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Dive into the research topics where G. Omlor is active.

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Featured researches published by G. Omlor.


European Journal of Nuclear Medicine and Molecular Imaging | 1993

Rapid measurement of blood leakage during regional chemotherapy

Christof Alexander; G. Omlor; Berberich R; G. Gross; Gernot Feifel

In order to avoid complications after regional chemotherapy (isolated hyperthermic perfusion) of the extremities, rapid measurement of blood leakage from the extracorporeal to the systemic circulation is important. A method using technetium-99m in vivo red blood cell (RBC) labelling is reported that provides results within 3 min. Blood samples drawn from the systemic and the extracorporeal circulation were measured for 99mTc activity using a mobile well counter, and the leakage values calculated. The mean result was 7.6%±6.5%/15 min (n=209). The corresponding flow rate was 100.2±85.7 ml/15 min (mean ± SD). The values for isolation perfusion of the upper and the lower extremities are compared. The leakage results using 99mTc RBC labelling were correlated with other blood pool markers. Iodine-125 human serum albumin and indium-113 m transferrin were administered in subgroups of 4 and 19 patients simultaneously. Using linear regression, the coefficient of correlation was 0.72 for 99mTc/113mIn and 0.58 for 99mTc/125I. Comparison with the alternatives suggests that the rapid method of leakage measurement after 99mTc RBC labelling can be considered one of the most practicable and reliable methods available.


Langenbeck's Archives of Surgery | 1993

Kardiozirkulatorische Nebenwirkungen der hyperthermen Extremitätenperfusion

G. Omlor; Molter G; St. Meessen; G. Gross; U. Seyfert; Gernot Feifel

The risk of cardiocirculatory disorders was investigated in 23 consecutive patients with high-risk melanomas, who had been treated with hyperthermal limb perfusion. Postoperatively, there was a rise in the pulmonary vascular resistance. In addition, 14 patients with vascular occlusive diseases (1-2b, Fontaine) showed intraoperatively an increasing amount of leakage of the extracorporeal circulation. Elevations of thromboxane and prostacyclin in excess of the norm caused by mechanical and thermic traumatization of blood in the heart lung machine were detected in 8 patients investigated during and after the perfusion procedure. Significant increase of cisplatin, one of the two cytostatic agents injected extracorporeally, could not be demonstrated in the blood of the systemic circulation by atomic absorption spectroscopy. Increased pulmonary and arterial pressure disorders were observed in the group with occlusive vascular diseases, caused by a rising rate of vascular collaterals to the body and the rising rate of thromboxane and prostacyclin in the body blood flow. We believe that it is necessary to monitor pulmonary arterial pressure during isolated limb perfusion, especially in patients with vascular occlusive disease.Zusammenfassung23 konsekutiv mit einer hyperthermen Extremitätenperfusion behandelte Melanompatienten wurden im Hinblick auf kardiozirkulatorische Nebenwirkungen untersucht. Alle Patienten zeigten am Ende der Perfusion einen Anstieg des pulmonalen Gefäß-widerstands. 14 Patienten mit arteriellen Verschluß-krankheiten (AVK) (1-2 b nach Fontaine) zeigten wäh-rend der Perfusion ein höheres Shuntvolumen aus dem extrakorporalen Kreislauf. Bei 8 untersuchten Patienten ließ sich intraoperativ ein Anstieg von Mediatorstoffen des Arachidonsäurestoffwechsels (Thromboxan und Prostazyklin) wahrscheinlich als Folge einer mechanischen und thermischen Bluttraumatisierung im extrakorporalen Kreislauf nachweisen. Cisplatin, eines der beiden applizierten Zytostatika, wurde im Körperkreislauf mit atomabsorptionsspektroskopischen Messungen nicht gefunden. Die gemessenen Mediatorstoffe könnten für die beobachteten kardiozirkulatorischen Nebenwirkungen mitverantwortlich sein. Ein vermehrter Übertritt von Thromboxan und Prostazyklin aus dem extrakorporalen hin zum Systemkreislauf über Kollateralen zwischen den Extremitäten und dem Körperstamm könnte für die in der AVK-Gruppe beobachteten ausgeprägteren hämody-namischen Schwankungen (MAP, PAP) neben Volumenverschiebungen mitverantwortlich sein. Ein Monitoring des Pulmonalarteriendrucks zur exakteren Volumenbilanzierung während der Operationsphase ist bei Patienten mit AVK empfehlenswert.


