HEART STG SYSTEM AND SOFTWARE
Device Facts
| Record ID | K052283 |
|---|---|
| Device Name | HEART STG SYSTEM AND SOFTWARE |
| Applicant | Stethographics, Inc. |
| Product Code | DQD · Cardiovascular |
| Decision Date | Dec 23, 2005 |
| Decision | SESE |
| Submission Type | Traditional |
| Regulation | 21 CFR 870.1875 |
| Device Class | Class 2 |
| Attributes | Software as a Medical Device |
AI Performance
| Output | Algorithm | Acceptance | Observed | Dev DS | Dev Readers | Test DS | Test Readers |
|---|---|---|---|---|---|---|---|
| Systolic murmur detection | — | — | Sensitivity: 70%; Specificity: 93%; Overall agreement: 83% | STG data set: 91 sounds from 91 patients scheduled for echocardiography | 3 (experienced cardiologists) | Proctor Harvey data set: 363 sounds from 232 patients | 3 (experienced cardiologists) |
Indications for Use
The Stethographics Heart STG System, is an electronic auscultatory device, intended to provide support to the physician in the evaluation of heart sounds in patients. The product will acquire and record the acoustic signals of the heart and analyze these signals. The analysis procedure will identify specific heart sounds that may be present. Identified sounds include S1, S2, and suspected systolic murmurs. The device is indicated for use in the clinical setting, by a physician or by trained personnel who are acting on the orders of a licensed physician. It in not intended as a sole means of diagnosis. The interpretations of heart sounds offered by the Heart STG System are only significant when used in conjunction with physician over-read as well as consideration of all relevant patient data.
Device Story
Heart STG System is software-based analysis tool for electronic stethoscopes; acquires/records acoustic heart signals (20-2000Hz) via compatible electronic stethoscope (e.g., Andromed iStethos, Cardionics e-Scope, 3M E-4000). Software runs on Windows PC; records 20-second .wav files. Algorithm processes signals to identify/mark S1, S2, and suspected systolic murmurs on waveform; calculates heart rate. Used in clinical settings by physicians/trained personnel. Output provides visual markers on waveform to aid physician auscultation; intended to support, not replace, clinical judgment. Benefits include standardized documentation and automated identification of potential murmurs to assist in cardiac assessment.
Clinical Evidence
Bench and clinical testing performed. Clinical evaluation used two datasets: 91 patient recordings (STG data set) and 363 sounds from the Proctor Harvey gold standard course. Performance compared against consensus of 3 cardiologists. STG data set: 83% overall agreement, 70% sensitivity for murmurs, 93% specificity. Proctor Harvey set: 82% overall agreement, 91% sensitivity, 62% specificity. Heart rate correlation with manual calculation was 0.96 and 0.91 for respective datasets. Results indicate performance comparable to inter-cardiologist agreement.
Technological Characteristics
Software-based analysis system for electronic stethoscopes. Input: 20-2000Hz acoustic signals via 16-bit mono .wav files. Sampling frequency: 8,000 Hz. Compatible with standard electronic stethoscopes. Operates on Windows-based PC. Connectivity: Standalone software application. No specific material standards or sterilization requirements listed as it is a software/accessory system.
Indications for Use
Indicated for use in clinical settings by physicians or trained personnel under physician orders to support evaluation of heart sounds in patients. Identifies S1, S2, and suspected systolic murmurs. Not for use as a sole diagnostic tool.
Regulatory Classification
Identification
Manual stethoscope: A mechanical device used to project the sounds associated with the heart, arteries, and veins and other internal organs. Electronic stethoscope: An electrically amplified device used to project the sounds associated with the heart, arteries, and veins and other internal organs.
Special Controls
*Classification.* Class II (special controls). The device, when it is a lung sound monitor, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 870.9.
