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Biomedical subjects

N E Aydin

Publications and source records attributed to N E Aydin.

At least 19 recordsLinked to original sources
PubMed2001

Effects of caffeic acid phenethyl ester and epidermal growth factor on the development of caustic esophageal stricture in rats.

BACKGROUND/PURPOSE: An experimental study was performed to modify the healing response in caustic esophageal burns to prevent stricture development. Two different agents with different modes of actions, caffeic acid phenethyl ester (CAPE) and epidermal growth factor (EGF), were studied. CAPE has antiinflammatory, immunomodulatory, antioxidant, and antimitotic properties. EGF has known properties in supporting wound healing and in protecting esophagus from injuries. METHODS: The model described by Gehanno and its modification by Liu was used to create standard esophageal burns with 50% NaOH. The study was performed with 76 rats in 4 main groups (sham, CAPE, EGF, and control) and 2 subgroups in each for 5 and 28 days of observation. Efficacy of treatment was assessed in 28-day subgroups by measuring weight gain, contrast esophagograms on day 27, histologic evaluation by measuring stenosis index (wall thickness/lumen diameter), and collagen deposition, and biochemically by determining tissue hydroxy proline (OHP) content. RESULTS: In the end of the study, increase rates of mean body weights of the animals in the 28-day subgroups were as follows: sham, 30%; CAPE, 23%; EGF, 22%; and control, 14%. Although all the animals in subgroups significantly gained weight, the mean weight gain was significantly low in controls when compared with sham, CAPE, and EGF groups (P <.05). Contrast esophagograms on day 27 showed no stenosis in the sham, mild stenosis in CAPE and EGF, and severe stenosis with proximal dilatation in controls. Stenosis indices of the subgroups were as follows: sham, 0.29; CAPE, 0.41; EGF, 0.41; control, 0.84. Index was significantly higher in controls (P <.05). Collagen accumulation scores in the esophageal wall were as follows: Sham, 0.0; CAPE, 0.87; EGF, 0.30; control, 2.70. Scores also were significantly higher in controls (P <.05). Tissue (OHP) levels were as follows (mg/g dry tissue): Sham, 1.48; CAPE, 1.53; EGF, 1.90; control, 4.01. Production of OHP was significantly higher in controls. CONCLUSIONS: The results of the parameters in the study indicate that administration of CAPE and EGF has beneficial effects in the prevention of caustic esophageal strictures. Those effects of CAPE may occur through its antiinflammatory, immunomodulatory, and antioxidant properties, and EGF may occur through its induced proliferative properties on the esophagus.

Animals↗
PubMed2001

Echinococcal hydatid cyst at the right ventricle outlet with leakage to the pulmonary artery outflow causing follicular airway disease and sudden death.

Postmortem examination of a 35-year-old parous woman who died suddenly revealed a hydatid cyst mass located at the right ventricular outlet, with a grossly discernible defect opening to the pulmonary outflow tract. Pulmonary hemorrhage, follicular bronchitis, and bronchiolitis also were present, with severe acute purulent exudation in the airways. Hydatid cyst complications must be kept in mind when dealing with sudden deterioration and death in patients who are residents of regions where echinococcosis is endemic.

Adult↗
PubMed1999

Adenosquamous carcinoma of the prostate.

We present an unusual variant of prostatic adenocarcinoma with obvious squamous differentiation. The squamous component is represented by cells that contain vesicular or hyperchromatic nuclei and large acidophilic cytoplasm. We could demonstrate immunohistochemically the presence of prostate specific antigen (PSA) and glial fibrillary acidic protein (GFAP) in these tumour cells. Either in adenocarcinomatous or malignant squamous components, the prostatic epithelial cells showed the two markers, namely PSA, GFAP, which may reflect the multidirectional differentiation of these cells from a pluripotent origin.

Carcinoma, Adenosquamous↗
PubMed1998

Cells in various benign and malignant conditions of the human prostate express different antigenic phenotypes.

Prostatic epithelium basically consists of secretory-luminal, basal and endocrine-paracrine cells. Immunohistochemical procedures are frequently used for showing the cells reflecting different differentiations. In this study, 40 prostatic tissue specimens submitted to the Department of Pathology of Inönü University, Research Hospital, between 1991 and 1996 were examined. Half of the cases were diagnosed as cancer and the other half had various benign lesions. Of the cases 22.5% (n = 9) were needle biopsy material whereas the remainder, 47.5% (n = 19), were from prostatectomy and 30% (n = 12) were transurethral resection of the prostate (TURP) specimens. High molecular weight anti-cytokeratin antibodies (HMW anti-cytokeratin) stained basal cells both in all normal prostatic tissue and benign prostatic lesions, but in the majority of cancers (70%, n = 14) negative immunoreactivity was seen. Nevertheless, in some of the cancer cases (30%, n = 6) basal cell anti-cytokeratin staining was shown. Negative immunoreactivity with HMW anti-cytokeratin is important in distinguishing between malignant and benign lesions, whereas positive staining is not every time in favour of benign lesions. With the usage of prostate specific antigen (PSA) it was seen that all of the malignant and benign prostatic lesions stained positively. Basal cells in hyperplastic glands were not stained with this stain. Irregular, and in some areas, intense (PSA) immunoreactivity is present in precancerous and malignant lesions. Endocrine cells, which are represented with Chromogranin-A (Chr-A) immunoreactivity and reflecting neuroendocrine differentiation, are present in 75% (n = 15) of benign lesions and in 50% (n = 10) of cancer cases. It was thought that the lesser number of these cells in neoplastic lesions in comparison to the non-tumoral lesions is correlated with the disorder of mechanism that regulates the cell growth. Both in neoplastic and non-tumoral tissues the prostatic epithelial cells showed the three markers, namely HMW anti-cytokeratin, PSA, and Chr-A, which may reflect the multidirectional differentiation of these cells from a pluripotent origin.

