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Biomedical subjects

F C Tanyel

Publications and source records attributed to F C Tanyel.

At least 127 records · Page 7Linked to original sources
PubMed1996

The effects of chemical sympathectomy on contralateral testicular histology, fertility and fecundity in unilateral abdominal testes.

OBJECTIVE: To evaluate the effects of abdominal testis on ipsilateral and contralateral testicular histology, fertility and fecundity in rats which were chemically sympathectomized neonatally. MATERIALS AND METHODS: The study comprised 60 male albino rats, 30 receiving a placebo and 30 a chemical sympathectomic agent neonatally. When 21 days old, the two groups of 30 rats were each divided into three groups and underwent a control operation or abdominal fixation of one or both testes. After they were 8 weeks old, each male rat was housed with two fertile female rats for 25 days, after which their testes were harvested. Females were observed for an additional 25 days and any pregnancies and the number of offspring were recorded. Mean seminiferous tubular diameters and mean testicular biopsy scores were determined for each testis. RESULTS: Although fertility and fecundity rates and mean testicular biopsy scores were not significantly different, chemical sympathectomy prevented the decrease in mean seminiferous tubular diameters which occurred in the contralateral testis. CONCLUSION: Chemical sympathectomy protected contralateral testicular histology to some degree. Therefore, the sympathetic system may play a role in contralateral testicular deterioration.

Animals↗
PubMed1996

Is there any predictive characteristic for malignancy in thyroid enlargements during childhood?

Although thyroid surgery is mainly based on the malignancy risk, determination of cases with thyroid malignancy among the patients with enlarged thyroid is a controversial issue in children. To find out whether thyroid enlargements have any predictive clinical or laboratory characteristic for thyroid malignancy, a retrospective clinical study was scheduled. A total of 137 patients who had undergone surgery for thyroid enlargement in a 15-year period were evaluated. The series was composed of 90 (65.7%) cases with uninodular goiter, 40 (29.2%) cases with multinodular goiter and seven (5.1%) cases with diffuse goiter. Histopathologic examination showed nine (6.6%) patients with differentiated thyroid carcinoma. All the remaining patients had benign thyroid enlargements. Analysis of results showed no ideal or near-ideal predictive one for thyroid malignancies among clinical or laboratory characteristics consisting of age, sex, presumptive symptoms, previous irradiation, type of nodularity, nodule localization and size, lymphadenopathy, thyroid function tests, ultrasonography and thyroid scan. No characteristic studied had a simultaneous high level of positive and negative predictive value. Only two physical characteristics including nodule size less than 2.5 cm in diameter and lymphadenopathy had simultaneous high levels of sensitivity and specificity above 50%. Therefore new guidelines with higher predictivity should be sought for surgical evaluation of the childhood thyroid enlargements. Fine-needle aspiration biopsy that is extensively used in adults may also be an alternative approach despite some restrictive aspects in children.

Adenocarcinoma, Follicular↗
PubMed1996

Diaphragmatic rupture after plication: etiopathogenesis with review of the literature.

We present an infant who developed diaphragmatic rupture and secondary hernia following a successful diaphragmatic plication performed for congenital diaphragmatic eventration. The rupture occurred through the normal looking diaphragmatic tissue with an intact plication suture line, which has not been reported before. The possible etiologic factors of this secondary hernia are discussed with a brief review of the literature.

Diaphragmatic Eventration↗
PubMed1996

Aneurysmatic arteriovenous fistula complicating splenic injury.

A child with a posttraumatic aneurysmatic arteriovenous (AV) fistula located in the spleen is presented. The fact that the increased use of more conservative diagnostic and therapeutic approaches in splenic injuries might lead to underestimation of some uncommon complications is discussed.

Adolescent↗
PubMed1996

The effects of nephrectomy on the developing fetus.

Bilateral renal pathologies such as renal agenesis and renal dysplasia and lower urinary tract obstruction have been reported to result in pulmonary hypoplasia. Although oligohydramnios and resultant thoracic compression was suggested to be the cause of pulmonary hypoplasia, the exact mechanism is still unknown. Additionally the effect of absence of renal tissue on the development of the fetus has not been previously studied in detail. Therefore an experimental study was planned to investigate the effects of fetal nephrectomy on development. The fetuses from 27 New Zealand white rabbits were studied on the 23rd day of gestation. Right ovarian-end fetuses underwent bilateral nephrectomy or sham operations. Rabbits underwent hysterectomy on gestational day 30, and live fetuses were studied. Fetal body, lung, heart and liver weights, and lung, heart and thorax volumes were determined, organ weight/body weight ratios were calculated. Additionally, lungs were evaluated by histological examination. Although fetal nephrectomy resulted in decreased body weight (BW), lung, heart, liver weights and heart weight/BW ratio (p < 0.05), lung weight/BW and liver weight/BW ratios did not differ. Additionally, heart and thorax volumes were significantly decreased in the nephrectomy group (p < 0.05). However lung volume and thorax volume/BW ratio did not differ between groups. The histological evaluation of lungs revealed exfoliated cells but normal lung development. Bilateral fetal nephrectomy results in small-for-gestational age (SGA) status during birth without affecting the development of organic systems. Since SGA status may be associated with decreased placentofetal blood flow, bilateral nephrectomy may act through decreasing placentofetal blood flow and/or through the lack of kidney-related growth factors.

