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Cerebral Small Vessel Disease: What to Know & What to Do

Signs of cerebral small vessel disease. From Inzitari et al, BMJ. 2009 Jul 6;339:b2477. doi: 10.1136/bmj.b2477

This article is about the most common aging brain problem that you may have never heard of.

While leading a fall prevention workshop a few years ago, I mentioned that an older person’s walking and balance problems might well be related to the presence of “small vessel ischemic changes” in the brain, which are very common in aging adults. (This is also called “white matter disease.”)

This led to an immediate flurry of follow-up questions. What exactly are these changes, people wanted to know. Do they happen to every older adult? Is this the same as vascular dementia? And how they can best help their parents with cognitive decline?

Well, these types of brain lesions don’t happen to every older person, but they do happen to the vast majority of them.  In fact, one study of older adults aged 60-90 found that 95% of them showed signs of these changes on brain MRI.

In other words, if your older parent ever gets an MRI of the head, he or she will probably show some signs of these changes.

So this is a condition that older adults and families should know about. Furthermore, these changes have been associated with problems of consequence to older adults, including:

Now, perhaps the best technical term for what I’m referring to is “cerebral small vessel disease.” But many other synonyms are used by the medical community — especially in radiology reports. They include:

In this post, I will explain what all older adults and their families should know about this extremely common condition related to the brain health of older adults.

In particular, I’ll address the following frequently asked questions:

I will also address what you can do, if you are concerned about cerebral SVD for yourself or an older loved one.

What is cerebral small vessel disease?

Cerebral small vessel disease (SVD) is an umbrella term covering a variety of abnormalities related to small blood vessels in the brain. Because most brain tissue appears white on MRIs, these abnormalities were historically referred to as “white matter changes” or “white matter disease.”

Per this medical review article, specific examples of cerebral SVD include “lacunar infarcts” (which are a type of small stroke), “white matter hyperintensities” (which are a radiological finding), and “cerebral microbleeds” (which means bleeding in the brain from a very small blood vessel).

In many cases, cerebral SVD seems to be a consequence of atherosclerosis affecting the smaller blood vessels that nourish brain tissue. Just as one’s larger blood vessels in the heart or elsewhere can accumulate plaque, inflammation, and chronic damage over the years, so can the smaller blood vessels.

Such chronic damage can lead the small blood vessels in the brain to become blocked (which starves brain cells of oxygen, and which we technically call ischemia), or to leak (which causes bleeding, which we call hemorrhage and can damage nearby brain cells).

When little bits of brain get damaged in these ways, they can change appearance on radiological scans. So when an MRI report says “white matter disease,” this means the radiologist is seeing signs that probably indicate cerebral SVD.

(Note: In this podcast episode, a UCSF brain health expert explains that although cerebral small vessel disease is probably the most common cause of white matter changes in older adults, it’s not the only condition that can cause such changes. )

Such signs of SVD may be described as “mild”, “moderate,” or “severe/extensive,” depending on how widespread they are.

Here is an enlargement of a good image, from the BMJ article “Changes in white matter as determinant of global functional decline in older independent outpatients.”

MRI brain cerebral small vessel ischemic disease
From Inzitari et al, BMJ. 2009 Jul 6;339:b2477. doi: 10.1136/bmj.b2477.

What are the symptoms of cerebral small vessel disease?

The severity of symptoms tends to correspond to whether radiological imaging shows the white matter changes to be mild, moderate, or severe.

Many older adults with cerebral SVD will have no noticeable symptoms. This is sometimes called “silent” SVD.

But many problems have been associated with cerebral SVD, especially when it is moderate or severe. These include:

So what does this all mean, in terms of symptoms and cerebral SVD? Here’s how I would boil it down:

1.Overall, older adults with any of the problems listed above have a high probability of having cerebral SVD.

2. But, many older adults with cerebral SVD on MRI are asymptomatic, and do not notice any difficulties. This is especially true of aging adults with mild cerebral SVD.

3. Older adults with cerebral SVD are at increased risk of developing the problems above, often within a few years time. This is especially true of people with moderate or severe cerebral SVD.

How is cerebral small vessel disease related to vascular dementia and cerebrovascular accidents?

The term “vascular dementia” means having dementia that is mostly due to having had problems with the blood vessels in the brain.

(For more on the definition of dementia and vascular dementia, see here: Beyond Alzheimer’s: Common Types of Dementia in Aging.)

The brain has some large blood vessels; when a person develops a clot or bleed related to a large blood vessel, this causes a major stroke, also known as a cerebrovascular accident.

