Cerebral Ischemia: Stop the Risk of Chronic Cerebral Ischemia with Cerebral Revascularization Surgery

Stroke: Causes of Disability and Death

Stroke is considered one of the major causes of permanent disability and death, especially among middle-aged and elderly groups. However, this disease is not limited to the elderly only, as certain cerebrovascular abnormalities can be found from childhood, such as Moyamoya disease, which is a condition where the cerebral arteries gradually narrow or become blocked, usually occurring at the base of the brain. This results in insufficient blood supply to the brain and may lead to chronic cerebral ischemia or unexpected acute stroke symptoms.

 

In cases where medication, such as antiplatelet drugs, cannot effectively control symptoms or prevent recurrence, advanced surgical technology called “Cerebral Revascularization” becomes important in treatment.

 

What is Cerebral Revascularization and Why is Brain Blood Vessel Surgery Needed?

Cerebral Revascularization is a surgery to create new blood flow pathways to the brain (Revascularization Surgery) to prevent acute cerebral ischemia and reduce the risk of severe complications in patients with cerebral blood flow problems. It is divided into two main approaches:

     ๐  Flow Augmentation

This is used in cases where patients have chronic cerebral artery stenosis or occlusion, such as Moyamoya disease, which can be found from childhood to adulthood. It usually occurs in the large arteries at the base of the brain, such as the Internal Carotid Artery (ICA), which gradually narrows, causing the brain to form small collateral vessels to compensate. Although these collateral vessels help offset reduced blood flow, it is still insufficient, so patients may experience temporary limb weakness, paralysis, seizures, chronic headaches, memory loss, or cognitive problems.

     ๐  Flow Preservation

This is used to prevent damage or rupture of cerebral blood vessels, such as in patients with dissecting aneurysms caused by tears in the inner vessel wall, or fusiform aneurysms characterized by circumferential dilation of the vessel wall. It is also used in cases requiring brain tumor surgery near or involving large cerebral arteries. Blood vessel bypass surgery helps protect the vessels during or after surgery.

 

Diseases and Conditions That May Require Cerebral Revascularization Surgery

Cerebral Revascularization surgery is usually performed in cases of chronic cerebral artery stenosis or complex cerebrovascular diseases that result in insufficient blood supply to the brain, such as:

     ๐  Moyamoya Disease This disease is caused by progressive narrowing of the large arteries at the base of the brain, leading to the formation of collateral vessels. Surgery helps create bypass routes to improve blood flow to the brain.

     ๐  Complex Chronic Cerebral Artery Stenosis In cases of severe artery stenosis or occlusion that do not respond to standard treatments such as antiplatelet drugs or endovascular dilation, patients continue to experience ischemic symptoms. Cerebral artery bypass surgery helps increase blood flow to the affected areas.

     ๐  Certain Abnormal Cerebrovascular Conditions Causing Brain Ischemia Such as congenital or acquired cerebrovascular abnormalities that lead to chronic cerebral ischemia over the long term.

 

It should be noted that cerebral artery bypass surgery differs from the treatment of ‘Acute Ischemic Stroke,’ which is usually treated with thrombolytic drugs or urgent endovascular procedures to open blocked vessels. Cerebral artery bypass surgery focuses on creating bypass routes or stimulating new vessel growth.

 

Technology and Treatment Process of Cerebral Revascularization

There are three main methods of cerebral artery bypass surgery. The choice depends on the disease characteristics, size and location of the vessels, overall patient health, and neurological symptoms, as follows:

     ๐  Direct Bypass Surgery This surgery connects an external artery directly to a cerebral artery, such as STA-MCA Bypass surgery, which allows immediate and effective blood flow from the new vessel to the brain. It is suitable for patients with sufficiently large vessels, especially adults, and those needing urgent increased blood flow to the brain, such as those with limb weakness, seizures, or speech difficulties due to cerebral ischemia.

     ๐  Indirect Bypass Surgery This method stimulates new blood vessel growth by opening the skull and placing tissue with small blood vessels, such as dura mater, temporalis muscle, or periosteum, onto the ischemic brain surface to encourage new vessel growth into the brain gradually. This technique is often chosen for children or patients with small cerebral vessels unsuitable for direct bypass.

     ๐  Combined Method This surgery combines both direct bypass and placement of vascularized tissue to stimulate new vessel growth in the same patient. This approach increases the chances of restoring cerebral blood flow in both the short and long term. Direct bypass provides immediate blood flow, while indirect surgery supports future vessel growth. It is suitable for patients with multi-level vascular abnormalities or complex risk factors.

 

Recovery and Postoperative Care After Cerebral Artery Surgery

After cerebral artery bypass surgery, patients will receive close monitoring as follows:

     ๐  Recovery in the Intensive Care Unit (ICU) for about 1-3 days to closely monitor vital signs and neurological status.

     ๐  Recovery in a general ward for about 5-7 days until symptoms stabilize and the patient is ready to be discharged.

     ๐  During hospitalization, doctors will closely monitor symptoms and may perform repeat MRI or MRA to evaluate surgical outcomes.

     ๐  After discharge, avoid heavy activities or strenuous exertion for at least 1-2 months to allow the new vessels to heal and the circulatory system to adjust properly.

 

The first 3-6 months after surgery is considered the ‘Golden Period,’ when the brain has the highest capacity for recovery. During this time, the following should be observed:

     ๐  Regular physical therapy to restore movement, strength, and balance.

     ๐  Speech therapy or occupational therapy if there are communication, memory, or daily living skill impairments.

     ๐  Strictly follow the advice of doctors and care teams to increase the chances of returning to normal daily life and reduce the risk of complications or recurrence.

 

Cerebral Revascularization surgery is an effective treatment option for patients with chronic cerebral artery stenosis. At Phyathai Phaholyothin Hospital, we have an experienced neurosurgical team specializing in stroke treatment, equipped with advanced medical technology. We provide comprehensive care from diagnosis, treatment planning, surgery, to postoperative rehabilitation to ensure patients receive holistic care, which helps restore damaged brain tissue, reduce complications, and promote quality of life.

 

Source : Phyathai Phaholyothin Hospital