Relaxation enhancing properties of MnDPDP in human myocardium

Arne Skjold, Torgil R Vangberg, Anders Kristoffersen, Olav Haraldseth, Per Jynge, Henrik B W Larsson

20 Citationer (Scopus)

Abstract

PURPOSE: To assess magnitude and duration of changes in myocardial longitudinal relaxation rate (R1) in humans following infusion of the manganese (Mn) releasing contrast agent MnDPDP (Mn-dipyridoxyl-diphosphate).

MATERIALS AND METHODS: Fifteen healthy volunteers were divided into three groups. After initial myocardial and liver R1 measurements using an inversion recovery (IR) turbo fast low-angle shot (FLASH) sequence at 1.5 Tesla, the groups were given different doses of intravenous MnDPDP: 5, 10 and 15 micromol/kg body weight, respectively, over 30 minutes. R1 measurements were then repeated at 1, 2, 4, 8, and 24 hours after the infusion ended.

RESULTS: The left ventricular wall R1 prevalue was 0.98 second(-1) (+/-0.04). R1 increased on average (all 15 subjects) 0.41 second(-1) (+/-0.09). The increase was present one hour after the end of the infusion, remained relatively constant the next two hours, and then declined gradually. After 24 hours, there was still a moderate R1 elevation present, with an average R1-value of 1.16 (+/-0.05). There were only small differences in myocardial R1 responses between the three doses investigated, which was contrasted by a marked dose-response in liver tissue.

CONCLUSION: MnDPDP gave a significant and prolonged rise in myocardial R1 even at a dose of 5 micromol/kg. The R1-values in the myocardium did not increase linearly with higher doses.

OriginalsprogEngelsk
TidsskriftJournal of magnetic resonance imaging : JMRI
Vol/bind20
Udgave nummer6
Sider (fra-til)948-52
Antal sider5
ISSN1053-1807
DOI
StatusUdgivet - dec. 2004
Udgivet eksterntJa

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