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Biomedical subjects

H Heynemann

Publications and source records attributed to H Heynemann.

44 records · Page 3Linked to original sources
PubMed1984

[Comparative temperature measurement by thermoprobes and infrared pyrometry in the rewarming of frozen kidneys using short wave generators].

Mini pigs' kidneys were frozen to -20 degrees C after initial hypothermic perfusion and cryopreparation with dimethyl sulphoxide. They were subsequently thawed out with short-wave radiation. During this procedure continuous temperature measurement is only possible using infra-red pyrometry without physical contact. After completion of short-wave irradiation at ca. 4 degrees C the surface and internal temperatures are measured with thermoelements. In comparison with measurement by thermoprobes, infra-red pyrometry proves to be quite practicable, with certain limitations. If a homogeneous distribution of temperature in the organ is assumed; the internal temperature could be calculated from the surface temperature. Also, continuous observation of temperature changes ist possible.

Animals↗
PubMed1982

[Ultrasonic Doppler methods of blood flow studies of the arterial circulation from the aorta up to the kidney parenchyma in animals].

The Doppler method of ultrasonography was used in experimental investigations to examine the circulator behaviour at various points in the arterial system in the retroperitoneum as fast as the kidney in animals with normal circulation. This enabled reproducible Doppler curves to be determined. It remains to be seen to what extent characteristic curve patterns exist for e.g. partial or subtotal vascular occlusion. For the future it will be especially important to determine the flow curves in the cortical region of the renal parenchyma as an area of small and very small vessels, for this can give us important information on the circulation of blood in the individual segments of the kidney.

Animals↗
PubMed1982

[Ultrasonic spectroscopic examinations of pathologically altered testes].

The sonographic differentation of solidly growing and displacing processes is discussed so far only with a high factor of insecurity. The ultrasonic spectroscopy makes it possible for an approximate differentation of the tissue in the experimental investigations in vitro by the reception of bioacoustic parameters. Certainly some questions are open in case of the different forms of neoplasia of the testes. The spreading of the impulse sound field in the tissue cannot be described exactly up to today, because of the indistinct acoustic qualities of the structure in the macroscopic and microscopic region. The clearing of the biophysical reciprocity between sound field and tissue stands in the foreground of the future investigations. The ultrasonic spectroscopy performs despite of the open problems a constructive share to the findings in pathological processes of the testes.

Humans↗
PubMed1977

[1st experiences with the ultrasonic-Doppler-method in the diagnosis of testicular torsion].

In some cases the differential diagnosis of the torsion of the testicles may be difficult also for the experienced clinician. It is reported on a new method of the delimitation of the torsion of the testicles compared with inflammatory changes of the testicles and the epididymis. By means of the ultrasound-Doppler-method the blood supply of the vasa spermatica is registered. Missing Doppler-signals in the direct measurement above the spermatic cord in comparison to the collateral side are typical for a complete torsion of the testicles.

Doppler Effect↗