{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T09:06:05Z","timestamp":1762160765833},"reference-count":55,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1986,1]]},"abstract":"<jats:p content-type=\"fine-print\">\u2713 Twenty-nine patients consecutively admitted with a diagnosis of communicating hydrocephalus underwent 1) continuous intracranial pressure (ICP) monitoring; 2) pressure-volume studies; and 3) measurement of resistance to outflow of cerebrospinal fluid (R<jats:sub>out<\/jats:sub>). The two latter calculations were made by the bolus injection and pressure-volume index (PVI) techniques. In 19 patients mean ICP never exceeded 15 mm Hg. In the other 10 patients varying degrees of mildly raised ICP was noted. The frequency of waves at \u00bd to 2\/min varied from 3% to 58%. The ICP pulse amplitude ranged from 0.5 to 10 mm Hg, and PVI from 4.6 to 18.2 ml. The R<jats:sub>out<\/jats:sub> ranged from 2.5 to 31.4 mm Hg\/ml\/min, and was linearly correlated to the ICP. Thus, patients with a higher R<jats:sub>out<\/jats:sub> also had a higher ICP as compared with patients with lower R<jats:sub>out<\/jats:sub>, yet ICP could still be within limits considered normal. The cerebrospinal fluid dynamics (formation rate \u00d7 resistance) contributed much more to the ICP than in normal individuals. It is postulated that communicating hydrocephalus represents one endpoint of a continuum, where the preceding phase is high-pressure and high-resistance hydrocephalus as, for instance, is seen after subarachnoid hemorrhage. In some patients, there is a possibility of cerebral atrophy accompanied by otherwise insignificant increased R<jats:sub>out<\/jats:sub>. In this study, the PVI technique proved to be a fast and safe method of measuring R<jats:sub>out<\/jats:sub>.<\/jats:p>","DOI":"10.3171\/jns.1986.64.1.0045","type":"journal-article","created":{"date-parts":[[2009,5,8]],"date-time":"2009-05-08T16:23:27Z","timestamp":1241799807000},"page":"45-52","source":"Crossref","is-referenced-by-count":35,"title":["CSF dynamics and pressure-volume relationships in communicating hydrocephalus"],"prefix":"10.3171","volume":"64","author":[{"given":"Michael","family":"Kosteljanetz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1","series-title":"J Neurosurg","doi-asserted-by":"publisher","first-page":"252","DOI":"10.3171\/jns.1984.60.2.0252","article-title":"Effects of halothane and fentanyl anesthesia on resistance to reabsorption of CSF.","volume":"60","author":"Artru","year":"1984"},{"key":"b2","series-title":"Acta Neurochir","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1007\/BF01405737","article-title":"Surgical indications in normotensive hydrocephalus. 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