(85 days)
Not Found
No
The document explicitly states that the instrument is "not intended to interpret any exercise test results" and does not mention any AI or ML technologies. The "Alternans Report Classifier software" is described as providing a "preliminary assessment," which does not necessarily imply AI/ML.
No.
The device is used for diagnostic purposes, specifically for assessing cardiac response to exercise and identifying potential cardiac issues. It aids in diagnosis and assessment, rather than providing direct therapy.
Yes
The device is designed to assess a patient's cardiac response to exercise and aid in the diagnosis of coronary artery disease, determine physical performance characteristics, and assess post-myocardial infarction. It also measures Microvolt T-Wave Alternans to predict increased risk of a cardiac event, which is explicitly a diagnostic purpose.
No
The device description explicitly states it is a "computer based electrocardiograph (ECG) exercise stress test system" and mentions "automatic or manual control of the exercise equipment," indicating it includes hardware components beyond just software.
Based on the provided text, this device is not an In Vitro Diagnostic (IVD).
Here's why:
- IVDs analyze samples taken from the human body (like blood, urine, tissue). The QUEST device directly measures electrical signals from the patient's body (ECG).
- The intended use describes a diagnostic process based on physiological response to exercise. It's about monitoring and assessing the patient's cardiac function in vivo during stress, not analyzing a sample in vitro.
- The device description focuses on real-time ECG waveforms and calculations. This is consistent with a device that interacts directly with the patient's body.
The device is clearly an in vivo diagnostic device used for exercise stress testing.
N/A
Intended Use / Indications for Use
QUEST is designed to provide ECG information and data to qualified medical personnel for the purpose of assessing the patient's cardiac response to exercise. It is to be used in hospitals, clinics, or physician offices by a qualified and licensed physician, or by trained staff under the direct supervision of that physician.
Stress-test or exercise electrocardiography is used a) when the diagnosis of coronary artery disease is suspected, b) to determine the physical performance characteristics of a patient, c) for post myocardial infarction assessment, or d) for cardiac rehabilitation. The test involves the recording of the electrocardiogram during dynamic or, occasionally, isometric exercise. Disease assessment is most prominent in adult patients. The diagnostic value of exercise testing primarily concerns either ST segment depression present in myocardial ischemia, or elevation seen in infarcts (in comparison to P-Q segment as the isoelectric line). In addition, it is important to consider the patient's blood pressure response and physical symptoms.
This instrument is not intended to interpret any exercise test results but is to be used as an aid for the physician to determine normal or abnormal response of the patient to exercise.
QUEST is not intended for long term monitoring of patient ECG signals. Specifically, it does not substitute for recommended cardiac monitoring devices recognized by AAMI EC13, especially in the area of alarms.
This instrument (OUEST) provides a method of collecting a multichannel ECG for dynamic evaluation of exercise performed by the patient. In order to provoke myocardial ischemia, the degree of stress must be sufficient to exceed the critical level of the patient's myocardial oxygen demand. The specificity of ST changes in identification of ischemia increases with the degree, time of onset, and when more than one electrocardiograph lead exhibits the abnormality. These patients can walk on a treadmill in which the speed and elevation can be adjusted (automatically or manually) to suit a variety of graded exercise protocols, or pedal an electronically braked bicycle ergometer. If the test subject is unable to walk, isometric exercise can be performed using a handheld dynamometer, or injecting the patient with heart rate stimulants to stress the myocardial system and then use this instrument's monitoring capability. It is operated from a standing position with design consideration given to ergonomic heights, viewing access of the information display, and control functions. It is cart based, with wheels, to provide easy movement. It can be used in conjunction with echocardiography, nuclear imaging, or pulmonary gas exchange equipment by providing ECG trigger signals and/or treadmill speed and grade levels.
This instrument can also serve as an adult resting interpretive electrocardiograph with the addition of Burdick's resting interpretive program.
The OUEST with T-Wave Alternans Option is intended for the measurement of Microvolt T-Wave Alternans* at rest and during ECG stress testing.
The presence of Microvolt T-Wave Alternans as measured by the QUEST with T-Wave Alternans Option in patients with known or suspected ventricular tachyarrhythmia, or who are at risk of ventricular tachyarrhythmia predicts increased risk of a cardiac event (ventricular tachyarrhythmia or sudden death).
