GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 82.30.Nr  (3)
  • Belastungsuntersuchungen  (1)
  • Blood dilution  (1)
Document type
Keywords
Publisher
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Chirurg 70 (1999), S. 664-673 
    ISSN: 1433-0385
    Keywords: Key words: Bronchial carcinoma ; Lung resection ; Lung function testing ; Excercise testing ; Pulmonary hemodynamics. ; Schlüsselwörter: Bronchialcarcinom ; Lungenresektion ; Lungenfunktion ; Belastungsuntersuchungen ; pulmonale Hämodynamik.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Die Lungenresektion bietet die beste Aussicht auf ein langfristiges Überleben von Patienten mit nichtmetastasierten pulmonalen Neoplasien. Angesichts der schlechten Prognose von Patienten mit nichtreseziertem Bronchialcarcinom sollte auch bei reduzierten kardiopulmonalen Reserven die Lungenresektion angestrebt werden. Dies bedingt eine sorgfältige Abschätzung der postoperativ zu erwartenden kardiopulmonalen Funktion, um einerseits keinem Patienten eine potentiell kurative Therapie zu versagen, andererseits aber auch schwerwiegende postoperative Beeinträchtigungen zu verhindern. Die Ursachen postoperativer Morbidität und Letalität sind vielfältig. Demzufolge kann nicht anhand einzelner Lungenfunktions- oder hämodynamischer Parameter eine genaue und zuverlässige Vorhersage postoperativer Komplikationen vorgenommen werden. Die Kriterien der Operabilität sollten anhand von Sollwerten der Parameter definiert werden, da hierdurch Alter, Geschlecht und Größe des Patienten berücksichtigt werden. Belastungsuntersuchungen bieten den Vorteil, daß gleichzeitig pulmonale und kardiale Risiken erfaßt werden. Der hohe prädiktive Wert der maximalen Sauerstoffaufnahme (VO2max) zur Abschätzung der postoperativ zu erwartenden Morbiditäts- und Letalitätsrate ist belegt. Wichtig ist die Abschätzung der postoperativ zu erwartenden Lungenfunktion (ppo). Unter Verwendung derselben Formel können die postoperativen Werte des Einsekundenvolumens (FEV1-ppo), des Transferfaktors (TL,CO-ppo) und vermutlich auch von VO2max-ppo abgeschätzt werden. Patienten, bei denen eine annähernd normale Lungenfunktion (FEV1, TL,CO 〉 75 % Soll) vorliegt sowie begleitende kardiale Erkrankungen fehlen, können ohne weitere Diagnostik einer Lungenresektion bis hin zur Pneumonektomie zugeführt werden. Trifft dies nicht zu, müssen zunächst durch Berücksichtigung der zu resezierenden Segmente die postoperativ zu erwartenden Werte für FEV1-ppo und TL,CO-ppo abgeschätzt werden. Liegen diese unter 30 % Soll, ist der Patient in der Regel als inoperabel anzusehen, bei Werten 〉 40 % Soll kann ohne die Notwendigkeit weiterer Diagnostik funktionelle Operabilität konstatiert werden. VO2max 〈 10 ml/kg/min oder 〈 40 % Soll verbieten einen lungenresezierenden Eingriff. Beträgt VO2max hingegen 〉 20 ml/kg/min oder 〉 75 % Soll, liegt Operabilität ohne Einschränkung vor. Mittels quantitativer Lungenszintigraphie können FEV1-ppo, TL,CO-ppo und VO2max-ppo errechnet werden, falls weiterhin diagnostische Unsicherheit verbleibt. FEV1-ppo- und TL,CO-ppo-Werte 〈 30 % Soll bzw. VO2max-ppo 〈 8 ml/kg/min oder 〈 35 % Soll sind in der Regel mit funktioneller Inoperabilität gleichzusetzen.
