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Biomedical subjects

D Tzvetkov

Publications and source records attributed to D Tzvetkov.

24 records · Page 2Linked to original sources

Tuberculosis of male genital system--myth or reality in 21st century.

To review literature and our clinical experience with tuberculosis (TBC) of male genital tract. To analyze the localization of the specific process, association with other forms of TBC and its impact on fertility. The study comprises 69 male patients, average age 40.32 +/- 1.64 years who were diagnosed to have TBC of genital system. All laboratory, imaging, immunological and biological methods for detection of TBC were used as well as sperm count in patients with fertile problems. Time to set up of the diagnosis was 1 day to 19 years (median 26.82 +/- 6.76 months). TBC of the epididymis was found to be present in 78.26% of all cases. In 68.12%, unilateral affection was evident and involvement of left and right sites were similar. In 40.58% of patients, different grade of sperm quality alterations were diagnosed. Almost one-third of cases showed co-morbidity and 36.24% association with TBC of other organs and systems. TBC of male genital tract has a considerable impact on fertility and still remains a challenging medical problem. There is a growing body of evidence that regardless of all measures we should ring the bell about the possibility of a new widespread of TBC. Strong efforts are mandatory especially in developing countries and countries in transition like Eastern European Countries. Management of the disease should involve measures in health promotion programs, medical education health policy makers, and international cooperation.

Adult↗

Vibration disease: plasma electrolytes and trace elements.

102 patients with vibration disease (mean age 46 +/- 7, length of service in different jobs using vibration tools 17 +/- 7 years) were studied. Plasma electrolytes and trace elements (sodium, potassium, calcium, magnesium, phosphorus, chloride, iron, copper, zinc, cobalt and manganese) and plasma osmolality were investigated, as well as some specific tests indicative of vibration exposure--cold provocation test, vibration sense, thermoasymmetry (left/right hand), skin electric resistance and hand and finger blood flow (Doppler-ultrasound sonometry). In a large number of patients increased values for the following variables were found--magnesium in 43%, zinc in 45%, cobalt in 57%, manganese in 70% and plasma osmolality in 66%. It is suggested that vibration affects mineral metabolism. However, these disturbances in mineral metabolism are secondary to other pathological changes in the body.

Adult↗

Congenital anorchism: diagnostic and therapeutic aspects.

Eight patients with congenital anorchism were examined and treated. Plasma LH, FSH, and testosterone concentrations and the saliva testosterone level were measured by RIA in 3 patients. The results showed a 2.75 times increase in LH level, a 1.66 times increase in FSH level, and hardly measurable serum and saliva testosterone amounts. A dynamic provocating test was applied in 4 patients by Pregnyl (2000 and 4000 IU) and the results showed absence of the gonads. The semen quality control manifested a low volume of ejaculate and aspermia. Scyntiscanning of 6 patients demonstrated no functional testicular parenchyma. Substitute androgen therapy in patients with diagnosed anorchism gave good results, which suggests that this treatment is appropriate and promising. Implantation of testiculo-prostheses by using silicon alloplastic material corrects the cosmetic defect and overcomes the physiological barrier caused by the biological inferiority complex.

Adolescent↗

Etiopathogenesis of cryptorchidism and male infertility.

A retrospective study was performed 2.60 +/- 1.14 years after ochidopexy on 124 patients with cryptorchidism. Complex spermatological, hormonal, and histomorphological investigations were carried out which demonstrated the existence of disturbances in the exo- and endocrine functions of the testes of these patients. The results juxtaposed to the ages when the orchidopexy was accomplished revealed the necessity of early surgical intervention prior to 5 years of age. After this age there were severe changes in the histomorphological characteristics of the testicular tissue.

Adolescent↗

hCG stimulation test for diagnosis of androgen deficiency.

A diagnostic-stimulation test with hCG (Pregnyl, Organon) was developed for demonstration of latent testicular deficit. The test was worked out on clinically healthy men and was used to diagnose cases of anorchidism and cryptorchidism. This stimulation test may be applied in clinical andrology as a noninvasive and highly sensitive method.

Adult↗

Vibration effects on fatty acid composition of organ and cell membrane lipids.

The influence of middle and high frequency vibrations (50 and 150 Hz) on the fatty acid pattern of structural lipids in white rat liver, kidney, heart, aorta and muscular tissue was studied in a 3-month experiment. The study also examined the fatty acid composition of phospholipids in erythrocyte cell membranes of workers occupationally exposed to vibrations and of patients suffering from vibration disease. Statistically significant changes in the per cent distribution of fatty acids were observed, which were more evident in the liver and kidney of experimental animals, and also after high frequency (150 Hz) vibration exposure. Changes in human subjects were greater in workers exposed to hand-arm vibrations and in patients suffering from vibration disease. Routine and more precise methods are needed to assess occupational risk via determination of the lipid metabolism state in workers exposed to vibrations and in patients suffering from vibration disease.

Adult↗