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Biomedical subjects

S Ozmen

Publications and source records attributed to S Ozmen.

At least 19 recordsLinked to original sources
PubMed2003

Role of reactive oxygen species in organophosphate insecticide phosalone toxicity in erythrocytes in vitro.

Reactive oxygen species (ROS) caused by organophosphates may be involved in the toxicity of various pesticides. Therefore, in this study we aimed to investigate how an organophosphate insecticide, phosalone, affects lipid peroxidation (LPO) and the antioxidant defence system in vitro. For this purpose, the effects of various doses of phosalone on LPO and the activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and catalase (CAT) in erythrocytes were studied. Each phosalone dose was incubated with a previously prepared erythrocyte sample at +4 degrees C for 0, 60 and 180 min. After incubation, the levels of malondialdehyde (MDA) and the activities of SOD, GSH-Px and CAT were determined. Phosalone caused an increase in MDA formation and a decrease in the activities of SOD, GSH-Px and CAT. However, these effects were seen only at extremely high concentrations of phosalone and these concentrations were in the lethal range. Therefore, we suggest that ROS may not involve in the toxic effects of the pesticidal use of phosalone in low concentrations.

Adult↗
PubMed2002

Tuberculin responses in children with allergic diseases.

BACKGROUND: The prevalence of allergic disorders has been increasing over the last 30 years, especially in developed countries. One factor associated with this rise may be the decline of many childhood infections. We investigated tuberculin responses in allergic children in order to see the development of delayed-type hypersensitivity reactions to tubercule bacillus infection. METHODS: The study sample was composed of 106 allergic and 100 nonallergic children vaccinated with bacille Calmette-Guerin (BCG). The standard Mantoux test was applied to all children. The reactions were read after 72 h by measuring the diameter of the wheal. RESULTS: The wheal size was 6.29 +/- 5.09 mm (mean +/- SD) in allergic children, and 2.79 +/- 2.96 mm in nonallergic children. The difference between the two groups was significant (P < 0.001). In children with a single BCG scar, the mean purified protein derivative (PPD) wheal size for allergic children was 4.77 +/- 4.79 mm, and for nonallergic children it was 2.48 +/- 3.19 mm. The mean PPD wheal sizes in allergic and nonallergic children who had been vaccinated twice were 8.35 +/- 4.80 mm and 3.33 +/- 2.44 mm, respectively. This difference was statistically significant (P < 0.05). In 27.35% of the allergic children and 6% of the nonallergic children, the positive tuberculin responses (PPD > or = 10 mm) were recorded. The difference was significant (P < 0.05). CONCLUSIONS: Our results showed that response to tuberculin in BCG-immunized allergic children is higher than in BCG-immunized nonallergic children.

Adolescent↗
PubMed2001

The effect of gradually increased blood flow on ischemia-reperfusion injury.

Even with excellent operative techniques, prolonged ischemic periods may cause unwanted results because of a complex mechanism called reperfusion injury. Various pharmacological and immunological agents have been used to prevent this type of injury. Another known way to diminish reperfusion injury is the gradual reperfusion of the ischemic tissues. In this study, the effect of a gradual increase in blood flow on ischemia-reperfusion injury of the skeletal muscle was investigated. The right hind limbs of 15 rats were partially amputated, leaving the femoral vessels intact. Preischemic femoral arterial blood flow was measured by using a transonic small-animal blood flowmeter (T106) in all animals. The rats were divided into three groups: Group I consisted of control rats; no ischemia was induced. Group II was the conventional clamp release group. Clamps were applied to the femoral vessels to induce 150 minutes of ischemia. The clamps were then released immediately and postischemic blood flow was measured. Group III was the gradual clamp release group. After 150 minutes of ischemia, clamps were released gradually at a rate so that the blood flow velocity would reach one fourth the mean preischemic value at 30 seconds, one half at 60 seconds, three fourths at 90 seconds, and would reach its preischemic value at 120 seconds. Total clamp release was allowed when blood flow was less than 1.5 fold of the preischemic values. Postoperatively the soleus muscles were evaluated histopathologically, and malonyldialdehyde and myeloperoxidase levels were measured. The mean preischemic blood flow was 13.6 +/- 2.24 ml per kilogram per minute in all groups. In the conventional release group, postischemic flow reached four to five fold its preischemic values (61.06 ml per kilogram per minute). Histopathology revealed more tissue damage in the conventional release group. Malondialdehyde and myeloperoxidase levels were also significantly lower in the gradual release group. Depending on histological and biochemical findings, a gradual increase in blood flow was demonstrated to reduce the intensity of ischemia-reperfusion injury in the soleus muscle of this animal model.

Animals↗
PubMed1997

Routine colposcopic evaluation of patients with persistent inflammatory cellular changes on Pap smear.

