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Things worth knowing about "Coiling"
Coiling is a minimally invasive neurosurgical procedure used to treat brain aneurysms by inserting platinum coils into the aneurysm sac to prevent rupture.
What is Coiling?
Coiling (also known as endovascular coil embolization) is a minimally invasive neurosurgical procedure used to treat intracranial aneurysms -- abnormal bulges in brain arteries that can rupture and cause life-threatening bleeding. During the procedure, tiny platinum coils are inserted into the aneurysm sac to block blood flow into it and prevent rupture.
When is Coiling Used?
Coiling is primarily used in the following situations:
- Intracranial aneurysms: Bulges in brain blood vessels that carry a risk of subarachnoid hemorrhage.
- Subarachnoid hemorrhage (SAH): Emergency treatment after an aneurysm has already ruptured.
- Preventive treatment: For incidentally discovered, unruptured aneurysms that are considered high-risk due to their size or shape.
The choice between coiling and the alternative open surgery (surgical clipping) depends on the location, shape, and size of the aneurysm, as well as the overall health of the patient.
How Does the Coiling Procedure Work?
Coiling is performed in a specialized neurosurgical or neuroradiological center under general anesthesia with continuous imaging guidance:
- A thin catheter (tube) is inserted through an artery, usually in the groin, and guided to the blood vessels of the brain.
- Using X-ray contrast dye and digital subtraction angiography (DSA), the aneurysm is precisely located.
- Tiny platinum coils are delivered through the catheter into the aneurysm sac.
- The coils fill the sac and promote the formation of a blood clot (thrombosis) inside the aneurysm.
- The aneurysm is isolated from normal blood flow and gradually shrinks over time.
Advantages and Risks
Advantages
- Minimally invasive: no open brain surgery required
- Shorter hospital stay compared to surgical clipping
- Lower risk of infection
- Suitable for elderly patients or those with significant health conditions
Risks and Possible Complications
- Aneurysm rupture during the procedure (rare)
- Stroke caused by blood clots or vessel occlusion
- Rebleeding or recanalization (reopening of the aneurysm to blood flow)
- Allergic reaction to the contrast dye
- Radiation exposure from X-ray imaging
Follow-Up and Long-Term Monitoring
After coiling, regular follow-up examinations are essential, as a treated aneurysm can in rare cases regrow or reopen. Typical follow-up includes:
- MR angiography or repeat DSA at 6 months, 1 year, and then annually
- Adjustment of blood pressure medications and anticoagulants as needed
References
- Molyneux AJ et al. - International Subarachnoid Aneurysm Trial (ISAT): a randomised trial of neurosurgical clipping versus endovascular coiling in 2143 patients with ruptured intracranial aneurysms. The Lancet, 2002.
- Rinkel GJ, Djibuti M, Algra A, van Gijn J. - Prevalence and risk of rupture of intracranial aneurysms: a systematic review. Stroke, 1998.
- Brisman JL, Song JK, Newell DW. - Cerebral Aneurysms. New England Journal of Medicine, 2006.
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