Eko Core 500: The AI Powered Digital Stethoscope That Detects Murmurs and AFib

An FDA cleared digital stethoscope with AI algorithms that detect cardiac murmurs and atrial fibrillation in real time, transforming the most iconic instrument in medicine into a screening platform.

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The stethoscope has been the defining symbol of medicine for over 200 years, yet its diagnostic utility depends entirely on the skill of the clinician using it. Studies have consistently shown that auscultation accuracy varies dramatically by provider experience: cardiologists identify murmurs with reasonable consistency, but primary care physicians, nurse practitioners, and physician assistants, the providers who conduct the majority of routine examinations, miss a significant proportion of clinically important heart sounds. A widely cited finding in medical education literature is that many medical students and residents cannot reliably distinguish pathological murmurs from innocent ones.

This human variability problem creates a systematic screening gap. Valvular heart disease, which can be detected by characteristic murmur patterns, affects approximately 2.5% of the general population and over 13% of adults over 75. Many cases progress silently for years because the murmur was either not heard or not recognized during routine examination. By the time symptoms prompt echocardiography referral, disease may have advanced to the point where intervention carries higher risk and lower benefit.

Eko Health addressed this gap by embedding artificial intelligence into the stethoscope itself. The Eko Core 500 does not replace clinical judgment; it augments it, providing an AI analysis layer that flags potential murmurs and atrial fibrillation in real time during routine cardiac auscultation.

What Is the Eko Core 500?

The Eko Core 500 is an FDA cleared digital stethoscope that combines 40x sound amplification with AI powered cardiac analysis algorithms. The device looks and functions like a traditional stethoscope but adds three capabilities that analog stethoscopes cannot provide: digital amplification that makes subtle heart sounds audible, active noise cancellation that reduces ambient interference, and real time AI analysis that screens for cardiac murmurs and atrial fibrillation during the examination.

The AI algorithms process the heart sound recording in seconds and display results on the Eko app: a murmur detection assessment (murmur detected or no murmur detected) and an AFib detection assessment. Both algorithms hold FDA 510(k) clearance for their specific screening functions. The device records and stores the heart sound files digitally, enabling playback, sharing with specialists via telehealth, and longitudinal comparison of recordings over time.

The Core 500 connects via Bluetooth to the Eko app on iOS and Android. An optional Eko Premium subscription ($9.99 per month) adds enhanced features including unlimited cloud storage and advanced reporting. Core AI detection and recording functions work without a subscription. The device retails at $299 and is confirmed HSA and FSA eligible.

The Science Behind AI Cardiac Auscultation

Cardiac auscultation is fundamentally a pattern recognition task. Heart sounds produce characteristic acoustic signatures: the normal S1 and S2 sounds, pathological S3 and S4 sounds, systolic and diastolic murmurs with specific timing, pitch, and radiation patterns that indicate particular valvular abnormalities. Experienced cardiologists internalize these patterns through years of clinical training. AI algorithms learn the same patterns from large datasets of labeled recordings, then apply that learned discrimination to new recordings in real time.

Eko’s murmur detection algorithm was trained on tens of thousands of clinical heart sound recordings labeled by cardiologists. The algorithm identifies acoustic patterns consistent with structural murmurs and distinguishes them from innocent flow murmurs and normal heart sounds. In clinical validation studies, the algorithm demonstrated sensitivity and specificity for murmur detection that exceeded the average performance of non specialist clinicians.

The AFib detection algorithm analyzes the rhythm pattern within the heart sound recording, looking for the irregularly irregular pattern characteristic of atrial fibrillation. This approach is complementary to ECG based AFib detection: while an ECG analyzes electrical activity, the Eko algorithm analyzes mechanical (acoustic) activity, providing a second modality of screening from a different physiological dimension.

The clinical validation data for the BASEL Wearable Study (Mannhart et al., 2023, JACC: Clinical Electrophysiology) demonstrated that consumer ECG devices achieve 58% to 85% sensitivity for AFib detection. Eko’s acoustic approach provides an independent screening pathway that can function alongside or in lieu of ECG based detection, particularly in clinical settings where a stethoscope is already part of the examination workflow.

The broader significance of AI augmented auscultation lies in its potential to standardize a fundamentally variable clinical skill. When every stethoscope examination includes an AI analysis that flags potential abnormalities, the screening yield of routine cardiac examinations increases regardless of the individual clinician’s auscultation expertise.

