The FAINT score beat them by nearly 19 percentage points.
Each year, millions of Americans pass briefly out of consciousness and into emergency rooms, carrying within them a hidden spectrum of risk — from the harmless to the life-threatening. Medicine has long relied on the trained intuition of physicians to sort the benign from the dangerous, but intuition, however skilled, carries blind spots. Two clinical scoring tools, the CSRS and the FAINT score, have now been rigorously tested against real outcomes, and one of them — FAINT — has demonstrated that a structured checklist can see what even experienced doctors sometimes cannot.
- Syncope fills emergency departments daily, but roughly one in ten patients conceals a serious condition — arrhythmia, pulmonary embolism, aortic dissection — that physicians miss between a third and half the time.
- A prospective, multicenter study of 1,263 patients put two risk-scoring systems to the test, tracking real outcomes over 30 days to measure whether structured tools could outperform clinical instinct.
- The FAINT score identified serious cardiac risk with 96.7% sensitivity and a 98.8% negative predictive value — surpassing physician judgment by nearly 19 percentage points in a finding that challenges the primacy of intuition in triage.
- The CSRS performed respectably but did not significantly exceed what doctors already estimated on their own, making FAINT the clearer candidate for standardized adoption.
- The path forward is visible but not yet traveled — widespread integration of FAINT into ED syncope protocols could reduce missed diagnoses and allow safer, more confident discharge of low-risk patients.
Every day, patients arrive in American emergency departments having briefly lost consciousness — dizzy, disoriented, and often apparently fine. Syncope accounts for two to three percent of all ED visits, and most cases resolve without incident. But concealed within that seemingly benign population is a dangerous minority: roughly one in ten patients is harboring something serious — a life-threatening arrhythmia, a pulmonary embolism, a brain bleed. The trouble is that physicians, working quickly and relying on clinical intuition, miss these conditions somewhere between a third and half the time.
Two scoring systems exist to close that gap. The Canadian Syncope Risk Score and the FAINT score each distill clinical findings into a number, signaling whether a patient can safely go home or needs urgent investigation. A new study published in JAMA Network Open tested both tools against real outcomes in a diverse American population — 1,263 patients aged 40 and older who left the ED without a serious diagnosis already in hand. Researchers calculated both scores for each patient, recorded the treating physicians' own probability estimates, and then followed everyone for thirty days.
Seventy-four patients — just under six percent — experienced a serious adverse outcome. The FAINT score, when it classified someone as low-risk, was correct 98.8% of the time, and it caught 96.7% of patients who would remain well. More strikingly, it outperformed physician judgment by nearly 19 percentage points in detecting serious cardiac outcomes. The CSRS was useful but did not meaningfully exceed what doctors already estimated on their own.
The practical meaning is direct: a structured checklist can see what intuition lets slip through. A patient arrives with a fainting spell; the clinician runs through the FAINT criteria; a score of zero offers near-certainty that no cardiac catastrophe awaits in the coming month. The study was prospective, multicenter, and observational — reflecting the complicated reality of how medicine actually works, not an idealized trial. The evidence was rated good, the second-highest tier of confidence. Whether emergency departments will actually adopt the tool at scale remains the open question.
Every day in American emergency departments, patients arrive dizzy, disoriented, having lost consciousness for seconds or minutes. Syncope—a sudden fainting spell—accounts for roughly two to three out of every hundred ED visits. Most of these patients recover quickly and seem fine. But hidden inside that apparently benign group is danger: about one in ten of them are actually harboring something serious. A dangerous heart rhythm. A heart attack. A blood clot in the lungs. A tear in the aorta. Bleeding in the brain. The problem is that doctors, working fast and relying on intuition, miss these conditions roughly a third to half the time.
Two scoring systems have been developed to catch what human judgment misses. The Canadian Syncope Risk Score and the FAINT score—each a checklist of clinical findings that, when tallied, produces a number indicating whether a patient is likely safe to send home or needs aggressive workup. A new study published in JAMA Network Open tested both tools in a real American population to see if they actually work.
