After 20 Years in Cardiology, I Stopped Trusting Stress Tests

Your stress test came back normal. Your doctor said you're fine. Fifty percent of people who have their first heart attack had no idea they had heart disease, and many of them passed a stress test in the months before. 

A stress test only tells you whether your most severe blockages are already restricting blood flow. It cannot find the softer, smaller deposits that are far more likely to rupture. A normal result is not a clean bill of health for your arteries.

In this episode, I'm going to show you what a stress test can and cannot find, why I stopped ordering them the same way after 20 years, and exactly what questions are worth asking at your next cardiac appointment.

⏱️ TIMESTAMPS
0:00 - Why Stress Tests Miss the Most Dangerous Cardiac Risk
1:05 - What a Stress Test Actually Measures (And What It Doesn't)
2:00 - Why Even a Low Calcium Score Can Leave You at Risk
4:01 - Soft Plaque: The Silent Threat No Standard Test Can Find
4:47 - The Pattern I Couldn't Ignore After 20 Years in Cardiology
5:39 - What Every Patient Who Slipped Through Had in Common
6:44 - What I Now Believe About Heart Attack Risk
7:44 - Patient Story: No Symptoms. Normal Test. Significant Plaque.
9:00 - Three Questions to Ask Your Doctor Right Now
9:52 - Your Action Steps Before Your Next Appointment

❓ QUESTIONS ANSWERED

Q: Can you have heart disease if your stress test came back normal?
A: Yes. A stress test only detects blockages that are 60 to 70 percent or greater. The deposits most likely to rupture and cause a heart attack are smaller and softer, and don't restrict blood flow enough to trigger a result. A normal stress test means no severe blockage was detected, not that your arteries are clear.

Q: What is soft plaque and why is it more dangerous than calcified plaque?
A: Soft plaque sits inside the artery wall, produces no symptoms, and won't appear on a stress test or basic calcium score. When it ruptures, it triggers a sudden clot. Most heart attacks are caused by soft plaque in people who had no prior warning signs and looked fine on standard tests.

Q: What test can actually detect soft plaque in the arteries?
A: A coronary CTA with AI imaging looks directly inside the artery wall and identifies both soft and hard plaque before symptoms develop. It provides a far more complete picture of your real cardiac risk than a treadmill test or a standard lipid panel.

📱 RESOURCES

Youtube: https://www.youtube.com/@DrMonaShahMD
Website: www.drmonashah.com
IG: https://www.instagram.com/drmonashahmd/
Blog: https://drmonashah.wordpress.com/

🔔 Subscribe to this podcast for weekly content on what preventive cardiology actually looks like, including the tests, labs, and conversations most cardiologists never start.

ABOUT DR. MONA SHAH: Dr. Mona Shah is a triple board-certified cardiologist in cardiology, holistic medicine, and coronary CT. After 20 years inside conventional cardiology, she left to build a practice that does what the standard system rarely does: look inside the artery wall before something goes wrong. She uses advanced imaging, including coronary CTA with AI analysis, to give patients a real picture of their cardiac risk. She specializes in patients with a family history of heart disease, elevated ApoB or Lp(a), and anyone who has been told they're fine but still isn't sure.

#HeartDisease #StressTest #PreventiveCardiology #CoronaryCTA #HeartAttackPrevention

