Heart Health
What Does an Echocardiogram Actually Show? A Plain-Language Guide
Stroke is the fifth leading cause of death in the United States and the leading cause of long-term disability. The most frightening aspect is how suddenly it strikes — without warning, in people who felt completely healthy moments before. What most people don't know is that the risk can be detected and often dramatically reduced.
The vast majority of strokes — about 87% — are ischemic strokes, meaning they are caused by a blockage that cuts off blood flow to part of the brain. The most common mechanism involves the carotid arteries — the two large blood vessels running up each side of your neck that supply blood to the brain.
Over years, plaque — a mixture of cholesterol, calcium, and other substances — gradually builds up inside the carotid artery walls. This process is called atherosclerosis and it is almost entirely silent. The artery narrows progressively, but most people feel nothing. Then one of two things can happen: the artery narrows enough to severely restrict blood flow to the brain, or a piece of plaque breaks off and travels to the brain as an embolus, blocking a smaller vessel. Either way, a portion of the brain is deprived of oxygen and begins to die within minutes.
A carotid doppler ultrasound is the most effective non-invasive way to evaluate your carotid arteries. The scan shows the actual structure of the artery wall — allowing us to measure plaque burden, determine the degree of stenosis (narrowing), and characterize the type of plaque present.
Why does plaque characterization matter? Because not all plaque is equally dangerous. Soft, unstable plaque is more likely to rupture and embolize to the brain than hard, calcified plaque. An ultrasound can differentiate between the two, helping the cardiologist assess your near-term stroke risk more accurately.
We also measure intima-media thickness — the thickness of the artery wall itself. Increased thickness is an early marker of atherosclerosis that predates visible plaque formation, giving us a way to identify elevated risk even before significant plaque develops.
Carotid artery disease is more common than most people realize, and several factors dramatically increase your risk. Age over 55, particularly in men, is one of the strongest predictors. Smoking — even decades-old smoking history — leaves permanent damage to artery walls. High blood pressure chronically injures vessel walls, accelerating plaque formation. High cholesterol provides the raw material for plaque buildup. Diabetes affects blood vessel health throughout the body. And a family history of stroke suggests a genetic predisposition to vascular disease.
The problem is that none of these risk factors produce symptoms in the carotid arteries themselves. You can have significant stenosis — 60%, 70%, even higher — and feel completely normal until the stroke occurs.
The reason early carotid screening is so important is that there is an enormous amount that can be done once disease is identified. Moderate stenosis can be managed aggressively with medication, blood pressure control, and lifestyle modification. Severe stenosis may warrant a vascular surgery consultation for a preventive procedure called carotid endarterectomy — one of the most effective stroke prevention interventions available.
But all of these options require knowing the disease exists. A 45-minute carotid ultrasound at BlackPoint Diagnostics gives you and your physician the exact information needed to act — before a stroke changes everything.
No referral needed. Results from a board-certified cardiologist in 24–48 hours.
Book a Carotid ScreeningBook your screening or reach out with any questions about your cardiovascular health.
Southern Maine · Mobile service throughout Midcoast Maine