title: Improved detection of acute myocardial infarction by magnetic resonance imaging using gadolinium-DTPA.
abstract: To assess the value of the paramagnetic contrast agent Gadolinium (Gd)-DTPA in Magnetic Resonance Imaging (MRI) of acute myocardial infarction (AMI), we studied 20 patients with a first AMI by ECG-gated MRI before and after intravenous administration of 0.15 mmol/kg Gd-DTPA. The MRI studies were performed after a mean of 98 hours (range 15-241) after the acute onset of AMI. Spin-echo measurements (TE 30 msec) were made using a Philips Gyroscan (0.5 Tesla). After performing the baseline MRI scans, the MRI procedure was repeated every 10 minutes for up to 40 minutes following injection of Gd-DTPA. In 18 (90%) patients contrast enhancement in the infarcted myocardial areas was observed after Gd-DTPA. In these patients intensity versus region curves, derived from 9 to 11 adjacent myocardial regions of interest, showed increased signal intensities in the infarcted areas after administration of Gd-DTPA. The precontrast signal intensity ratio between infarcted and normal myocardium was 1.14 +/- 0.15 (mean +/- SD); the postcontrast ratios at 10 minutes were 1.41 +/- 0.21 (P less than 0.05), at 20 minutes 1.61 +/- 0.19 (P less than 0.01), at 30 minutes 1.43 +/- 0.20 (P less than 0.05), and at 40 minutes 1.33 +/- 0.20 (P = NS). It is concluded that MRI using the contrast agent Gd-DTPA significantly improves the visualization and detection of infarcted myocardial areas in patients with AMI and that optimal contrast enhancement is obtained 20 minutes after administration of Gd-DTPA.
authors.affiliation: Department of Cardiology, University Hospital Leiden, The Netherlands.
authors.forename: P R
authors.initials: PR
authors.lastname: van Dijkman
authors.forename: J
authors.initials: J
authors.lastname: Doornbos
authors.forename: A
authors.initials: A
authors.lastname: de Roos
authors.forename: A
authors.initials: A
authors.lastname: van der Laarse
authors.forename: S
authors.initials: S
authors.lastname: Postema
authors.forename: N A
authors.initials: NA
authors.lastname: Matheijssen
authors.forename: A V
authors.initials: AV
authors.lastname: Bruschke
authors.forename: A E
authors.initials: AE
authors.lastname: van Voorthuisen
authors.forename: V M
authors.initials: VM
authors.lastname: Cats
authors.forename: E E
authors.initials: EE
authors.lastname: van der Wall
mesh_terms: D000328:Adult; D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D009942:Organometallic Compounds; D004369:Pentetic Acid; D013997:Time Factors
chemical_list: D009942:Organometallic Compounds; D004369:Pentetic Acid; D019786:Gadolinium DTPA