The OUEST with T-Wave Alternans Option should be used only as an adjunct to clinical history and the results of other non-invasive and/or invasive tests. The interpretive results of the Alternans Report Classifier software should be reviewed by a qualified physician.
The predictive value of T-Wave Alternans for cardiac events has not been established in patients with active, untreated ischemia.
*Microvolt T-Wave Alternans is defined as T-wave alternans which a) is measured from high-resolution multi-segment sensors, b) is present in leads X, Y, Z, VM, or two adjacent precordial leads, c) is at the level of 1.9 microvolts after signal optimization and subtraction of the background noise level, d) is at least three standard deviations greater than the background noise level, e) has an onset heart rate of below 110 beats per minute, and f) is sustained for all heart rates above the onset heart rate.
Product codes (comma separated list FDA assigned to the subject device)
74DSI
Device Description
The Quest Exercise Stress System is a computer based electrocardiograph (ECG) exercise stress test system designed for use with both treadmill and bicvcle eraometer exercise protocols. The Quest Exercise stress system provides real time ECG waveforms and calculations to qualified medical personnel while providing automatic or manual control of the exercise equipment.
The Quest Exercise Stress System with T-wave alternans option provides measurement of T-wave alternans measurement in addition to the functions of the ECG. The Alternans Report Classifier software used with the Twave alternans option provides a preliminary assessment of the alternans report data.
Mentions image processing
Not Found
Mentions AI, DNN, or ML
Not Found
Input Imaging Modality
ECG
Anatomical Site
Not Found
Indicated Patient Age Range
adult patients
Intended User / Care Setting
qualified medical personnel, hospitals, clinics, or physician offices by a qualified and licensed physician, or by trained staff under the direct supervision of that physician.
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
Not Found
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
Not Found
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
Not Found
Predicate Device(s): If the device was cleared using the 510(k) pathway, identify the Predicate Device(s) K/DEN number used to claim substantial equivalence and list them here in a comma separated list exactly as they appear in the text. List the primary predicate first in the list.
Reference Device(s): Identify the Reference Device(s) K/DEN number and list them here in a comma separated list exactly as they appear in the text.
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only (e.g. presence / absence, what scope was granted / cleared under the PCCP, any restrictions, etc).
Not Found
§ 870.1025 Arrhythmia detector and alarm (including ST-segment measurement and alarm).
(a)
Identification. The arrhythmia detector and alarm device monitors an electrocardiogram and is designed to produce a visible or audible signal or alarm when atrial or ventricular arrhythmia, such as premature contraction or ventricular fibrillation, occurs.(b)
Classification. Class II (special controls). The guidance document entitled “Class II Special Controls Guidance Document: Arrhythmia Detector and Alarm” will serve as the special control. See § 870.1 for the availability of this guidance document.
0
Ko21097
Image /page/0/Picture/1 description: The image shows the logo for Spacelabs Burdick. The word "Spacelabs" is in a bold, sans-serif font, with a curved line above it. Below "Spacelabs" is the word "burdick" in a smaller, sans-serif font. The logo is black and white.
JUN 2 8 2002
Deerfield. WI 5 608-764-1919
510(k) Summary
| Submitter: | Spacelabs Burdick, Inc.
500 Burdick Parkway
Deerfield, WI 53531
Phone: (608) 764-1919 |
|---------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------|
| Contact: | Edward M. Basile
King & Spalding
1730 Pennsylvania Avenue
Washington, DC 20006
Telephone: 202-626-2996
FAX: 202-626-3737 |
| Date of Summary: | April 4, 2002 |
| Device Name
Proprietary:
Common: | Spacelabs Burdick Quest Exercise Stress System
Electrocardiograph/Arrhythmia Detector |
| Device Classification
Classification:
Product Code:
Classification:
Panel | Class III
74DSI
Cardiovascular |
| Predicate Device: | Quest Exercise Stress System (K011339) |
Description of: Addition of Cambridge Heart's Alternans the Change Report Classifier software
1
021097
General Device Description
The Quest Exercise Stress System is a computer based electrocardiograph (ECG) exercise stress test system designed for use with both treadmill and bicvcle eraometer exercise protocols. The Quest Exercise stress system provides real time ECG waveforms and calculations to qualified medical personnel while providing automatic or manual control of the exercise equipment.
