(252 days)
Not Found
Unknown
The document describes an "algorithm that classifies pulse rate data" and mentions clinical testing of this algorithm, but it does not explicitly state whether this algorithm utilizes AI or ML techniques. The absence of explicit mentions of AI, DNN, or ML makes it impossible to definitively confirm their use based solely on this summary.
No
The device identifies irregular heart rhythms suggestive of AFib but does not treat, cure, mitigate, or prevent disease; it is intended for notification and screening purposes, not diagnosis or treatment.
Yes
The device is intended to analyze pulse rate data to identify episodes of irregular heart rhythms suggestive of atrial fibrillation (AFib) and provide a notification to the user, supplementing the decision for AFib screening. This functionality directly relates to identifying a potential medical condition.
Yes
The device is explicitly described as a "software-only mobile medical application" in the Intended Use section and the Device Description states it "consists of an algorithm... and a mobile application". While it leverages data from a separate hardware device (wrist-worn product), the medical device itself is the software component.
Based on the provided information, the Fitbit Irregular Rhythm Notifications device is not an In Vitro Diagnostic (IVD).
Here's why:
- IVDs analyze samples taken from the human body. The definition of an IVD typically involves the examination of specimens such as blood, urine, tissue, etc., in vitro (outside the body).
- The Fitbit Irregular Rhythm Notifications analyzes pulse rate data collected from the body. It uses PPG sensors on a wrist-worn device to detect changes in blood flow and analyze the pulse rate data. This is a non-invasive method of data collection from the body, not the analysis of a sample taken from the body.
- The intended use is to identify irregular heart rhythms suggestive of AFib based on pulse rate data. This is a physiological measurement and analysis, not a diagnostic test performed on a biological sample.
While the device is a medical device intended to aid in the screening for AFib, its method of operation and the type of data it analyzes do not align with the definition of an In Vitro Diagnostic. It's a software-only mobile medical application that analyzes physiological signals.
N/A
Intended Use / Indications for Use
The Fitbit Irregular Rhythm Notifications is a software-only mobile medical application that is intended to be used with compatible consumer wrist-worn products to analyze pulse rate data to identify episodes of irregular heart rhythms suggestive of atrial fibillation (AFib) and provide a notification to the user.
The Fitbit Irregular Rhythm Notifications is intended for over-the-counter (OTC) use. It is not intended to provide a notification on every episode of irregular rhythm suggestive of AFib and the absence of a notification is not intended to indicate no disease process is present; rather the Fitbit Irregular Rhythm Notifications is intended to opportunistically surface a notification of possible AFib when sufficient data are available for analysis.
These data are only captured when the user's still. Along with the user's risk factors, the Fitbit irreqular Rhythm Notifications can be used to supplement the decision for AFib screening. The Fitbit Irregular Rhythm Notfications is not intended to replace traditional methods of diagnosis or treatment.
The Fitbit Irregular Rhythm Notifications has not been tested for use in people under 22 years of age. It is also not intended for use in individuals previously diagnosed with AFib.
Product codes
QDB
Device Description
The Fitbit Irregular Rhythm Notifications consists of an algorithm that classifies pulse rate data, and a mobile application run within the Fitbit app that serves as the user interface (UI) and device display.
The Fitbit Irregular Rhythm Notifications leverages pulse rate data collected from compatible commercially available, general purpose wrist-worn products (e.g., smartwatch or fithess tracker). Photoplethysmograph (PPG) sensors consist of light-emitting diodes (LED) and photodiodes that detect changes in blood flow of a user's vasculature at any given moment. When the heart beats, it sends a pressure wave through the vasculature causing a blood flow increase. By monitoring the fluctuations the consumer wrist-worn products can measure pulse rate data. When the user is still the sensor detects when individual pulses reach the periphery (i.e., wrist) and measures beat-to-beat intervals.
If the analyzed data are consistent with signs of atrial fibrillation, a notification indicating that a heart rhythm showing signs suggestive of AFib will be displayed to the user. The Fitbit Irregular Rhythm Notifications will only surface a notification of a heart rhythm showing signs of AFib once in a 24-hour period.
