Serial imaging of @entity235 XXXX by in vivo nuclear magnetic resonance.

@entity235 @entity583 @entity1188
Anterior @entity1188 was produced in eight @entity235 to characterize serial changes in nuclear magnetic resonance signal intensity within the @entity1188 zone. Magnetic resonance imaging was done on the day of @entity1188 , on day 4, 5 or 6, on day 13 and day 20 using a 0.15 tesla (6.25 MHz) resistive imager. Electrocardiographically triggered spin echo (30, 45 and 60 ms echo times) and inversion recovery (400 to 500 ms inversion time) pulse sequences were employed to obtain single slice images. On day 20, the excised hearts were sectioned and examined to determine @entity1188 location and extent. In the spin echo images, signal intensity within the ischemic zone was visibly increased in seven of the eight @entity235 on the day of @entity1188 , and in all @entity235 by days 4 to 6. Signal intensity remained elevated in all but two @entity235 at day 20. With inversion recovery imaging, changes in the @entity1188 zone were highly variable; both ill defined increases and decreases in signal intensity were noted. With a 30 ms echo time, signal intensity in the @entity1188 zone was increased on average 29.8 +/- 24.1% above that in normal myocardium on the day of @entity1188 . The relative signal intensity increased to 62.4 +/- 23.5% during the first 2 weeks after @entity1188 (p less than 0.05), then decreased to 12.0 +/- 18.5% by day 20 (p less than 0.05). Similar changes were detected in the images using the 45 and 60 ms echo times. Nuclear magnetic resonance imaging therefore is able to detect regions of @entity583 and follow evolutionary changes in signal intensity within the @entity1188 zone with healing.
