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Biomedical subjects

Levent Naci Ozluoglu

Publications and source records attributed to Levent Naci Ozluoglu.

11 recordsLinked to original sources
PubMed2006

Endoscopic sinus surgery for maxillary sinus mucoceles.

BACKGROUND: Maxillary sinus mucoceles are relatively rare among all paranasal sinus mucoceles. With the introduction of endoscopic sinus surgical techniques, rhinologic surgeons prefer transnasal endoscopic management of sinus mucoceles. The aim of this study is to describe the clinical presentation of maxillary sinus mucoceles and to establish the efficacy of endoscopic management of sinus mucoceles. METHODS: Between 2003 and 2005, 14 patients underwent endoscopic sinus surgery for maxillary sinus mucocele. The presenting sign and symptoms, radiological findings, surgical management and need for revision surgery were reviewed. RESULTS: There were eight males and six females with an age range of 14 to 65. Ten patients complained of nasal obstruction, five of nasal drainage, five of cheek pressure or pain and one of proptosis of the eye and cheek swelling. The maxillary sinus and ipsilateral ethmoid sinus involvement on computed tomographic studies was seen in 4 patients. Four patients had history of endoscopic ethmoidectomy surgery for ethmoid sinusitis and one had Caldwell-Luc operation in the past. Ethmoidectomy with middle meatal antrostomy and marsupialization of the mucocele was performed in all patients. Postoperative follow-up ranged between 8 to 48 months. All patients had a patent middle meatal antrostomy and healthy maxillary sinus mucosa. No patients need revision surgery. CONCLUSION: The most common causes of mucoceles are chronic infection, allergic sinonasal disease, trauma and previous surgery. In 64% of the patients of our study cause remains uncertain. Endoscopic sinus surgery is an effective treatment for maxillary sinus mucoceles with a favorable long-term outcome.

Adolescent↗
PubMed2006

Follicular dendritic cell sarcoma of the tonsil: case report.

Follicular dendritic cell sarcomas are unusual, and extranodal origin is extremely rare. The English literature contains only eight cases in which this sarcoma has been presented as a tonsillar mass. We report a new case of follicular dendritic cell sarcoma of the tonsil in a 76 year old woman. The patient underwent diagnostic tonsillectomy for a left tonsillar mass, and follicular dendritic cell sarcoma was diagnosed based on histopathological and immunoperoxidase findings. Postoperative radiotherapy was performed. The patient is alive and disease-free at 4 years of follow-up. Without a high index of suspicion, this entity can easily be missed. We believe that follicular dendritic cell sarcoma should be included in the differential diagnosis for any tonsillar mass.

Aged↗
PubMed2006

Buffered papaverine facilitates passage of intratympanic dexamethasone to the inner ear.

CONCLUSION: We conclude that when papaverine is intratympanically administered together with dexamethasone after buffering, passage of dexamethasone to the inner ear is increased. OBJECTIVE: To determine the influences of papaverine and buffered papaverine on passage of dexamethasone administered intratympanically to the inner ear. MATERIALS AND METHODS: Twenty-seven Vienna white rabbits were divided into five groups: eight received intratympanic dexamethasone (4 mg/ml) (group 1), seven received intratympanic papaverine (10 mg/ml) + dexamethasone (2 mg/ml) (group 2), six received buffered (with sodium bicarbonate 8.4%) intratympanic papaverine (7.5 mg/ml) + dexamethasone (1.5 mg/ml) (group 3), three had basal cortisol levels in venous blood and perilymph measured (group 4), and three received intravenous papaverine + dexamethasone (group 5). At 1 h after the administration of the drugs, dexamethasone levels in ipsilateral and contralateral perilymph and venous blood were measured by radioimmunoassay. RESULTS: Animals in group 3 demonstrated the highest levels of ipsilateral perilymph dexamethasone. Ipsilateral perilymph levels were significantly higher in groups 1 and 3 than they were in the other groups (p<0.05). Although the perilymph levels observed in animals in group 2 were slightly higher than those in group 4, no significant difference existed (p = 0.160).

Animals↗
PubMed2006

Evaluation of patients with globus pharyngeus with barium swallow pharyngoesophagography.

