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Biomedical subjects

A Vajda

Publications and source records attributed to A Vajda.

At least 19 recordsLinked to original sources
PubMed2001

Uraemic gangrene syndrome: is parathyroidectomy always necessary?

This report presents a case of uraemic gangrene syndrome with multiple ulcerations and calcium (Ca) deposits in the vessel walls. High-dosage oral calcium carbonate (CaCO3) treatment alone resulted in rapid wound healing with decreased serum phosphorus (P), Ca x P product and parathormone and only slightly increased Ca levels. We suggest that this should be the first choice of treatment in such cases because positive clinical response can achieve symptom-free status for the patient until kidney transplantation, thus making parathyroidectomy unnecessary.

Adult↗
PubMed2000

Optically induced periodic structures in smectic-C liquid crystals.

We explore periodic structures of smectic-C (SmC) liquid crystals, induced optically by a polarization grating. The studied cells contain a passive surface of rubbed polyimide and an active photosensitive substrate of azo-dye doped polyimide. In a nematic phase the director field can be periodic independent of the angle between the grating vector and the rubbing direction. In the SmA phase periodic structure can be induced only by layer undulations. The SmC behaves similarly to the nematic phase, but the director can rotate only on a cone, which results in a more complex geometry. The periodic pattern is superimposed with four different director and layer structures. In spite of the coexistence of the nonuniform structures the diffraction efficiency is better in the SmC, than in the nematic phase.

Journal Article↗
PubMed2000

Bilateral ossification in the Achilles tendon: a case report.

Bilateral symmetrical Achilles tendon ossification is presented, with a fracture on one side. A 57 year old male patient was conservatively treated for bilateral clubfeet in his childhood. Part of his Achilles tendons were replaced by ectopic bony mass and on the left it fractured without any trauma. The fracture was treated surgically by vertical thinning, intraosseal suture "osteosynthesis", and tendon flap plasty. This pathological condition healed in three months. Seven years after the operation the X-ray revealed total bony rebuilding. The ectopic bone mass has the same biological behaviour as the anatomic bones.

Achilles Tendon↗
PubMed1998

Endoscopic laser foraminoplasty on the lumbar spine--early experience.

Since April 1995 this endoscope assisted laser technique has been used for widening the lumbar exit route foramina. Patient selection included individuals with primarily unilateral sciatica as well as low back pain and referred buttock pain following various operative interventions. Endoscopic laser foraminoplasty (ELF) utilises an endoscope, a uniportal posterolateral approach and a side firing holmium laser probe. Under direct vision and within the protection of saline solution, epidural scarring, extruded and sequestrated disc protrusions and/or osteophytes are removed by holmium laser ablation. The patient is responsive and aware under neurolept analgesia and this ensures the protection and the integrity of the nerve root. A total of 219 such interventions has been performed up to January 1, 1997. The first 48 cases with a follow-up exceeding 12 months have been included in this preliminary review. Initial experience is encouraging. The ELF seems to provide another means of addressing sequelae of primary degenerative disorders as well as the common consequences of conventional spine surgery. ELF provides an alternative to minimal intervention fenestrectomy and open surgical undercutting for predominantly unisegmental and unilateral lateral recess stenosis and in selected cases it may prevent or delay the indication of spinal fusion.

Adult↗
PubMed1994

[Idiopathic heterotopic ossification].

Three cases of localized, benign heterotopic ossification, occurred in the hip joint region, are presented. The aspects of the pathogenesis, differential diagnosis and prognosis are briefly discussed.

Diagnosis, Differential↗
PubMed1989

[Effect of previous surgery on the results of total arthroplasty of the hip joint].

Clinical and radiological results as well/as complications after 123 total hip arthroplasties performed as secondary procedure have been evaluated. These patients underwent primary operation because of femoral neck fracture or intertrochanteric osteotomy in the treatment of hip osteoarthritis. The scores of clinical results according to the Merle d'Aubigené and Postel scale were as follows: pain 4.48, walk 3.99, movements 4.02. Radiological features of loosening of the cup were observed in 14.4 per cent and of the stem in 17.3 per cent of those investigated. Early infections were 3 times higher and summed with late infections constituted 8.8 per cent of those operated on. Deep infections and aseptic loosening caused revision in 11.5 per cent of those investigated.

Adult↗
PubMed1978

[Effect of direct current on bone regeneration].

The data on bone biocurrent and on the bone regenerating effect of low intensity direct current are discussed. The stimulator constructed by the authors is described. With its help an improved callus formation could be achieved on the osteotanised femur of the rabbit.

Animals↗