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Biomedical subjects

M Kautzky

Publications and source records attributed to M Kautzky.

At least 19 recordsLinked to original sources
PubMed2002

[Adenosquamous carcinoma of the palate].

A rare case of adenosquamous carcinoma in a 74 year-old man is reported. Presenting as a nodule on the soft palate, diagnosis was prolonged because of the benign macroscopic aspect. CT-scan and MR-tomography showed an encapsulated lesion but biopsy and histologic examination revealed the typical features of adenosquamous carcinoma. The tumour consisted of adenocarcinoma and squamous cell carcinoma in close proximity to minor salivary glands of which the tumour seemed to have its origin. This entity, although rare in the head and neck region has been documented to be very aggressive with early regional and hematogenic metastasis. Therefore it has to be distinguished from other tumours, especially from mucoepidermoid carcinomas of the salivary glands, which have a better prognosis. Adenosquamous carcinoma is considered to have poor radiosensitivity and chemotherapeutic approaches have also not been successful in the literature. In our case radical surgical therapy was performed by excision of the whole soft palate and bilateral neck dissection. This resulted in total removal of the tumour but revealed bilateral lymph node metastases. Vital functions were saved by reconstruction of the palate with a free vascularized tensor-fasciae-latae-perforator-flap. For the first time in a case of adenosquamous carcinoma carcinoembryonic antigen in serum was monitored. A pretherapeutical 29-fold elevation resulted in a marked decrease after surgery, but supranormal values indicated remaining tumour burden which was found in metastases in the lung. Because of the limitations in therapy, early histologic diagnosis is most important in this highly malignant tumour.

Aged↗
PubMed2000

Upper airway findings in patients with nocturnal breathing disorders.

This prospective open study was performed to examine the relation between pathologic findings of the upper respiratory tract and the types of noncentral sleep disorders (rhonchopathy, obstructive sleep apnea). 312 men and 274 women aged between 35-75 years attended our outpatient department for relief of their nocturnal breathing disorder. About 1/3 of the patients suffered only of habitual rhonchopathy and 2/3 were obstructive. No findings of the head and neck examination could predict the degree of oxygen desaturation, although pathologies of the nose (73.68%), the soft palate (94.1%) and narrowing of the oro- and hypopharynx (74.19%) were very common in patients with sleep disorder. At least one pathology could be found in every patients. The more pathologies were found the higher was the risk of obstructive sleep apnoea with desaturation below 70%. Unrelated tonsillectomy (51.36%) did not prevent nocturnal breathing disorders.

Adult↗
PubMed2000

Glutathione in the prevention of cisplatin induced toxicities. A prospectively randomized pilot trial in patients with head and neck cancer and non small cell lung cancer.

PURPOSE: Glutathione has been shown to be an effective chemoprotector against cisplatin-induced side effects in patients with ovarian cancer. In view of this fact, we performed a randomized clinical pilot-trial in the management of other solid tumors in order to compare application of Glutathione to intensive hydration in patients undergoing chemotherapy with a regimen including cisplatin. PATIENTS AND METHODS: Twenty patients suffering from advanced non small cell lung cancer (n = 6) or head- and neck cancer (n = 14) were enrolled in the study. All patients received 80 mg/m2 cisplatin along with etoposide or 5-fluorouracil every 4 weeks. Patients randomized to application of Glutathione (n = 11) received 5 g of Glutathione immediately before application of cisplatin followed by 2000 ml of normal saline. Patients in the control group (n = 9) received 2000 ml electrolyte infusion before and 2000 ml of normal saline with forced diuresis after cisplatin. RESULTS: The intensity of hematologic toxicity was significantly less pronounced in patients treated with Glutathione than in the control group (hemoglobin: 10.7 vs 9.5 mg% respectively, p = 0.039; white blood cell count 3.3 vs 2.2 x 103/microliter respectively, p = 0.004; platelets 167 vs 95 x 103/microliter respectively, p = 0.02), whereas in terms of non-hematologic toxicity no difference was observed. Objective remission occurred in 6 out of 11 evaluable patients from the group receiving Glutathione (55%; complete remission: 9%; partial remission: 46%), and in 4 out of 8 evaluable patients from the control group (partial remission: 50%). However, there was no statistical difference in terms of response and overall survival (13.5 months vs. 10.5 months) between the two groups. CONCLUSIONS: Application of Cisplatin and Glutathione seems to be safe and feasible and the antitumoral efficacy of cisplatin is apparently not impaired by the concomitant use of Glutathione in patients with solid tumors.