Animals↗
PubMed1996

Tissue hypoxia in ipsilateral and contralateral testes undergoing surgically induced maldescent.

The mechanism of deterioration of ipsilateral and contralateral testes during unilateral maldescent remains controversial. Proposing that alterations in tissue perfusion may play a role in ipsilateral and contralateral testicular deteriorations, an experimental study has been planned to evaluate the status of parameters of tissue hypoxia in ipsilateral and contralateral testes following surgically induced maldescent, in rats which preoperatively underwent placebo or chemical sympathectomy. 60 male albino rats were used for the experiment. At the age of 21 days each 30 rats that were treated by placebo or chemical sympathectomy agent were divided into 3 groups undergoing sham operation, abdominal fixation of one testis or abdominal fixation of both testes. At the age of 3 months the rats underwent bilateral orchidectomies and lactic acid (LA) and hypoxanthine (HX) levels were measured in testicular tissues. Maldescent of the testis resulted in a marked increase of LA and HX values in the ipsilateral testis compared to controls, and also resulted in increased levels of LA and HX in the contralateral testis. Although the levels of LA and HX were lower compared to ipsilateral undescended counterparts the levels in contralateral testis were significantly elevated compared to the contralateral testes of rats undergoing sham operation following placebo treatment. Bilateral maldescent resulted in similar elevations of LA and HX in both of the testes. Administration of 6-hydroxydopamine did not result in decreased levels of LA and HX values in the ipsilateral testis following unilateral testicular undescendence. However the LA levels in the contralateral descended testis did not reveal a significant difference compared to the contralateral testis of rats undergoing sham operation. The present experimental design reveals that abdominal fixation of the testis results in tissue hypoxia not only in the ipsilateral but also in the contralateral testis. Chemical sympathectomy has some protective effects on contralateral testicular hypoxia during unilateral maldescent. Tissue hypoxia during maldescent may result from relative inadequacy of testicular blood flow to overcome the increased metabolic demands under hyperthermic conditions.

Animals↗
PubMed1996

Esophageal ligation: effects on the development of fetal organic systems.

The role of amniotic fluid ingestion on the development of various fetal organic systems was evaluated in the rabbit model. The fetuses from 24 New Zealand white rabbits were studied on the 23rd day of gestation. Right ovarian-end fetuses underwent esophageal ligation (EL) or sham (SH) operations. Rabbits were submitted to hysterectomy on gestational day 30, and various organic systems of live fetuses were examined by weight and histological evaluations. Additionally, small intestinal enzymes were determined. Three fetal deaths, one in EL and two in SH groups, occurred with a total survival rate of 85%. EL resulted in increased amniotic fluid volume. Although fetal body weights (BW), lung, heart, liver and renal weights and liver weight/BW, lung weight/BW ratios did not differ, gastric, small intestinal and total gastrointestinal tract weights significantly decreased in EL group (p < 0.05). Additionally, gastric weight/BW, small intestinal weight/BW, total gastrointestinal tract weight/BW and renal weight/BW ratios were also significantly decreased (p < 0.01). Sucrase and maltase activities were not detectable in either group. Lactase activity in proximal small intestinal tissue was significantly decreased in EL group (p < 0.05). Mid and distal small intestinal tissue lactase activities did not reveal any significant difference among groups. Histologically, alveolar enlargement and alveolar thickening in fetal lungs, decreased glomerular count and tubular degeneration in fetal kidneys, and slight changes in fetal livers such as cellular vacuolization and reduction in central vein count were observed in the fetuses with esophageal ligation. While small intestinal tissues showed no marked changes, fetal stomach tissues in EL group revealed marked histological alterations consistent with erosive gastritis. This study suggests that amniotic fluid ingestion has no important effects on fetal somatic growth but effects the development of various fetal organic systems. Since the nutritional role of amniotic fluid is obscure, changes in amniotic fluid dynamics, and/or impairment of release of some possible fetal organotrophic factors, and/or unused states of the organs may be responsible for the morphologic changes secondary to esophageal ligation.

Amniotic Fluid↗
PubMed1996

Appendicitis after blunt abdominal trauma: cause or coincidence?

