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Biomedical subjects

K Nikolov

Publications and source records attributed to K Nikolov.

At least 19 recordsLinked to original sources
PubMed2001

[Frequency of antiphospholipid antibodies and Leiden mutation of hemostasis Factor V in unexplained recurrent fetal and embryo loss].

Object of the study are women with a history of unexplained recurrent embryo, fetal and early neonatal death, severe preeclampsia, fetal growth retardation, abruptio placentae, puerperal thromboses. Quite often placental insufficiency is linked to abnormal vascular system and hemostatic disturbancies. In about 65% of the women with a complicated and in 18% of the women with a normal pregnancy are observed different genetic anomalies that lead to a hypercoagulative state. A major place is taken by the Leiden mutation of hemostasis factor V, by protein C and protein S deficiency, etc. Another disease that leads to arterial and venous thromboses and is most often linked to recurrent miscarriage is the antiphospholipid syndrome. Many authors confirm the findings of large placental infarctions and thromboses in women who are positive for antophospholipid antibodies.

Abortion, Habitual↗
PubMed2000

Anticardiolipin antibodies in spontaneously hypertensive rats (SHR), stroke-prone SHR and normal Wistar rats.

1. Anticardiolipin antibodies (ACA) can be detected in the serum of patients with autoimmune disturbances, ischaemic heart disease, myocardial infarction, neurological disorders and other medical conditions. Elevated values of these autoantibodies can be associated with recurrent fetal loss, arterial and venous thrombosis and thrombocytopenia. 2. In the present study, we investigated the presence of ACA in three rat strains, namely normal Wistar rats (WR), spontaneously hypertensive rats Okamoto-Aoki (SHR) and stroke-prone SHR (SHRSP). All animals were examined at four ages: 1, 4, 10 and 12 months of age. Anticardiolipin antibodies were determined by ELISA. 3. Anticardiolipin antibody levels in normal WR, which were used as controls, were lowest at 1 month and increased significantly from the 4th month on. At the prehypertensive age (1 month), ACA levels in SHR and SHRSP were significantly higher compared with control WR, decreased with age and were significantly lower at 4, 10 and 12 months compared with age-matched WR. 4. These differences may be a result of immunological disorders in SHR.

Aging↗
PubMed2000

[Spontaneous abortions in Sneddon's syndrome].

Following the publications on the connection between Sneddon's syndrome and the antiphospholipid++ syndrome, the attention of researchers concentrated on the reproductive problems of women comprising the greater part of patients suffering from Sneddon's syndrome. One of the main indications of these almost coinciding syndromes are miscarriages for no obvious reason. It is supposed that the general mechanism is thrombosis. In a group of 38 patients with Sneddon's syndrome 32 (84%) are women. Twenty-eight of them have altogether given bright 43 times. Seven of them have suffered miscarriages for no obvious reason and three have habitual miscarriages. Three women have sterility problems.

Abortion, Habitual↗
PubMed2000

[Alpha-2 macroglobulin in serum and synovial fluid of patients with rheumatoid arthritis and osteoarthrosis].

AIM: To study concentrations of alpha-2-macroglobulin (A-2-MG) in blood serum and synovial fluid (SF) in patients with rheumatoid arthritis and formulation of basic clinical, laboratory and x-ray criteria of RA activity. MATERIALS AND METHODS: A-2-MG levels were measured in the serum and SF from 151 RA patients and in the serum of 20 patients with osteoarthrosis (OA) and 62 healthy donors. The serum concentration for RA patients was 166 +/- 65.3 mg%, for OA patients--175.26 +/- 36.99 mg% and for healthy donors--177.772 +/- 50 mg%. Mean concentration of SF A-2-MG in RA patients was 98.77 +/- 82.43 mg%. CONCLUSION: Changes in the concentration of A-2-MG are unrelated to inflammation activity in the joints of RA and OA patients. Serum and synovial concentration of this protein corresponds to changes in the concentration of IgM and rheumatoid factors in RA patients.

Arthritis, Rheumatoid↗
PubMed1999

Prevalence of IgM-, IgA- and IgG-rheumatoid factors in seronegative polyarticular disease compared to pauciarticular disease in juvenile chronic arthritis as measured by ELISA.

