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DOI: 10.1055/s-0028-1109668
© Georg Thieme Verlag KG Stuttgart · New York
Sensitivität der Nervenfaserdarstellung mittels Scanning Laser Ophthalmoskop bei Glaukom
Sensitivity of Imaging the Peripheral Nerve Fibre Layer using a Confocal Scanning laser Ophthalmoscope to Detect GlaucomaPublication History
Eingegangen: 21.12.2008
Angenommen: 13.7.2009
Publication Date:
20 January 2010 (online)

Zusammenfassung
Hintergrund: Die Nervenfaserdarstellung mittels Scanning Laser Ophthalmoskopie kann Defekte der Nervenfaserschicht bei Glaukom identifizieren. In dieser Studie wurde die Sensitivität dieser Methode untersucht zur Abgrenzung primäres Offenwinkelglaukom (POWG) und Normaldruckglaukom (NDG) gegenüber Normalbefunden. Patienten und Methode: Vierundfünfzig Patienten mit POWG, 41 Patienten mit NDG und 65 Gesunde wurden in eine retrospektive Studie eingeschlossen. Die Nervenfaserdarstellung erfolgte mittels Scanning Laser Ophthalmoskopie (Argonlaser 488 nm). Digitalisierte Bilder der Nervenfaserschicht wurden von zwei Untersuchern ausgewertet. Die Nervenfaserschicht wurde für jedes Grad eines Auswertungskreises in 1,7 (zentral) und 3,4 mm (peripher) Abstand zum Zentrum des Sehnervenkopfes evaluiert (Defekt oder normal). Die nasalen 110 Grad wurden nicht ausgewertet. Die Sensitivität und Spezifität wurde mittels Receiver Operating Characteristic Curves (ROC) ermittelt. Ergebnisse: Die Patienten mit POWG zeigten Defekte der Nervenfaserschicht über 100° ± 94° (zentral und peripher) und Patienten mit NDG zeigten Defekte über 94° ± 94° (zentral) und 103° ± 92° (peripher). Diese waren signifikant größer als bei der gesunden Kontrollgruppe (1° ± 3° zentral und 1° ± 4° peripher, p < 0,0001). Die Sensitivität für POWG bei > 90 % Spezifität lag bei 79,6 % (zentral) und 81,5 % (peripher). Die Sensitivität für NDG bei > 90 % Spezifität lag bei 80,5 % (zentral) und 85,4 % (peripher). Bei frühem Glaukom (MD > –6 dB, n = 36) verringerte sich die Sensitivität auf 75 % (zentral) und 80,6 % (peripher). Diskussion: Die Evaluation der Nervenfaserdefekte bei Glaukom mittels Scanning Laser Ophthalmoskopie erreicht eine hohe Sensitivität auch bei Patienten mit frühem Glaukom.
Abstract
Purpose: The aim of this study was to evaluate the sensitivity to detect glaucoma by observer-dependent nerve fibre layer imaging and evaluation using a scanning laser ophthalmoscope. Patients and Methods: Fifty-four patients with primary open angle glaucoma (POAG), 41 patients with normal tension glaucoma (NTG) and 65 eyes of control subjects were included in a retrospective study. Nerve fibre layer imaging was performed using a confocal scanning laser ophthalmoscope (SLO, Rodenstock Instr., argon laser 488 nm). Digitised images of the nerve fibre layer were graded off-line by two masked experienced observers. The nerve fibre layer was graded for every single degree (defect or no defect) at 1.7 and 3.4 mm distance to the optic nerve head omitting the nasal 110 degrees. Sensitivity and specificity levels were calculated using ROC analysis. Results: Patients with POAG exhibited nerve fibre layer defects of 100° ± 94° (1.7 mm and 3.4 mm distance) and patients with NTG of 94° ± 94° (1.7 mm distance) and 103° ± 92° (3.4 mm distance), significantly larger compared to controls (1° ± 3° [1.7 mm, p < 0.0001] and 1° ± 4° [3.4 mm, p < 0.0001]). Sensitivity at > 90 % specificity was 80 % (1.7 mm) and 82 % (3.4 mm) for POAG. In NTG, sensitivity at > 90 % specifity was 81 % (1.7 mm) and 85 % (3.4 mm). In early glaucoma (MD < –6 dB, n = 39) sensitivity decreased to 75 % (1.7 mm) and 81 % (3.4 mm). Conclusion: Observer-dependent evaluation and grading of the nerve fibre layer using a scanning laser ophthalmoscope reaches considerably high sensitivity levels to detect glaucoma with negligible differences between the central and peripheral regions.
Schlüsselwörter
Glaukom - Nervenfaserschicht - Sensitivität - Scanning Laser Ophthalmoskop
Key words
glaucoma - nerve fibre layer - sensitivity - scanning laser ophthalmoscope
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PD Dr. Niklas Plange
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