    Notes: Summary. Lung resection offers the best prospect of long-term survival in patients with nonmetastatic pulmonary neoplasia. In view of the dismal prognosis of unresected bronchial cancer, surgical resection should be encouraged even in patients with reduced cardiopulmonary function. Accurate estimation of the postoperative cardiopulmonary function is therefore desirable to avoid (a) refusal of potentially curative treatment and (b) severe postoperative disability. The origins of postresection morbidity and mortality are multifactorial. Thus, no single pulmonary function test or hemodynamic measurement can accurately and reliably predict postoperative cardiorespiratory complications. Criteria of functional operability should be based on percent of predicted value, so that patient's age, sex, and height will be taken into consideration. Exercise testing offers the advantage that both pulmonary and cardiac risk can be evaluated simultaneously. The high predictive value of maximal oxygen uptake (VO2max) in assessing postoperative morbidity and mortality is established. The calculation of predicted postoperative lung function (ppo) is of importance. The postoperative values for the forced expiratory volume in one second (FEV1-ppo), the transfer factor (TL,CO-ppo), and VO2max-ppo can be predicted by using the same formula. Patients with nearly normal lung function (FEV1, TL,CO 〉 75 % predicted) and no concomitant cardiac disease can undergo lung resection right up to pneumonectomy without further diagnostic procedures. In the others, FEV1-ppo and TL,CO-ppo should be estimated first by taking into account the number of segments to be resected. Patients with values 〈 30 % predicted are usually regarded as being inoperable, whereas values 〉 40 % predicted qualify for resection without the need for further diagnostics. VO2max 〈 10 ml/kg/min or 〈 40 % predicted are prohibitive for surgery. If VO2max is 〉 20 ml/kg/min or 〉 75 % predicted, functional operability without limitation is given. For those cases where diagnostic uncertainty still remains, FEV1-ppo, TL,CO-ppo, and VO2max-ppo can be calculated by means of quantitative lung scans. Patients with either FEV1-ppo and TL,CO-ppo 〈 30 % predicted or VO2max-ppo 〈 8 ml/kg/min or 〈 35 % predicted are deemed inoperable.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1440
    Keywords: Hematocrit ; Hematocrit determination ; Blood dilution ; Blood transfusion ; Hämatokrit ; Hämatokritbestimmung ; Blutverdünnung ; Bluttransfusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei Blutverdünnung wird der Hämatokrit mit dem elektronischen Mikro-Hämatokritgerät niedriger gemessen als mit der Hämatokritzentrifuge. Die Abweichung von dem zu erwartenden Wert beträgt bei 30,0% Hämatokrit etwa 3,5 und bei 20,0% Hämatokrit etwa 6,5 absolut-%. Für die Indikation zur Bluttransfusion muß der aus der elektronischen Leitfähigkeit des Blutes ermittelte Hämatokrit nach der Formelx=0,792y+9,277 korrigiert werden.
    Notes: Summary Hematocrit determinations in the course of hemodilution extracorporeal circulation experiments were carried out by both electronic means (YSI type 30) and by standard centrifuge techniques In 8 dogs, 56 comparative measurements were made. The electronic technique gave a consistently low reading. At a true hematocrit of 30,0% the instrument consistently read 26,5% and at true hematocrit level of 20,0% the machine read 13,5%. The scale is corrected electronically according to the formula:x=0.792y+9.277.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 10 (1988), S. 279-290 
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 33.80.Eh ; 82.30.Nr ; 82.40.Dm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutral Na·(H2O) n clusters are studied by near-uv one-photon ionisation and time-of-flight mass spectroscopy. The clusters are formed in a “pickup source” by injection of a beam of Na atoms into the expansion zone of a pulsed nozzle beam of water vapour seeded into an argon carrier gas. The performance of this novel technique for studying cold aggregates of potentially reactive species is discussed in detail. The photoion efficiency (PIE) spectrum of the monomer near its ionisation threshold (4.379(2) eV) shows a rich structure. Vibrational frequencies of the ion can be deduced and some indication of molecular Rydberg states is seen. Ionisation potentials for larger clusters and the binding energies of the neutral clusters up ton=5 are reported.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 32 (1995), S. 311-320 
    ISSN: 1434-6079
    Keywords: 82.30.Nr ; 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first reactive differential scattering study for atomic clusters is reported. Oxidation of Na x (x≦8) with O2 is investigated in a crossed beam apparatus. Sodium oxide (Na n O,n≦4) and sodium dioxide (Na n O2,n≦6) are produced with a total reactive cross section from 50 to 80 Å2, depending on the cluster size. The excess energies for these reactions are estimated by an SCF type ab initio calculation and range from 0.5 to 5 eV. The large cross section may then be understood quantitatively in terms of a harpooning mechanism as a first step in the reaction path. Angular distributions have been determined for the most abundant products, showing strong forward scattering. Two different schemes are discussed for the reaction: while the dioxides Na n O2 may be formed by an evaporative cooling process from a highly excited collision complex, formation of Na n O appears to originate from a direct process. In both cases the experimental data suggest that most of the exothermicity remains in the reaction products.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 20 (1991), S. 65-67 
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 33.80.Eh ; 82.30.Nr ; 82.40.Dm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutral sodium ammonia clusters are formed in apickup source by injecting a beam of sodium atoms into the expansion zone of a pulsed nozzle beam of neat ammonia gas. The clusters are studied by one-photon ionisation in the range of 266 nm to 500 nm with pulsed lasers and Time-of-Flight mass spectroscopy. Na(NH3) n cluster ion signals up ton=35 are observed. The ionisation potentials of complexes up ton=9 are reported.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...