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. Author manuscript; available in PMC: 2020 Nov 26.
Published in final edited form as: Curr Neurol Neurosci Rep. 2019 Nov 26;19(12):94. doi: 10.1007/s11910-019-1009-9

Fig. 1.

Fig. 1

Number of predefined wean attempts alone can determine rate of ventriculoperitoneal shunt (VPS) placement between rapid and gradual wean groups. The figure defines a hypothetical scenario where a rapid or gradual wean is started on day 5 following EVD placement. Only 2 wean failures are tolerated prior to placing a VPS. The rapid wean consists of immediate clamping of the EVD. The gradual wean consists of stepwise raising of the EVD that culminates in a clamp trial. A 24-h period is used to determine success or failure of wean. The scenario assumes in both cases that the EVD could be successfully discontinued on or after day 10, unbeknownst to the clinician.