OBJECTIVE: To determine the prevalence of the rheumatoid factor isotypes measured by enzyme-linked immunosorbent assay (ELISA) in polyarticular and pauciarticular juvenile chronic arthritis (JCA), and evaluate the diagnostic test qualities. PATIENTS AND METHODS: 53 patients with JCA (20 with seronegative polyarticular disease at onset, 21 with pauciarticular onset and course of disease and 12 with extended pauciarticular disease), as well as 125 control children (58 healthy controls and 67 patients with other diseases) were tested. ELISA for the detection of IgM-, IgA- and IgG-isotypes of RFs was used. The diagnostic characteristics of the tests were evaluated by means of clinical epidemiology methods. RESULTS: The prevalence of the ELISA for IgG-, IgA-, and IgM-RF for JCA patients vs all controls at optimal cut-off titres was 13%, 29%, and 32%, respectively. The test for IgG-RF was established to be of no significance. IgA-RF had higher prevalence in the polyarticular and extended pauciarticular form, 40% and 33%, respectively. IgM-RF showed a prevalence of 55% for the polyarticular and 42% for the extended pauciarticular form. No significant prevalence has been found in the pauciarticular form. CONCLUSION: Our results indicate that ELISA for IgG-RF is of no diagnostic value for JCA. The ELISAs for IgM- and IgA-RFs demonstrated a diagnostic significance for the polyarticular and extended pauciarticular form. Juvenile chronic arthritis (JCA) is a heterogeneous disease which encompasses different forms defined by the type of onset. There is evidence, supported by immunogenetic studies that the various subgroups may represent distinct disease entities [1, 2]. Numerous immunological abnormalities have been detected in JCA, but the most characteristic serological findings are ANA and IgM-rheumatoid factor, thought to be useful in the classification of patients and their management. Antinuclear antibodies are universal in JCA, most commonly found in children with early onset pauciarthritis and late onset seropositive polyarthritis [1, 2, 3]. In contrast, the IgM-rheumatoid factor, measured by conventional agglutination techniques, is a hallmark only of polyarthritis with late onset resembling adult rheumatoid arthritis. This group of patients with "seropositive" disease represents less than 20% of all JCA children. Of those patients with "seronegative" disease 20-30% have a systemic onset and the remainder have either a pauciarticular or polyarticular form [2, 3]. Following the introduction of more sensitive techniques, it has already been established that rheumatoid arthritis (RA) patients' sera contain not only the "classical" 19S IgM-RF, but also other isotypes of the rheumatoid factor (RF). A number of studies have emphasized the presence of IgG-, IgA-, IgM- and even IgE- RF in patients with "seronegative" RA [4, 5, 6]. The aim of this study is to determine the prevalence of IgG, IgM and IgA RFs and to attempt at evaluating the diagnostic and prognostic qualities of the ELISA-tests for rheumatoid factor isotypes in polyarticular and pauciarticular forms at onset of JCA.

Arthritis, Juvenile↗
PubMed1996

Sperm, nuclear, phospholipid, and red blood cell antibodies and isotype RF in infertile couples and patients with autoimmune rheumatic diseases.

PROBLEM: To determine if measuring of nonorgan-specific autoantibodies is useful for better understanding and management of unexplained infertility. METHODS: Sera were obtained from 70 infertile couples, 57 rheumatic patients, and 76 fertile donors. Sperm antibodies (SA) were detected by the tests of Kibrick and Friberg, anti-histones, anti-cardiolipin antibodies, and RF isotypes by ELISA, antinuclear antibodies by indirect immunofluorescence, and anti-red blood cell antibodies by Capture-R. RESULTS: Multiple autoimmune reactivity (both partners positive and/or more than one type of autoantibody involved), higher than naturally occurring in fertile individuals, was found in 55% of the idiopathically infertile couples. IgA-RF was the dominant autoimmune marker. SA revealed similar rates in patients with rheumatic diseases and in infertiles with or without other autoantibodies. CONCLUSION: Although no single autoimmunity marker could predict occurrence of SA, the coincidence of enhanced polyclonal autoimmunity in both partners of infertile couples might potentiate their negative effect on reproduction.

Adolescent↗
PubMed1994

[A rare case of gallbladder interposition in the extrahepatic bile ducts].

This is a report on an exclusively rarely met with anomaly, consisting in interposition of the gallbladder within the extrahepatic bile ducts where ducti hepatici open into the gallbladder. Ductus cysticus assumes the role of ductus choledochus, and terminates in papilla duodeni major. Ductus hepaticus communis is completely lacking. The aforementioned anomaly of the biliary system in the female patient reported on is supplemented by a vascular variation, consisting in the following: a. hepatica dex. passes over the isthmus of the gallbladder, and after forming a kink it is directed to hilus hepatis. At the apex of the kink a. cystica divides with blood supply being secured by the latter and the branches of a. hepatica dex. A similar anomaly is described by Nell Krug (2), whereas J. Denes (1) reports on a case where only ductus hepaticus dex. opens into the gallbladder.

Aged↗
PubMed1990

[The postoperative changes in the cellular immune response in vivo in patients with colorectal carcinoma after preoperative acute normovolemic hemodilution--a randomized, prospective and comparative study].

