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PubMed · 5333062

[Capillary resistance--study methods and possibilities for clinical application].

D Voigt·G Brüschke
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D Voigt, G Brüschke. 1966-07-14. [Capillary resistance--study methods and possibilities for clinical application].. https://pubmed.ncbi.nlm.nih.gov/5333062/

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PubMed1997

The resistance to flow of individual human neutrophils in glass capillary tubes with diameters between 4.65 and 7.75 microns.

OBJECTIVE: The resistance to flow of individual human neutrophils flowing through smooth-walled glass capillary tubes at velocities ranging between 0 and 30 microns/s is measured for six different capillary tube diameters between 4.65 and 7.75 microns. METHODS: The experiments were performed with a micropipet manipulation system. The velocity of individual human neutrophils was measured under different constant pressures and compared to the velocity of the cell-free fluid in the same tube. With the aid of a theory that describes the motion of a concentric smooth-walled, sausage-shaped body in a tube, the experimental measurements are used to calculate an apparent gap width between the cell and the capillary wall. RESULTS: The maximum calculated gap width in the larger capillary tubes was on the order of 0.1 micron, whereas the minimum gap width in the smaller capillaries was about 0.015 micron. These small gap widths mean that even one neutrophil can cause a significant increase in the apparent viscosity when a cell flows through 100- to 200-micron-long capillary tubes. The neutrophils often exhibited a small static friction that tended to increase as the capillary diameter decreased. Maximum values for the adhesive force caused by the static friction were on the order of 80 pN. CONCLUSIONS: Even a single white cell entirely within a capillary can cause a significant increase in the resistance of flow.

Capillary Resistance↗
PubMed1990

[Parrot's method of angiostereometry in the evaluation of the status of chronic venous disease].

The authors present the results of capillary resistance measurements (CR) in three groups of examined subjects: with postthrombophlebitic syndrome, in patients with primary varicosis and in examined subjects which comprised the control group. We started from the fact that in more severe clinical conditions within venous insufficiency there also develop severe consequent conditions with the liberation of inflammatory reaction mediators in a greater extent than in the less severe cases and the assumption that in such patients CR is also lowered in the distant parts of the body. Angiostereometry by Parrot was the used technique. A total of 200 hundred persons was investigated. The examined subjects were divided into three groups. In group I there were 80 persons, all with the postthrombophlebitic syndrome which had the CR mean value of 15.26 cmHg (20.3 kPa). In group II there were 60 patients with primary varicosis, and the mean value of their CR was 17.7 cmHg (23.6 kPa). Group III had 60 examined subjects which comprised the control group, and their CR mean value was 19.90 cmHg (26.5 kPa). The difference was statistically significant. Capillary resistometry by Parrot is a very convenient method for the follow up and evaluation of clinical conditions of many diseases, as well as the follow up of therapy results. Due to all of its advantages it is superior to all stoppage methods such as Rumpel-Leed, for example.

Capillary Resistance↗