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Fig. 6 | Intensive Care Medicine Experimental

Fig. 6

From: Hydrocephalus and the neuro-intensivist: CSF hydrodynamics at the bedside

Fig. 6

Example of a constant rate infusion test in a patient with craniectomy and brain atrophy. In this post-craniectomy, post-SAH patient, baseline and plateau pressures during infusion test (gray area) are normal (5.33 and 15.45 mmHg, respectively). Resistance R to CSF outflow is low (7.61 mmHg × ml−1 × min−1) but there are some B waves in the tracings of both ICP and AMP (pulse amplitude). Nevertheless, their energy and duration are lower in relation with cases of disturbed CSF circulation. This patient does not need any shunt. RAP index is close to + 1 during infusion test, signifying poor pressure–volume reserve

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