Adult↗
PubMed1998

Postmenopausal hormone use and risk for colorectal cancer and adenoma.

BACKGROUND: Accumulating evidence suggests that postmenopausal hormone use may decrease the risk for colorectal cancer. OBJECTIVE: To examine the relation of postmenopausal hormone therapy to colorectal adenoma and cancer. DESIGN: Prospective cohort and nested case-control studies. SETTING: Nurses' Health Study, a study of registered nurses recruited from 11 U.S. states. PARTICIPANTS: 59 002 postmenopausal participants in the Nurses' Health Study. MEASUREMENTS: Self-reported data on hormone use and cases of distal colorectal adenoma and colorectal cancer obtained from biennial questionnaires completed from 1980 to 1994. Cases of colorectal adenoma and cancer were confirmed by medical record review. RESULTS: 470 women developed colorectal cancer, and 838 developed distal colorectal adenomas. Current use of postmenopausal hormones was associated with a decreased risk for colorectal cancer (relative risk [RR], 0.65 [95% CI, 0.50 to 0.83]). This association was attenuated in past users (RR, 0.84 [CI, 0.67 to 1.05]) and disappeared 5 years after hormone use was discontinued (RR, 0.92 [CI, 0.70 to 1.21]). Longer duration of current use did not afford greater protection (RR with > or =5 years of use, 0.72 [CI, 0.53 to 0.96]). Even after exclusion of women who reported having screening sigmoidoscopy, the relative risk for colorectal cancer seen with current hormone use was 0.64 (CI, 0.49 to 0.82). This suggests that the apparent protection is unlikely to be due to more intensive screening among hormone users. Current users also had a lower risk for large (> or =1 cm) adenomas than did women who had never used hormones (RR, 0.74 [CI, 0.55 to 0.99]), although no overall material association was seen between colorectal adenoma and current hormone use (RR, 0.91 [CI,0.77 to 1.08]). CONCLUSIONS: The risk for colorectal cancer was decreased among women currently receiving postmenopausal hormone therapy, but the apparent reduction substantially diminished upon cessation of therapy. Hormone use was inversely associated with large colorectal adenomas but not small ones.

Adenoma↗
PubMed1998

Fixation of zygomatic fractures with a new biodegradable copolymer osteosynthesis system. Preliminary results.

In a prospective study, a new biodegradable osteosynthesis material for the facial skeleton has been used in 27 patients with zygomatic fractures. In the six-month follow-up period, the first ten patients showed clinically and radiologically uneventful healing of bone. There were no implant-related complications. The main advantages of the new material are its malleability when heated, enabling fast adaptation to the bone surface, and the avoidance of a second operation for implant removal.

Absorbable Implants↗
PubMed1997

Soft-tissue effects of the holmium:YAG laser: an ultrastructural study on oral mucosa.

