(2) Compared with normal rats, the dispersion of MAP90 [(LVMAP90- RVMAP90) (17 0±6 5 vs. 51 4±28 7, P <0 001)], the dispersion of ERP [(LVERP- RVERP) (4 0±2 2 vs.20 0±7 9) P <0 001] of myocardial infarction rats were increased signicicantly, the steady_state pacing cycle was 250 ms.
TpTe (the interval from T peak to T end on the same lead) did not change,but TpTe-max the interval from the earliest T peak to the latest T end across 12 leads, representing transmural dispersion of repolarization (TDR) : 0.21±0.09 s to 0.18±0.07s, P=0.02 significantly decreased.
In order to study the clinical significance of QT interval dispersion changes during acute myocardial infarction and its relation to the clinical practice,QT interval dispersion(QTD)was measured in 93 patients with acute myocardial infarction(MI)on admission and 4 weeks later,and compared with 80 normal subjects.
XRD pattern and SEM micrograph showed a good dispersion of ammonium carnallite and anhydrous magnesium chloride crystals with well-distributed big grains, just enough to meet the need for the production of magnesium metal in the electrolysis process.
TEM images revealed that a carbon encapsulated core/shell structure was formed in the composites, which could ensure good dispersion of carbon nanoparticles within the PMMA matrix.
Based on the characterization results, plasma treatment endowed the samples with smaller particle size, higher dispersion of active components, and an enrichment of active components on the surface as well.
The better the dispersion of the conduction grains, the larger the total effective area of the catalyst is.
The dispersion of nano-CaCO3 in the matrix of the polymer at the nanoscale was confirmed by scanning electron microscopy (SEM).