Predicate Devices
- Zargis' Acoustic Cardioscan (K031517)
Submission Summary (Full Text)
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DEC 2 3 2005
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K052283
115
### Stethographics, Heart STG System 510(k) Summary
#### Company:
Stethographics, Inc 1153 Centre Street Boston, MA
#### Owner:
Raymond Murphy 1153 Centre St. Boston, MA Phone: (617) 983-7259 Fax: 617-522-4156
#### Contact:
Rozanne Paciej Stethographics, Inc 1153 Centre Street Boston, MA
#### Date Prepared:
August 17, 2005
#### Name of Device:
Stethographics Heart STG System
#### Common Name of Device:
Electronic Stethoscope
#### Classification Name:
Heart STG System 21 CFR 870.1870
#### Predicate Devices:
The Stethographics Heart STG System is substantially equivalent to the Zargis' Acoustic Cardioscan (#K031517).
Stethographics 510(k)
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#### Intended Use:
The Stethographics Heart STG is software intended to provide support to the physician in the evaluation of heart sounds in patients.
The product will acquire and record the acoustic signals of the heart and analyze these The product will acquire and reversity identify specific heart sounds that may be present. Identified sounds include S1, S2, and suspected systolic murmurs.
The device is indicated for use in the clinical setting, by a physician or by trained The device is indicated for use in the entired physician. It in not intended as a sole means of diagnosis.
The interpretations of heart sounds offered by the Heart STG System are only significant The microletonio of near with physician over-read as well as consideration of all relevant patient data.
#### Device Description:
The Heart STG is software intended to provide support to medical personnel in the The Freart STO is software mension vare records and analyzes an acoustic signal of the e valuation of near bounds - aids the healthcare provider by marking SI, S2, and suspected systolic murmurs on the waveform.
As a complete system the Heart STG system consists of an electronic stethoscope and As a complete system the rical by on a computer with Windows operating system. The user must provide a compatible electronic stethoscope and a computer.
#### Technological Characteristics:
The technological characteristics of the new device are compatible to those of the predicate devices.
#### Performance Data:
Both bench testing and clinical testing were performed to ensure that the device performs Doth ochen testing and chilied tooling in this pre-market notification includes descriptive as intended. The intended supplied in the echnological characteristics.
This information is provided pursuant to the requirements of the Safe Medical Devices Act of 1990 (SMDA).
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| Device Specification | |
|---------------------------|--------------------------------------------------------------------------------------------------------|
| Recording frequency range | 20Hz to 2000Hz |
| Sampling frequency | 8,000 Hz |
| Data recording | Standard .wav (PCM) files at resolution of 16 Bit, Mono. |
| Recording time | 20 seconds |
| Acoustic sensor | Electronic stethoscope. Compatible models include Andromed<br>iStethos, Cardionics e-Scope, 3M E-4000. |
| Number of sensors | 1 |
## ----------------------------------------------------------------------------------------------------------------Device Snecification
# Heart Sound Analysis STG Performance Data
In order to evaluate the Heart STG with both common heart disorders and more rare disorders, two different sets of cardiac sounds were utilized. The first set of cardiac fare disorders, two allerentise of Heart STG to record 91 patients that were scheduled Sounds were obtained of assessment (referred to as the STG data set). The second set was for conocurdio graphy abbeart sounds provided in the Clinical Auscultation of the Cardiovascular System, by Proctor Harvey and David C. Canfield (referred to as the Cardiovasoular Systems of Proctor Harvey course is considered the gold standard for I roctor frai vey tata bething and covers a broad range of heart disorders (363 sounds total), both common and rare. All sounds were graded by three experienced cardiologists. total), both common and fare. In be ositive when 2 out of 3 cardiologists agreed on the presence of murmur.
The STG data set included 91 sounds from 91 patients that were scheduled for th echocardiography assessment. Average age was 61±17 years (range 23 to 94). The cender distribution in this population was 44% male and 56% female. The patients were gender distribution in this peparates recording. The STG recorded 20 second sounds asked to nota then orean ouring stres STG performance to that of the cardiologists. The '+' indicates murmur-positive sounds and '-' indicates murmur-negative sounds.
| | | Table 1. STG compared to 2 out of 3 cardiologists. STG Data Set. | |
|--|--|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--|
| | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | |
| Number of sounds 91 | 2 out of 3 cardiologists + | 2 out of 3 cardiologists - |
|---------------------|----------------------------|----------------------------|
| Heart STG + | 23 | 4 |
| Heart STG - | 10 | 54 |
The corresponding overall percent agreement = 100%*(23 + 54)/91 = 83% The contesponding overall percent adjoonists -positive = 100%*(23)(23+10) = 70% Agreement of the STG with 2/3 cardiologists-negative = 100%*(54)/(54+4) = 93%
The Proctor Harvey data set included 363 sounds from 232 patients. Sixty-three sounds were recorded from children, 300 from adults. The Proctor Harvey data set is sounds were recorded from only of common and less common heart pathologies and, represemative of grout namber of be algorithm's performance in both common and less ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Stethographics 510(k)
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-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------common heart conditions. Table 2 compares STG performance to that of the cardiologists.
