Microvascular decompression

What is microvascular decompression?

Microvascular decompression (MVD) is a specialised neurosurgical procedure used to relieve abnormal pressure on cranial nerves caused by nearby blood vessels. This pressure can lead to severe, often debilitating facial pain or muscle spasms. Unlike treatments that damage or numb the nerve, MVD aims to correct the underlying cause while preserving normal nerve function.

Conditions treated with microvascular decompression

MVD is most commonly performed to treat trigeminal neuralgia, a condition characterised by sudden, intense facial pain. It is also used for hemifacial spasm, which causes involuntary facial muscle contractions, and less frequently for glossopharyngeal neuralgia, a rare disorder causing throat and ear pain. Patients are typically considered for MVD when medications fail to provide adequate relief or cause unacceptable side effects.

How the procedure works

The surgery is performed under general anesthesia by a neurosurgeon. A small opening is made in the skull behind the ear to access the affected cranial nerve. Using a microscope, the surgeon identifies the blood vessel compressing the nerve and gently moves it away. A small cushion, often made of Teflon, is placed between the nerve and the vessel to prevent future contact. The goal is to eliminate the pressure without damaging the nerve.

Benefits of microvascular decompression

One of the major advantages of MVD is that it treats the root cause of nerve irritation rather than masking symptoms. Many patients experience immediate and long-lasting relief from pain or spasms. Because the nerve is preserved, normal sensation and function are usually maintained, making MVD an attractive option for suitable candidates.

Risks and considerations

As with any brain surgery, MVD carries risks, including infection, bleeding, hearing loss, facial weakness, or stroke, though serious complications are relatively uncommon when performed by experienced surgeons. Careful patient selection and thorough preoperative evaluation are essential to minimise risks.

The risk of injury to delicate structures such as the nerves which control hearing, facial movement and coordination of swallow is minimised by monitoring their function throughout surgery using Intraoperative Neurological Monitoring (IONM).

Recovery and outlook

Most patients remain in the hospital for several days after surgery and gradually return to normal activities within a few weeks. Long-term success rates are high, particularly for trigeminal neuralgia. With proper follow-up care, many individuals enjoy significant improvement in quality of life.

Conclusion

Microvascular decompression is a highly effective surgical option for certain nerve compression disorders. By addressing the underlying vascular cause, it offers lasting relief while preserving nerve function, making it a valuable treatment for carefully selected patients.