Journal
WORLD NEUROSURGERY
Volume 145, Issue -, Pages E38-E52Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.wneu.2020.09.012
Keywords
Hydrocephalus; Idiopathic normal pressure hydrocephalus; iNPH; Normal pressure hydrocephalus; NIS; NPH; Shunt
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This study summarized the national prevalence of iNPH, trends in its management over the previous decade, and variations in procedure utilization by region and hospital type in the United States.
BACKGROUND: Over the past 2 decades, management of idiopathic normal pressure hydrocephalus (iNPH) has evolved significantly. In the current study, we sought to evaluate the national prevalence and management trends of iNPH in the United States using a national database. METHODS: The National Inpatient Sample was queried for patients with an International Classification of Diseases diagnosis code for iNPH from 2007 to 2017. Trends in prevalence and procedure type were evaluated per 100,000 discharges and as a percentage of discharges, using weighted discharges. Utilization of procedure type across U.S. regions and hospital types was also compared. RESULTS: From 2007 to 2017, 302,460 weighted discharges with any diagnosis code for iNPH, aged >= 60 years, were identified. Prevalence ranged from 0.04% to 0.20% (41/100,000 to 202/100,000) among admitted patients >= 60 years old, giving an average prevalence during the study duration of 0.18% (179/100,000). Of 66,759 weighted discharges with a primary diagnosis code of iNPH undergoing surgical management, ventriculoperitoneal shunt (72.0% of discharges, n = 48,977) was most commonly used; of these, 9.3% (n = 4567) were performed laparoscopically. This result was followed by lumbar peritoneal shunt (15.1% of discharges, n = 10,441). Up to 15.1% (n = 9990) of discharges reported only a lumbar puncture, assumed to be only diagnostic, for screening, or part of serial cerebrospinal fluid removal procedures. Significant discrepancies in procedure utilization were also identified among hospitals in the Western, Southern, Northeast and Midwest regions, as well as between urban and rural hospitals (P < 0.05). CONCLUSIONS: We have summarized the national prevalence of iNPH, trends in its management over the previous decade and trends by region and hospital type.
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