Abstract
Aims of study
It is reported that severe bladder disorder in idiopathic normal-pressure hydrocephalus (iNPH) is predicted by right frontal hypoperfusion. However, it is not known whether bladder recovery is predicted by brain perfusion change after shunt surgery. To address this issue, we compared bladder and brain function before and after shunt surgery in iNPH.
Methods
We enrolled 75 patients in the study. Before and 12 months after shunt surgery, we analyzed brain perfusion by SPECT and bladder disorder by a specialized grading scale. The scale consisted of grade 0, none; grade 1, urinary urgency and frequency; grade 2, urinary incontinence 1–3 times a week; grade 3, urinary incontinence >daily; and grade 4, loss of bladder control. More than one grade improvement is defined as improvement, and more than one grade decrement as worsening; otherwise no changes.
Results
Comparing before and after surgery, in the bladder-no-change group (32 cases) there was an increase in blood flow which is regarded as reversal of enlargement in the Sylvian fissure and lateral ventricles (served as control). In contrast, in the bladder-improved group (32 cases) there was an increase in bilateral mid-cingulate, parietal, and left frontal blood flow (p < 0.05). In the bladder-worsened group (11 cases) no significant blood flow change was observed.
Conclusion
The present study showed that after shunt surgery, bladder recovery is related with mid-cingulate perfusion increase in patients with iNPH. The underlying mechanism might be functional restoration of the mid-cingulate that normally inhibits the micturition reflex.
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Author contributions
Sakakibara R has a role in study concept and design, acquisition of subjects and/or data, analysis and interpretation of data, and preparation of manuscript; Uchida Y has a role in statistical analysis of the study; Ishii K has a role in: execution of the study; Kazui H has a role in: execution of the study; Hashimoto M has a role in execution of the study; Ishikawa M has a role in execution of the study; Yuasa T has a role in execution of the study; Yamamoto T has a role in execution of the study; Yamanishi T has a role in execution of the study; Uchiyama T has a role in execution of the study; Tateno F has a role in acquisition of data; Kishi M has a role in acquisition of data; Tsuyusaki Y has a role in acquisition of data; Aiba Y has a role in execution of the study; Nagao T has a role in execution of the study; Terada H has a role in execution of the study; All the members of SINPHONI have a role in acquisition of data.
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Sakakibara, R., Uchida, Y., Ishii, K. et al. Bladder recovery relates with increased mid-cingulate perfusion after shunt surgery in idiopathic normal-pressure hydrocephalus: a single-photon emission tomography study. Int Urol Nephrol 48, 169–174 (2016). https://doi.org/10.1007/s11255-015-1162-2
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DOI: https://doi.org/10.1007/s11255-015-1162-2