PMID: 9420706May 1, 1994Paper

Transcapillary exchange of indium 111-labeled anticardiac myosin Fab and thallium 201 in isolated reperfused rabbit hearts

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
D J Meerdink, J A Leppo

Abstract

The physiologic mechanisms of 111In-labeled anticardiac myosin antibody [111In]-AM) imaging are fairly well established. However, to better understand the transcapillary exchange characteristics of normal and reperfused myocardium, a standard first-pass, indicator-dilution analysis was undertaken in hearts subjected to global no-flow and low-flow ischemia. The first-pass myocardial transport of 201Tl and [111In]-AM was evaluated in an in vitro rabbit model of no-flow ischemia/reperfusion with indicator-dilution analysis during normal and ischemic flows and whole-blood perfusate. The maximum extraction fraction (Emax) of 201Tl was dominated by flow rate as expected and averaged 0.75 (+/- 0.009) and 0.57 (+/- 0.008) during ischemic and normal flows, respectively (p < 0.01). Emax values for [111In]-AM, which were 0.02 or less in all hearts at control, increased to 0.06 or greater at moderate to longer perfusion times after 50 or more minutes of no-flow ischemia. Permeability surface area (in milliliters per minute per gram) tended to decline for 201Tl with longer reperfusion periods in both ischemic and normal flow groups and paralleled the changes observed for Emax for [111In]-AM. These data demonstrate that the first-pass extrac...Continue Reading

References

Aug 1, 1991·The American Journal of Physiology·N J Willumsen, R C Boucher
May 1, 1982·The International Journal of Applied Radiation and Isotopes·D J HnatowichR L Childs
Mar 1, 1960·The Journal of General Physiology·L J MULLINS, R D MOORE

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