Transcript

SPEAKER_00 0:00

I ordered stress tests for 20 years, thousands of them. What I learned about what they actually miss is why I practice completely differently now. Whether you've already had one or your doctor is recommending one soon, watch this. Because there's a giant gap between what a stress test finds and what your heart actually needs someone to find. And it's the people in that gap that get hurt. I spent 20 years inside conventional cardiology, seeing 25 to 30 patients a day. I ordered stress tests the way every cardiologist does, because that's what the system trained me to do. And over time, I kept seeing the same thing happen to patients who had passed theirs. And once I saw it, I couldn't unsee it. I'm going to walk you through what I used to believe about stress tests, why I stopped believing it, and what I do now instead. By the end of this, you'll have the same information I wish I'd had before I ordered thousands of them. I used to tell patients that if they passed their stress test, they were cleared. Their heart's good to go. That was the standard. A stress test made sense as a screening tool. You get on a treadmill, you push your heart, and we watch to see if the blood supply can meet the demand. If the heart handles that load without showing signs of trouble, the thinking was you're not in danger. And the hospitals used it. Office practices used it. We used it during our training. It was a tool we all had, and so it was a tool that we all used. And over time, we also started using coronary calcium scores more often to better assess risk earlier, especially in prevention. That was an important step forward because calcium scoring can identify calcified plaque before someone develops symptoms. But calcium scores still only detect hardened plaque. They do not show soft plaque, the kind that is often more unstable and more likely to rupture. That became one of the biggest limitations in cardiovascular prevention. A patient could have a low calcium score or even a normal stress test and still carry a significant amount of dangerous soft plaque inside the arteries. So even as our screening improved, there was still a major piece of the picture we often could not see. What a stress test actually shows is whether your largest blockages, the ones over 60 to 70%, are severe enough to cut off blood flow during exertion. That sounds like a useful thing to know, and it absolutely is. But here's what it completely misses. 60 to 80% of the blockages that cause heart attacks are not that severe. They're the smaller, softer deposits that sit quietly inside the artery wall and rupture without any warning. A stress test will never find those. It isn't designed to. I've told patients that they're good to go when I shouldn't have. Not because I was careless, because a test I was using was never capable of finding the thing that was most likely to kill them. What kept bothering me was how many people were still walking around feeling safe while we had no idea what was actually happening inside their arteries. The stress test wasn't wrong as a piece of equipment. It was wrong as a guarantee. So what was actually happening to the patients who passed their stress test and then had a heart attack anyway. When a patient passed our stress test, the expectation was straightforward. Their heart handled high demand. No dangerous blockages were detected. Come back in a year. The test did its job. The patient felt reassured, and we moved on. That was a workflow and it looked fine on paper. What was actually happening is that a large percentage of these patients had plaque building inside their arteries that the stress test couldn't see. It's not designed to see that. Specifically, soft plaque. Soft plaque doesn't block blood flow enough to show up on a stress test, but it's a kind that can rupture. When soft plaque ruptures, it triggers a clot. That clot blocks the artery, and suddenly and completely that's a heart attack. And the person who just had it often had a normal stress test six months before. 50% of people who have their first heart attack had no idea they had heart disease. A lot of those people had passed a stress test or had a low calcium score. And what made that impossible for me to keep going was that this pattern was consistent. Patients who looked clean on paper, patients who were doing the right things, and then something happened that no one saw coming because we had been looking at the wrong thing. There was a specific moment when this stopped being an abstract concern and became something I could not keep ordering the same way anymore or for the same reasons. If this is landing differently than what you've been told by your own doctor, subscribe. Every week I put out content on what the conventional system misses when it comes to your heart and what you can actually do about it. I kept seeing patients come in after a cardiac event who should not have had one by every metric the system had used to evaluate them. Their stress tests were fine, their basic cholesterol was fine, they were exercising, they were watching what they ate, they were doing what their doctors told them to do. And then something happened anyway. Not once, not twice, over and over. Once I started looking for what these patients had in common, the answer was always the same. Nobody had ever looked inside their arteries. Nobody had ever checked for soft plaque. Nobody had ever run the labs that actually tell you what your real risk is. The standard workup had checked a box. It had not answered the question. Ask yourself these three things right now. Have you ever passed a stress test and been told your heart is fine, but you still have a nagging feeling that something isn't being checked? Do you have a family history of heart disease and has any doctor ever looked inside your arteries, not just run a standard blood panel? Has anyone ever talked to you about the difference between soft plaque and hard plaque and which one is actually more dangerous? If you answered yes to the first two and no to the third, you are in the exact same position as most of the patients I'm describing. Here's what I now believe and what I do for every single patient instead. I now believe that a stress test primarily tells you one thing. Whether your most severe blockages are cutting off blood flow under pressure. It tells you nothing about whether you have soft plaque that is about to rupture. And soft plaque is what kills the majority of people who, quote, should have been fine. If you have been told your stress test is normal and you have a family history of heart disease, or you have elevated cholesterol or any other reason to think your risk might be higher than average, that normal result doesn't answer the questions you actually need answered. It answers a different, narrower question. And the difference matters enormously. I have a patient, 54 years old, who I saw a year ago, who had gone to one of the most respected medical centers in the country. No symptoms, but a family history of heart disease, and his cholesterol was a little bit high. They ran their standard workup and told him he was fine to come back in a year. He came to see me because he wanted a deeper approach. I ordered a coronary CTA with AI imaging, a scan that looks inside the arteries and shows us exactly what kind of plaque is there and how much. He had mild to moderate blockage, no symptoms. He had soft plaque, a lot of soft plaque. We would have never known this on a stress test, but 60 to 80 percent of blockages at that level are the ones that can rupture. He changed his diet, he lost weight, and we put him on an aggressive prevention plan. He is doing great, and we're gonna keep following this because this is a marathon, not a sprint. Stop treating a past stress test as a clean bill of health for your arteries. It is not that. It was never designed to be for that. Start asking your doctor specifically about your soft plaque risk, your APOB, your lipoprotein A, and whether or not you could be a candidate for getting one of these scans, a coronary CTA. Those are the tools that actually look inside the arteries. That is a question worth asking. And here's a specific action I now tell most of my patients who walk in, the thing I wish I had offered people 20 years ago. The stress test was built to catch the most severe blockages, the ones that are already restricting blood flow significantly. But the heart attack risk that goes undetected is not from those blockages. It's from the soft, unstable deposits that can rupture at any level of severity. The only way to find those is to look at the arteries directly. That requires a different test. And knowing that test now exists is the first step. We didn't have a coronary CTA 30 years ago. We have it now, and it's available in so many centers. Think of it this way: a stress test is like checking whether a bridge is about to collapse by driving a heavy truck across it. If it holds, you call it safe. But if the real risk is a hairline crack in the support beam, that only shows up on a detailed structural scan. The truck test will never find it. You passed. The bridge has a crack, you don't know. When you know what is actually happening inside your arteries, everything changes. You stop relying on a number or a test result that was never designed to answer your actual question. You start making decisions based on what is real. How aggressive do you need to be? Here's what to do before your next appointment. Write down whether you have a family history of heart disease, elevated cholesterol, high blood pressure, insulin resistance, or any reason your doctor has raised a flag about your heart. Write down whether your cardiac workup has ever included anything beyond a standard lipid panel and a stress test or an EKG. If not, you have not had a full picture yet. Write down three specific questions to bring to your next appointment. Have you checked my APOB? Have you checked my lipoprotein A? Am I a candidate for a coronary CTA with AI plaque imaging? And if not, at least ask if you can get a calcium score. If your doctor says those tests are unnecessary without reviewing your history and your risk factors, push back a little bit, you deserve a real answer. For 20 years, I've been handing people reassurance that was based on an incomplete picture. I believed I was doing the right thing because a system I trained in told me I was. What I know now is that the stress test was never designed to find the most dangerous plaque. It was designed to find the most severe blockage. Those are the two different things. You've been living with a past stress test and a family history that keeps you up at night. I want you to know that there is a more complete answer available. Go get it. The next video I want you to watch is about some of the biggest mistakes health conscious people make when it comes to protecting their heart. It's appearing on your screen now.