The Fitbit Irregular Rhythm Notifications mobile app functions within the Fitbit consumer application and is run on a compatible, user-provided general purpose mobile computing product (e.g., smartphone or tablet). The Fitbit Irregular Rhythm Notifications mobile app serves as the display/user interface for the Fitbit Irregular Rhythm Notifications.
Mentions image processing
Not Found
Mentions AI, DNN, or ML
Not Found
Input Imaging Modality
Photoplethysmograph (PPG)
Anatomical Site
Wrist-worn compatible consumer product with PPG sensors.
Indicated Patient Age Range
22 years or older
Intended User / Care Setting
Over-The-Counter Use
Description of the training set, sample size, data source, and annotation protocol
Not Found
Description of the test set, sample size, data source, and annotation protocol
A clinical study was conducted on the Fitbit Irreqular Rhythm Notifications algorithm. This study recruited subjects from Fitbit's U.S. user population, inviting them to participate in a study. Upon consent, users had their PPG data analyzed for signs consistent with AFib by the algorithm. The users whose data showed signs of AFib were then instructed to schedule a telehealth visit with a clinician. Subjects still meeting the inclusion criteria were then provided with an ECG patch and directed to simultaneously wear both the ECG patch and their Fitbit wrist-wearable, PPG-equipped product for seven (7) consecutive days and nights. Data gathered from the ECG patch was analyzed by medical professionals to determine whether signs of AFib were present and was compared to the corresponding Fitbit algorithm output.
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Bench Testing/Non-Clinical Testing: The Fitbit Irreqular Rhythm Notifications utilizes signals derived from compatible consumer grade wrist-worn products. The wrist-worn products are qualified for use with the software to ensure that the data provided meet signal attribute and quality requirements necessary for heart rhythm analysis and to detect adequate PPG signal quality. Bench testing includes: product signal acquisition testing, aggressor testing for known challenge conditions potentially impacting the quality of PPG signal acquisition, and accuracy assessment of the inputs to the Fitbit Irregular Rhythm Notifications that are derived from the wrist-worn products. Qualification testing is repeated for all qualified wrist-wearable products. The algorithm is tested to ensure that it accepts and rejects data correctly and that it correctly analyzes the input data.
Software Testing Summary: The Fitbit Irregular Rhythm Notifications presents a "moderate" level of concern (LOC) as defined in FDA's Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices (May 11, 2005) (Guidance Document). The software components consist of the Irregular Rhythm Notifications algorithm, which resides/runs on Fitbit servers, and the mobile app used for on-boarding, education and display of notification results. Testing supports that the algorithm analyzes pulse rate data and classifies it as having signs of AFib, having no signs of AFib, or unanalyzable. Testing of the mobile application demonstrates that the Fitbit Irregular Rhythm Notifications mobile application adequately surfaces on-boarding/educational information, generates user notifications when the feature identifies an irregular rhythm suggestive of AFib, and facilitates viewing of that notification.
Human Factors Testing Summary: A human factors study was designed to evaluate the critical and noncritical tasks associated with the use of the device. Human Factors Usability testing was performed using a simulated version of the Fitbit Irregular Rhythm Notifications mobile app, representative of the final app. There were a total of 30 subjects distributed into two (2) user groups: 15 active interest participants adult laypeople (22 years and older) with active interest in AFib, and 15 passive interest participants adult laypeople (22 years and older) with passive interest in AFib. The Human Factors Validation demonstrated that the Fitbit Irregular Rhythm Notifications meets the special control requirements for human factors and usability testing that demonstrates the user can correctly use the device based solely on reading the device labeling, and the user can correctly interpret the device output and understand when to seek medical care. Testing was also performed to assess consumers' ability to correctly self-select if the Irregular Rhythm Notifications app is intended for them. This testing involved 33 subjects, including both users for whom the app is intended, as well as persons outside the app's intended use population. The testing concluded that users can adequately self-select if the device is intended for them.