## Table 2. STG compared to 2 out of 3 cardiologists. Proctor Harvey Data Set.
| Number of sounds 363 | 2 out of 3 cardiologists<br>+ | 2 out of 3 cardiologists<br>- |
|----------------------|-------------------------------|-------------------------------|
| Heart STG + | 227 | 43 |
| Heart STG - | 23 | 70 |
The corresponding overall percent agreement = 100%*(227 + 70)/363 = 82% The concesponaing & verair p 2/3 cardiologists-positive = 100%*(227)(227+23) = 91% Agreement of the STG with 2/3 cardiologists-negative = 100%*(70)/(70+43) = 62%
The agreement between cardiologists was also calculated, Tables 3 and 4, columns 3 to 8.
### Table 3. Agreement between cardiologists. STG Data Set.
| | STG<br>compared to<br>2 out of 3<br>cardiologists | Cardiologist<br>1 with<br>cardiologist<br>2 as a gold<br>standard | Cardiologist<br>1 with<br>cardiologist<br>3 as a gold<br>standard | Cardiologist<br>2 with<br>cardiologist<br>1 as a gold<br>standard | Cardiologist<br>2 with<br>cardiologist<br>3 as a gold<br>standard | Cardiologist<br>3 with<br>cardiologist<br>1 as a gold<br>standard | Cardiologist<br>3 with<br>cardiologist<br>2 as a gold<br>standard |
|------------------------------------------|---------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|
| Agreement<br>with<br>murmur-<br>positive | 70 | 91 | 100 | 72 | 93 | 67 | 79 |
| Agreement<br>with<br>murmur-<br>negative | 93 | 79 | 77 | 94 | 89 | 100 | 96 |
## Table 4. Agreement between cardiologists. Proctor Harvey Data Set.
| | STG<br>compared to<br>2 out of 3<br>cardiologists | Cardiologist<br>1 with<br>cardiologist<br>2 as a gold<br>standard | Cardiologist<br>1 with<br>cardiologist<br>3 as a gold<br>standard | Cardiologist<br>2 with<br>cardiologist<br>1 as a gold<br>standard | Cardiologist<br>2 with<br>cardiologist<br>3 as a gold<br>standard | Cardiologist<br>3 with<br>cardiologist<br>1 as a gold<br>standard | Cardiologist<br>3 with<br>cardiologist<br>2 as a gold<br>standard |
|------------------------------------------|---------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|-------------------------------------------------------------------|
| Agreement<br>with<br>murmur-<br>positive | 91 | 97 | 97 | 83 | 94 | 82 | 93 |
| Agreement<br>with | 62 | 61 | 60 | 91 | 86 | 91 | 88 |
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| | =469========================================================================================================================================================================== | | | |
|----------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--|--|--|
| | | | | |
| murmur- | | | | |
| negative | | | | |
Thus, the STG agreement with 2/3 cardiologists was found to be comparable to that measured among experienced cardiologists.
Heart Rate (HR) was validated by comparing the HR calculated by the STG to that Treat Rale (TIT) was vanuated by contpassion. The correlations between the Heart STG canculated by JN Entimall: 21.000 tlosscope for the STG data set and Proctor Harvey data set are 0.96 and 0.91, respectively.
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41,30200 p 5 / 5
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DEPARTMENT OF HEALTH & HUMAN SERVICES
Image /page/6/Picture/2 description: The image shows the logo for the U.S. Department of Health and Human Services. The logo features a stylized eagle head with three lines forming the head and neck. The words "DEPARTMENT OF HEALTH AND HUMAN SERVICES. USA" are arranged in a circular pattern around the eagle head.
