Drag reduction by polyethylene glycol in the tail arterial bed of normotensive and hypertensive rats. K.L. Bessa, J.F. Belletati, L. dos Santos, L.V. Rossoni
and J.P. Ortiz. Braz J Med Biol Res 2011; 44: 767-777.

Figure 2. Effect of PEG 4000 perfused at the flow rate of 2.5 mL/min on the pulsatile pressure acquired from tail arterial beds with intact endothelium (E+) (A and B, respectively) and after endothelial damage (E-) of Wistar rats and spontaneously hypertensive rats (SHR) (C and D, respectively). KHB = Krebs-Hanseleit-buffered solution. Relative time was calculated as actual time (t1) divided by total time (tt). N = 4-6 animals in each group. *P < 0.05 for KHB vs KHB + PEG (paired Student t-test). Differences were analyzed concerning peak pressure, delta of pulsatile pressure, and area under the pressure curve.