Ventriculitis

Ventriculitis is inflammation of the ependymal lining of the cerebral ventricles and of the cerebrospinal fluid they contain. In neurosurgical practice it is most often encountered as a healthcare-associated infection related to external ventricular drains and cerebrospinal fluid shunts, where it overlaps closely with healthcare-associated meningitis.

Definition

Ventriculitis is inflammation, usually infective, of the ependymal lining of the cerebral ventricles and the ventricular cerebrospinal fluid, frequently associated with external ventricular drainage, cerebrospinal fluid shunts, and other neurosurgical procedures.

Scope

This entry describes ventriculitis as infection of the ventricular system: the structures it involves, its strong association with cerebrospinal fluid devices, how it relates to meningitis, and the difficulty of diagnosing it in patients with drains in place. It is a reference description and does not provide antimicrobial or device-management protocols.

Core questions

• What structures define ventriculitis and how does it relate to meningitis?
• Why is ventriculitis so closely linked to external ventricular drains and cerebrospinal fluid shunts?
• Why is the diagnosis of device-associated ventriculitis difficult in patients with indwelling drains?
• How is healthcare-associated ventriculitis grouped with meningitis in current classifications?

Key concepts

• Inflammation of the ependymal ventricular lining
• Healthcare-associated (device-related) central nervous system infection
• External ventricular drain and shunt as portals of infection
• Overlap with healthcare-associated meningitis
• Cerebrospinal fluid sampling from ventricular devices
• Diagnostic uncertainty with indwelling drains

Mechanisms

Ventriculitis arises when organisms gain access to the ventricular cerebrospinal fluid and ependyma, most often along the track of an external ventricular drain or a cerebrospinal fluid shunt, at the time of insertion or during subsequent manipulation and sampling; it may also follow rupture of a deep abscess into the ventricle or extension of meningitis. The inflammatory response within the ventricular system alters the cerebrospinal fluid and can impair its circulation and absorption, contributing to hydrocephalus. Because patients with drains often have abnormal baseline cerebrospinal fluid and overlapping clinical signs, distinguishing infection from non-infective changes is a recognised diagnostic challenge, and current guidance groups ventriculitis with healthcare-associated meningitis.

Clinical relevance

Ventriculitis is central to neurosurgical infection practice because it is one of the principal device-associated complications of cerebrospinal fluid drainage and shunting, and because it can both result from and contribute to disturbed cerebrospinal fluid circulation. Understanding its association with devices and its overlap with meningitis supports critical appraisal of the evidence and guidelines. This entry describes the entity and is not a basis for individual diagnostic or treatment decisions.

Epidemiology

Healthcare-associated ventriculitis is recognised as an important complication of external ventricular drainage and cerebrospinal fluid shunting, and it is addressed together with healthcare-associated meningitis in dedicated guidelines. Its reported frequency varies with the type and duration of cerebrospinal fluid device and with infection-prevention practices.

Seminal works

• tunkel-2017

Frequently asked questions

How is ventriculitis related to meningitis?

Both are inflammatory infections of central-nervous-system surfaces and cerebrospinal fluid; ventriculitis involves the ependymal lining of the ventricles, and current guidelines group healthcare-associated ventriculitis together with healthcare-associated meningitis because they overlap clinically.

Why is ventriculitis often a healthcare-associated infection?

It is most often linked to cerebrospinal fluid devices such as external ventricular drains and shunts, which provide a route for organisms to reach the ventricular cerebrospinal fluid.