Abstract
The ever present need to balance over drainage with under drainage in hydrocephalus has required innovations including adjustable valves with antigravity devices. These are activated in the vertical position to prevent siphoning. We describe a group of patients who presented with unexplained under drainage caused by activation of antigravity shunt components produced by peculiar head/body position.
Highlights
The ever present need to balance over drainage with under drainage in hydrocephalus has required innovations including adjustable valves with antigravity devices
The combination of raised ICP when supine and a resistant shunt assistant could be blamed for worsening hydrocephalus
Antigravity devices should be placed at the chest
Summary
The ever present need to balance over drainage with under drainage in hydrocephalus has required innovations including adjustable valves with antigravity devices. These are activated in the vertical position to prevent siphoning. We describe a group of patients who presented with unexplained under drainage caused by activation of antigravity shunt components produced by peculiar head/body position
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