Clinical Testing Summary: A clinical study was conducted on the Fitbit Irreqular Rhythm Notifications algorithm. This study recruited subjects from Fitbit's U.S. user population, inviting them to participate in a study. Upon consent, users had their PPG data analyzed for signs consistent with AFib by the algorithm. The users whose data showed signs of AFib were then instructed to schedule a telehealth visit with a clinician. Subjects still meeting the inclusion criteria were then provided with an ECG patch and directed to simultaneously wear both the ECG patch and their Fitbit wrist-wearable, PPG-equipped product for seven (7) consecutive days and nights. Data gathered from the ECG patch was analyzed by medical professionals to determine whether signs of AFib were present and was compared to the corresponding Fitbit algorithm output.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
In the 225 subjects who received a positive algorithm detection while wearing the ECG patch, the algorithm's positive predictive value (PPV) was 98.2% (97.5% LCB: 96.4%).
Predicate Device(s)
Reference Device(s)
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information
Not Found
§ 870.2790 Photoplethysmograph analysis software for over-the-counter use.
(a)
Identification. A photoplethysmograph analysis software device for over-the-counter use analyzes photoplethysmograph data and provides information for identifying irregular heart rhythms. This device is not intended to provide a diagnosis.(b)
Classification. Class II (special controls). The special controls for this device are:(1) Clinical performance testing must demonstrate the performance characteristics of the detection algorithm under anticipated conditions of use.
(2) Software verification, validation, and hazard analysis must be performed. Documentation must include a characterization of the technical specifications of the software, including the detection algorithm and its inputs and outputs.
(3) Non-clinical performance testing must demonstrate the ability of the device to detect adequate photoplethysmograph signal quality.
(4) Human factors and usability testing must demonstrate the following:
(i) The user can correctly use the device based solely on reading the device labeling; and
(ii) The user can correctly interpret the device output and understand when to seek medical care.
(5) Labeling must include:
(i) Hardware platform and operating system requirements;
(ii) Situations in which the device may not operate at an expected performance level;
(iii) A summary of the clinical performance testing conducted with the device;
(iv) A description of what the device measures and outputs to the user; and
(v) Guidance on interpretation of any results.
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Image /page/0/Picture/0 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
April 8, 2022
Fitbit Inc Randy Parry Senior Regulatory Affairs Specialist 199 Fremont Street 14th Floor San Francisco, California 94105
Re: K212372
Trade/Device Name: Fitbit Irregular Rhythm Notifications Regulation Number: 21 CFR 870.2790 Regulation Name: Photoplethysmograph Analysis Software For Over-The-Counter Use Regulatory Class: Class II Product Code: QDB Dated: March 8, 2022 Received: March 9, 2022
Dear Randy Parry:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's
1
requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Jennifer Shih Kozen Assistant Director Division of Cardiac Electrophysiology, Diagnostics and Monitoring Devices Office of Cardiovascular Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration Indications for Use
510(k) Number (if known) K212372
Device Name
Fitbit Irreqular Rhythm Notifications
Indications for Use (Describe)
The Fitbit Irregular Rhythm Notifications is a software-only mobile medical application that is intended to be used with compatible consumer wrist-worn products to analyze pulse rate data to identify episodes of irregular heart rhythms suggestive of atrial fibillation (AFib) and provide a notification to the user.
The Fitbit Irregular Rhythm Notifications is intended for over-the-counter (OTC) use. It is not intended to provide a notification on every episode of irregular rhythm suggestive of AFib and the absence of a notification is not intended to indicate no disease process is present; rather the Fitbit Irregular Rhythm Notifications is intended to opportunistically surface a notification of possible AFib when sufficient data are available for analysis.
These data are only captured when the user's still. Along with the user's risk factors, the Fitbit irreqular Rhythm Notifications can be used to supplement the decision for AFib screening. The Fitbit Irregular Rhythm Notfications is not intended to replace traditional methods of diagnosis or treatment.
The Fitbit Irregular Rhythm Notifications has not been tested for use in people under 22 years of age. It is also not intended for use in individuals previously diagnosed with AFib.
