Myocardial infarction: assessment with an intravascular MR contrast medium. Work in progress.
The effect of a new intravascular magnetic resonance (MR) contrast medium (gadolinium diethylenetriaminepentaacetic acid [DTPA] polylysine) was evaluated in acute, subacute, and chronic myocardial infarctions in rats. Signal intensity (SI) was measured before and after intravenous administration of Gd-DTPA polylysine. Before administration of contrast material, chronic infarctions had lower SI than normal myocardium. With Gd-DTPA polylysine, three zones were identified in acute and subacute stages of myocardial infarction, but in the chronic stage, images demonstrated two zones. In acute and subacute infarctions, Gd-DTPA polylysine produced greater enhancement (over 60 minutes) in the peri-infarction zone than in the normal or infarcted myocardium. In chronic infarctions, Gd-DTPA polylysine had no discernible effect on the SI of the central infarction zone. Overall, it caused no significant hemodynamic effects. MR imaging with Gd-DTPA polylysine produced differential tissue enhancement in myocardial infarctions, which varied according to the age of the infarction.
Saeed
M
M
Department of Radiology, University of California, San Francisco 94143.
Wendland
M F
MF
Masui
T
T
Connolly
A J
AJ
Derugin
N
N
Brasch
R C
RC
Higgins
C B
CB
D000818:Animals; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006439:Hemodynamics / Q000187:drug effects; D008279:Magnetic Resonance Imaging; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D009206:Myocardium / Q000473:pathology; D009942:Organometallic Compounds / Q000494:pharmacology; D004369:Pentetic Acid / Q000494:pharmacology; D011107:Polylysine / Q000494:pharmacology / Q000031:analogs & derivatives; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
D003287:Contrast Media; D009942:Organometallic Compounds; C068674:polylysine-(Gd-DTPA); D011107:Polylysine; D004369:Pentetic Acid; D019786:Gadolinium DTPA