Biomedical subjects

J Kollath

Publications and source records attributed to J Kollath.

At least 19 recordsLinked to original sources

PubMed2000

Late effects of therapy in 94 patients with localized rhabdomyosarcoma of the orbit: Report from the Intergroup Rhabdomyosarcoma Study (IRS)-III, 1984-1991.

BACKGROUND: We reviewed the late complications of therapy in 94 patients with localized, primary rhabdomyosarcoma of the orbit treated on the Intergroup Rhabdomyosarcoma Study (IRS)-III protocol (1984-1991). PROCEDURE: A questionnaire was sent to the institutions that had registered 106 patients with orbital RMS on the IRS-III protocol, seeking information about vision, periocular structures, and growth and development of the 102 survivors. RESULTS: Ninety-four questionnaires were returned. The median follow-up interval was 7.6 years. The affected eye was removed from 13 patients because of local recurrence (N = 10) or other causes (N = 3). Seventy-nine of the eighty-one remaining patients had received radiation therapy. Sixty-five of these seventy-nine patients (82%) developed a cataract, and 43 of them (66%) underwent cataract surgery. Fifty-five patients (70%) had decreased visual acuity. Twenty-four patients had a dry eye, and 22 had chronic keratitis, conjunctivitis, or corneal changes. Strabismus, diplopia, retinopathy, and uveitis were uncommon. The orbit was hypoplastic in 48 of 82 patients assessed (59%). Ptosis and enophthalmos were reported in 22 patients. Decreased statural growth was noted in 13 of the 53 irradiated patients aged 3-14 years at diagnosis with sufficient data (24%). CONCLUSIONS: The overall survival rate was 96% (102/106). The eye was preserved in 86% of the patients, but vision was impaired in 70% of them. Other frequent complications were cataract, orbital hypoplasia, keratoconjunctivitis, and ptosis/enophthalmos. The current IRS-V study recommends decreasing the dose of irradiation and using conformal techniques in an attempt to minimize these complications.

Adolescent↗

PubMed1999

Hypervascular spinal tumors: influence of the embolization technique on perioperative hemorrhage.

BACKGROUND AND PURPOSE: Corporectomy is an effective treatment for vertebral metastases; however, massive perioperative hemorrhage is often associated with this procedure. We compared preoperative particle, particle-coil, and coil embolizations of hypervascular spinal tumors prior to vertebral body replacement to determine which prevented perioperative hemorrhage most effectively. METHODS: The vertebral tumors of 59 patients were embolized prior to corporectomy. In 26 cases, only coils were used for the proximal occlusion of feeding segmental arteries. Twenty-four patients received a combination of polyvinyl alcohol (PVA) particles and coils, and nine tumors were embolized with particles alone. We compared intraoperative blood loss between the three groups and 10 other patients who did not undergo embolization prior to corporectomy. RESULTS: Estimation of intraoperative hemorrhage showed a median value of 4350 mL in patients without embolization, 2650 mL in cases of coil embolization, 1850 mL in cases of particle-coil embolization, and 1800 mL in cases of particle embolization. The difference between unembolized patients and those who underwent coil embolization was not statistically significant. Particle and particle-coil embolizations showed very similar results, and reduced hemorrhage significantly as compared to unembolized and proximal coil occlusion cases. Residual bleeding came from the venous system and the neighborhood of the embolized region. CONCLUSION: Particle embolization prior to corporectomy can reduce perioperative hemorrhage. The additional benefit of proximal coil occlusion of arterial feeders is questionable.

Adolescent↗

PubMed1998

CT findings in extensive tracheobronchial amyloidosis.

Primary pulmonary amyloidosis is a rare disorder that appears in three forms: tracheobronchial, nodular parenchymal, and diffuse parenchymal. We report the case of a 46-year-old women with extensive tracheobronchial amyloidosis which presented with a 2-year history of dyspnea and with signs of severe fixed obstruction in pulmonary function tests. Computed tomography of the thorax demonstrated marked thickening of the trachea and the central bronchial tree with substantial narrowing of the main, lobar, and segmental bronchi. Transbronchial specimen showed typical birefringence under polarizing microscope after staining with Congo Red. We did not find hints for systemic amyloidosis.