Type of Use (Select one or both, as applicable)
□ Prescription Use (Part 21 CFR 801 Subpart D)
X Over-The-Counter Use (21 CFR 801 Subpart C)
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Image /page/3/Picture/0 description: The image shows the Fitbit logo. The logo consists of a stylized turquoise-colored icon made up of small circles arranged in a pattern resembling a stylized person, followed by the word "fitbit" in a dark blue sans-serif font. The icon is positioned to the left of the word "fitbit".
510(K) Summary VII.
1. Submitter Information: Fitbit LLC 199 Fremont Street, 14th Floor
San Francisco, CA 94105
Contact Person: Randy Parry Phone: (415) 985-4778 Email: parran@google.com Date Prepared: March 8, 2022
2. Subject Device Information
Name of Device: Fitbit Irregular Rhythm Notifications Common or Usual Name: Irregular Rhythm Analysis Software Classification Name: Photoplethysmograph Analysis Software For Over-The-Counter Use Regulatory Class: Class II Product Code: QDB - 21 CFR 870.2790
-
- Predicate Device Apple Inc., Irregular Rhythm Notification Feature (DEN180042)
4. Indications for Use
The Fitbit Irregular Rhythm Notifications is a software-only mobile medical application that is intended to be used with compatible consumer wrist-worn products to analyze pulse rate data to identify episodes of irregular heart rhythms suggestive of atrial fibrillation (AFib) and provide a notification to the user.
The Fitbit Irreqular Rhythm Notifications is intended for over-the-counter (OTC) use. It is not intended to provide a notification on every episode of irregular rhythm suggestive of AFib and the absence of a notification is not intended to indicate no disease process is present; rather the Fitbit Irregular Rhythm Notifications is intended to opportunistically surface a notification of possible AFib when sufficient data are available for analysis.
These data are only captured when the user is still. Along with the user's risk factors, the Fitbit Irreqular Rhythm Notifications can be used to supplement the decision for AFib screening. The Fitbit Irreqular Rhythm Notifications is not intended to replace traditional methods of diagnosis or treatment.
The Fitbit Irregular Rhythm Notifications has not been tested for and is not intended for use in people under 22 years of age. It is also not intended for use in individuals previously diaqnosed with AFib.
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Image /page/4/Picture/0 description: The image shows the Fitbit logo. The logo consists of a stylized, teal-colored geometric shape to the left of the word "fitbit" in a dark teal sans-serif font. The geometric shape is made up of several small circles arranged in a grid-like pattern.
5. Device Description
Intended Use
The Fitbit Irregular Rhythm Notifications feature is a medical device (SaMD). The Fitbit Irregular Rhythm Notifications feature analyzes pulse rate data to identify heart rhythms that are consistent with atrial fibrillation (AFib) and if identified, provide a notification to the user.
Technological Characteristics
The Fitbit Irreqular Rhythm Notifications consists of an algorithm that classifies pulse rate data, and a mobile application run within the Fitbit app that serves as the user interface (UI) and device display.
The Fitbit Irregular Rhythm Notifications leverages pulse rate data collected from compatible commercially available, general purpose wrist-worn products (e.g., smartwatch or fithess tracker). Photoplethysmograph (PPG) sensors consist of light-emitting diodes (LED) and photodiodes that detect changes in blood flow of a user's vasculature at any given moment. When the heart beats, it sends a pressure wave through the vasculature causing a blood flow increase. By monitoring the fluctuations the consumer wrist-worn products can measure pulse rate data. When the user is still the sensor detects when individual pulses reach the periphery (i.e., wrist) and measures beat-to-beat intervals.
If the analyzed data are consistent with signs of atrial fibrillation, a notification indicating that a heart rhythm showing signs suggestive of AFib will be displayed to the user. The Fitbit Irregular Rhythm Notifications will only surface a notification of a heart rhythm showing signs of AFib once in a 24-hour period.