BACKGROUND AND OBJECTIVE: The specifics of the ablation mechanism of the holmium:YAG laser remain largely unexplored. Following laser exposure to the oral mucosa of rats, the ultrastructural damage profile obtaining to varying degrees in blood vessels, erythrocytes, nerves, and muscle cells was examined. An attempt was made to relate the cytoplasmatic alterations to the tissue ablation modes of midinfrared lasers described in the literature. STUDY DESIGN/MATERIALS AND METHODS: The biological effects of a new pulsed holmium:YAG laser (lambda = 2,120 nm) on the oral mucosa of rats were examined by light and transmission electron microscopy. Laser incisions reaching into the muscle layer were made on different sites of the tongue of white rats. Laser energy (400 mJ, 2.5 microseconds pulse, 2 Hz) was delivered to the target via 400 microns nylon fibers. RESULTS: The fine-structural morphology of the sublingual mucosa after laser surgery of the epithelial surface revealed no carbonization layer but a 150-micron-wide zone of lacunar structures extending to the lamina propria. In the muscle cells there is partial decomposition of the cell contents resulting in the development of electron optically empty spaces within the cortical cytoplasm underneath the intact plasma membrane of the muscle cell. The organelles within the cell remain ultrastructurally intact. CONCLUSION: These features support the assumption of an additional nonthermal holmium:YAG laser-tissue interaction.

Animals↗
PubMed1997

Ophthalmoplegia as an unusual initial symptom of non-Hodgkins' lymphoma in the head and neck.

Non-Hodgkins' lymphomas are relatively common tumors in the head and neck and should always be considered in the differential diagnosis of any mass lesion in this region, especially in cases with single enlarged lymphnodes of unknown origin and symptoms that can only be explained by metastasis. The diagnosis is usually established by multidisciplinary collaboration. We report our experience in managing a 48-year-old man who was found to have a non-Hodgkins' lymphoma in his neck that was complicated by a metastasis to his brain causing incomplete ophthalmoplegia, a rare primary complication. The differential diagnosis and the examinations leading to the diagnosis are discussed.

Brain Neoplasms↗
PubMed1996

Flexible fiberoptic endoscopy and laser surgery in obliterated cochleas: human temporal bone studies.

BACKGROUND AND OBJECTIVE: The use of conventional drilling procedures in cochlear implant surgery of ossified cochleae poses special risks to the facial nerve and the carotid artery. This study evaluated the alternate use of flexible fiberoptic endoscopy and mid-infrared laser surgery for recanalization of partially and artificially obliterated cochleae in freshly dissected human cadavers. STUDY DESIGN/MATERIALS AND METHODS: A pulsed Holmium:YAG-laser (lambda = 2120 nm) was used in the free-running mode (1180 mJ, 250 microseconds pulse, 5 Hz). A 660 microns optic quartz fiber was positioned in the center of the round window niche and slowly--endoscopically guided--advanced in contact shooting over 1.5 cm, creating by vaporization and photoablation a passage through the artificial bony occlusion in the basal segment of the cochlea. RESULTS: In all experiments, laser application (110-130 pulses) resulted in complete recanalization of the bony occlusions without damaging surrounding structures. The microendoscopy proved capable of guiding the laser fiber through the curved segment of the basal turn allowing identification of normal bone, bone cement, and laser-treated bone cement. CONCLUSION: If partial ossification of the basal turn is present, this technique could give access to place analog as well as digital implants deep within the cochlea.

Cochlea↗
PubMed1996

Traumatizing effects of blind oral intubation using the Augustine Guide.

PURPOSE: This study evaluated whether the Augustine Guide, a device enabling blind oral intubation, carries a high risk for laryngopharyngeal trauma in routine airway management. PATIENTS AND METHODS: Telescopic laryngoscopic or microlaryngoscopic examinations were performed in 20 patients before and immediately after blind oral intubation, as well as 24 hours postoperatively. RESULTS: Intubation using the Augustine Guide was successful in all but one patient. However, 18 of 20 patients showed evidence of considerable trauma to the laryngopharyngeal region. Vallecular edema, epiglottic swelling, mucosal lacerations, and vocal cord hematomas, causing a high percentage of postoperative discomfort, occurred in a very uniform pattern. CONCLUSIONS: It was concluded that blind oral intubation using the Augustine Guide should not be used in routine airway management but should only be used in special indications.

Adult↗
PubMed1996

[Malignant transformation of a peripheral nerve sheath tumor in the area of the paranasal sinuses].

