RT info:eu-repo/semantics/doctoralThesis T1 Estudio de la volumetría ventricular y de los polimorfismos del colágeno XVIII y acuaporina 4 y su relación con la hidrocefalia normotensiva idiopática A1 Jiménez Zapata, Herbert Daniel A2 Universidad de Valladolid. Escuela de Doctorado K1 Medicina Interna K1 Normal pressure hydrocephalus K1 Hidrocefalia normotensiva K1 Cerebrospinal fluid K1 Líquido cefalorraquídeo K1 Polymorphism K1 Polimorfismos K1 Ventricle volumetry K1 Volumetría ventricular K1 32 Ciencias Médicas AB Idiopathic normal pressure hydrocephalus is a clinical condition characterized by neurological symptoms associated with ventriculomegaly and normal intracranial pressure.It is one of the most common pathologies in neurosurgery, with a prevalence of 8.9% in patients over 80 years being one of the main causes of reversible neurological deterioration in the elderly.Its pathophysiology is not entirely clear, and new theories have emerged in the last decade, including impaired cerebral compliance, loss of pulsatility, and slowing of the glymphatic system. Within these theories, various blood-brain barrier proteins, such as aquaporin 4 and collagen XVIII, have gained significant importance.Currently, there are no diagnostic tests that allow us to accurately determine which patients with suspected idiopathic normal pressure hydrocephalus will benefit from CSF shunt placement. For that reason, nowadays selecting surgical candidates is a laborious and inexact process.In this thesis, we studied the relationship between ventricular size and postoperative outcome, observing that patients with normal pressure hydrocephalus who have smaller ventricles are more likely to improve. At the same time, we studied various polymorphisms of collagen XVIII and aquaporin 4, without observing differences between responders and non-responders. YR 2025 FD 2025 LK https://uvadoc.uva.es/handle/10324/77838 UL https://uvadoc.uva.es/handle/10324/77838 LA spa NO Escuela de Doctorado DS UVaDOC RD 11-oct-2025