OBJECTIVE: To assess the rate of undetected dysplasia in patients with two consecutive reports of inflammatory cellular changes without atypia on Pap smears despite anti-inflammatory therapy. METHOD: A prospective randomized study. RESULT: 2798 premenopausal non-pregnant patients were evaluated by Pap smears of the cervix. Of these, 397 (14.2%) were reported as 'inflammatory cellular changes'. A total of 238 (8.5%) had persistent inflammatory changes without atypia despite the anti-inflammatory therapy. Fourteen patients refused colposcope. The mean age and parity of the remaining 224 patients were 30.2 +/- 6.3 (18-46) and 1.7 +/- 2.3 (0-6), respectively. When these patients underwent colposcopically-directed biopsies of the cervix, in 51 (22.7%) patients human papillomavirus lesions, dysplasia and in situ cancer were noted. Mean age, parity, age of marriage, prevalence of smoking and contraceptive methods of the two groups of patients (173 vs. 51) did not show statistically significant differences. CONCLUSION: Colposcopically-directed biopsies of the cervix are indicated even when inflammatory cellular changes without atypia persist despite therapy.

Adolescent↗
PubMed1996

The effects of hormone replacement therapy on uterine fibroids in postmenopausal women.

OBJECTIVE: To evaluate and compare the effects of two different modalities of hormone replacement therapy (HRT) on the size of uterine fibroids. DESIGN: Randomized clinical study. SETTING: The Menopause Center of a public hospital. PATIENTS: Postmenopausal women with small asymptomatic uterine fibroids were selected. INTERVENTIONS: One group was treated with 50 micrograms transdermal E2 plus 5 mg medroxyprogesterone acetate (MPA) continuously, whereas the second group was given 0.625 mg conjugated equine estrogen plus 2.5 mg MPA continuously. MAIN OUTCOME MEASURE: The size of the uterine fibroids was measured before and after the first year of HRT. RESULTS: At the end of the first year on HRT, the size of the uterine fibroids was re-evaluated sonographically and no significant difference was found with the oral group, whereas there was a significant increase in the transdermal group. CONCLUSION: Hormone replacement therapy with 50 micrograms transdermal E2 plus 5 mg MPA increases the size of the uterine fibroids.

Antineoplastic Agents, Hormonal↗
PubMed1995

Fetal methemoglobinemia: a cause of nonimmune hydrops fetalis.

A case of nonimmune hydrops fetalis resulting from fetal methemoglobinemia is presented. A woman with a pregnancy at 17 weeks' gestation was admitted after combustion gas intoxication. Although the mother totally recovered, the fetus showed signs of nonimmune hydrops fetalis at follow-up. Fetal methemoglobin levels were very high.

Adolescent↗
PubMed1994

Umbilical cord blood erythroblast count as an index of intrauterine hypoxia.

The relation of umbilical cord blood arterial pH, Apgar score, leucocyte count, and erythroblast count at delivery with the diagnosis of fetal distress in labour was studied prospectively in three groups of singleton pregnancies delivering at term vaginally (55 infants), by elective caesarean section (39 infants), or by emergency caesarean section for abnormal intrapartum fetal heart rate patterns (55 infants). In the emergency caesarean section group the umbilical cord blood arterial pH was significantly lower and the leucocyte and erythroblast counts were higher than in the elective caesarean section group. Comparison of the emergency caesarean section and spontaneous vaginal delivery groups showed significant differences for pH and erythroblast count, but not for leucocyte count. In the spontaneous vaginal delivery group erythroblastosis was associated with umbilical cord blood pH, whereas leucocytosis was associated with the length of labour. The five minute Apgar score was > or = 7 in all infants. This study suggests that leucocytosis is a non-specific response of the fetus to labour, whereas erythroblastosis reflects fetal tissue hypoxia.

Erythroblasts↗
PubMed1993

Ectopic pregnancy: transvaginal sonographic findings of 152 cases.

In a retrospective study performed on 152 cases of verified ectopic pregnancy, the features at transvaginal sonography were evaluated. A total of 146 (96%) of the patients had at least one abnormal sonographic feature and pelvic/cul-de-sac fluid was the most common finding, detected in all of the 146 patients. Pelvic/cul-de-sac fluid was particulate in 103 patients and simple in 43. Pelvic/cul-de-sac fluid together with extrauterine findings were found to be present in 93.8% (137/146) of the patients, suggesting the fact that if pelvic/cul-de-sac fluid was detected, every effort should be made to image the tube. The extrauterine transvaginal sonographic features included 102 (63.0%) patients with a mass, 60 (41.1%) with a gestational sac (with or without yolk sac or embryo), and eight (5.3%) with a living embryo. Comparison of the sonographic findings according to the status of the ectopic pregnancy revealed that particulate fluid (98.9%), and an extra-uterine mass (88.2%) were the features that aided in the diagnosis of ruptured and aborted ectopic pregnancies, whereas an extrauterine gestational sac (72.9%), and a living embryo (11.9%) were associated with intact ectopic pregnancies. Our findings support the practice of using transvaginal sonography, and ss-human chorionic gonadotropin measurements in the diagnosis and prediction of the status of ectopic pregnancy.

Journal Article↗