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Biomedical subjects

I Oliva

Publications and source records attributed to I Oliva.

At least 37 records · Page 2Linked to original sources
PubMed1979

Capillary diffusion capacity for I-131 and capillary filtration rate in female patients with idiopathic oedema.

In female patients with idiopathic oedema the capillary filtration rate and capillary diffusion capacity for I-131 were studied in lower-limb muscles and subcutaneous tissue. The capillary filtration rate averaged 0.276 ml/100 ml per minute, and the capillary diffusion capacity for I-131 averaged 9.8 mol/(mol/ml) per 100 g per minute in the gastroonemius muscle and 8.7 mol/(mol/ml) per 100 g per minute in the lower-limb subcutaneous tissue. All of these figures are statistically significantly higher than the corresponding control findings. The results are compatible with the concept of disturbed capillary permeability, and etiopathogenetic factor of idiopathic oedema.

Adolescent↗
PubMed1978

Capillary filtration during postischaemic hyperaemia in human limbs.

The rate of capillary filtration after 5 minutes' ischaemia of the lower limbs was studied in man by the venous occlusive plethysmography method. The measured values were 3 times lower on an average than the control values. Comparison of the plethysmographic curves with isotope recordings after the intravenous administration of In-113m shows that volume changes induced by venous occlusion during reactive hyperaemia take place mainly intravascularly and do not allow any conclusions to be drawn on changes in blood-tissue fluid shifts.

Adult↗
PubMed1978

Impedance of the arterial system in terms of Fourier harmonic analysis of the pulse wave.

The results obtained by analysis of pulse waves by means of Fourier harmonics in healthy subjects and patients with aortic insufficiency show good agreement between input impedance of the aorta and the initial segment of the femoral bed in both groups. This means that in this region there is no marked increase in impedance, which provides a favourable background for energy transfer (blood content) in the distal direction. Impedance in healthy subjects increases in vessels of the lower extremity. In patients with aortic insufficiency there is a marked decrease in amplitude of all higher harmonic frequencies. This practically means that the second harmonic is no longer the main accumulator of energy of the pulse wave as in healthy subjects, and the same is also true, to a proportionate degree, for the third, fourth and fifth harmonics.

Aortic Valve Insufficiency↗
PubMed1977

The effect of hydroxyethylrutosides on capillary filtration rate in the lower limb of man.

The rate of capillary filtration in the lower limbs after hydroxyethylrutosides administered in various doses and by different routes was studied in patients with chronic venous insufficiency. Capillary filtration rate decreased immediately after intravenous and from 55 to 85 minutes after oral administration, depending on the dose. The slow-release tablets produced a definite falt in capillary filtration 240 minutes after administration.

Administration, Oral↗
PubMed1976

Evaluation of pulse wave morphology by Fourier's harmonic analysis: methodological procedure and results of a physiological test.

Evaluation of the pulse wave on five segments of the lower limb by means of Fourier's harmonic analysis showed that the following phenomena can be observed in resting (recumbent) healthy subjects: 1) Almost constant, marked accentuation of the amplitude of the second harmonic in every single spectrum. Tjis can evidently be attributed to the resonance properties of the arterial pathway, as a mechanical oscillating circuit; 2) Distinct dimunution of the amplitudes of further, higher harmonics; 3) When studying the reciprocal amplitude ratio in every single harmonic, from the proximal to the distal segment of the limb, we can observe striking relative augmentation of amplitude in a distal direction, as a manifestation of mounting impedance towards the periphery. This provides good conditions for the prevention of rebounds and of undesirable stationary waves.

Adult↗
PubMed1975

[Evaluation of the pulse-wave form by means of the harmonic Fourier-analysis in aortic valve insufficiency].

The most conspicious phenomenon in frequency spectra of pulse waves obtained in the lower extremity in aortal insufficiency is generally predominating decrease of amplitude in higher harmonic frequencies manifesting itself by progressively rising number of the harmonic. This suggests that the second harmonic is no longer the main energy bearer of the pulse wave as this is the case in healthy individuals. This is the case also, to a proportionate degree-measure, in third, fourth and fifth harmonic frequencies. Moreover, relative increase of the amplitude of each harmonic during the passage of the pulse wave across the artery distally is depressed. This may be considered as a weakening of the increase of impedance of arterial flow towards the periphery as compared with findings made in healthy individuals.

Adult↗