The Fitbit Irregular Rhythm Notifications mobile app functions within the Fitbit consumer application and is run on a compatible, user-provided general purpose mobile computing product (e.g., smartphone or tablet). The Fitbit Irregular Rhythm Notifications mobile app serves as the display/user interface for the Fitbit Irregular Rhythm Notifications.
| Table 7.1 Summary of Technological Characteristics and Substantial Equivalence | ||
|---|---|---|
| Subject Device | ||
| Fitbit Irregular Rhythm Notifications | Predicate Device | |
| Apple - Irregular Rhythm Notification | ||
| Intended Use | Analyze pulse rate gathered from | |
| PPG pulse rate data to identify | ||
| episodes of irregular heart rhythms | ||
| suggestive of atrial fibrillation (AFib) | ||
| and provide a notification to the user. | Analyze pulse rate gathered from | |
| PPG pulse rate data to identify | ||
| episodes of irregular heart rhythms | ||
| suggestive of atrial fibrillation (AFib) | ||
| and provide a notification to the user. | ||
| Indications for Use | The Fitbit Irregular Rhythm Notifications | |
| is a software-only mobile medical | ||
| application that is intended to be used | ||
| with compatible consumer wrist-worn | ||
| products to analyze pulse rate data to | ||
| identify episodes of irregular heart | ||
| rhythms suggestive of atrial fibrillation | ||
| (AFib) and provide a notification to the | ||
| user. | ||
| The Fitbit Irregular Rhythm Notifications | ||
| is intended for over-the-counter (OTC) | ||
| use. It is not intended to provide a | ||
| notification on every episode of irregular | ||
| rhythm suggestive of AFib and the | ||
| absence of a notification is not intended | ||
| to indicate no disease process is | ||
| present; rather the Fitbit Irregular | ||
| Rhythm Notifications is intended to | ||
| opportunistically surface a notification of | ||
| possible AFib when sufficient data are | ||
| available for analysis. | ||
| These data are only captured when the | ||
| user is still. Along with the user's risk | ||
| factors, the Fitbit Irregular Rhythm | ||
| Notifications can be used to supplement | ||
| the decision for AFib screening. The | ||
| Fitbit Irregular Rhythm Notifications is | ||
| not intended to replace traditional | ||
| methods of diagnosis or treatment. | ||
| The Fitbit Irregular Rhythm Notifications | ||
| has not been tested for and is not | ||
| intended for use in people under 22 | ||
| years of age. It is also not intended for | ||
| use in individuals previously diagnosed | ||
| with AFib. | The Irregular Rhythm Notification | |
| Feature is a software-only mobile | ||
| medical application that is intended to | ||
| be used with the Apple Watch. The | ||
| feature analyzes pulse rate data to | ||
| identify episodes of irregular heart | ||
| rhythms suggestive of atrial fibrillation | ||
| (AFib) and provides a notification to the | ||
| user. | ||
| The feature is intended for | ||
| over-the-counter (OTC) use. It is not | ||
| intended to provide a notification on | ||
| every episode of irregular rhythm | ||
| suggestive of AFib and the absence of a | ||
| notification is not intended to indicate no | ||
| disease process is present; rather the | ||
| feature is intended to opportunistically | ||
| surface a notification of possible AFib | ||
| when sufficient data are available for | ||
| analysis. | ||
| These data are only captured when the | ||
| user is still. Along with the user's risk | ||
| factors, the feature can be used to | ||
| supplement the decision for AFib | ||
| screening. The feature is not intended to | ||
| replace traditional methods of diagnosis | ||
| or treatment. | ||
| The feature has not been tested for and | ||
| is not intended for use in people under | ||
| 22 years of age. It is also not intended | ||
| for use in individuals previously | ||
| diagnosed with AFib. | ||
| Mechanism of | ||
| Operation | Software-only mobile medical application | |
| that uses inputs from compatible | ||
| consumer wrist-worn PPG sensors to | ||
| analyze pulse rate data to identify | ||
| episodes of irregular heart rhythms | ||
| suggestive of AFib. | Software-only mobile medical | |
| application that uses inputs from | ||
| wrist-worn Apple Watch PPG sensors to | ||
| analyze pulse rate data to identify | ||
| episodes of irregular heart rhythms | ||
| suggestive of AFib. | ||
| Device | ||
| Classification | Class II | Class II |
| FDA Product Code | ||