The association of appendicitis and blunt abdominal trauma (BAT) is an exceptionally rare occurrence with a few case reports in the literature. The main question whether this association is a result of causative or coincidental relationship has not been evaluated among children. A retrospective clinical study was performed to clarify the pathogenesis, incidence, clinical characteristics and outcome of appendicitis diagnosed in children during the hospitalization period following blunt abdominal trauma (BAT). The records of 554 patients with BAT who were admitted to our unit between 1979 and 1993 inclusive were reviewed. Five patients (0.90%), 3 males and 2 females, with a mean age of 9.4 +/- 1.4 were found to have appendicitis. None of these patients had any signs or symptoms related to appendicitis prior to BAT. Bruising and rupture of the mesoappendix were noted in 3 patients while edema and hematoma of appendix and terminal ileum were found in two. Full recovery was achieved in all patients following appendicectomy. Our incidence of 0.90% is statistically significantly higher than the highest incidence rate of appendicitis stated in the literature during childhood (t-test for population proportion, t = 2.892; p < 0.05). We emphasise the possibility of a causative relationship between appendicitis and BAT depending on the clinical characteristics, operative findings, statistically significant high incidence rate and literature review.

Abdominal Injuries↗
PubMed1995

The effect of low amniotic pressure without oligohydramnios on fetal lung development in a rabbit model.

OBJECTIVE: Our purpose was to examine fetal lung development in reduced intraamniotic pressure without amniotic fluid loss. STUDY DESIGN: A circular portion of uterine wall measuring 1 cm in diameter was excised while the chorionic and amniotic membranes were left intact at the twenty-third day of gestation in New Zealand White rabbits. The chorionic and amniotic membranes herniated spontaneously through the defect. RESULTS: Amniotic pressure was significantly reduced after herniation. Lung weight/body weight ratios at term were significantly reduced in experimental fetuses compared with controls. Residual amniotic fluid volumes at term did not differ. Histopathologic examination of lung specimens showed that fetal lungs had not matured in the experimental group as fully as in the control group. CONCLUSION: This experimental study demonstrated that low amniotic pressure impaired fetal lung development, even without oligohydramnios.

Amnion↗
PubMed1995

Adhesive small bowel obstruction caused by familial Mediterranean fever: the incidence and outcome.

Familial Mediterranean fever (FMF) is a disease characterized by recurring and self-limiting attacks of febrile serosal inflammation involving the peritoneal, synovial, and pleural membranes. Peritonitis is the most common clinical picture of FMF, and repeated acute abdominal episodes may result in formation of peritoneal adhesions that may cause adhesive small bowel obstruction (ASBO) requiring surgical intervention. This subject has neither been clarified nor thoroughly evaluated in the literature. The records of 355 pediatric patients diagnosed to have FMF were reviewed in order to clarify the incidence and outcome of ASBO without prior laparotomy during the course of FMF. The incidence rate has been found as 3% with no mortality. This figure shows ASBO to be the most frequent complication of FMF. Therefore this life-threatening surgical emergency should be kept in mind in the differential diagnosis of acute abdominal attacks during the course of FMF.

Child↗
PubMed1995

Malacoplakia involving the surgical wound in a 4 year old.

Malacoplakia is a specific chronic inflammatory disease. In the English-language literature, there are a few reports of gastrointestinal malacoplakia occurring in childhood. The authors present the first case of gastrointestinal malacoplakia involving a surgical wound and preventing healing, with persistent drainage; the patient was a 4-year-old boy. The clinicopathologic features of this rare entity are discussed, with emphasis on diagnosis and treatment.

Child, Preschool↗
PubMed1995

Primary omental torsion in a 6-year-old girl.

The case of a 6-year-old girl who was admitted with abdominal pain and diagnosed to have primary omental torsion through laparatomy is presented. The presence of serosangineous fluid mimicking acute appendicitis but clinically not as bad as expected is suggested to raise the suspicion of primary omental torsion.

Abdomen, Acute↗
PubMed1995

Familial intestinal polyatresia syndrome.

Familial multiple-level intestinal atresia is a rare syndrome with autosomal recessive inheritance. Only a few well-documented families have been reported in the medical literature. In this article two new cases from a consanguineous couple are presented. These are the first reported cases of Familial Intestinal Polyatresia Syndrome from Turkey. The importance of this report is that the recognition of multiple intestinal atresias as an invariably fatal syndrome will be helpful for genetic counselling and attempts at early prenatal diagnosis for successive pregnancies in these couples.

Female↗
PubMed1995

Fetal penile and urethral development subsequent to vascular insult in the last trimester of gestation: an experimental study in goat fetuses.

OBJECTIVE: To investigate a possible mechanism (the vascular theory) in the development of congenital anomalies of the penis and urethra in the fetus of the goat. MATERIALS AND METHODS: Fifteen male Angora goat fetuses underwent an operation at 110-114 days of gestation whereby branches of the internal pudendal artery within the superficial compartment of the perineum were ligated. Five male fetuses served as controls in which the perineum was explored with no ligation. RESULTS: Five treated and three control live offspring were delivered spontaneously. Although no genitourinary anomalies were observed on gross examination, histopathological examination of the penises of treated animals revealed smaller penises with increased fibrosis. CONCLUSION: A defective vascular supply can partly explain the morphogenesis of some aspects of the congenital anomalies of the penis and urethra.

Animals↗