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Clipping: Neurosurgical Treatment of Brain Aneurysms

Clipping is a neurosurgical procedure in which a small metal clip is placed at the base of a brain aneurysm to prevent or stop bleeding.

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Things worth knowing about "Clipping"

Clipping is a neurosurgical procedure in which a small metal clip is placed at the base of a brain aneurysm to prevent or stop bleeding.

What is Clipping?

Clipping is a neurosurgical procedure primarily used to treat brain (cerebral) aneurysms. A small metal clip, typically made of titanium or another biocompatible alloy, is applied to the neck (base) of an aneurysm to cut off blood flow into the abnormally enlarged section of the vessel. It is one of the oldest and most well-established techniques in vascular neurosurgery.

Indications

The clipping procedure is used in the following clinical situations:

Unruptured brain aneurysms: As a preventive measure to avoid a potential rupture and life-threatening subarachnoid hemorrhage.
Ruptured brain aneurysms: As an emergency procedure following subarachnoid hemorrhage to prevent re-bleeding.
Arteriovenous malformations (AVM): In selected cases as part of a combined treatment approach.

How the Procedure is Performed

The procedure is performed under general anesthesia and requires a craniotomy – the surgical opening of the skull. Using an operating microscope, the neurosurgeon gains access to the affected cerebral artery and precisely positions the clip at the neck of the aneurysm. Closing the clip permanently blocks blood from entering the aneurysm while preserving normal blood flow in the parent artery.

Key Steps of the Procedure

Preoperative imaging (MRI, CT angiography) for surgical planning
Craniotomy to open the skull
Microsurgical dissection and exposure of the aneurysm
Precise placement of the titanium clip at the aneurysm neck
Intraoperative angiography to confirm successful occlusion
Closure of the craniotomy

Clipping vs. Coiling

An alternative, minimally invasive procedure is endovascular coiling, in which soft platinum coils are delivered via a catheter into the aneurysm to fill and seal it from the inside. The choice between clipping and coiling depends on several factors:

Location, size, and shape of the aneurysm
General health and age of the patient
Expertise of the treating center
Urgency of the situation (ruptured vs. unruptured)

Studies such as the ISAT trial have shown that coiling may offer superior short-term outcomes for certain aneurysms, while clipping often provides greater long-term durability and lower rates of recurrence.

Risks and Complications

Like any neurosurgical operation, clipping carries specific risks:

Bleeding during or after the procedure
Ischemia due to accidental occlusion of adjacent vessels
Infection or wound healing complications
Neurological deficits depending on the area of the brain operated on
Clip migration or incomplete occlusion of the aneurysm

Aftercare and Prognosis

After a clipping procedure, patients are typically monitored in a neurosurgical intensive care unit. Follow-up care includes regular imaging checks (e.g., MRI or CT angiography) to verify correct clip positioning and permanent closure of the aneurysm. The prognosis depends heavily on the initial clinical situation: elective procedures for unruptured aneurysms generally carry a more favorable outlook than emergency surgery following rupture.

References

Molyneux A. et al. - International Subarachnoid Aneurysm Trial (ISAT). The Lancet, 2002; 360(9342): 1267-1274.
Greenberg M.S. - Handbook of Neurosurgery, 9th Edition. Thieme Medical Publishers, 2019.
Lawton M.T. - Seven Aneurysms: Tenets and Techniques for Clipping. Thieme Medical Publishers, 2011.

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