The heart always speaks. But who listens?

Cardiovascular disease remains the world's leading cause of death. But the heart often shows signals before a crisis becomes visible. We are building to help listen earlier, longer, and more clearly.

Clarity for patientsbuilt with clinical discipline.

DiagnAll brings together biomedical engineering, artificial intelligence, and clinical thinking to make long-term heart monitoring easier to understand and easier to act on. Our goal is not to replace clinicians, but to support them with clearer signals, better context, and more continuous data.

Who we are

DiagnAll is a health-tech team building AI-assisted tools for continuous cardiac monitoring. We combine biomedical engineering, ECG signal analysis, and product design to help transform heart data into useful insight for patients and clinicians.

Why it matters

Heart-related risk is often difficult to capture in a single appointment or short recording. More continuous monitoring can help reveal patterns that might otherwise be missed between clinical visits.

Our approach

We focus on discreet wearable sensing, careful AI analysis, and clinically responsible workflows. Cardion is designed to support awareness and review, not to create noise, panic, or unsupported medical claims.

Cardionpredicting heart attacks up to one week in advance.

Our product, Cardion, is the first and only AI-powered ECG patch designed to identify myocardial infarction risk before emergency escalation. Its end-to-end pipeline analyzes a 60-second ECG recording and generates a cardiac risk score across a 1–168 hour prediction window, supporting earlier clinical review for high-risk cardiac patients.

Comfort without compromise image

Comfort without compromise

Cardion replaces bulky wires and traditional monitoring equipment with a compact, non-invasive patch that sticks comfortably to the chest for everyday wear.

Risk Patterns image

Risk Patterns

With just one minute of ECG data, our AI/ML model can uncover hidden warning patterns and estimate heart attack risk up to one week ahead.

Clear Next Steps image

Clear Next Steps

If elevated risk is detected, the app notifies the patient and connects the result with their cardiologist for review.

Teamclinical, technical, human.

We are a multidisciplinary team working across engineering, AI, biomedical signals, product development, and healthcare communication. What connects us is a simple belief: heart monitoring should be more continuous, more understandable, and more human.

Nikos Vardonikolakis

Nikos Vardonikolakis

Founder & CEO

Alexandra Sachinidi

Alexandra Sachinidi

Co-Founder & CPO

Iakovos Sachinidis

Iakovos Sachinidis

Co-Founder

Gerasimos Pnevmatikakis

Gerasimos Pnevmatikakis

Co-Founder & CTO

Milestones

Scroll to explore our progress from concept to validation.

Market Validation

Milestone 01

Market Validation

More than 100 stakeholder interviews and 410+ survey responses helped validate the unmet need, define our high-risk patient segment and shape Cardion's clinical and product direction.

Functional Hardware Prototype

Milestone 02

Functional Hardware Prototype

We developed and tested the first functional Cardion prototype, combining wearable ECG acquisition, embedded electronics and wireless data transmission.

Proof of Concept

Milestone 03

Proof of Concept

We progressed from 12-lead clinical ECG data to 3-lead and ultimately 1-lead myocardial infarction risk prediction, evaluating 10,640 recordings from 8,573 patients and achieving 85.9% AUROC across a 1–168-hour risk window.

End-to-End Pipeline

Milestone 04

End-to-End Pipeline

We built a complete pipeline that captures signals from Cardion's hardware, performs signal-quality checks and preprocessing, and generates a myocardial infarction risk estimate in real time.

Progress you can seemilestones toward safer heart monitoring.

Cardion is still under development, but our work is already moving from research and proof of concept toward product design, validation planning, and clinical collaboration.

  • 1st Place — Ideathon Patras by Piraeus Bank & POS4WORK image

    May 2025

    1st Place — Ideathon Patras by Piraeus Bank & POS4WORK

  • Selected for Piraeus Startup Accelerator image

    July 2025

    Selected for Piraeus Startup Accelerator

  • Orange Grove alumni image

    November 2025

    Orange Grove alumni

  • 1st Place — Startup Universe Greece 2025 image

    December 2025

    1st Place — Startup Universe Greece 2025

  • Participant in Lab to Market by Columbia University & NTUA image

    January 2026

    Participant in Lab to Market by Columbia University & NTUA

We're here to listenreach out.

Whether you are a clinician, researcher, patient, mentor, investor, or future team member, we would be glad to hear from you. Reach out for collaborations, feedback, or questions that doesn't cover.