Amyloidosis↗

PubMed1998

Lymphocyte reconstitution after allogeneic blood stem cell transplantation for hematologic malignancies.

Forty-one patients were studied at set times after allogeneic blood stem cell transplantation (alloBSCT) for recovery of lymphocyte numbers and function. Cells were mobilized with G-CSF from HLA-matched related donors and cryopreserved. Graft-versus-host disease (GVHD) prophylaxis consisted of cyclosporine and methotrexate; G-CSF was administered post-transplant. Median time to absolute lymphocyte count (ALC) >500/microl was 17 days vs 41 and 49 days in historical alloBMT patients with G-CSF (n = 23) or no cytokine (n = 29) post-transplant, respectively (P < 0.0001). CD4/CD8+ ratio was 1.9 on day 28 after alloBSCT, then gradually declined to 0.8 at 1 year due to more rapid CD8+ cell recovery. Mean phytohemagglutinin-induced T cell responses were lower than normal on day +28 (P < 0.05), then tended to recover towards normal values. Natural-killer cytotoxicity remained low from day +28 to 1 year post-alloBSCT, but considerable lymphokine-activated killer cytotoxicity was induced from cells already obtained on day +28. Faster lymphocyte recovery correlated with better survival in alloBSCT patients (median follow-up 287 days, P = 0.002), ALC recovery was not affected by acute GVHD, CMV infections or doses of infused cells. ALC recovery did not correlate with survival in either historical alloBMT group. These data suggest that after alloBSCT lymphocyte reconstitution is faster than after alloBMT, and that quicker lymphocyte recovery predicts better survival in the alloBSCT setting.

Adult↗

PubMed1997

[Thrombosis of the inferior vena cava in Behçet disease].

Behçet's disease is considered to be a systemic process caused by a nonspecific vasculitis with a diversity of symptoms. It is defined by the coexistence of aphthous stomatitis, genital ulcerations, inflammatory conditions of the eye such as iritis and dermatological changes. Cardiovascular involvement includes both arteries and veins. We report an unusual case of thrombosis of the inferior vena cava with extensive collateral circulation of the superficial abdominal and paravertebral veins due to Behçet's disease diagnosed by phlebography and magnetic resonance imaging.

Behcet Syndrome↗

PubMed1997

[The computed tomographic determination of intra-abdominal fat volume by single-layer measurement].

PURPOSE: Several studies emphasised the importance of the relationship between intra-abdominal and total body adipose tissue as a risk factor for the development of metabolic or cardiovascular diseases. Therefore, the aim of the present study was to examine whether a single-scan computed tomography is able to determine the whole intra-abdominal fat volume with high accuracy and reproducibility. MATERIALS AND METHODS: Regions of interests (ROIs) were drawn manually for measuring intra-abdominal fat in 51 unsuspicious abdominal CT. RESULTS: The sexual differentiation of adipose tissue already described in a lot of studies could be confirmed in this study. Fat still predominates in females in lower half of the body (gynecoid obesity). In men it predominates in the upper half (android obesity). Significant correlation concerning measuring the whole intra-abdominal fat volume could be found in L1-level in women (r = 0.992) and in L2-level in men (r = 0.992). Measurement of a single scan enables us to assess whole intra-abdominal fat volume due to a special formula. CONCLUSION: The determination of intra-abdominal fat measured by a single-scan computed tomography is a procedure associated with high accuracy and reproducibility.

Adipose Tissue↗

PubMed1997

Balloon dacryocystoplasty: indications and contraindications.

