[[Idiopathic normal pressure hydrocephalus]], [[secondary chronic hydrocephalus]], and other [[cerebrospinal fluid]] (CSF) [[disorder]]s are often challenging to diagnose. Since [[shunt surgery]] is usually the only therapeutic option and carries significant [[morbidity]], optimal patient selection is crucial. The [[tap test]] is the most commonly used prognostic test to confirm the diagnosis but lacks [[sensitivity]]. The lumbar [[infusion test]] appears to be a better [[option]], offering additional information on brain [[dynamics]] without increasing [[morbidity]]. However, this technique remains underused. In a [[narrative review]], supported by the extensive experience of several European expert [[center]]s, Jannelli et al. detail the physiological basis, indications, and CSF [[dynamics]] parameters that can be measured. They also discuss technical modalities and variations, including one versus 2 needles, patient positioning, and the site of CSF measurement, as well as in vivo shunt testing. Finally, they discuss the [[limitation]]s and morbidity associated with the LIT. This review aims to assist teams wishing to incorporate LIT into their screening tools for chronic hydrocephalus and other CSF disorders
((Jannelli G, Calvanese F, Pirina A, Gergelé L, Vallet A, Palandri G, Czosnyka M, Czosnyka Z, Manet R. Assessment of CSF Dynamics Using Infusion Study: Tips and Tricks. World Neurosurg. 2024 Sep;189:33-41. doi: 10.1016/j.wneu.2024.05.131. Epub 2024 May 27. PMID: 38810871.))
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