The Quest Exercise Stress System with T-wave alternans option provides measurement of T-wave alternans measurement in addition to the functions of the ECG. The Alternans Report Classifier software used with the Twave alternans option provides a preliminary assessment of the alternans report data.
Indication for Use and Intended Population
QUEST is designed to provide ECG information and data to qualified medical personnel for the purpose of assessing the patient's cardiac response to exercise. It is to be used in hospitals, clinics, or physician offices by a qualified and licensed physician, or by trained staff under the direct supervision of that physician.
Stress-test or exercise electrocardioaraphy is used a) when the diagnosis of coronary artery disease is suspected, b) to determine the physical performance characteristics of a patient, c) for post myocardial infarction assessment, or d) for cardiac rehabilitation. The test involves the recording of the electrocardiogram during dynamic or, occasionally, isometric exercise. Disease assessment is most prominent in adult patients. The diagnostic value of exercise testing primarily concerns either ST segment depression present in myocardial ischemia, or elevation seen in infarcts (in comparison to P-Q segment as the isoelectic line). In addition it is important to consider the patient's blood pressure response and physical symptoms.
This instrument is not intended to interpret any exercise test results but is to be used as an aid for the physician to determine normal or abnormal response of the patient to exercise.
QUEST is not intended for long term monitoring of patient ECG signals. Specifically it does not substitute for recommended cardiac monitoring devices recognized by AAMI EC13 especially in the area of alarms.
This instrument (QUEST ) provides a method of collecting a multichannel ECG for dynamic evaluation of exercise performed by the patient. In order to provoke myocardial ischemia, the degree of stress must be sufficient to exceed the critical level of the patient's myocardial oxygen demand. The
Quest Exercise Stress System 510K Summary Page 2 of 11
2
specificity of ST changes in identification of ischemia increases with the degree, time of onset, and when more than one electrocardiograph lead exhibits the abnormality. These patients can walk on a treadmill in which the speed and elevation can be adjusted (automatically or manually) to suit a variety of graded exercise protocols, or pedal an electronically braked bicycle erqometer. If the test subject is unable to walk, isometric exercise can be performed using a handheld dynamometer, or injecting the patient with heart rate stimulants to stress the myocardial system and then use this instrument's monitoring capability. It is operated from a standing position with design consideration given to ergonomic heights, viewing access of the informational display, and control functions. It is cart based, with wheels, to provide easy movement. It can be used in conjunction with echocardiography, nuclear imaging, or pulmonary gas exchange equipment by providing ECG trigger signals and / or treadmill speed and grade levels.
This instrument can also serve as an adult resting interpretive electrocardiograph with the addition of Burdick's resting interpretive program.
The Quest with T-Wave Alternans Option is intended for the measurement of Microvolt T-Wave Alternans* at rest and during ECG stress testing.
The presence of Microvolt T-wave Alternans as measured by the Quest with T-Wave Alternans Option in patients with known, suspected or at risk of ventricular tachyarrhythmia predicts increased risk of a cardiac event (ventricular tachyarrhythmia or sudden death).
The Quest with T-Wave Alternans Option should be used only as an adjunct to clinical history and the results of other non-invasive and/or invasive tests. The interpretive results of the Alternans Report Classifier software should be reviewed by a qualified physician.
The predictive value of T-Wave Alternans for cardiac events has not been established in patients with active, untreated ischemia.
*Microvolt T-wave Alternans is defined as T-wave alternans which (a) is measured from high-resolution multi-segment sensors, (b) is present in leads X, Y, Z, VM or two adjacent precordial leads, (c) is at the level of 1.9 microvolts after signal optimization and subtraction of the background noise level, (d) is at least three standard deviations greater than the background noise level, (e) has an onset heart rate of below 110 beats per minute, and (f) is sustained for all heart rates above the onset heart rate.
Detailed Device Description
The Quest Exercise Stress System simultaneously records and stores a standard 12 lead or 15 lead ECG; a selection of 3, 4, 6, or 12 channels are displayed in real time. ECG recordings may be output to the printer or stored
3
on disk. The Quest Exercise Stress System controls resting and exercise stages of stress tests conducted according to Bruce, modified Bruce. Naughton, Sub-Maximal, Astrand and other protocols. The Physician may also customize a protocol according to his or her preference.
