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Journal

Notes on physiology, earlier.

Essays from Dr Yudara Kularathne, emergency physician and founder of Hii.Health, on digital biomarkers, microvascular vitals, and what it takes to see the body drift before it falls.

8 essays · 50 min total

Digital biomarkers10 min read

Why Dengue Is the Perfect Disease for Microvascular Vitals

The most dangerous hour of dengue looks like recovery. A phone camera, a fingertip, and the gap between them may let us see compensation before collapse.

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Future of medicine7 min read

UVS: Universal Vital Sign — The Physiological Mother of All Vital Signs

Five numbers were designed for a world of snapshots. The body is a movie. What would one continuous signal of physiological stability look like?

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AI and medicine4 min read

Emergency Physician POV: Why Google Health (Fitbit) Coach May Be the Biggest Health-AI Moment of 2026

In resus we read physiology before we read the story. For the first time, a consumer health agent is starting to do the same.

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Clinical perspective3 min read

Decoding Viral Haemorrhagic Fevers: Applying Lessons from Dengue Management to Optimise Ebola Supportive Care

An opinion from an infectious disease physician and an emergency physician. Dengue taught us not to wait for collapse; Ebola care needs the same bedside discipline.

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Wearables4 min read

Wearables Gave Us Heart Rate and SpO₂. Next Comes Microvascular Physiology.

Once a wearable is cheap, passive and comfortable enough for mass adoption it stops being a gadget and becomes a data layer for human physiology. AI will start asking new questions of the signal itself.

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A perspective11 min read

Microvascular Vitals: We Are Using Wearables the Wrong Way

Beyond heart rate and SpO₂, toward a new physiological data layer. We are sitting on a pile of golden microvascular data and compressing it back into old vitals.

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A perspective7 min read

Discovering a New Layer of Vitals for Humans in the Age of AI and Agents

Between vital signs that are objective but vague and medical states that are meaningful but unmeasurable sits a missing middle layer. Microvascular Vitals are a proposal to fill it.

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Regulation4 min read

From Regulatory Battles to Biomarker Breakthroughs: Why the 2026 FDA Update Matters

Regulation is not a rulebook you follow; it is a living organism. Notes from a founder who was early, on the January 2026 shift toward risk-based guidance for clinical decision support and wellness products.

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