PURPOSE: To define the indications and contraindications for balloon dacryocystoplasty. MATERIALS AND METHODS: Eighty-five patients with severe epiphora due to partial (n = 47) or complete (n = 38) obstruction of the nasolacrimal duct (NLD) were treated with balloon dacryocystoplasty (DCP). Steerable micro-guide wires with flexible tips were used. Success rates of DCP were evaluated clinically and dacryocystographically during the acute phase and at 6- and 12-month follow-up. Failures and recurrences were correlated with clinical and dacryocystographic indications for treatment. RESULTS: Recanalization was successful in 35 (92%) of 38 patients with isolated focal stenoses (n = 20) or short-distance occlusions (n = 18) of the NLD. Among all 85 patients, recanalization was successful in 25 patients (66%) with complete and 37 patients (79%) with partial obstructions. In the absence of the main predictors for recurrent obstructions (ie, active inflammation, filling defects due to calculi, long-distance occlusions, and posttraumatic lesions), 12-month patency rates were 89% (17 of 19 focal stenoses) and 94% (15 of 16 focal occlusions). Otherwise, reobstruction rate was 46% (12 of 26 cases). CONCLUSION: Balloon dacryocystoplasty is successful only in select cases. To achieve results comparable to those of operative treatment, the indication should be limited to patients with circumscribed focal stenoses or occlusions of the NLD. Active dacryocystitis, dacryocystolithiasis, and posttraumatic lesions are the main contraindications.

Catheterization↗

PubMed1997

Hematopoietic recovery after allogeneic blood stem-cell transplantation compared with bone marrow transplantation in patients with hematologic malignancies.

PURPOSE: To compare hematopoietic recovery, duration of hospitalization, and 100-day survival in patients who received allogeneic-blood stem cells (BSC) or conventional allogeneic bone marrow transplantation (BMT). PATIENTS AND METHODS: From December 1994 to August 1995, 21 patients participated in a phase II study of allogeneic BSC transplantation. Cells mobilized with granulocyte colony-stimulating factor (G-CSF; 5 micrograms/kg/ d) were collected from human leukocyte antigen (HLA)-matched related donors and cryopreserved. Graft-versus-host disease (GVHD) prophylaxis consisted of cyclosporine and methotrexate. G-CSF (10 micrograms/kg/d) was administered posttransplant. The outcomes were compared with 22 identically treated historical patients who received allogeneic BMT. RESULTS: The median infused CD34+ cell and granulocyte-macrophage colony-forming unit (CFU-GM) content were 7.73 x 10(4)/kg and 41.6 x 10(4)/kg, respectively. The median time to a neutrophil count greater than 500/ microL was 11 days after BSC and 16.5 days after BMT (P = .0003). A trend toward faster platelet and RBC recovery after BSC was observed. BSC patients received fewer platelet transfusions: 10 versus 19 (P = .015). The median length of hospitalization was shorter after BSC transplantation: 25 versus 31.5 days (P = .0243). The 100-day survival rates were similar: 83% after BSC and 75% after BMT (P = .3585). The incidence of acute GVHD grade II to IV was 57% and 45% for BSC and BMT, respectively (P = .4654). CONCLUSION: In comparison to BMT, allogeneic BSC transplantation may result in faster hematopoietic recovery, shorter hospital stay, and similar early survival. Whether allogeneic BSC are superior to bone marrow needs to be determined in randomized trials.

Adult↗

PubMed1997

[Radiologic appearance of primary anomalies of the lymphatic vessel system of the lung. Review and personal results].

Congenital disorders of the lymphatics of the lung are rare. On the basis of a literature review and our own experiences the disorders are divided into four groups and their radiographic findings are described. Pulmonary lymphangiectasia shows not typical signs. As an expression of the underlying pathophysiologic processes CT shows thickening of interlobular septs, interstitial edema and pleural effusions. Neither architectural distraction nor thickening of intralobular septs was seen. Lymphangioleiomyomatosis shows rather typical findings with multiple thin-walled bullae. In contrast to the opinion that architectural distraction is not seen in LAM we sometimes found signs of fibrosis. Disseminated pulmonary lymphangioma is characterised by proliferation of lymph vessels. CT-findings of this disorder have not been described before. CT shows multiple disseminated nodules of up to 2.5 cm accompanied by multiple bullae of similar distribution and size.