The Quest Exercise Stress System computes measurements of ST segment slope and level continuously during testing, and displays selected real time 3. 4. 6. or 12 lead (operator selected) ECG traces as well as 12 median beat recordings with optional superimposed median resting beat for reference. All ECG data are provided for evaluation and interpretation by a qualified physician.
The Quest Exercise Stress System w/ Alternans option also computes Twave alternans (TWA) at rest and during physiological stress. The Alternans Report Classifier software provides a preliminary assessment of the alternans report data. The presence of T-wave alternans is thought to be predicative of increased susceptibility to ventricular arrhythmias.
Device Specifications
PATIENT MODULE: ECG AMPLIFIER and LEADS Frequency Response: 0.05 to 150 Hz Notch Filter: 50/60 or OFF, user selectable Patient Isolation: Meets AAMI ES1, IEC class CF Defib Protection: Protected to 360 Joules per AAMI EC11 Input Impedance: >20 megohms Common Mode Rejection: 140 dB (minimum) at 60 Hz Electrode Offset Tolerance: ± 300 mV System Noise: 20 programmable, >30 stages each with warm-up and recovery
Display Timers: Warm-up, Exercise Test Time, Stage Time, and Recovery Time
ENVIRONMENTAL CONDITIONS
Power: 115/230 VAC ± 10%, 50/60 Hz nominal 200W maximum Operating Temperature: 50° to 104° F (10° to 40°C) Humidity: 15 to 85% at 77° to 95°F (25° to 35°C) non-condensing Barometric Pressure: 425 to 775 mmHg Storage Temperature: - 5° to 130° F (-20° to 55°C) Storage Humidity: 0 to 95% System Leakage: Measurement of alternating beat to beat T-wave amplitude (alternans) requires the use of the Cambridge Heart Hi-Res ™ Electrode or Micro-V™ Electrode in conjunction with other Patient electrodes designed and approved specifically for use during exercise stress testing.
Detailed Device Description
Hardware Overview
Standard Hardware Components
| System Cart: | Mounts Computer, display, keyboard, and output devices. |
|---|---|
| Computer and Keyboard: | IBM compatible, including hard disk and interface cards. |
| Display: | 15-inch color monitor on swivel tilt bracket. |
| ECG Amplifier | The ECG Amplifier for Alternans measurement is embodied in the PM-3 patient module. Plugs into computer. |
| Printer: | Integrated thermal printer |
| Software: | Integrated System and diagnostic software is provided on hard disk. |
7
KOZID97
Standard Hardware Accessories
| Patient Cable: | Set of 10 to 14 detachable lead wires which
meet the requirements of 21CFR 898.12
and comply with IEC-601-1; 56.3c part 1.1,
General Requirements for Safety. |
|----------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| User Manuals: | Individual patient leads are either not
detachable, or user detachable with female
socket connections such that no conductive
surface is exposed when unconnected.
Operators manual supplied standard with
every system. Service manual supplied
upon request. Physicians Guide to T-Wave
Alternans processing supplied with T-wave
Alternans Option. T-wave alternans Course
Training Manual supplied in conjunction with
training course. |
Optional Configurations
There are fourteen (14) configurations for QUEST depending on the options purchased.
Configuration 1
The standard configuration which includes a custom cart containing a) the electronics chassis, b) a keyboard, c) treadmill control keys, d) thermal printer, e) a monitor with an integrated tilt, swivel and touchscreen, f) paper tray, g) storage basket, and h) Patient Module. It also includes a T600 Series treadmill connected to the electronics chassis. Both pieces of equipment have an AC input power cord. The lead wires of the Patient Module are fastened to disposable electrodes worn by the patient.
Configuration 2
Optionally the Configuration 1 treadmill can be replaced with a Bike Ergometer.
Configuration 3
Optionally the Burdick Adult Resting Interpretative ECG package can be added to any of the configurations. Its analysis capability is only for resting ECG and cannot be used for exercise data.
Configuration 4
Optionally an external FAX/modem unit can be added to any of the configurations. It is cabled to an RS232C serial cable (COM2) for serial data transmissions to a facsimile machine.
Quest Exercise Stress System 510K Summary Page 8 of 11
8
Configuration 5
Optionally an interface to the Burdick ECG data management system can be provided with any of the configurations. An RS232C serial cable (COM3) allows data exchange and storage of reports.
Configuration 6
Optionally a cable for a parallel printer can be added to any of the configurations. Its purpose is to provide another paper output for reports. A cable would be supplied.
