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Real-time Noninvasive Monitoring of Intracranial Fluid Shifts During Dialysis Using Volumetric Integral Phase-Shift Spectroscopy (VIPS): A Proof-of-Concept Study

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Abstract

Background

Cerebral edema, which is associated with increased intracranial fluid, is often a complication of many acute neurological conditions. There is currently no accepted method for real-time monitoring of intracranial fluid volume at the bedside. We evaluated a novel noninvasive technique called “Volumetric Integral Phase-shift Spectroscopy (VIPS)” for detecting intracranial fluid shifts during hemodialysis.

Methods

Subjects receiving scheduled hemodialysis for end-stage renal disease and without a history of major neurological conditions were enrolled. VIPS monitoring was performed during hemodialysis. Serum osmolarity, electrolytes, and cognitive function with mini-mental state examination (MMSE) were assessed.

Results

Twenty-one monitoring sessions from 14 subjects (4 women), mean group age 50 (SD 12.6), were analyzed. The serum osmolarity decreased by a mean of 6.4 mOsm/L (SD 6.6) from pre- to post-dialysis and correlated with an increase in the VIPS edema index (E-Dex) of 9.7% (SD 12.9) (Pearson’s correlation r = 0.46, p = 0.037). Of the individual determinants of serum osmolarity, changes in serum sodium level correlated best with the VIPS edema index (Pearson’s correlation, r = 0.46, p = 0.034). MMSE scores did not change from pre- to post-dialysis.

Conclusions

We detected an increase in the VIPS edema index during hemodialysis that correlated with decreased serum osmolarity, mainly reflected by changes in serum sodium suggesting shifts in intracranial fluids.

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Acknowledgements

Dr. Venkatasubba Rao received funding from Cerebrotech Medical Systems for this investigator initiated study.

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Correspondence to Chethan P. Venkatasubba Rao.

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Supplement Fig. 1a

Cerebrotech Monitoring System: CMS 4000. Version lacking the external connecting cables (JPEG 484 kb)

Supplement Fig. 1b

Cerenbrotech Monitoring System: CMS 5000. Improvised system with advanced head frame (JPEG 2453 kb)

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Venkatasubba Rao, C.P., Bershad, E.M., Calvillo, E. et al. Real-time Noninvasive Monitoring of Intracranial Fluid Shifts During Dialysis Using Volumetric Integral Phase-Shift Spectroscopy (VIPS): A Proof-of-Concept Study. Neurocrit Care 28, 117–126 (2018). https://doi.org/10.1007/s12028-017-0409-4

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