BACKGROUND: Distinguishing schwannoma from neurofibroma of the paranasal sinuses can be difficult. PATIENTS: We present the rare case of malignant peripheral nerve sheath tumor of the frontoethmoid complex that occurred in a patient who had suffered from schwannoma at the same site 7 years before. The tumor was examined clinically, histologically, and immunohistochemically. RESULTS: Although complete surgical excision of the primary tumor should have been an apparently adequate management for benign schwannoma, the tumor recurred and even metastasized into the brain. The tumor was resistant to aggressive surgical therapy combined with adjuvant irradiation and gamma knife therapy. The results of histological examinations identified schwannian features of the primary tumor and clearly outlined differentiation to solitary neurofibroma. CONCLUSIONS: Considering that schwannomas can be predominantly benign with foci of malignant areas and that there are reported cases of malignant transformation of benign schwannomas, the present consensus in management of small and low-grade malignant schwannomas is complete surgical excision with negative margins. The therapy of choice for high-grade malignant schwannomas is aggressive surgical resection, with wide tumor free margins, combined with adjuvant irradiation and chemotherapy.

Aged↗
PubMed1996

Conventional vs accelerated fractionation in head and neck cancer.

From October 1990 to March 1994, 90 patients entered a prospectively randomised trial in head and neck cancer. All patients had verified squamous cell carcinoma and were referred for primary radiation therapy. Tumours originated in the oral cavity in 25, oropharynx in 37, larynx in 15 and hypopharynx in 13 cases. Patients' stages were predominantely T3 and T4 (71/90) and had lymph node metastases (60/90). Seventy-nine male patients and 11 female patients, with a median age of 57 years (range 37-76 years) were treated. Patients were randomised to one of three treatment options: conventional fractionation (CF) consisting of 70 Gy in 35 fractions over 7 weeks or continuous hyperfractionated accelerated radiation therapy (Vienna-CHART) or Vienna-CHART with administration of a single dose of mitomycin C on day 5 of treatment (V-CHART + MMC). By the accelerated regimen a total dose of 55.3 Gy was given in 33 fractions within 17 consecutive days. Acute mucositis was the main toxicity recorded in those patients treated by accelerated fractionation, although the overall duration of mucosal reaction did not differ in the three treatment groups. There was no influence on local toxicity if MMC was added to radiation therapy or not. Those patients treated with additional MMC experienced a grade III/IV haematological toxicity in 4/28 cases. Complete remission (CR) was recorded in 48% following CF, 79% after Vienna-CHART (P < 0.05) and 71% after Vienna-CHART + MMC. The overall local failure rates were 73%, 59% and 42% (P = NS) for patients treated by CF, Vienna-CHART and Vienna-CHART + MMC respectively.

Adult↗
PubMed1995

Malignant melanoma of the vulva: a review.

Vulvar melanoma is an unusual tumor with a poor prognosis. Most surgeons have abandoned radical vulvectomy as the treatment of choice. The role of elective node dissection is controversial. Currently effective adjuvant therapy is lacking. In this paper 51 sources concerning melanoma and/or melanoma of the vulva were reviewed, 43 of these sources were considered to be pertinent and current enough to include in this review. The objective was to describe current knowledge about the natural history, staging, pathology, and treatment of melanoma of the vulva. It has been found that melanoma continues to be difficult to treat when in advanced stages. Microstaging systems offer clinicians the best prognostic information. In many patients, less radical surgical treatment offers equal cure rates with decreased morbidity.

Age Distribution↗
PubMed1995

[Laser surgical excision of a hypopharyngeal hemangioma using the CO2/Nd: YAG combination laser].

Hemangiomas of the upper aerodigestive tract may present a therapeutic challenge depending on their size, location and symptoms. We present a rare case of cavernous hemangioma of the aryepiglottic fold applaning in an adult. First symptoms were dysphagia and hoarseness. Surgical removal was performed with a CO2/Nd: YAG combination laser under microscopic control. After a regular postoperative course the patient has remained disease-free after a 2 year follow up period. We suggest the use of the CO2/Nd: YAG combination laser as preferred treatment in cases of exophytic hemangiomas, because of the favorable combination of excision with photocoagulation effects.