Configuration 7
Optionally an external Non-Invasive Blood Pressure (NIBP) unit can be added to any of the configurations. Cables from one of the analog output ports (01, 02, 03, or 04) programmed to ECG or QRS 'pulse' and COM1 for a RS232C connection (if one exists) are used to communicate to that equipment.
Configuration 8
Optionally the Quest system is providing only an ECG trigger point to synchronize cardiac nuclear imaging equipment. Configuration 1 or Configuration 2 can include cables from QRS 'pulse' or one of the analog output ports (01, 02, 03, or 04) programmed to ECG, to trigger the imaging system. Typically a radio-opaque marker is injected into the patient during peak exercise so that blood perfusion can be evaluated by the imaging system. The ECG trigger point is used to synchronize the resultant image with ventricular contraction. The patients are generally not on a treadmill at that point
Configuration 9
A variation of Configuration 8 is to replace the bike or treadmill with a hand dynamometer (similar interface as a bicycle ergometer). The dynamometer could also be incorporated directly into the nuclear imaging equipment. The cable from Quest's QRS 'pulse' or one of the analog output ports (01, 02, 03, or 04) programmed to ECG, provides an ECG trigger signal while Quest's erqometer control (COM1) sets the workload of the dynamometer.
Configuration 10
Optionally the Quest system is providing only an ECG trigger point to synchronize the echocardiography equipment which evaluates heart wall abnormalities during ventricular contraction. Configuration 1 and Configuration 2 can include cables from QRS 'pulse' or one of the analog output ports (01, 02, 03, or 04) programmed to ECG, to trigger an echocardiography unit.
9
Confiquration 11
Optionally the Quest system can provide signals for gas exchange analysis equipment used during exercise testing. Configuration 1 or Configuration 2 can be used for cabling of 01 (treadmill speed), 02 (treadmill grade), and 03 (heart rate or ECG). The QRS 'pulse' can optionally be used for heart rate by some equipment manufacturers. These qas exchange systems perform all calculations and require Quest only to output workload values and heart rate during exercise.
Configuration 12
Quest can be used stand alone to facilitate drug infusion testing which does not require an exercise device. Quest is used solely to monitor the ECG, perform a "prompting" protocol, and allow the user to enter events. Note: no controls are available for drug delivery, they must be administered by the operator.
Configuration 13
Cardiac Rehabilitation typically utilizes Configurations 1, 2, 4, 5, 6, and/or 7.
Additional flexibility is provided for storage space by optionally offering a drawer or shelf mounted in the cart "frame".
Configuration 14
Quest can be configured with an alternans option, used to measure, provide interpretive results and record Microvolt T-wave alternans using optional software and PM-3 patient interface module. T-wave Alternans measurement to be useful in predicting ventricular tachyarrhythmias and sudden cardiac death. An alternans Operators Manual and Physicians Guide are provided with this configuration.
10
Software Overview
Capabilities and Functions
The Quest Exercise Stress System w/alternans option software is designed to:
- Input a standard 12 lead and 12 lead + XYZ ECG lead configuration .
- Display ECG traces on a CRT monitor .
- Record ECG traces on a laser printer .
- Detect QRS complexes and compute heart rate .
- Compute ECG median beats .
- Detect fiducial points on the ECG median beats .
- Compute ST and T wave measures (alternans) .
- Execute standard exercise protocols with Specified stages and stage . times.
Conclusion
Quest with the addition of the Alternans Report Classifier software is substantially equivalent to the currently marketed QUEST system.
11
DEPARTMENT OF HEALTH & HUMAN SERVICES
Public Health Service
Image /page/11/Picture/2 description: The image shows the logo for the Department of Health & Human Services - USA. The logo is circular, with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" arranged around the perimeter of the circle. Inside the circle is an abstract image of an eagle or bird, represented by three curved lines that suggest the shape of a bird's head and wings.
JUN 2 8 2002
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Spacelabs Medical, Inc. c/o Mr. Edward M. Basile King & Spalding 1730 Pennsylvania Avenue Washington, DC 20006
Re: K021097
Trade Name: Quest Exercise Stress System (QUEST) Regulation Name: Arrhythmia Detector and Alarm Regulation Number: 21 CFR 870.1025 Regulatory Class: Class III (three) Product Code: DSI Dated: April 4, 2002 Received: April 4, 2002
Dear Mr. Basile:
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. 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.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to such 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.