OBJECTIVE: The objective of this study was to determine the value of barium swallow pharyngoesophagography in the investigation of patients with globus pharyngeus who had no known disease, no operation history in the head and neck region, and no thyroid pathology. We compare the clinical presentation with the radiologic findings to assess the diagnostic accuracy of barium swallow in such patients. METHODS: This was a retrospective study of the clinical records and radiologic reports of 194 patients with globus pharyngeus, between October 1998 and October 2004, that were reviewed and analyzed for correlations between clinical signs and symptoms and barium swallow findings using the chi2 test. All the patients had normal ear, nose, and throat examination, including indirect laryngoscopy and/or nasoendoscopy. Patients with known pharyngeal and esophageal disease, neurologic disease known to cause pharyngeal or esophageal dysfunction, evidence of autoimmune disease or diabetes mellitus, with a thyroid operation in the past and thyroid nodules detected with radiologic investigation were excluded. RESULTS: There were 116 (59.8%) female and 78 (40.2%) male patients. In 114 patients (59%), globus was the only symptom. Sore throat was the most common associated complaint. Benign barium swallow findings were detected in 63.9% of the patients. Cervical osteophyte indentation was the most common finding. In 36.1% of the patients, the radiologic finding was normal. The statistical analysis using the chi2 test showed a significant relationship (P < .001) between the symptoms of globus pharyngeus and the barium swallow results. CONCLUSION: Barium swallow pharyngoesophagography is useful to detect underlying benign characteristic pathologies in patients with globus who have no known head and neck illness.

Adult↗
PubMed2003

Effects of the nasal valve on acoustic rhinometry measurements: a model study.

The influence of nasal valve on acoustic rhinometry (AR) measurements was evaluated by using simple nasal cavity models. Each model consisted of a cylindrical pipe with an insert simulating the nasal valve. The AR-determined cross-sectional areas beyond the insert were consistently underestimated, and the corresponding area-distance curves showed pronounced oscillations. The area underestimation was more pronounced in models with inserts of small passage area. The experimental results are discussed in terms of theoretically calculated "sound-power reflection coefficients" for the pipe models. The reason for area underestimation is reflection of most of the incident sound power from the barrier at the front junction between the pipe and the insert. It was also demonstrated that the oscillations are due to low-frequency acoustic resonances in the portion of the pipe beyond the insert. The results suggest that AR does not provide reliable information about the cross-sectional areas of the nasal cavity posterior to a significant constriction, such as pathologies narrowing the nasal valve area. When the passage area of the nasal valve is decreased, the role of AR as a diagnostic tool for the entire nasal cavity becomes limited.

Anatomy, Cross-Sectional↗
PubMed2003

Juvenile hyaline fibromatosis: a case report.

Juvenile hyaline fibromatosis (JHF) is a rare disease with autosomal recessive inheritance. It is characterized by papulonodular skin lesions which are painless but cosmetically unacceptable, and often disturb normal joint function. The nose, chin, ears, scalp, back, and knees are the most common affected sites. In some cases, gingival hypertrophy, flexion contractures of the large joints, osteolytic bone lesions, and stunted growth may be associated with skin lesions. We report a 9-year-old girl presented with a soft, painless, slow growing, tumoral mass on the supratip of her nose. The lesion was totally excised with open rhinoplasty approach and histopathological diagnosis was JHF.

Child↗
PubMed2002

Effects of paranasal sinus ostia and volume on acoustic rhinometry measurements: a model study.

We used pipe models to investigate the effects of paranasal sinus ostium size and paranasal sinus volume on the area-distance curves derived by acoustic rhinometry (AR). Each model had a Helmholtz resonator or a short neck as a side branch that simulated the paranasal sinus and sinus ostium. The AR-derived cross-sectional areas posterior to the ostium were significantly overestimated. Sinus volume affected the AR measurements only when the sinus was connected via a relatively large ostium. The experimental area-distance curve posterior to the side branch showed pronounced oscillations in association with low-frequency acoustic resonances in this distal part of the pipe. The experimental results are discussed in terms of theoretically calculated "sound-power reflection coefficients" for the pipe models used. The results indicate that the effects of paranasal sinuses and low-frequency acoustic resonances in the posterior part of the nasal cavity are not accounted for in the current AR algorithms. AR does not provide reliable information about sinus ostium size, sinus volume, or cross-sectional area in the distal parts of nasal cavity.

