PubMed Health⌕ Search

Biomedical subjects

A Swarup

Publications and source records attributed to A Swarup.

12 recordsLinked to original sources
PubMed1996

Radial nerve palsy caused by injections.

Fifty-six cases of radial palsy due to injections have been seen during the last 13 years. Thirteen patients recovered spontaneously. Seven patients were treated by neurolysis, of which five had full recovery in 1 year. The remaining patients were treated by modified Robert Jones transfers. In ten cases flexor carpi ulnaris was spared as a strong flexor of the wrist, which improved the results in heavy manual workers. Radial nerve palsy caused by injection is an avoidable injury. There is a need for proper training of paramedical workers.

Adolescent↗
PubMed1993

A new surgical technique for old ununited lateral condyle fractures of the humerus in children.

It is difficult to achieve an anatomic reduction of old lateral condyle humeral fractures in spite of extensive excision of fibrous tissues from the condylar fragment. The long-standing displaced position of the condyle is responsible for the contracture of the origin of the common extensor tendon, which prevents anatomic reduction. In our technique, lengthening of the common extensor origin was done and anatomic reduction achieved. This technique has been tried successfully in 15 cases of neglected fractures of lateral humeral condyles in children.

Child↗
PubMed1991

Dielectric properties of mouse MCA1 fibrosarcoma at different stages of development.

The in vitro bulk electrical properties of MCA1 fibrosarcoma induced in C57B1/6 male mice were measured at frequencies of 10 kHz to 100 MHz, with some tissues measured to 2 GHz. The properties of normal surrounding tissue also were measured. A comparison of the dielectric properties between three different stages of tumor development as well as that between various locations within the tumor is reported. Statistical analysis of the experimental results revealed statistically significant differences in the dielectric constant and conductivity of the tumor tissues at various stages of development as measured at frequencies below 10 MHz. Conductivity values at different stages also differ at a frequency of 100 MHz. At other frequencies these differences were found to be statistically insignificant.

Animals↗
PubMed1987

In vitro dielectric properties of human tissues at radiofrequencies.

In vitro permittivity measurements of excised human liver, spleen, kidney and cardiac muscle at frequencies from 10 kHz to 100 MHz are described. An end-of-the-line capacitive sensor and a computer-controlled network analyser HP 3577 were employed. The results were compared with human data reported by other investigators as well as with the animal (cat) data obtained earlier in this laboratory. It was found that the conductivity of most of the human tissues tested was significantly higher than that of the animal tissues for the test frequencies. The dielectric constants for human kidney and spleen are higher than the corresponding animal (cat) tissues at frequencies from 10 kHz to approximately 1 MHz and at around 100 MHz. However, the values for liver do not differ significantly between the two species in the same frequency range.

Animals↗
PubMed1986

Postmortem changes of the dielectric properties of bovine brain tissues at low radiofrequencies.

The dielectric properties of the bovine brain grey and white matter in the frequency range from 20 kHz to 100 MHz were measured at different times following animal death. Changes in the dielectric parameters versus time are interpreted in terms of the reduction of the cell volume fraction that results from either cell disintegration or cell size reduction. Good agreement between the computer fitted parameters and the values calculated from the Maxwell-Wagner model of the static dielectric constants was found. At frequencies above 1 MHz the changes of the dielectric properties are less pronounced, confirming earlier observations made by other investigators for different species.

Animals↗
PubMed1986

In vivo and in vitro dielectric properties of feline tissues at low radiofrequencies.

The dielectric constant and conductivity of muscle, liver, spleen and kidney of cats in vivo and in situ immediately following the animal's death were measured at frequencies from 10 kHz to 100 MHz. A novel multi-ring capacitive sensor and a computer-controlled automatic network analyser (ANA) were employed. The results were compared with the data available from literature for the same species in the frequency range between 10 and 100 MHz. It was found that at frequencies from 10 to 100 kHz the in vitro dielectric constant for all tissues except spleen was smaller than the in vivo one. In contrast, in the range from 1 to 100 MHz the in vitro dielectric constant was larger than the in vivo one. At intermediate frequencies from 0.1 to 1 MHz both the dielectric constant in vivo and in vitro were the same within the experimental uncertainty. The dielectric constant of the spleen in vivo was quite similar to that in vitro. The in vivo conductivity of all tissues appeared to be higher than in vitro from 10 kHz to 10 MHz, while at frequencies above 10 MHz the two conductivities were within the experimental uncertainty.

Animals↗
PubMed1985

Radiofrequency dielectric properties of animal tissues as a function of time following death.

The dielectric properties of three bovine tissues, liver, kidney and spleen, as a function of time following death, were measured in the frequency range from 20 kHz to 100 MHz using an automatic network analyser and an end-of-the-line sensor. The dielectric constant of kidney and spleen decreases as a function of time following death, particularly at frequencies below 1 MHz. However, all tissues measured show a characteristic increase in the frequency-independent ionic conductivity. This is believed to reflect changes in the conductivity of the extracellular region of tissues after death. The dielectric parameters, i.e. the static dielectric constant, the relaxation time and the coefficient of the relaxation time distribution, obtained by a curve-fitting process, do not change within the first 10 h following death in the case of liver, whereas early changes occur for both kidney and spleen. High initial values of the static dielectric constant for these tissues decrease significantly within a few hours following death. Similarly, the relaxation time which is relatively long for kidney and spleen, as compared with liver, decreases with time. Our data compare favourably with those reported by several investigators for similar tissues in other species (dog, cat, swine and cattle).

Animals↗