Langenbeck's Archives of Surgery | 1991

Erste erfahrungen mit einem neuen monoklonalen Antikörper in der diagnostik maligner melanome

G. Omlor; R. Berberich; G. Gross; C. Alexander; Gernot Feifel

SummaryIn a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.ZusammenfassungAn 17 Patienten mit malignen Melanomen der Extremitäten wurden Sensitivität und Spezifität eines neuen gegen Melanomzellen gerichteten monoklonalen Antikörpers (BW 575, Fa. Behring) getestet. Während die Spezifität 100% betrug, lieβen sich in 3 Fällen die Melanomabsiedelungen mit diesem Antikörper nicht nachweisen (Sensitivität 70,0%). Bei nodulären Melanomen (9 Patienten) und deren Metastasen gelang der Tumornachweis immer. Durch Mehrfachuntersuchungen innerhalb der ersten 24 h nach Injektion des Tc-99m-markierten Antikörpers und Untersuchungen in 2 Ebenen gelang es bei den Antikörper speichernden Melanomen auch kleine Tumoren mit einem Durchmesser von weniger als 1 cm und subkutane Läsionen nachzuweisen. Die hohe Spezifität des Antikörpers könnte für eine Operationsplanung besonders wertvoll sein.In a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.


Langenbeck's Archives of Surgery | 1993

Technik und Ergebnisse der hyperthermen Extremitätenperfusion bei Melanompatienten

G. Omlor; E. Bahmer; S. Meessen; Zang D; Gernot Feifel; Zaun H

The results of hyperthermic isolated limb perfusion therapy in 36 patients with stage II–IV malignant melanoma of the extremities are presented. With the technique employed, neither severe complications nor functional deficiencies attributable to the perfusion therapy were observed. The findings on follow-up for up to 36 months are comparable to those reported in the literature, with survival rates of about 90% for stage II and III patients and nearly 50% for stage IV patients. Thus, our technique appears to be beneficial, especially in respect of the very low rate of side effects.ZusammenfassungDas Risiko und der Nutzen der hyperthermen Extremitätenperfusion bei Melanompatienten der Stadien II–IV wurden an 36 konsekutiv behandelten Patienten analysiert und mit der Literatur verglichen. Todesfälle oder bleibende Funktionsausfälle als Folgen der Extremitätenperfusion traten nicht auf, so daß die Perfusionsbehandlung als sichere Behandlungsmethode angesehen werden kann. Die nach der aktuarischen Methode berechneten Überlebensraten lagen in den Stadien II und III bei knapp 90% nach 36 Monaten, während sich im Stadium IV bezüglich der Überlebensrate keine Verbesserung der Prognose abzeichnete. Hauptprobleme der Methode sind der hohe Aufwand und die damit verbundenen Kosten Bowie die relativ geringen Einsatzmöglichkeiten. So ist durch die Perfusion nur ein Vorteil für die betroffenen Patienten zu erwarten, wenn es gelingt, das Patientenkollektiv zu definieren, das mit einer alleinigen Exzision mit Sicherheitsabstand nicht ausreichend behandelt ist.The results of hyperthermic isolated limb perfusion therapy in 36 patients with stage II-IV malignant melanoma of the extremities are presented. With the technique employed, neither severe complications nor functional deficiencies attributable to the perfusion therapy were observed. The findings on follow-up for up to 36 months are comparable to those reported in the literature, with survival rates of about 90% for stage II and III patients and nearly 50% for stage IV patients. Thus, our technique appears to be beneficial, especially in respect of the very low rate of side effects.


Archive | 1995

Radioimmunoscintigraphy of Malignant Melanoma with 99mTc-Labelled Monoclonal Antibody BW 575

Christof Alexander; R. Berberich; G. Omlor; S. Scheicher; E. Oberhausen; Gernot Feifel; H. Zaun; A. Steinsträßer

The present publication reflects our experiences using the Tc-99m labelled intact monoclonal antibody BW 575 for diagnostic use in patients with malignant melanoma. The collective included 45 patients with biopsy-proven malignant melanoma. Our results showed a sensitivity of 56 percent, a specificity of 72 percent and a positive/negative predictive value of 53/75 percent. We conclude that Tc-99m BW 575 is of limited value in the detection of malignant melanoma.