Adult↗
PubMed1994

Holmium: YAG laser surgery in obliterated cochleas: an experimental study in human cadaver temporal bones.

A pulsed holmium:YAG laser (lambda = 2120 nm) was used to reopen the basal turn of artificially obliterated human cochleas in freshly dissected cadavers. This allowed intracochlear insertion of the stimulation electrode of a cochlear implant under simulated surgical conditions. Laser energy was transmitted through a 400-microns nylon fiber via the opened facial recess directly to the round window niche. At an energy level of 500 mJ per 2.5 microseconds pulse, a repetition rate of 2 Hz, and an exposure time of 20-30 s, the photo-ablative mechanism of laser-bone interaction led to a 8-10 mm recanalization of the basal turn of the cochlea without damaging surrounding structures. The artificial bony occlusion and the recanalized basal turn of the cochlea were visualized by means of computed tomography and studied under light microscopy, using a histologic thin-section technique.

Aluminum Silicates↗
PubMed1994

[Experimental laser surgery of the ossified cochlea].

A pulsed holmium: YAG-laser (lambda = 2120 nm) was used to reopen the basal turn of artificially obliterated human cochleas in freshly dissected cadavers for intracochlear insertion of the stimulation electrode of a cochlear implant under simulated surgical conditions. Laser energy was transmitted through a 400 microns nylon fibre via the opened facial recess directly to the round window niche. At an energy level of 500 mJ/2.5 microseconds pulse, a repetition rate of 2 Hz, and an exposure time of 20-30 s, the photo-ablative mechanism of laser-bone interaction, which has only a limited thermal component, led to recanalisation of the basal turn of the cochlea in a length of 8-10 mm without damaging the surrounding structures. Light microscopic changes in the cochlea were evaluated following laser recanalisation. The artificial bony occlusion and the recanalised basal turn of the cochlea were visualised by means of computed tomography and histological thin section technique.

Cochlea↗
PubMed1994

[Possible applications of laser in otorhinolaryngology].

Laser therapy in otolaryngology--head and neck surgery using laser types working in the range of the visible and infrared part of the electromagnetic spectrum is well established. The laser types usually employed for micro- and macrosurgery of the aero-digestive tract and for microsurgery of the middle ear, involving thermal ablation of tissue and extensive areas of damage are described, as well as recent advances in laser technology for future use. The mechanisms by which non-thermal, photo-ablative pulsed solid-state crystal infrared and UV-excimer lasers and photodynamic therapy affect biological tissues are reported. The advantageous main areas of application of the different types of laser according to their physical properties are compared on the basis of the results of our own studies and the relevant literature.

Animals↗
PubMed1993

Infrared laser soft tissue ablation versus ultraviolet excimer laser. Experimental introduction of the Hol:YAG-laser in oral surgery.

The in vivo tissue ablation characteristics of a pulsed infrared laser (Hol:YAG, lambda = 2120 nm) and a pulsed excimer laser (XeCl, lambda = 308 nm) were studied in an animal model. Laser energy was delivered via nylon fibers for the Hol:YAG laser and via quartz fibers for the excimer laser. Laser incisions were made under precise reproducible conditions on the sublingual side of the tongue and the gingiva of white rats. Laser surgery was done at two different energy output settings for the Hol:YAG laser and at one setting for the excimer laser. Histologic studies revealed tissue defects with clean contours for both laser types with small zones of necrosis of the adjacent tissue (Hol:YAG: 180 microns to 640 microns; excimer: 40 microns to 160 microns) and without carbonization. Both laser types function on the principal of photoablation and permit excellent control of tissue ablation. Wound healing was studied over a 10-day period and showed complete wound closure by re-epithelialization. The in vivo tissue ablation characteristics and the surgical reliability of the two lasers are compared and discussed with respect to oral and periodontal surgery.

Animals↗