| and Regulatory | ||
| Classification | QDB - 870.2790 | QDB - 870.2790 |
| Photoplethysmograph analysis software | ||
| for over-the-counter use | Photoplethysmograph analysis software | |
| for over-the-counter use | ||
| Anatomical Site | Wrist-worn compatible consumer | |
| product with PPG sensors. | Wrist-worn Apple Watch with PPG | |
| Sensors | ||
| Patient Population | Individuals (22 years or older) | Individuals (22 years or older) |
| Data storage | Pulse rate data stored locally on | |
| wrist-worn product until transmission to a | ||
| server. | Pulse rate data stored locally on | |
| wrist-worn product until transmission to | ||
| a server. | ||
| Prescription/OTC | OTC | OTC |
| User interface | Mobile application run within the Fitbit | |
| consumer app. | Mobile application run within the iPhone | |
| Apple Health App. | ||
| Use Method | Collects and analyzes tachograms | |
| during periods of stillness or sleep using | ||
| input from PPG sensors. | Collects and analyzes a one-minute | |
| tachogram approximately every 4 hours | ||
| using input from PPG sensors. | ||
| Limiting Factors | Motion, hand and finger movements, | |
| dark tattoos on the wrist, inadequate | ||
| blood flow. | ||
| Does not continuously monitor for signs | ||
| of AFib. | ||
| A lack of notification does not indicate an | ||
| absence of AFib. | Motion, hand and finger movements, | |
| dark tattoos on the wrist, inadequate | ||
| blood flow. | ||
| Does not continuously monitor for signs | ||
| of AFib. | ||
| A lack of notification does not indicate | ||
| an absence of AFib. | ||
| Results of | ||
| algorithm | Tachograms are classified as having | |
| signs of AFib, no signs of AFib or | ||
| unanalyzable. | Tachograms are classified as either | |
| irregular rhythm or not AFib. | ||
| Notification of a heart rate that shows | ||
| signs consistent with atrial fibrillation. | ||
| History of events | History of events consistent with AFib | |
| viewable in the mobile application. | History of events consistent with AFib | |
| viewable in the mobile application. | ||
| Compatible | ||
| devices | Consumer wrist-worn products with PPG | |
| sensors (e.g., smartwatch or fitness | ||
| tracker) that have been qualified for use | ||
| with Fitbit Irregular Heart Rhythm | ||
| Notifications | ||
| Fitbit Sense | ||
| Fitbit Versa | ||
| Fitbit Versa Lite | ||
| Fitbit Inspire 2 | Apple Watch with PPG sensors (series 1 | |
| and later). | ||
| Fitbit Charge 4 | ||
Summary of Technological Characteristics and Substantial Equivalence
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Image /page/5/Picture/0 description: The image shows the Fitbit logo. The logo consists of a teal-colored icon made up of several circles arranged in a diamond shape, followed by the word "fitbit" in a sans-serif font, also in teal. The logo is simple and modern, reflecting the company's focus on health and fitness tracking.
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Image /page/6/Picture/0 description: The image shows the Fitbit logo. The logo consists of a stylized turquoise icon made up of several circles arranged in a geometric pattern, followed by the word "fitbit" in a dark blue sans-serif font. The icon is positioned to the left of the word "fitbit".
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6. Performance Data
Testing verifying the performance requirements of the subject device was conducted and is included in this premarket notification, the results of which support substantial equivalence. A summary of the testing is included below:
Bench Testing/Non-Clinical Testing
The Fitbit Irreqular Rhythm Notifications utilizes signals derived from compatible consumer grade wrist-worn products. The wrist-worn products are qualified for use with the software to ensure that the data provided meet signal attribute and quality requirements necessary for heart rhythm analysis and to detect adequate PPG signal quality. Bench testing includes: product signal acquisition testing, aggressor testing for known challenge conditions potentially impacting the quality of PPG signal acquisition, and accuracy assessment of the inputs to the Fitbit Irregular Rhythm Notifications that are derived from the wrist-worn products. Qualification testing is repeated for all qualified wrist-wearable products. The algorithm is tested to ensure that it accepts and rejects data correctly and that it correctly analyzes the input data.
