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DOI: 10.1055/s-0030-1254160
© Georg Thieme Verlag KG Stuttgart · New York
Belastungsrenografie bei essenzieller Hypertonie
Exercise Renography in Essential HypertensionPublikationsverlauf
Publikationsdatum:
10. September 2010 (online)
Zusammenfassung
Die Belastungsrenografie mit 99mTc-Mercapto-acetyltriglycin (99mTc-MAG3) ermöglicht es, eine krankheitsspezifische renale Funktionsstörung der essenziellen Hypertonie nachzuweisen. Szintigrafisch wird die Störung bei Belastung erkennbar als deutliche, bilaterale parenchymale Tracerretention. Clearancebestimmungen bei Belastung zeigten, dass diese Tracerretention Ausdruck einer ausgeprägten Minderung der glomerulären Filtrationsrate (GFR) ist, während der effektive renale Plasmafluss (ERPF) vergleichsweise unverändert blieb. Die bislang mit der Belastungsrenografie und mit Clearancebestimmungen erhobenen Ergebnisse weisen darauf hin, dass die physiologisch stabile Filtrationsfraktion (FF) (FF=0,2) bei etwa 60% der Patienten mit essenzieller Hypertonie hochgradig pathologisch wird (FF< < 0,2). Die Funktionsstörung muss zu einer Aktivierung der Renin-Angiotensin-Achse führen. Die Tatsache, dass mittels einer einfachen 99mTc-MAG3-Nierenszintigrafie eine erniedrigte FF erkannt werden kann, eröffnet Forschungsmöglichkeiten auch außerhalb der essenziellen Hypertonie. Erste Ergebnisse bei renovaskulärer Erkrankung sowie Obstruktion zeigten, dass eine erniedrigte FF eine Gefährdung der Niere anzeigen kann.
Abstract
Exercise renography using 99mTc-mercaptoacetyltriglycine (99mTc-MAG3) permits recognition of a disease specific renal functional disturbance of essential hypertension. This disturbance can be visualized scintigraphically as pronounced bilateral parenchymal/tissue tracer retention. Clearance determinations during light ergometric exercise demonstrated that transitory bilateral tissue tracer retention results from a selective and prominent reduction of glomerular filtration, while effective renal plasma flow (ERPF) remains comparatively stable. Results obtained with exercise renography and with clearance determinations suggest that the physiological relationship between glomerular filtration rate (GFR) and ERPF, i. e. a filtration fraction (FF) of 0.2, is severely disrupted (FF << 0.2) in about 60% of patient with essential hypertension. This functional disturbance must result in the activation of the renin-angiotensin axis. A particularly exciting consequence of this research was the recognition that 99mTc-MAG3-scintigraphy can visualize a reduced FF. This opens the door to a broad area of research unrelated to essential hypertension. Initial results in renovascular disease and in urinary tract obstruction demonstrated that a reduced FF puts the involved organs at risk.
Schlüsselwörter
essenzielle Hypertonie - Nierenszintigrafie - Belastungsrenografie
Key words
essential hypertension - renal scintigraphy - exercise renography
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Korrespondenzadresse
Dr. Andreas Schlotmann
Universitätsklinikum Freiburg
Radiologisches Zentrum
Radiologische Klinik und
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79106 Freiburg
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