Library

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    ISSN: 1432-2013
    Keywords: Altitude ; Myocardium ; Regional blood flow ; Blood volume ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Circulating blood volume, cardiac output and relative organ perfusion changes were studied, using the Sapirstein method of86Rb tissue uptake, in male 75-day-old rats exposed to intermittent high altitude hypoxia (gradually up to 7000 m, 4 h daily, 5 days a week; the total number of exposures was 24). Intermittent hypobaric exposure caused a significant rise of the erythrocyte volume, whereas the plasma volume remained unchanged. The relative perfusion of the left and particularly of the right ventricular myocardium, as well as of the spleen, liver, lung, small intestine and skeletal muscle, was significantly higher. The cardiac output determined in other experimental animals similarly treated was significantly higher after 24 exposures to the intermittent high altitude hypoxia. We suggest that these changes are triggered by tissue hypoxia and a greater blood flow demand.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-1750
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The authors compare two methods of overexertion of the cardiopulmonary system, namely by a unilateral occlusion of the pulmonary artery and by muscular exercise. The two methods were always used both in one and the same person in the framework of one investigation by catheterization. The tests were performed in a group of 9 persons. The reactions to the two tests not identical and differed in size, quality and localization of the pathological findings. The authors further mention three cases: A woman patient with a normal lung finding, a man patient with a predominantly unilateral lesion affecting the entire lung wing for whom a greater load was represented by the muscular exercise, and finally a woman patient with a bilateral affection of the lung parenchyma, where on the other hand the values measured were less favourable with the occlusion. The observations made indicate that occlusion is more serious for those patients in whom in case of a more extensive restriction of the pulmonary bed there is eliminated from perfusion the lung parenchyma in which an exange of blood gases still takes place. If the part of the lung eliminated by the occlusion is damaged and is no longer of considerable importance for the respiration, it is, on the other hand, muscular exercise as a rule that means a greater strain, particularly when most of the blood flows through other parts of the lungs anyway, even prior to the occlusion. In case of hypertension there rather takes place an increased rate of flow with a rising minute volume of the heart.
    Notes: Zusammenfassung Die Autoren vergleichen zwei Methoden der Belastung des kardiopulmonalen Systems: die einseitige Pulmonalisokklusion und die Muskelarbeit. Sie benützen beide Methoden bei einer und derselben Person im Rahmen einer Katheterisationsuntersuchung. Diese Prüfungen wurden bei einer Gruppe von 9 Personen durchgeführt. Die Reaktionen auf beide Untersuchungsmethoden waren ungleich, sie unterschieden sich nach der Größe, der Qualität und der Lokalisation der pathologischen Veränderungen. Die Autoren erläutern das an 3 Fällen, einer Kranken mit normalem Lungenbefund, einem Patienten mit überwiegend einseitiger Schädigung des ganzen linken Lungenflügels, für den die Muskelarbeit größere Belastung bedeutete, und schließlich einer Patientin mit beiderseitig geschädigtem Lungenparenchym, wo die größere Belastung bei der Okklusion entstand.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 144 (1990), S. 151-160 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A simple method for labelling fatty acids with iodine radionuclides is reported. 16-[123I]iodohexadecanoic, 17-[123I]iodoheptadecanoic and 18-[123I]iodooctadecanoic acids were prepared by exchange reaction in ethanolic solution. The best results in biodistribution studies were obtained with 18-[123I]iodooctanoic acid.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1619-7089
    Keywords: Ischemic heart disease ; Gated radionuclide ventriculography ; Regional left ventricular motility injury ; Fourier analysis ; Factor analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Left ventricular phase and amphlitude images (Fourier analysis, PAI) and factor analysis images (FAI) from gated radionuclide ventriculography were obtained in 235 patients after myocardial infarction (MI) and in 44 patients with well documented ischemic heart disease (IHD) in order to assess areas of regional left ventricular motility injury (LVMI). The sensitivity of FAI for LVMI detection was higher than with PAI (36.3% vs 22.7% in patients without MI; 76.6% vs 68% in those after anterior MI; and 53.2% vs 31.9% after posterior MI, respectively). In 2.9% of all patients PAI were unclear due to small time activity amplitudes and heart rate irregularity, whereas FAI could be easily assessed. Significantly decreased left ventricular ejection fraction was observed predominantly after anterior MI in connection with distinct signs of LVMI in a large area of anterior wall or in the anteroseptal and/or apical region. Areas of LVMI could be sharply delineated in FAI; however, in contrast to PAI, FAI is unable to distinguish between dyskinetic and akinetic regions. The use of both PAI and FAI is recommended for more detailed detection of regional LVMI in patients with IHD.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of nuclear medicine 8 (1983), S. 288-291 
    ISSN: 1619-7089
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The uptake of 42K, 86Rb and 201Tl by non-ischaemic and ischaemic myocardium was determined in rats with coronary artery ligature lasting 10, 30, 60 and 120 min, and in control rats without ischaemia. Whereas the myocardial concentration of 201Tl and 42K in control rats was similar and higher than that of 86Rb, 201Tl was superior to the other two radionuclides due to its significantly higher accumulation in non-ischaemic myocardium and the higher ratio of non-ischaemic to ischaemic radioactivity. The 86Rb accumulation in non-ischaemic myocardium and non-ischaemic/ischaemic ratio began to decrease from its maximum at 10 min. 201Tl, 42K and 86Rb blood levels in intact animals decreased rapidly after intravenous injection to low and nearly stabilized values at 5 min. Na+K+-ATPase activity in the ischeamic myocardium was high in the acutely ischaemic myocardium and decreased to below control levels after 4 h of ischaemia; changes in activity could not influence the low uptake of potassium analogues in fresh ischaemic myocardium.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...