Humans↗

PubMed1996

192IR endovascular brachytherapy for avoidance of intimal hyperplasia after percutaneous transluminal angioplasty and stent implantation in peripheral vessels: 6 years of experience.

PURPOSE: Percutaneous transluminal angioplasty (PTA) with or without stent implantation is the accepted standard in the therapy of occlusive arterial disease. Despite improvements in the technique and medical equipment, there is still a restenosis rate of up to 40%. A high-dose-rate afterloading technique to avoid vascular stenosis or occlusion after PTA and subsequent stent implantation caused by intimal hyperplasia is presented with long-term results. METHODS AND MATERIALS: Intravascular brachytherapy with a 10-Ci 192Ir source was performed in cases of recurrent vascular occlusion or stenosis which appeared within 6 months after a previous PTA. After recanalization by PTA and stent implantation, a 9-Fr ReKa catheter was positioned within the stent to center the applicator with its tip 2 cm below the stent. This catheter served as a guide for a 5-Fr flexible applicator. After this procedure the isodose was calculated and a 12-Gy to 3-mm source distance was applied. The procedure was followed by 72 h of heparinization. RESULTS: From May 1990 to June 1996, 28 patients (21 male and seven female) were treated with endovascular brachytherapy. All patients had a clinically relevant restenosis or reocclusion of the arteria femoralis. Follow-up time ranged from 1 to 71 months. Twenty-eight patients had a sufficient follow-up time; 25 of these patients were examined. Twenty-one patients had treated vessel segments; four patients had no flow in the treated area. Two patients moved away with unknown addresses, and one patient died without any follow-up examination. Radiation-associated side effects were not notable. CONCLUSION: Intraluminal brachytherapy with 192Ir is a safe and useful procedure to avoid endovascular hyperplasia after transluminal percutaneous angioplasty.

Aged↗

PubMed1996

[Quality assurance measures within DIN 6856: the adaptation of film viewing boxes and their specifications in the radiology department of a university hospital. Deutsche Industrie-Norm].

PURPOSE: The aim of our study was to examine the quality and consistency of film viewing equipment and surroundings for radiological film viewing as stipulated by the recently released DIN 6856 standard specifications sheet. METHODS: 107 film viewers in 43 locations in the Department of General Radiology (Hospital of the Goethe University in Frankfurt, Germany) were examined with regard to viewer brightness (intrinsic luminous intensity) uniformity of viewbox brightness, colour of fluorescence tubes, dimensions, adjustable filters, positioning of the viewers and ambient light level. RESULTS: Requirements regarding brightness were met in 70%, whereas conditions regarding uniformity of brightness were fulfilled in only 27% and the required filters in only 20% of all cases. CONCLUSIONS: 89% of the examined film viewboxes did not comply with the strict specifications laid down in DIN 6856. The requirements regarding the ambient light level (recommended range 50-100 lx) were met by only 75% of the examined desks.

Germany↗

PubMed1996

[The remineralization of the vertebral metastases of breast carcinoma after radiotherapy].

BACKGROUND: The early detection of effects caused by radiotherapy on bone mineralisation has influence on clinical treatment. Usually the follow-up is done by conventional X-rays, presenting a loss of calcification of at least 30%. Quantitative CT-measurements are much more sensitive. PATIENTS AND METHODS: In a prospective study we evaluated the CT-scans of 14 patients with multiple vertebral metastases of mamma carcinoma. Our patients underwent SEQCT (one 10 mm slice in each affected vertebral body, 80 kV, 250 mAs) before and immediately after radiation therapy (total dose 30 Gy to 36 Gy) followed by further examinations 6 weeks and 3 months later. RESULTS: While there is no significant change in increased BMD (bone mineral density) of osteosclerotic and decreased BMD of osteolytic metastases just after therapy, the following examinations present an increase of BMD in osteolytic metastases 6 weeks after therapy more distinct 3 months after. Osteosclerotic metastases show a decline in bone density. In mixed metastases is no significant change while normal bone lying in the irradiation field demineralizes. Additive chemotherapy is very important especially for mineralisation of lytic metastases. Referring to mixed metastasis in one vertebral body we suggest a separate evaluation of the left and right side. CONCLUSION: Mineralizing effects of radiation therapy depend on the characteristics of the metastases. Supported by QCT histopathological change can be documented and exactly demonstrated to the clinician.

