BpBridge captures measured BP from a Viatom cuff and estimates continuous overnight pressure from your ring's PPG signal — classifying your nocturnal dipping pattern by morning.
Two complementary measurement approaches give you a fuller BP picture than a cuff alone.
Provide a reference BP reading — either by connecting your Viatom BP2W cuff automatically over Bluetooth, or by entering a known value by hand. Each reading is anchored to your ring's PPG signal at that moment, building a calibration profile tuned to your unique physiology.
Wear your Viatom OXYII ring overnight. BpBridge processes the continuous 150 Hz PPG signal — extracting pulse features, filtering motion artifacts, and estimating systolic and diastolic values throughout the night.
In the morning, review your nocturnal BP trend and dipping classification. See whether you dipped normally during sleep, failed to dip, or dipped excessively — patterns with real clinical significance.
Continuous overnight BP estimation, personalised to you.
Reference readings come from your Viatom BP2W cuff (auto-connected via Bluetooth) or entered by hand. Each reading is anchored to your ring's PPG features at that moment — building a personal calibration that accounts for your unique vascular physiology rather than relying on a generic population model.
Unlike a cuff that gives one reading per session, the ring estimates BP continuously while you sleep. See how your pressure evolves across the night — rising, falling, or fluctuating with sleep stages.
A 150 Hz IR/red LED signal is filtered, amplified, and analysed in real time. FIR bandpass filtering, automatic gain control, and peak detection extract pulse features — systolic intervals, amplitude, and perfusion index.
By morning, BpBridge compares your nocturnal BP to your waking baseline and classifies your dipping pattern — a clinically recognised indicator of cardiovascular health.
Estimates taken during movement are automatically flagged with low confidence. High-confidence readings (motion < threshold) are weighted more heavily — ensuring your dipping classification reflects true sleep-time BP.
Perfusion Index (PI) is tracked alongside BP — reflecting peripheral vascular tone. PI spikes and dips can indicate vasoconstriction events, cold extremities, or circulation changes during sleep.
PPG-based BP estimation is only as good as its calibration. BpBridge lets you calibrate your way — and builds a model that fits you, not the average person.
Connect your Viatom BP2W cuff over Bluetooth directly inside NiteBridge. Take a measurement and the reading is captured automatically — no typing required. The cuff reading and the simultaneous PPG waveform from your ring are recorded together as a calibration anchor point.
Don't have the cuff nearby? Enter a known systolic and diastolic reading by hand — from a home monitor, a pharmacy machine, or a recent clinical measurement. BpBridge uses the timestamp to match the entry against your ring's PPG data at that moment.
How much your blood pressure drops during sleep is a recognised cardiovascular health marker.
Blood pressure falls by 10–20% compared to daytime levels. The expected pattern — associated with healthy cardiovascular regulation and restorative sleep.
BP fails to drop adequately during sleep. Associated with increased cardiovascular risk, including higher rates of hypertensive organ damage and adverse cardiac events.
An excessively steep nocturnal dip. May indicate nocturnal hypotension — potentially contributing to ischaemic events during sleep in susceptible individuals.
BpBridge uses PPG-derived estimation — not a validated cuff measurement. Estimates are intended for personal awareness and trend monitoring only. They are not a substitute for clinical blood pressure assessment, and should not be used for diagnosis or to guide treatment decisions. Always consult a qualified healthcare professional for medical advice.
What you need to get started.
BpBridge is part of the NiteBridge app for Android. Contact us to get started.
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