Humans↗
PubMedDate not supplied

Viability of crushed and diced cartilage grafts: a study in rabbits.

OBJECTIVE: To investigate the effects of dicing and different degrees of crushing on cartilage graft viability and outcome in rhinoplasty. METHODS: Cartilage was harvested from both ears of 29 rabbits. For each animal, 6 cartilage pieces were prepared as follows and inserted into the paraspinal subcutaneous tissue: (1) left intact, (2) diced to approximately 1 x 1-mm pieces and then wrapped in oxidized regenerated cellulose, (3) slightly crushed, (4) moderately crushed, (5) significantly crushed, and (6) severely crushed. Animals were killed at 2, 5, and 10 months, and graft specimens were microscopically examined. RESULTS: As crushing intensity rose, cartilage viability decreased and more cartilage tissue was transformed to connective tissue. The intact and slightly crushed grafts showed significant chondrocyte proliferation. This decreased as crushing intensity increased, and the severely crushed and diced cellulose-wrapped grafts exhibited almost no peripheral chondrocyte proliferation. CONCLUSIONS: Slight crushing of a cartilage graft can produce outstanding graft material that forms softer nasal contours and fills defects well. However, severe crushing of cartilage grafts results in extensive necrosis and eventual reduction in graft volume. The use of oxidized regenerated cellulose to wrap diced cartilage grafts also tends to reduce clinical predictability owing to negative effects on cartilage viability and regeneration.

Animals↗
PubMedDate not supplied

Viability of cultured human nasal septum chondrocytes after crushing.

OBJECTIVE: To investigate how different degrees of crushing affect the viability of human nasal septum chondrocytes in adherent cell cultures. METHODS: Cartilage grafts were harvested from the nasal septa of 15 patients who underwent submucosal resection. Five cartilage pieces were prepared from each specimen as follows: the cartilage was left intact, slightly crushed, moderately crushed, significantly crushed, or severely crushed. Chondrocytes were isolated for trypan blue dye exclusion testing, and the numbers of viable cells were determined at 1, 2, 3, and 10 days after culturing. Comparisons were made among the groups. RESULTS: The day 1 viability rates for the intact, slightly crushed, moderately crushed, significantly crushed, and severely crushed cartilage preparations were 96%, 92%, 82%, 72%, and 54%, respectively. The corresponding rates on day 10 were 93%, 90%, 84%, 75%, and 68%. CONCLUSIONS: The viability and proliferative capacity of crushed human septal cartilage depend on the degree of crushing sustained. Slightly or moderately crushed cartilage grafts show good chondrocyte viability and proliferation and are valuable for fashioning soft nasal contours, filling defects, and concealing dorsal irregularities. However, significant or severe crushing reduces chondrocyte viability and proliferation and may result in unpredictable degrees of graft volume loss.

Adolescent↗
PubMedDate not supplied

Effects of anatomical variations of the nasal cavity on acoustic rhinometry measurements: a model study.

BACKGROUND: The goal of this study was to assess how anatomic variations of the nasal cavity affect the accuracy of acoustic rhinometry (AR) measurements. METHODS: A cast model of a human nasal cavity was used to investigate the effects of the nasal valve and paranasal sinuses on AR measurements. A luminal impression of a cadaver nasal cavity was made, and a cast model was created from this impression. To simulate the nasal valve, inserts of varying inner diameter were placed in the model nasal passage. To simulate the paranasal sinuses, side branches with varying neck diameters and cavity volumes were attached to the model. RESULTS: The AR measurements of the anterior nasal passage were reasonably precise when the passage area of the insert was within the normal range. When the passage area of the insert was reduced, AR measurements significantly underestimated the cross-sectional areas beyond the insert. The volume of the paranasal sinus had limited effect on AR measurements when the sinus ostium was small. However, when the ostium size was large, increasing the volume of the sinus led to significant overestimation of AR-derived areas beyond the ostium. CONCLUSION: The pathologies that narrow the anterior nasal passage result in the most significant AR error by causing area underestimation beyond the constriction. It also appears that increased paranasal sinus volume causes overestimation of areas posterior to the sinus ostium when the ostium size is large. If these physical effects are not considered, the results obtained during clinical examination with AR may be misinterpreted.

Computer Simulation↗