12
Page 2 - Mr. Edward M. Basile
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 requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (OS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 21 CFR Part 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4646. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address http://www.fda.gov/cdrh/dsma/dsmamain.html
Sincerely yours,
Donna-Bea Tillman, Ph.D. Acting Director Division of Cardiovascular and Respiratory Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
13
Indications for Use Statement
Page 1 of 2
510(k) Number (if known): __K02.1097
Device Name: Quest Exercise Stress System (QUEST)
Indications for Use:
OUEST is designed to provide ECG information and data to qualified medical personnel for the purpose of assessing the patient's cardiac response to exercise. It is to be used in hospitals, clinics, or physician offices by a qualified and licensed physician, or by trained staff under the direct supervision of that physician.
Stress-test or exercise electrocardiography is used a) when the diagnosis of coronary artery disease is suspected, b) to determine the physical performance characteristics of a patient, c) for post myocardial infarction assessment, or d) for cardiac rehabilitation. The test involves the recording of the electrocardiogram during dynamic or, occasionally, isometric exercise. Disease assessment is most prominent in adult patients. The diagnostic value of exercise testing primarily concerns either ST segment depression present in myocardial ischemia, or elevation seen in infarcts (in comparison to P-Q segment as the isoelectric line). In addition, it is important to consider the patient's blood pressure response and physical symptoms.
This instrument is not intended to interpret any exercise test results but is to be used as an aid for the physician to determine normal or abnormal response of the patient to exercise.
QUEST is not intended for long term monitoring of patient ECG signals. Specifically, it does not substitute for recommended cardiac monitoring devices recognized by AAMI EC13, especially in the area of alarms.
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
| (Division Sign-Off) | (Optional Format 3-10-98) |
|---|---|
| Division of Cardiovascular and Respiratory Devices |
| 510(k) Number | K021097 |
|---|---|
| --------------- | --------- |
14
This instrument (OUEST) provides a method of collecting a multichannel ECG for dynamic evaluation of exercise performed by the patient. In order to provoke myocardial ischemia, the degree of stress must be sufficient to exceed the critical level of the patient's myocardial oxygen demand. The specificity of ST changes in identification of ischemia increases with the degree , time of onset, and when more than one electrocardiograph lead exhibits the abnormality. These patients can walk on a treadmill in which the speed and elevation can be adjusted (automatically or manually) to suit a variety of graded exercise protocols, or pedal an electronically braked bicycle ergometer. If the test subject is unable to walk, isometric exercise can be performed using a handheld dynamometer, or injecting the patient with heart rate stimulants to stress the myocardial system and then use this instrument's monitoring capability. It is operated from a standing position with design consideration given to ergonomic heights, viewing access of the information display, and control functions. It is cart based, with wheels, to provide easy movement. It can be used in conjunction with echocardiography, nuclear imaging, or pulmonary gas exchange equipment by providing ECG trigger signals and/or treadmill speed and grade levels.
This instrument can also serve as an adult resting interpretive electrocardiograph with the addition of Burdick's resting interpretive program.
The OUEST with T-Wave Alternans Option is intended for the measurement of Microvolt T-Wave Alternans* at rest and during ECG stress testing.
The presence of Microvolt T-Wave Alternans as measured by the QUEST with T-Wave Alternans Option in patients with known or suspected ventricular tachyarrhythmia, or who are at risk of ventricular tachyarrhythmia predicts increased risk of a cardiac event (ventricular tachyarrhythmia or sudden death).
The OUEST with T-Wave Alternans Option should be used only as an adjunct to clinical history and the results of other non-invasive and/or invasive tests. The interpretive results of the Alternans Report Classifier software should be reviewed by a qualified physician.
The predictive value of T-Wave Alternans for cardiac events has not been established in patients with active, untreated ischemia.
*Microvolt T-Wave Alternans is defined as T-wave alternans which a) is measured from high-resolution multi-segment sensors, b) is present in leads X, Y, Z, VM, or two adjacent precordial leads, c) is at the level of 1.9 microvolts after signal optimization and subtraction of the background noise level, d) is at least three standard deviations greater than the background noise level, e) has an onset heart rate of below 110 beats per minute, and f) is sustained for all heart rates above the onset heart rate.