in magnitude and in seasonality to those which have been measured in long term studies at the South Pole and at the coastal German Antarctic research station, Georg von Neumayer (GvN). This comparability suggests that the aerosol composition may be relatively uniform over a broad sector of the Antarctic. The concentrations of most of the species exhibit very strong and sharply-defined seasonal cycles. MSA, non-sea-salt (nss) SO4 = and NH4 + all exhibit similar cycles, with maxima during the austral summer (December through February) being more than an order of magnitude higher than the winter minima. The limited7Be data appears to exhibit a similar cycle. Although nitrate and210Pb also exhibit relatively high concentrations during the austral summer, their cycles are far more complex than those of the previous species with indications of multiple peaks. As expected, the concentration of sea-salt (as indicated by Na+ and Cl-) peaks during the winter. The results from multiple variable regression analyses indicate that the dominant source of nss SO4 = is the oxidation of dimethylsulfide (DMS) which produces MSA and nss SO4 = in a ratio of about 0.31 (about five times higher than that over the tropical and subtropical oceans). However, a very significant fraction (about 25%) of the nss SO4 = is associated with NO3 -, The seasonal cycle of NO3 - is similar to that of210Pb and distinctly different from that of7Be and MSA. These results indicate that the major source of NO3 - over Antarctica is probably continental as opposed to stratospheric or marine biogenic.
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