Wz. Wang et al., ARTERIOLE CONSTRICTION FOLLOWING ISCHEMIA IN DENERVATED SKELETAL-MUSCLE, Journal of reconstructive microsurgery, 11(2), 1995, pp. 99-106
Arteriolar diameters and flow patterns were determined in the isolated
rat cremaster muscle following 4 hr of total ischemia. Two groups of
six rats each were studied-an innervated group and a denervated group.
The microcirculation was observed using intravital microscopy, and th
e images were recorded on videotape. The whole arterial tree was scann
ed, and the smallest vessel diameter for each arterial segment was mea
sured. Preischemic mean arteriole diameters were significantly larger
in the denervated group, compared to the innervated group. Following i
schemia, during the 3 hr of reperfusion, the main (A1) cremaster arter
iole from both the innervated and denervated groups constricted to 50
to 70 percent of pre-ischemic diameters. However, the actual diameters
(as distinct from percentage change) were not significantly different
between the innervated and denervated groups. There were significant
differences in now patterns. Some A2 and A3 vessels became temporarily
nonflowing vessels (either open but without flow, or closed by severe
spasm). These poorly-functioning vessels were significantly more comm
on in the denervated group. Furthermore, this phenomenon of temporary
no-now persisted longer in the denervated group over the 3-hr reperfus
ion period. These observations suggest that the ability to recover qui
ckly from an ischemic insult is less in tissues that have been denerva
ted.