Figure 6. Blood flow changes (%) in arterioles (A1-A4) and venules (Vc and V1) of the skinfold preparation during sodium pentobarbital (PB) anesthesia. Vc = small collecting venule. V1 = large venule. Bsln = baseline. Inf = PB infusion. All statistical comparisons were made against baseline in each group (anesthetized animals breathing spontaneously [PB-S] or ventilated with air [PB-V] and nonanesthetized animals [NaCl] receiving 0.9% sodium chloride) and between the PB-S and PB-V groups. *Significantly different from baseline (P < 0.05). Baseline blood flow and corresponding red blood cell velocity in each group are summarized in Table 2.