Fitbit Sense flags a 164 bpm rhythm, leading to a VT diagnosis

AI system

System: Fitbit Sense ECG app and heart-rate monitoring
Model: Not assessed
Release: Exact release not established.
Application developer: Fitbit (Google)
Role: The watch analyzed cardiac rhythm and flagged an irregular reading.
Configuration: The participant used a Fitbit Sense.
Inputs and outputs: Not assessed
Autonomy: Not assessed
Workflow: The wearer has a Fitbit with the ECG app or heart-rate alerts. A symptomatic tachyarrhythmia occurs while the device is worn and the result prompts care-seeking. Clinicians confirm the rhythm and start treatment.
Human oversight: Not assessed
Relation to AI: The watch's rhythm analysis flagged an irregular 164 bpm rhythm with abnormal QRS morphology, which sent the patient to hospital. The diagnosis and treatment were made by cardiologists from a 12-lead ECG and further tests.
AI contribution: The watch's rhythm analysis flagged an irregular 164 bpm rhythm with abnormal QRS morphology, which sent the patient to hospital. The diagnosis and treatment were made by cardiologists from a 12-lead ECG and further tests.

Benefits

Outcome identifiers: Not assessed
Benefit: detected an irregular heart rate of 164 beats per minute with irregular rhythm
Category: Improved Physical Health
Status: Not assessed
Beneficiary groups: People.
Beneficiaries: Not assessed
Reach: Not assessed
Distribution and access: Not assessed
Duration: Not assessed
Expected?: Yes
Costs and harms: Not assessed

Measurement

Studies: Not assessed
Study design: Not assessed
Measurement: Not assessed
Setting and sample: Not assessed
Measures: detected an irregular heart rate of 164 beats per minute with irregular rhythm
Comparison: Not assessed
Results: detected an irregular heart rate of 164 beats per minute with irregular rhythm
Additional value from AI: Not assessed
Limitations: Not assessed
Denominators: Not assessed
Materials for replication: Not assessed

Money

Kind of value: Not assessed
Amount: Not assessed
Currency and prices: Not assessed
Period and unit: Not assessed
Realization: Not assessed
Recipients and payers: Not assessed
Gross or net: Not assessed
Included costs: Not assessed
Comparison: Not assessed
Method: Not assessed
Return and payback: Not assessed

People and places

Participants: Developer: Fitbit (Google).
Jurisdictions: Benefit: Jamshedpur, India. Developer: United States.
Ownership and control: Not assessed
Dependencies: Not assessed
Cross-border connections: Not assessed
Geopolitical implications: Not assessed

Follow-up

Conditions for replication: The device result is taken to a clinician promptly. Confirmatory ECG and structural work-up are available. Appropriate therapy is accessible.
Replication attempts: Not assessed
Later findings: The only cited source is the case report itself; no later development was found.
Availability: Not assessed
Institutional decision: Not assessed
Grounds: Not assessed
Action and result: Not assessed
Success criterion: Not assessed

Evidence

Source numbers: AIBD-0026-source-0001
Citations: Numbered references below.
Language: Not assessed
Source relationships: Independent
Original evidence: Not assessed
Access and versions: Not assessed
Supported findings: Not assessed
Evidence links: Not assessed
Evidence strength: Not assessed
Missing evidence: Not assessed

Grades

Assessed benefits: People.
Depth: People: 2.
Reasons: People: One man received a confirmed diagnosis of fascicular ventricular tachycardia and effective medical control. A material benefit to one person.
Observed or intended: Not assessed
Rubric: Not assessed
Assessor and date: Not assessed
Alternative assessments: Not assessed
Fill: Independently studied

Entry details

Kind

Not assessed

Related entries

No Fitbit incident exists; the nearest wearable false alarm is Apple Watch Crash Detection misclassifying skiing and dialing 911, harming watch users and dispatchers, the inverse of Fitbit Sense correctly flagging 164 bpm ventricular tachycardia.

Field

Healthcare (cardiology). Consumer wearables.

Purpose

The Fitbit Sense ECG app records a single-lead ECG to assess heart rhythm (its clearance is for atrial fibrillation). Capturing an abnormal rhythm for medical review was its purpose, although VT is outside its validated classification.

Dates

Date basis unassessed: 2023 (precision unassessed). Updated: 21 October 2026.

Stage