Key result
Enhanced 201Tl activity after reinjection links to ~32% less myocardial interstitial fibrosis versus no enhancement.
Why the study?
Does stress planar 201Tl scintigraphy with tracer reinjection at rest improve the assessment of myocardial interstitial fibrosis compared to conventional stress-redistribution images in patients with chronic coronary artery disease and ≥ 75% LAD stenosis?
Observational (n=37)
Does stress planar 201Tl scintigraphy with tracer reinjection at rest improve the assessment of myocardial interstitial fibrosis compared to conventional stress-redistribution images in patients with chronic coronary artery disease and ≥ 75% LAD stenosis?
Absolute Event Rate: 28% vs 41%
p-value: p=0.031
Residual 201Tl activity in reinjection images correlates strongly with preserved viable myocytes, serving as a reliable marker of myocardial viability in irreversible perfusion defects.
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May refine viability assessment in irreversible defects; leaves open outcome impact of reinjection over redistribution in chronic CAD.
Zimmermann et al. (1995) conducted an observational in chronic coronary artery disease (n=37). Enhanced regional 201Tl activity after tracer reinjection vs. No enhancement of tracer activity after reinjection was evaluated on Amount of interstitial fibrosis (vol%) (p=0.031). Enhanced regional 201Tl activity after tracer reinjection was associated with significantly lower myocardial interstitial fibrosis compared to no enhancement (28 vs 41 vol%; P=0.031).
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