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Effect of cough on AP. a AP changes during cough for patients 6 (left) and 11 (right) at low (open circles) and high (solid circles) SCPPs. Plots showing individual patient values (points) and means (lines) at high (HI) versus low (LO) SCPP of mean SCPP (b), mean maximum AP (c), and mean change in AP during cough (d). Color codes for patients 71–84. # #P < 0.0001. AP anal pressure, SCPP spinal cord perfusion pressure