Langenbeck's Archives of Surgery | 1995

Extremitätenischämie als seltene Komplikation nach alloplastischem Gelenkersatz

Meyer A; G. Omlor; Gernot Feifel; Heinz Mittelmeier

Two cases of extremity ischemia after alloplastic knee and hip joint replacement are presented. In both cases early operative intervention led to complete recovery. The mechanisms of iatrogenic vascular injury following arthroplastic operations on the hip and knee joint are demonstrated. In particular, the importance of preexisting vascular occlusive disease is stressed. Diagnostic procedures and implications for treatment are discussed.ZusammenfassungEs werden 2 Fälle von postoperativ aufgetretenen Extremitätenischämien nach alloplastischem Gelenkersatz an Knie und Hüfte vorgestellt. In beiden Fällen führte die rechtzeitige operative Intervention zur Restitutio ad integrum. Die Ursachen iatrogener Gefäßschäden durch arthroplastische Operationen an Hüft- und Kniegelenk werden verdeutlicht. Dabei ist insbesondere die Erkennung vorbestehender arteriosklerotischer Gefäßwandveränderungen der gefährdeten Gefäßabschnitte von Wichtigkeit. Diagnostische Schritte werden erläutert und therapeutische Konsequenzen diskutiert.


Langenbeck's Archives of Surgery | 1991

Experience with a new monoclonal antibody in the diagnostic spectrum for melanomas

G. Omlor; R. Berberich; G. Gross; C. Alexander; Gernot Feifel

SummaryIn a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.ZusammenfassungAn 17 Patienten mit malignen Melanomen der Extremitäten wurden Sensitivität und Spezifität eines neuen gegen Melanomzellen gerichteten monoklonalen Antikörpers (BW 575, Fa. Behring) getestet. Während die Spezifität 100% betrug, lieβen sich in 3 Fällen die Melanomabsiedelungen mit diesem Antikörper nicht nachweisen (Sensitivität 70,0%). Bei nodulären Melanomen (9 Patienten) und deren Metastasen gelang der Tumornachweis immer. Durch Mehrfachuntersuchungen innerhalb der ersten 24 h nach Injektion des Tc-99m-markierten Antikörpers und Untersuchungen in 2 Ebenen gelang es bei den Antikörper speichernden Melanomen auch kleine Tumoren mit einem Durchmesser von weniger als 1 cm und subkutane Läsionen nachzuweisen. Die hohe Spezifität des Antikörpers könnte für eine Operationsplanung besonders wertvoll sein.In a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.


Langenbeck's Archives of Surgery | 1991

Erste erfahrungen mit einem neuen monoklonalen Antikrper in der diagnostik maligner melanome@@@Experience with a new monoclonal antibody in the diagnostic spectrum for melanomas

G. Omlor; R. Berberich; G. Gross; C. Alexander; Gernot Feifel

SummaryIn a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.ZusammenfassungAn 17 Patienten mit malignen Melanomen der Extremitäten wurden Sensitivität und Spezifität eines neuen gegen Melanomzellen gerichteten monoklonalen Antikörpers (BW 575, Fa. Behring) getestet. Während die Spezifität 100% betrug, lieβen sich in 3 Fällen die Melanomabsiedelungen mit diesem Antikörper nicht nachweisen (Sensitivität 70,0%). Bei nodulären Melanomen (9 Patienten) und deren Metastasen gelang der Tumornachweis immer. Durch Mehrfachuntersuchungen innerhalb der ersten 24 h nach Injektion des Tc-99m-markierten Antikörpers und Untersuchungen in 2 Ebenen gelang es bei den Antikörper speichernden Melanomen auch kleine Tumoren mit einem Durchmesser von weniger als 1 cm und subkutane Läsionen nachzuweisen. Die hohe Spezifität des Antikörpers könnte für eine Operationsplanung besonders wertvoll sein.In a study of 17 patients with malignant melanomas in the extremities the sensitivity and specificity of a new monoclonal antibody directed at melanoma cells (BW 575, Behring) were investigated. The specificity was 100%, but the sensitivity 70%. In 3 cases known foci could not be detected. All nodular melanomas and their metastases were detected (9 patients). Repeated examination during the first 24 h after injection of the Tc-99m-marked antibody, and two-plane investigations made it possible to detect even small tumors less than 1 cm in diameter and subcutaneous lesions where the melanomas absorbed the antibodies. Due to its high specificity, the antibody seems to be a promising aid in deciding the operative strategy.


Langenbeck's Archives of Surgery | 1995

Ischemia of the extremity as a rare complication of alloplastic joint replacement

Meyer A; G. Omlor; Gernot Feifel; Heinz Mittelmeier


Langenbeck's Archives of Surgery | 1995

Extremity ischemia as a rare complication of alloplastic joint replacement

Antje S. Meyer; G. Omlor; Gernot Feifel; Heinz Mittelmeier

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Zang D

Saarland University

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Zaun H

Saarland University

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