Researchers enrolled 1,263 patients aged 40 and older who came to the ED with syncope or presyncope and left without a serious diagnosis already identified. The average patient was nearly 65 years old; just over half were women. For each patient, the research team calculated both the CSRS and FAINT scores. They also asked the treating physicians to estimate, on a scale from zero to 100 percent, how likely they thought the patient was to suffer a serious adverse event in the next 30 days. Then the researchers followed everyone for a month and counted what actually happened.
Seventy-four patients—5.9 percent of the cohort—experienced a serious adverse outcome. Sixty-two had a serious cardiac event specifically. When the FAINT score classified a patient as low-risk (a score of zero), it caught 96.7 percent of the patients who would actually remain well over the next month. Its negative predictive value—the probability that a low-risk score truly meant low risk—was 98.8 percent. The CSRS performed respectably but not as sharply, with a sensitivity of 91.9 percent and a negative predictive value of 97.5 percent. But the most striking finding was this: the FAINT score was measurably better than the doctors themselves. When physicians estimated risk using their clinical judgment alone, they identified serious cardiac outcomes with only 78 percent sensitivity. The FAINT score beat them by nearly 19 percentage points. The CSRS, while useful, did not significantly outperform physician judgment.
What this means in practice is straightforward. A patient walks into the ED with a fainting spell. The doctor runs through the FAINT criteria—checking for things like abnormal heart rate, abnormal EKG findings, age over 60, and other markers. If the score comes back zero, the doctor can be nearly certain the patient will not suffer a cardiac catastrophe in the coming month. That certainty is stronger than the doctor's gut feeling would have been. It is a tool that catches what intuition lets slip through.
The study was rigorous. It was prospective, meaning researchers followed patients forward in time rather than looking backward at records. It was multicenter, conducted across multiple hospitals. It was observational, not a controlled trial, which means it reflects real-world conditions—the messy, complicated way medicine actually happens. The evidence rating was marked as good, the second-highest tier of confidence.
The implication is clear: emergency departments that adopt the FAINT score as a standard part of syncope evaluation could reduce the number of dangerous conditions that go undetected. They could also improve efficiency, confidently discharging truly low-risk patients without unnecessary testing. The question now is whether hospitals will actually use it.
Notable Quotes
As many as one-third to one-half of serious conditions were not identified during ED evaluation, leading to the development of these scoring tools.— Study findings on missed diagnoses
The Hearth Conversation Another angle on the story
Why does a scoring system beat a doctor's judgment? Isn't experience supposed to count for something?
Experience counts, but it's also subject to bias and fatigue. A doctor seeing their twentieth syncope patient of the day might get faster at ruling things out—but also more likely to miss something. A score is mechanical. It doesn't get tired.
But the CSRS also worked pretty well. Why did FAINT pull ahead?
The FAINT score was more sensitive—it caught more of the actual cases. It's possible FAINT's specific criteria are just better calibrated for cardiac outcomes, or that the way it weights different findings is sharper.
What happens to a patient who gets a low FAINT score but actually does have a problem?
That's the 1.2 percent. It happens. No test is perfect. But 98.8 percent negative predictive value means the risk is genuinely small—small enough that most patients can be safely observed or discharged with clear instructions to return if symptoms change.
Does this mean doctors should stop thinking and just follow the score?
No. The score is a tool, not a replacement. A doctor still needs to listen to the patient, examine them, use judgment about context. But when it comes to the specific question—is this person at risk for a serious cardiac event?—the score is more reliable than intuition alone.
Will hospitals actually use this?
That's the real question. Adoption of clinical decision tools is always slower than the evidence suggests it should be. But if a hospital system wants to reduce missed diagnoses and improve efficiency, this gives them a concrete way to do it.