It is possible to get dementia after a major stroke. However, in older adults, it’s probably more common to develop vascular dementia due to injuries to the small vessels of the brain. But again, as I explained above: not everyone with signs of cerebral small vessel disease ends up developing cognitive impairment or dementia.

What causes cerebral small vessel disease?

This is a topic of intense research, and the experts in this area tend to really nerd out when discussing it. (Read the scholarly papers listed below to see what I mean.) One reason it’s difficult to give an exact answer is that cerebral SVD is a broad umbrella term that encompasses many different types of problems with the brain’s small blood vessels.

Still, certain risk factors for developing cerebral SVD have been identified. Many overlap with risk factors for stroke. They include:

There is also evidence that Alzheimer’s disease and cerebral small vessel disease frequently co-exist in older adults, and might interact to accelerate cognitive decline.

How can cerebral small vessel disease be treated or prevented?

Experts are still trying to figure out the answers to this question, and research into the prevention of cerebral SVD is ongoing.

Since worsening of white matter disease is often associated with clinical problems, experts are also trying to determine how we might prevent, or delay, the progression of SVD in older adults.

Generally, experts recommend that clinicians consider treating any underlying risk factors. In most cases, this means detecting and treating any traditional risk factors for stroke.

(For more on identifying and addressing stroke risk factors, see How to Address Cardiovascular Risk Factors for Better Brain Health: 12 Risks to Know & 5 Things to Do.)

To date, studies of hypertension treatment to prevent the progression of white matter changes have shown mixed results. It appears that treating high blood pressure can slow the progression of brain changes in some people. But such treatment may be less effective in people who are older than 80, or who already have severe cerebral SVD.

In other words, your best bet for preventing or slowing down cerebral SVD may be to properly treat high blood pressure and other risk factors before you are 80, or otherwise have significant SVD.

Furthermore, experts don’t yet agree on how low to go, when it comes to optimal blood pressure for an older person with cerebral small vessel disease. (This article explains why this has been difficult to determine.)

For now, to prevent the occurrence or progression of cerebral small vessel disease, it’s reasonable to start by observing the hypertension guidelines considered reasonable for most older adults: treat to a target of systolic blood pressure less than 150mm/Hg.

Whether to treat high blood pressure — and other cardiovascular risk factors — more aggressively should depend on an older person’s particular health circumstances. I explain a step-by-step process you can use (with links to related research) here: 6 Steps to Better High Blood Pressure Treatment for Older Adults.

You can also learn more about the research on CSVD and the effect of treating blood pressure here: The relation between antihypertensive treatment and progression of cerebral small vessel disease.

Should you request an MRI if you’re concerned about cerebral SVD?

Not necessarily. In my opinion, older adults should only get MRIs of the brain if the following two things are true:

  1. They are experiencing worrisome clinical symptoms, and
  2. The results of the MRI are needed to decide on how to treat the person.

For most older adults, an MRI showing signs of cerebral SVD will not, in of itself, change the management of medical problems.

If you have high blood pressure, you should consider treatment. If you are having difficulties with walking or balance, signs of cerebral SVD do not rule out the possibility of other common causes of walking problems, such as medication side-effects, foot pain, neuropathy, and so forth.

What if you’re concerned about memory or thinking problems? Well, you probably will find signs of cerebral SVD on an MRI, just because this is a common finding in all older adults, and it’s especially common in people who are experiencing cognitive changes.

However, the MRI cannot tell you whether the cognitive changes you are noticing are only due to cerebral SVD, versus due to developing Alzheimer’s disease, versus due one of the many other dementia mimics. You will still need to pursue a careful evaluation for cognitive impairment. And no matter what the MRI shows, you will likely need to consider optimizing cardiovascular risk factors.

So in most cases, a brain MRI just to check for cerebral SVD is probably not a good idea.

However, if an MRI is indicated for other reasons, you may find out that an older person has mild, moderate, or severe signs of cerebral SVD. In this case, especially if the cerebral SVD is moderate or severe, you’ll want to consider taking steps to reduce stroke risk, and also to monitor for cognitive changes and increased disability.

What to do if you’re worried about cerebral small vessel disease

If you are worried about cerebral SVD, for yourself or for an older relative, here a few things you can do:

If you want to learn still more about cerebral small vessel disease, here are some scholarly articles on the subject:

I also recommend listening to this very informative podcast interview, with Dr. Fanny Elahi of the UCSF Memory and Aging Center: 084 – Interview: Understanding White Matter Changes in the Aging Brain.

Note: We’ve hit 300+ comments on this article! So we’re closing comments for this article. Thank you for your interest!

Note: This article has generated a lot of questions from people under age 60. If that describes you, please read below:


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