H. Dorge et al., Perfusion-contraction mismatch with coronary microvascular obstruction: role of inflammation, AM J P-HEAR, 279(6), 2000, pp. H2587-H2592
Citations number
29
Categorie Soggetti
Cardiovascular & Hematology Research
Journal title
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
A close relationship exists between regional myocardial blood flow (RMBF) a
nd function during acute coronary inflow restriction (perfusion-contraction
matching). However, the relationship of flow and function during coronary
microvascular obstruction is unknown. In 12 anesthetized dogs, the left cir
cumflex coronary artery was perfused from an extracorporeal circuit. After
control measurements, 3,000 microspheres (42 mm diameter) per milliliter pe
r minute inflow were injected to cause a microembolism (ME, n = 6). With un
changed systemic hemodynamics and RMBF, posterior systolic wall thickening
(PWT) decreased from 19.8 +/- 1.9% SD at control to 13.3 +/- 4.0, 10.3 +/-
3.8, and 6.9 +/- 4.7% (P < 0.05 vs. control) at 1, 4, and 8 h, respectively
. For comparison, inflow was progressively reduced to match PWT to that of
the ME group at 1, 4, and 8 h (stenosis, STE, n = 6). RMBF in the STE group
was reduced in proportion to PWT. Infarct size was not different among gro
ups (6.5 +/- 4.5 vs. 3.4 +/- 3.2%). However, the number of leukocytes infil
trating the area at risk was significantly greater in the ME group than in
the STE group. Coronary microembolization results in perfusion-contraction
mismatch and is associated with an inflammatory response.