Adult↗

PubMed1994

Endovascular irradiation--a new method to avoid recurrent stenosis after stent implantation in peripheral arteries: technique and preliminary results.

PURPOSE: A high dose rate (HDR) afterloading technique for prevention of vascular stenosis or occlusion after percutaneous transluminal arteriography and subsequent stent implantation caused by intimal hyperplasia is presented. METHODS AND MATERIALS: The frequency of recurrent stenosis or occlusion following implantation of stents into peripheral arteries is relatively high. The cause of relapse is rapid intimal hyperplasia. To prevent proliferation of the intimal layer, intravascular brachytherapy was performed in cases of recurrent vascular occlusion or severe stenosis. After recanalization by percutaneous transluminal angioplasty and stent implantation, a 9-French-ReKa catheter was placed within the lumen of the stent. This catheter served as a guide for a 5-French flexible applicator. Then after individual calculation of the isodose, 12 Gy were applied to the vessel wall. This procedure was followed by 72 h of heparinization. Follow-up by Doppler digital subtraction angiography and magnetic resonance imaging was done 3, 6, and 12 months after the procedure and later on once a year. RESULTS: Intraluminal irradiation was performed in 13 patients (nine male and four female). All patients had a clinically relevant restenosis or reocclusion in the superficial femoral artery (clinical stage according to Fontaine IIb-III). Follow-up time ranged from 3-27 months. After irradiation the stented area remained patent in all cases and there were no signs of recurrent stenosis in the treated arterial segment. CONCLUSION: With high dose rate 192Ir afterloading after percutaneous transluminal angioplasty and subsequent stent implantation restenosis or reocclusion caused by intimal hyperplasia can be prevented.

Aged↗

PubMed1994

Noninvasive methods in the early detection of restenosis after percutaneous transluminal angioplasty in peripheral arteries.

In a prospective study, several noninvasive methods were evaluated in the early detection of restenosis after percutaneous transluminal angioplasty in peripheral arteries. Sensitivity and specificity of various noninvasive resting and exercise methods for the detection of restenosis were determined. It is concluded that noninvasive follow-up after percutaneous transluminal angioplasty in peripheral arteries requires exercise testing with determination of ankle-arm index or segmental arterial pulse oscillography for the early detection of restenosis.

Aged↗

PubMed1994

[Intervention and clinical aspects combined with endovascular irradiation of intimal hyperplasia of the vascular system].

After implantation of stents in femoropopliteal arteries we found restenosis or occlusions by intimal hyperplasia in up to 40% especially in the hunter's channel. Repeated balloon angioplasty and prophylactic endovascular radiotherapy with a surface dose of 12 Gy in the vessel wall using an iridium 192 source in the same investigational session is a new technique to reduce or eliminate further recurrence. All 18 patients had developed recurrent stenoses or occlusions 6-8 months after original stent implantations. The patients have not redeveloped recurrent obstructions after this treatment, which up to date showed no short term or long term complications. We conclude that the encouraging results of this pilot study justify further randomized trials.

Aged↗

PubMed1994

[Noradrenaline-assisted selective chemoembolization of hepatocellular carcinoma].

