One of the greatest advances in modern medicine has been our ability to detect heart disease before it causes a heart attack. Today, we have several excellent noninvasive tests that can identify plaque, measure blood flow and estimate a person’s cardiovascular risk. Patients often ask me, “Which heart test is the best?” The answer is simple: there isn’t one perfect test. Each test answers a different question, and the right choice depends on your symptoms, medical history, family history and overall risk.
Think of diagnosing coronary artery disease like solving a mystery. Every test provides another clue. Most of the time, those clues fit together. Occasionally, however, the test results appear reassuring while the patient sitting in front of us tells a very different story. That’s when experience and clinical judgment become just as important as technology.
Exercise treadmill tests and stress imaging studies, including nuclear stress tests and stress echocardiograms, remain valuable tools for detecting reduced blood flow to the heart. However, like every medical test, they have limitations.
Imagine a room where every light bulb has dimmed equally. Because there isn’t one brighter bulb for comparison, the room may still appear adequately lit. A traditional nuclear stress test works similarly by comparing blood flow from one part of the heart to another. If all three major coronary arteries are significantly narrowed, blood flow may be reduced throughout the heart equally, making the study appear normal despite serious disease. This uncommon phenomenon is known as balanced ischemia.
Another useful test is the coronary calcium score, a quick CT scan that measures calcium deposits in the coronary arteries. A high calcium score doesn’t necessarily identify a severe blockage, but it does tell us that coronary artery disease is present and that future risk is significantly increased.
One of the most exciting advances in cardiovascular medicine is the combination of coronary CT angiography and PET imaging. CT allows us to see plaque and narrowing within the coronary arteries, while PET measures the amount of blood actually reaching the heart muscle. Together, these technologies provide one of the most complete noninvasive evaluations available and can identify problems, including balanced ischemia, that conventional testing may occasionally miss.
Despite these advances, coronary angiography remains the gold standard when important questions remain unanswered. Through a tiny puncture in the wrist, a catheter is guided to the heart, allowing physicians to see the coronary arteries directly. If a significant blockage is found, a stent can often be placed immediately during the same procedure, restoring blood flow before permanent heart damage occurs.
Recently, I cared for a gentleman with a markedly elevated calcium score, a normal stress test, classic symptoms of angina, and a strong family history of heart disease. Because his story didn’t match his test results, we proceeded with coronary angiography. It revealed severe blockages in multiple coronary arteries that had been hidden by balanced ischemia. We were able to treat them successfully with stents, relieving his symptoms and, quite possibly, preventing a future heart attack.
The lesson is simple: technology is an extraordinary partner in modern medicine, but no single test replaces thoughtful clinical judgment. The best care comes from matching the right test to the right patient—and knowing when it’s time to look beyond the test itself.
Golden State Heart and Vascular, with offices in Monterey, Salinas, Watsonville, Los Gatos, Burlingame, and Mountain View, is the exclusive provider of heart and vascular editorial in Cypress Coast Living magazine. For more information, please visit www.gshav.com.
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