Circulation, Vol 90, 1502-1512, Copyright © 1994 by American Heart Association
J Sklenar, S Ismail, FS Villanueva, NC Goodman, WP Glasheen and S Kaul
BACKGROUND: Although dobutamine echocardiography is being increasingly used
to determine the presence of viable myocardium in patients who have
undergone successful reperfusion therapy, the physiological basis for such
a use has not been clearly defined. Because postischemic myocardium has
contractile reserve, we hypothesized that the absolute degree of wall
thickening induced by dobutamine during reflow would be directly related to
the amount of myocardium that has escaped necrosis. METHODS AND RESULTS:
Three groups of 12 dogs each were studied at baseline and during 2 to 6
hours of coronary artery occlusion and 15 minutes of reperfusion. In group
1 dogs, which did not receive dobutamine during any of these stages,
percent wall thickening at these stages was 32 +/- 6%, -2 +/- 6%, and 5 +/-
6%, respectively, and there was no relation between infarct size and
percent wall thickening during reflow (r = .20, P = .51). In group 2 dogs,
which received 15 micrograms/kg per minute of dobutamine at all stages,
wall thickening at these stages was 40 +/- 8%, 0 +/- 8%, and 19 +/- 10%,
respectively, and a good inverse correlation was noted between infarct size
and percent wall thickening during reflow (r = -.81, P = .001). In group 3
dogs, in which wall thickening during reflow was measured both before and
during infusion of 15 micrograms/kg per minute of dobutamine, it was 5 +/-
8% and 18 +/- 14%, respectively, at these stages. Although the correlation
between infarct size and percent wall thickening was poor in the absence of
dobutamine (r = .36, P = .26), an excellent inverse correlation was noted
between the two in the presence of dobutamine (r = -.93, P < .001). A
fair inverse correlation was also noted between infarct size and the
absolute change in wall thickening induced by dobutamine (r = -.72, P <
.01). Maximal wall thickening was noted at a dobutamine dose of 15
micrograms/kg per minute, and lower doses did not elicit thickening in the
presence of larger infarcts despite the presence of viable myocardium.
CONCLUSIONS: When myocardial necrosis coexists with post-ischemic
myocardial dysfunction and no residual coronary stenosis, the absolute
degree of wall thickening during dobutamine can be used to determine the
extent of myocardium that has escaped necrosis. The dose of dobutamine
needed to elicit maximal thickening of the postischemic myocardium is
related to the amount of myocardial necrosis.
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Dobutamine echocardiography for determining the extent of myocardial salvage after reperfusion. An experimental evaluation
Cardiovascular Division, University of Virginia, Charlottesville.
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