Despite the postulated tumour affinity of Lipiodol is liver dysfunction after chemoembolization of hepatic malignancies common. Vasoconstricting action of noradrenaline to protect non malignant tissue was studied. 70 patients with unresectable HCCs (UICC IV: 61%) were treated via percutaneous catheter. After noradrenaline (0.1-0.8 mg) induced and documented vessel constriction a suspension of Lipiodol (5-8 ml) and Mitomycin C (10-20 mg) was injected. In addition minced dehydrated dura suspended in Lipiodol occluded the major tumour feeding vessels. 120 (73%) of a total of 164 chemoembolizations were performed after intrahepatic noradrenaline (0.1-0.8 mg) bolus injection. Arterial perfusion of non malignant liver parenchyma was significantly reduced in 95%. 24 hours later selective tumor retention of lipiodol was noticed in 67%. Side effects were fever (79%), thoracoabdominal pain (67%), nausea and emesis (43%) and tachycardia (15%). There were two treatment related deaths: one each from liver failure and cardiac arrest. By WHO response criteria there were 17 (23%) partial remissions (PR), 34 (49%) stable diseases (SD) and 20 (28%) patients had progression (PD). The median survival time from initiation of treatment was 312 days. Bilobal and multiple tumors reduced survival time (90 days). These findings suggest that noradrenaline guided chemoembolization is feasible in Europe and even in patients with pylethrombosis well tolerated.

Adult↗

PubMed1993

Recanalization of chronic arterial occlusions: low-speed rotational angioplasty. 5 years experience in peripheral and coronary vessels.

Chronic complete occlusions still represent the major technical limitation of percutaneous transluminal angioplasty, both in peripheral and coronary vessels. The clinical use of low-speed rotational angioplasty started in 1986 for the peripheral and in 1987 for the coronary arteries, and has already become part of the clinical routine in several centres. Up to now more than 350 patients with peripheral and 250 patients with coronary occlusions have been treated in Frankfurt; a multicentre questionnaire already contains information about 1,252 patients with peripheral vessel obstructions. In peripheral occlusions the acute success rate was more than 80% if low speed rotational angioplasty was used as the first attempt; after failure of conventional techniques still more than 60% of the vessels could be recanalized successfully. In addition to occlusions of the arteries of the lower limb, indications now may include the iliac artery and the subclavian artery. In each of the patients with chronic coronary occlusions an attempt with conventional techniques had failed before. Following a learning curve, which was also influenced by a better understanding of morphological preconditions, the acute success has now reached 70%. Both in patients with peripheral and those with coronary occlusions the technique turned out to be a safe procedure. Early angiographically documented long-term results in both indications are comparable with conventional balloon techniques. It is concluded that the use of low-speed rotational angioplasty (ROTACS) can improve the results of non-operative invasive treatment, both in peripheral and in coronary arteries.

Angioplasty↗

PubMed1992

[Reopening chronic arterial occlusions].

Chronic complete occlusions still represent the major technical limitation of percutaneous transluminal balloon angioplasty, both in peripheral and coronary vessels. The clinical use of low speed rotational angioplasty (ROTACS) started in 1986 for the peripheral and in 1987 for the coronary vessels, and has already become part of the clinical routine in several centers. Up to now, more than 300 patients with peripheral and more than 200 patients with coronary occlusions were treated in Frankfurt. In peripheral occlusions the acute success rate was more than 80% if used as the first attempt; after failure of conventional techniques still more than 60% of the vessels could be recanalized successfully. In addition to occlusions of the arteries of the lower limbs, the indication now includes the iliac artery and several other indications are under investigation. In each of the patients with chronic coronary occlusions an attempt with conventional techniques had failed before. Following a learning curve, which was also influenced by a better understanding of morphological preconditions, the acute success rate has now reached 70%. Both in patients with peripheral and those with coronary occlusions no deaths occurred. First angiographically documented long-term results in both indications are comparable to conventional balloon angioplasty. It is concluded that the use of low speed rotational angioplasty (ROTACS) can improve the results of nonoperative invasive treatment, both in peripheral and in coronary arteries.

Angiography↗