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Biomedical subjects

Z Voldrich

Publications and source records attributed to Z Voldrich.

At least 19 recordsLinked to original sources
PubMed1990

[Reconstructive procedures in war injuries of the larynx and trachea].

In recent years the authors operated three casualties from non-European battlefields with severe laryngotracheal stenoses due to war injuries. Median laryngotomy (thyrocricotracheotomy) made a revision and modification of the internal injury possible. An implanted tube from a vascular prosthesis, packed in Hydron kept the replaced cartilaginous cross bar and possibly mucous grafts from a gingivobuccal fold in the correct position. A cross bar made from a cartilaginous or bony portion of a rib also dilated the lumen. It was kept in position by the perichondrium of the cartilaginous cross bar sutured to the margin of the mucosal remnants. All three patients were decannulated.

Humans↗
PubMed1990

[Diplopia in fractures of the orbital floor].

Based on their own experience with surgical treatment of 43 patients with fractures of the orbital floor, the authors discuss the problem of early operation in relation to the development of residual diplopia. They evaluate the functional result by the size of the visual field where diplopia occurred. In confirmed fractures of the orbit they recommend operation as early as possible after the injury. All patients were operated by the method of transantral reposition of the orbital floor. Satisfactory functional results were achieved in all operated patients. None of them had diplopia in the primary position of the eyes. The best results were achieved in patients operated early (residual diplopia in 10%), where none of the patients had diplopia in the visual field beneath 30 degrees.

Adult↗
PubMed1989

[Clinical experience with silastic middle-ear prostheses].

The authors made clinical tests of silastic prostheses of the middle ear, type PORP, TORP and piston. They used 29 X PORP, 26 X TORP and 21 pistons. They did not reveal any signs of tissue intolerance to Silastic MDX 44-516, which is used for making prostheses. They achieved satisfactory anatomical and functional results. They recorded an auditory gain in more than half the patients (early: PORP 97%, TORP 73%, piston 52%; plasty transplants of ossicles obtained from subjects who died accidentallyĕ For preserfic Council of the Ministry of Health, Czech Socialist Republic, recommended, based on the clinical tests, the manufacture of silastic prostheses of the middle ear.

Audiometry↗
PubMed1989

[Late results in the replacement of auditory ossicles with silastic prostheses].

Silastic prostheses of the middle ear proved useful in the reconstruction of the chain of auditory ossicles. Following an observation period of 6 months to 6 years they led in type PORP in a group of 49 subjects to early functional positive results in 78% and late positive results in 71%. The authors tested type TORP in 56 patients with a 57% success as regards early and late results. They used pistons only in obliterated fossae of the fenestra ovalis or in case of thick immobile plates. Despite this they achieved excellent and good early and late auditory gains in 58%. Of 105 prostheses type PORP and TORP administered during the entire observation period rejection occurred only in four subjects, i. e. in 3.8%. They inserted a strip of fascia between the cap of the prosthesis and tympanic membrane.

Follow-Up Studies↗
PubMed1989

A silastic prosthesis for total replacement of the middle-ear ossicular chain, its acoustic properties and clinical application.

The authors designed and made a prosthesis for total replacement of the middle ear ossicular chain (TORP) from Silastic MDX 44-516. A great advantage of this substitute is that it can easily be modified to a prosthesis for partial replacement of the middle-ear ossicular chain (PORP). The transfer properties of the PORP type prosthesis were verified by using an electroacoustic model measurement. Very good anatomical and functional results were obtained in the clinical testing of both types of middle-ear substitutes. No undesired reactions to the implanted polymer were observed.

Acoustic Impedance Tests↗
PubMed1975

Long-term experience with poly(glycol monomethacrylate) gel in plastic operations of the nose.

Between 1964 and 1970 the authors implanted Hydron gel in 62 patients with nose malformations. The cosmetic defects most frequently operated on were the saddle, and scoliosis of the nasal dorsum. By the end of 1973, 39 of the total number of cases were checked again. In two cases, the gel had to be removed shortly after the operation because of local inflammatory changes. No signs of hypersensitivity could be detected. Calcifications were detected by x-ray examination in 54.2% of the cases. Thirty-four of the patients subjected to the checkup were satisfied with the results of their operations. The authors considered the results to be very good in 16 cases, and unsatisfactory in 6 cases. Calcifications detected by x-ray examination did not affect the final cosmetic effect. None of the examined patients had any complaints in connection with long-term application of the gel. Hydron gel seems to be a suitable implant material in plastic operations of the nose.

Acrylates↗