DEC 2 3 2005
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Stethographics, Inc. c/o Ms. Rozanne Paciej Director, Regulatory Affairs Quality Assurance 1153 Centre Street Boston, MA 02130
Re: K052283
Trade Name: Stethographics Heart STG System Regulation Number: 21 CFR 870.1875 Regulation Name: Stethoscope Regulatory Class: Class II (two) Product Code: DQD Dated: November 14, 2005 Received: November 22, 2005
Dear Ms. Paciej:
We have reviewed your Section 510(k) premarket notification of intent to market the device We have reviewed your Section 510(x) prematics is substantially equivalent (for the indications referenced above and have determined the actived predicate devices marketed in interstate for use stated in the encrosule) to regally manced promoted in vice Amendments, or to
commerce prior to May 28, 1976, the enactment date of the Federal Food. Drug commerce prior to May 28, 1970, the chacance with the provisions of the Federal Food, Drug, devices that have been reculted in accordance while approval application (PMA).
and Cosmetic Act (Act) that do not require approval of a providions of the Act. The and Cosment Act (Act) that do not require approvate of the general controls of the Act. The You may, therefore, market the device, subject to tits gonto for annual registration, listing of the and general controls provisions of the Free merals required.
devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it If your device is classified (SCC above) the entile is a control stars and control device can
may be subject to such additional controls. Existing major regulations EDA mov may be subject to such additional controllar antitudes of the 21, Parts 800 to 898. In addition, FDA may be found in the Code of Poderal Regaring your device in the Federal Register.
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Page 2 – Ms. Rozanne Paciej
Please be advised that FDA's issuance of a substantial equivalence determination does not mean Please be advised that FDA s issualice of a subscription with other requirements of the Act
that FDA has made a determination that your device complies . You must that FDA has made a decidination that your de received by other Federal agencies. You musti of any Federal statutes and regulations daminities, but not limited to: registration and listing (21)
comply with all the Act's requirements, including, but not limited to: r comply with all the Act s requirements, morams, connective requirements as set CFR Part 807); labeling (21 CFR Part 807); good if applicable, the electronic
forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electroni form in the quality systems (QD) regulation (Sections 531-542 of the Act); 21 CFR 1000-1050.
product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1 product radiation control provisions (Decions of the as described in your Section 5 (0(k)
This letter will allow you to begin marketing your device as described in your high I his letter will anow you to begin manceing your and equivalence of your device to a legally premarket notification. The PDA multing of substantial equal and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Patt 801), please if you desire specific advice for your ac not one one one not the regulation entitled. comact the Office of Complanes at (210) = 15 = 16 = 16 = 1 = 1 = 1 = 1 = 1 = 1 = 5 = = \$ Small Misoraliung by reference to promantovitibilities under the Act from the Division of Small other general information on your responsibilities and its toll-free number (800) 638-204 or btrail Manufacturers, International and October http://www.fda.gov/cdrl/industry/support/index.html.
Sincerely yours,
A. Ui Feinter for
Bram D. Zuckerman, M.D.
Director Division of Cardiovascular Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known): _ KOS 2283
K052283
Device Name: Stethographics Heart STG System
Indications for Use:
The Stethographics Heart STG System, is an electronic auscultatory device, intended to provide support to the physician in the evaluation of heart sounds in patients.
The product will acquire and record the acoustic signals of the heart and analyze these signals. The analysis procedure will identify specific heart sounds that may be present. Identified sounds include S1, S2, and suspected systolic murmurs.
The device is indicated for use in the clinical setting, by a physician or by trained personnel who are acting on the orders of a licensed physician. It in not intended as a sole means of diagnosis.
The interpretations of heart sounds offered by the Heart STG System are only significant when used in conjunction with physician over-read as well as consideration of all relevant patient data.
Prescription Use XXX (Part 21 CFR 801 Subpart D)
AND/OR
Over-The-Counter Use _________________________________________________________________________________________________________________________________________________________ (21 CFR 801 Subpart C)
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE OF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
A.M. Mcclellan for Brian D. Zuckerman, (MD)
(Division Sign-Off)
Division of Cardiovascular Devices
510(k) Number
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