Adenocarcinoma↗
PubMed1996

Effect of CO2 laser on spinal epidural fibrosis.

In this study the effect of CO2 laser on spinal epidural fibrosis was examined in 24 guinea pigs which were divided into two groups. The first group was the control group, the second one the CO2 laser group. All animals had laminectomies at 3 levels. Re-exploration was performed three months after the laminectomy. In the second group the same procedure was performed but at the end of the re-exploration, CO2 laser irradiation of the epidural fibrotic tissue was done. The wounds in both groups were closed again. Four months later all animals were sacrificed. For verification and quantification of scar formation (postoperative fibrosis) light microscopic examinations and determination of hydroxyproline were done, using Bergman's spectrophotometric method. The differences which were observed between the two groups were statistically significant (U : 134, P < 0.05). This study demonstrates the reducing effect of CO2 laser irradiation on epidural scar formation. The findings encourage its use as an alternative method of prevention of epidural fibrosis after spinal surgery.

Animals↗
PubMed1994

Cervical pregnancy: can age and parity be predisposing factors?

A fifty-year old woman, gravida 17, para 17, presented with profuse vaginal bleeding following curettage in another hospital. At emergency laparotomy total abdominal hysterectomy and bilateral salpingo-oophorectomy was performed because of intractable hemorrhage. Histopathologic examination revealed endocervical placentation and adenomyosis uteri. The case is presented due to its rarity and possible predisposing factors are discussed.

Age Factors↗
PubMed1993

A case of cardiac hydatid cyst localized in the lungs bilaterally and on anterior wall of right ventricle.

A 23-year-old man had been coughing with hemoptysis, and had received tuberculostatic medication for four months without any benefit. Upon referral, two-dimensional echocardiography showed a cystic mass located in the anterior right-ventricular wall, without any protrusion into the ventricular cavity. CT examination revealed three cysts in the lung fields bilaterally, additionally a multilocular cystic image in the right-ventricular wall was observed. All components of hydatid cysts in the heart and lungs were removed in the same session by median sternotomy. Extracorporeal bypass was used in this operation.

Adult↗
PubMed1993

Transhiatal versus transthoracic esophagectomy for esophageal cancer.

We retrospectively analyzed 238 patients with esophageal carcinoma treated between 1983 and 1991; 120 underwent transthoracic esophagectomy, and 118 underwent transhiatal esophagectomy. The two groups were statistically similar in preoperative characteristics, except that upper esophageal cancer was more frequent in the transhiatal esophagectomy group than in the transthoracic esophagectomy group (p < 0.01). The rate of postoperative complications differed significantly in wound infection (21% in patients who underwent transthoracic esophagectomy, 10% in those who underwent transhiatal esophagectomy; p < 0.05) and empyema (11% with transthoracic esophagectomy, 1% with transhiatal esophagectomy; p < 0.01). Pneumothorax was detected in 24% of the transhiatal esophagectomy cases. Intraoperative blood loss was 1340 +/- 490 ml in the transthoracic esophagectomy group and 930 +/- 340 ml in the transhiatal esophagectomy group (p < 0.001). Hospital mortality was 11% in the transthoracic esophagectomy group and 6.7% in the transhiatal esophagectomy group. Late complication rate was lower with transhiatal esophagectomy than with transthoracic esophagectomy (11% and 51%, respectively). There was no significant difference in actuarial survival of patients in both groups. Transhiatal esophagectomy, which can be performed in almost all levels of the esophagus, is the safer of the two operations.

Anastomosis, Surgical↗
PubMed1993

Sudden death due to ruptured hydatid cyst of the liver.

The cyst stage of Echinococcus granulosus is commonly located in the liver, which frequently results in a long symptomless period. We present a sudden death due to a freshly hemorrhagic hydatid cyst following blunt trauma to the liver in a 19-year-old boy. The possible mechanism was thought to be an anaphylactoid reaction to the leakage of the cyst fluid.

Adult↗
PubMed1992

Bladder leiomyosarcoma: report of three cases.

Three patients with leiomyosarcoma of the urinary bladder are presented. One case showed urothelial carcinoma in situ also. The mode of presentation and operative findings were similar in two female patients, whereas the lesion seemed to be more aggressive in a male patient.

Aged↗