Software Testing Summary
The Fitbit Irregular Rhythm Notifications presents a "moderate" level of concern (LOC) as defined in FDA's Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices (May 11, 2005) (Guidance Document). The software components consist of the Irregular Rhythm Notifications algorithm, which resides/runs on Fitbit servers, and the mobile app used for on-boarding, education and display of notification results. Testing supports that the algorithm analyzes pulse rate data and classifies it as having signs of AFib, having no signs of AFib, or unanalyzable. Testing of the mobile application demonstrates that the Fitbit Irregular Rhythm Notifications mobile application adequately surfaces on-boarding/educational information, generates user notifications when the feature identifies an irregular rhythm suggestive of AFib, and facilitates viewing of that notification.
Human Factors Testing Summary
A human factors study was designed to evaluate the critical and noncritical tasks associated with the use of the device.
Human Factors Usability testing was performed using a simulated version of the Fitbit Irregular Rhythm Notifications mobile app, representative of the final app. There were a total of 30 subjects distributed into two (2) user groups:
- 15 active interest participants adult laypeople (22 years and older) with active . interest in AFib, defined as individuals who:
- o Have concern regarding AFib and have an active interest in monitoring potential AFib, and
Confidential
K212372 Page 5 of 7
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Image /page/8/Picture/0 description: The image shows the Fitbit logo. The logo consists of a stylized, teal-colored icon to the left of the word "fitbit" in a sans-serif font, also in teal. The icon is made up of a grid of small circles arranged in a diamond shape.
- Would use the app due to high interest o
- 15 passive interest participants adult laypeople (22 years and older) with passive ● interest in AFib, defined as individuals who:
- Do not have concern regarding AFib and do not have an active interest in O monitoring potential AFib. and
- Might use the app due to casual or passing interest. o
The Human Factors Validation demonstrated that the Fitbit Irregular Rhythm Notifications meets the special control requirements for human factors and usability testing that demonstrates the following:
a. The user can correctly use the device based solely on reading the device labeling.
b. The user can correctly interpret the device output and understand when to seek medical care.
Testing was also performed to assess consumers' ability to correctly self-select if the Irregular Rhythm Notifications app is intended for them. This testing involved 33 subjects, including both users for whom the app is intended, as well as persons outside the app's intended use population. The testing concluded that users can adequately self-select if the device is intended for them.
Clinical Testing Summary
A clinical study was conducted on the Fitbit Irreqular Rhythm Notifications algorithm. This study recruited subjects from Fitbit's U.S. user population, inviting them to participate in a study. Upon consent, users had their PPG data analyzed for signs consistent with AFib by the algorithm. The users whose data showed signs of AFib were then instructed to schedule a telehealth visit with a clinician. Subjects still meeting the inclusion criteria were then provided with an ECG patch and directed to simultaneously wear both the ECG patch and their Fitbit wrist-wearable, PPG-equipped product for seven (7) consecutive days and nights. Data gathered from the ECG patch was analyzed by medical professionals to determine whether signs of AFib were present and was compared to the corresponding Fitbit algorithm output.
In the 225 subjects who received a positive algorithm detection while wearing the ECG patch, the algorithm's positive predictive value (PPV) was 98.2% (97.5% LCB: 96.4%) and supports that the subject Fitbit Irreqular Rhythm Notifications is substantially equivalent to the predicate, Apple Inc. Irregular Rhythm Notification. A total of 2,094 adverse events were reported for 1,275 subjects. No adverse events reported were related to the Fitbit Irregular Rhythm Notifications software. Most adverse events were identified as possible risks in the study protocol, namely skin irritation from wearing a Fitbit or ECG patch, stress or anxiety from participating in the study, new information or diagnosis as the result of being in the study and combinations of multiple events.
7. Conclusion
The Fitbit Irregular Heart Rhythm Notifications is as safe and effective as the Apple -Irregular Rhythm Notification. Additionally, minor technological differences between the Fitbit
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feature and its predicate do not raise different questions of safety or effectiveness compared to the predicate. The Fitbit Irregular Heart Rhythm Notifications has the same intended use, indications for use, underlying technological characteristics, and similar principles of operation as the predicate device. Based on the similarities and performance testing, the subject device, Fitbit Irregular Rhythm Notifications, is substantially equivalent to the predicate device.