What the Eko Core 500 Does Well

The Core 500’s 40x amplification transforms subtle heart sounds into clearly audible signals. Soft diastolic murmurs, which are among the most commonly missed auscultation findings, become substantially more detectable with amplification. Active noise cancellation further improves signal quality in busy clinical environments where ambient noise would degrade traditional stethoscope performance.

The real time AI screening provides immediate, actionable feedback during the examination. A clinician placing the stethoscope on a patient’s chest receives a murmur detection result within seconds, enabling real time decision making about whether further evaluation (echocardiography referral) is warranted. This is vastly more practical than post examination analysis, which requires additional steps and may be forgotten in busy clinical workflows.

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Digital recording and playback create a permanent, shareable record of each cardiac examination. In traditional auscultation, heart sounds exist only in the moment of listening and cannot be replayed, shared, or compared over time. The Core 500’s recordings can be sent to a cardiologist for remote review, compared to prior recordings to assess progression, and stored as part of the medical record.

For telehealth applications, the Core 500 enables remote cardiac auscultation. A nurse practitioner in a rural clinic can record heart sounds and share them with a remote cardiologist in real time, bridging the geographic gap between primary care screening and specialist interpretation.

Pricing, Access, and Practical Realities

The Eko Core 500 retails at $299, positioning it as a premium stethoscope but one within reach of individual clinicians, practices, and health conscious consumers who want to perform home cardiac auscultation. The optional Eko Premium subscription at $9.99 per month adds enhanced storage and reporting features. Core AI detection functions are available without subscription.

The device is confirmed HSA and FSA eligible with a Letter of Medical Necessity. For clinicians purchasing the device for professional use, it may also qualify as a tax deductible professional expense. The FDA 510(k) clearance for both murmur detection and AFib detection AI validates its clinical screening capabilities.

The Core 500 is primarily designed for clinical use by healthcare providers, but its consumer accessibility and straightforward operation make it usable by informed patients who want to perform home cardiac screening. However, interpreting heart sounds and AI screening results requires at minimum a basic understanding of cardiac physiology, and abnormal findings should always prompt professional evaluation rather than self diagnosis.

Battery life lasts approximately 9 hours of continuous use, covering a full clinical day. The device charges via USB C. Bluetooth connectivity is required for AI analysis (the stethoscope functions as a standard amplified stethoscope without the app, but AI screening requires the app connection).

Who the Eko Core 500 Is Best For

The Core 500 is primarily designed for healthcare providers: primary care physicians, nurse practitioners, physician assistants, internal medicine physicians, and cardiologists who want AI augmented cardiac screening during routine examinations. Non specialist clinicians who are less confident in their auscultation skills benefit most from the AI overlay, which compensates for the variability in human pattern recognition.

Telehealth providers who need to perform remote cardiac assessment will find the digital recording and sharing capabilities essential for extending auscultation beyond the in person examination. Medical students and residents can use the device as a teaching tool, comparing their own auscultation assessment against the AI analysis and listening to amplified heart sounds that would be subtle or inaudible through a traditional stethoscope.

Health conscious consumers with cardiac risk factors who want to perform home cardiac screening may benefit from the device, particularly if they have a family member with medical training who can assist with proper placement and interpretation. However, the clinical context required for meaningful interpretation of heart sounds limits the standalone value for most consumers compared to dedicated consumer devices like ECG monitors or blood pressure cuffs.

Users seeking personal AFib screening without clinical training should consider a consumer ECG device (AliveCor KardiaMobile, Apple Watch) instead. Users wanting blood pressure monitoring should choose a validated blood pressure monitor. The Core 500 serves a specific niche: cardiac auscultation with AI augmentation.

How the Eko Core 500 Compares

Against the Eko Duo ($399), the Core 500 provides AI stethoscope capabilities without the integrated ECG. The Duo adds a single lead ECG to the stethoscope, enabling simultaneous auscultation and electrocardiographic analysis. For clinicians who want both modalities in one device, the Duo justifies the $100 premium. For clinicians who want AI stethoscope capability alone, the Core 500 provides the essential functionality at a lower price.

Against the Littmann CORE Digital Stethoscope ($399), the Core 500 adds AI murmur and AFib detection that the Littmann CORE does not currently offer. Both provide digital amplification and Bluetooth recording, but the Eko’s AI screening layer is a meaningful clinical differentiator. The Littmann brand carries significant loyalty among clinicians, but the Eko’s AI capabilities represent a genuine functional advantage.

