What is EFAST and What’s Changing?
Eko has upgraded the AI algorithm powering your heart sound analysis to EFAST (Eko Fast Algorithm for Structural Murmurs). This next-generation, FDA-cleared technology represents a significant upgrade in both accuracy and clinical usefulness for eligible users.
From "All Murmurs" to "Structural Murmurs" The most important change is how the algorithm identifies murmurs. The legacy algorithm flagged any murmur, including "innocent" or "flow" murmurs, which are harmless sounds caused by normal blood flow. EFAST is more targeted—it specifically filters out these harmless sounds and only flags structural (pathologic) murmurs, which are more likely to indicate an underlying heart condition. This results in fewer false positives and more clinically meaningful data.
Enhanced Accuracy and Precision EFAST also delivers a major boost in Atrial Fibrillation (AFib) detection, with sensitivity increasing from 73.1% to 94.7%. Additionally, we have updated our terminology to provide you with more descriptive and clearer results.
FAQs
What are the new terms for heart rate results?
If an ECG is available, EFAST now uses more descriptive phrasing for heart rate. Instead of just "Tachycardia" or "Bradycardia," you will see "Sinus tachycardia" or "Sinus bradycardia".
What is an "Unspecified rhythm"?
This term replaces "Unclassified ECG". It simply means the algorithm could not categorize the rhythm in that specific recording—not necessarily that something is wrong. If you see this frequently, ensure you are in a quiet environment and have good skin contact for a cleaner recording.
Why did my result change from "No murmur" to "No structural murmur"?
This is expected and reflects the improved precision of EFAST. Your previous result likely detected a harmless flow murmur. Because EFAST only flags murmurs associated with heart disease, "No structural murmur" is a more meaningful and reassuring result.
Who is eligible for these EFAST updates?
EFAST is automatically available to users in the United States who have an active Eko+ membership, use a Littmann CORE, CORE attachment, or CORE 500 device, and have the Eko App updated to version 5.43.0 or higher.
Why doesn't my DUO device show these new results?
EFAST is currently compatible only with Littmann CORE and CORE 500 series devices. DUO devices will continue to receive high-quality analysis through our existing EAS algorithm.
Is EFAST available outside the U.S.?
EFAST is currently FDA-cleared for the U.S. market only. We cannot share a timeline for international availability at this time.