The in vivo changes in the cell-mediated immune response (CMIR) were studied in 40 patients undergone planned operation for colorectal cancer; delayed skin hypersensitivity test was used after intracutaneous application of standardized set of antigens produced at the Research Institute of Infectious and Parasitic Diseases in Sofia. The tests were performed, as follows: T0--2 days before the operation; T1--1 and T2--7 days after the operation. The tests were read after 48 hours, taking into consideration the sum of the mean diameters of the "positive" papules (in mm) and the number of antigens inducing positive skin response. Twenty patients received preoperative acute normovolemic hemodilution (PANHD)--group A, and the other 20--blood substitution by routine method--group B, control. Comparison of the results for T0 revealed no significant difference between the two groups. For T1 and T2 the mean sums of the mean diameters of positive papules in group B patients showed statistically significant decrease (p less than 0.001) both compared to T0 and to the respective values in group A patients. The following conclusions were made: 1. After PANHD the patients retained normal CMIR after operation: 2. Patients who received homologous blood substitution had statistically significant inhibition of CMIR on the 7. postoperative day.

Adult↗
PubMed1990

[A modified technic of preoperative acute normovolemic hemodilution--the advantages and economic effect of its use in planned colorectal surgery].

In a prospective and comparative study were included 129 patients undergone planned operation for colorectal cancer. They were divided in two randomized groups: Group A consisted of 65 patients operated under conditions of preoperative acute normovolemic hemodilution (PANHD) by an own modified technique with Ringer-lactate and hemodex. Group B (control) included 64 patients operated with the use of homologous blood substitution. The results in the two groups were compared as to: intra- and postoperative blood transfusions; time (in days) of postoperative treatment; number of postoperative complications. Statistically significant differences (p less than 0.001) referrable to all three compared values were found. The modified PANHD technique in planned colorectal surgery is safer for the patients than the so far suggested techniques and may readily gain acceptance with the use of solutions of domestic produce. It leads to significant decrease in homologous blood transfusion, shortening the postoperative stay in hospital of patients subjected to hemodilution. The number of patients in whom postoperative complications developed was reduced.

Adult↗
PubMed1990

[Continuous thoracic epidural analgesia in surgical interventions on the upper half of the abdomen--the noninvasive monitoring of the early hemodynamic changes].

Operative interventions in the upper half of the abdomen have been performed in 32 surgical patients under thoracic epidural analgesia (TEA) with bupivacain at T4-L2 level, with the use of catheter technique. Before operation the patients were hydrated with 12.5 per cent of the circulating blood volume, calculated by nomogram. By noninvasive approach were monitored: pulse rate (PR), mean arterial pressure (MAP), minute cardiac volume (MCV), peripheral vascular resistance (PVR) and cardiac index (CI) for the following times; T0--basal preoperative value, T1--on the 5. min; T2--on the 10. min; T3--on the 15. min.; T4--on the 20 min.; T5--on the 50. min after application of bupivacain analgesia. The results were compared by variation analysis to T0. PVR was reduced with statistical significance for T2, T3 and T4 (p less than 0.01). MCV, CI and MAP tended to be reduced, while PR showed no significant changes. The results may be summarized, as follows: 1. Noninvasive monitoring of PR, MAP, MCV, CI and PVR in TEA is necessary for early detection and control of their pathologic changes; 2. The hemodynamic changes in TEA with bupivacain at T4-L2 level after premedication with vagolytic and hydration with Ringer-lactate (in amount 12.5 per cent of the circulating blood volume) are not significant and do not require additional treatment; 3, TEA at T4--L2 level allows performance of operative interventions in the upper half of the abdomen with adequate analgesia and relaxation, being particularly indicated for patients at risk.

Abdomen↗
PubMed1989

[Changes in the level of urinary secretory immunoglobulin A in patients with recurrent pyelonephritis].

The urine concentration of secretory immunoglobulin A was studied in 58 healthy persons (26 women and 32 men) and in 55 patients (44 women and 11 men) with chronic recurrent pyelonephritis before the beginning of the antibacterial treatment. An immunoenzyme method on a solid phase was used (ELISA). In 21 patients a lowered urine secretory immunoglobulin A level (IgA) was found, in 19 patients it was elevated and in 15 patients it was in normal ranges. In the group of patients with an elevated secretory IgA level the antibacterial treatment was successful in 89.5% of the patients while in the group of patients with a lowered secretory IgA level the treatment was successful only in 61.9% of the patients. In 12 patients the secretory IgA level was examined after the treatment and in 72.7% of them it was changed--in 38.2% of the patients the level was lowered and in 34.5% of the patients it was elevated. The local immune response of the organism against infections is discussed.

Adult↗
PubMed1988

[The level of factor VIII/von Willebrand and inhibitors in diabetic retinopathy].

In 28 diabetics, classified into two groups according to the presence or absence of diabetic retinopathy, the following indices were examined: glycohemoglobin, factor VIII/von Willebrand, alpha-I-antitrypsin and alpha-2-macroglobulin. Factor VIII/von Willebrand and alpha-2-macroglobulin showed no changes in diabetes mellitus. Alpha-I-antitrypsin was statistically significantly decreased (p less than 0.05). Glycohemoglobin was significantly increased. No statistically significant differences were found between the two groups of diabetic patients (with and without retinopathy) studied for all indices examined.

Adult↗