Against traditional analog stethoscopes ($50 to $200 for premium models), the Core 500 adds amplification, noise cancellation, digital recording, and AI screening at a premium. For clinicians who are confident in their auscultation skills and practice in quiet environments, a quality analog stethoscope may suffice. For clinicians who want AI augmented screening or who practice in noisy environments, the Core 500 provides capabilities that analog instruments fundamentally cannot.

Limitations and Open Questions

The Core 500 is a clinician facing tool, and its value depends on proper stethoscope placement and technique. AI analysis of a poorly placed or improperly pressed stethoscope will produce unreliable results. The device does not compensate for fundamental examination technique errors.

The AI algorithms screen for murmurs and AFib but do not diagnose specific valvular conditions. A “murmur detected” result requires echocardiographic follow up to determine the specific valvular pathology, severity, and clinical significance. The screening is a trigger for further evaluation, not a substitute for it.

Published clinical validation data for Eko’s AI algorithms, while encouraging, is still more limited than the extensive validation literature for ECG based consumer devices. The technology is relatively new, and long term outcome studies demonstrating that AI augmented auscultation improves clinical outcomes (earlier detection, better treatment timing, reduced cardiovascular events) have not yet been completed.

The device requires Bluetooth connectivity to a smartphone for AI analysis. In clinical settings without reliable smartphone access, the Core 500 functions as an amplified digital stethoscope but loses its AI screening capability. The $9.99 monthly subscription for Eko Premium adds to ongoing costs for clinicians who want full feature access.

What This Means for Your Health

Cardiovascular disease, including valvular heart disease, is one of the Four Shadows threatening human longevity. The Eko Core 500 represents a shift in how cardiac screening happens: from relying solely on a clinician’s trained ear to augmenting that ear with artificial intelligence that never has a bad day, never gets distracted, and applies the same analytical rigor to every patient.

Within Healthcare Discovery‘s Five Pillars framework, AI augmented cardiac auscultation supports the broader goal of early detection through consistent monitoring. When every routine physical examination includes an AI powered cardiac screen, the probability of detecting valvular disease or AFib at an early, treatable stage increases meaningfully. This is not about replacing physicians; it is about ensuring that the screening step that depends on human auditory pattern recognition gets a computational safety net.

If you are a clinician, the Core 500 is worth evaluating as an upgrade to your current stethoscope. If you are a patient, the practical takeaway is to ask your physician whether they use AI augmented auscultation, or to consider whether home cardiac screening with a device like this complements your existing cardiovascular monitoring routine. The stethoscope has been listening to hearts for two centuries. Now it is beginning to understand what it hears.

Frequently Asked Questions

Is the Eko Core 500 FDA cleared?
Yes. The Eko Core 500 holds FDA 510(k) clearance for its AI powered cardiac murmur detection and atrial fibrillation detection algorithms. The stethoscope hardware is also FDA registered. The clearance validates the AI’s screening capabilities, meaning the algorithms have demonstrated adequate sensitivity and specificity for identifying potential cardiac abnormalities.

Can the Eko Core 500 diagnose heart conditions?
No. The Eko Core 500 is a screening tool, not a diagnostic device. Its AI algorithms flag potential murmurs and atrial fibrillation, but specific diagnosis of valvular conditions requires echocardiography, and AFib confirmation requires clinical ECG evaluation. The device identifies findings that warrant further investigation, not definitive diagnoses.

Does the Eko Core 500 require a subscription?
Core AI detection (murmur screening and AFib detection) and basic recording functions work without a subscription. The optional Eko Premium subscription at $9.99 per month adds unlimited cloud storage, enhanced reporting features, and additional analytical tools. Most clinicians can use the essential screening functions without subscribing.

Is the Eko Core 500 for clinicians or consumers?
The Core 500 is primarily designed for healthcare providers, including physicians, nurse practitioners, physician assistants, and medical students. However, it is available for consumer purchase and can be used by informed individuals for home cardiac screening. Proper stethoscope placement technique and basic understanding of cardiac anatomy are necessary for meaningful results.

How does the Eko Core 500 compare to the Eko Duo?
The Core 500 ($299) provides AI stethoscope capabilities including murmur and AFib detection through heart sound analysis. The Eko Duo ($399) adds a single lead ECG to the stethoscope, enabling simultaneous auscultation and electrocardiographic recording. The Duo provides dual modality cardiac assessment; the Core 500 focuses on auscultation with AI augmentation. The $100 premium for the Duo buys the additional ECG capability.

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