Is there a connection between apathy and gait improvement in patients with Normal Pressure Hydrocephalus (NPH)? By: Aparna Srinivasan. Article published at web of Hydrocephalus Association: www.hydroassoc.org Idiopathic NPH (iNPH) is a disorder commonly seen in older adults. These adults have enlarged ventricles with a normal cerebrospinal fluid (CSF) pressure. The three common symptoms seen in adults with iNPH include: gait disorder (difficulty walking), inability to control urination, and behavioral disturbances.