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FIG 4. A, Blood flow in SSS territory before tap test shows very similar arterial and venous flows with minimal delay.
B, Blood flow in SSS territory immediately after removal of 30 mL of CSF. Note the arterial curve now peaks earlier, is higher, and is thinner. The venous curve peaks later, is lower, and is wider.
C, Net blood flow before and after tap test. The divergence of the curves after intervention has led to a larger overall pulsation in systole (positive half of curve).
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