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. 2019 Dec 12;162(5):1001–1009. doi: 10.1007/s00701-019-04095-w

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© The Author(s) 2019

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Fig. 4 — Example of the linear regression analysis between CSFp (ICP in the figure) and SSp (venous in the figure) for 1 out of the 9 studied patients. The slope and the intercept of the regression for each patient were averaged and were used to express SSp as SSp = a × CSFp + b, a = slope and b = intercept. SSp, expressed this way, can be used in Davson’s equation to simplify the calculations of its parameters in IIH patients. Notice that below CSFp 10 mmHg, SSp stopped to decrease further, while CSFp was easily drawn down by further drainage (JVP was 8 mmHg in this patient, CVP was ~ 11 mmHg)