Marquette models are similar in appearance to each other. The following information can be used for most Marquette machines. Note that each model may have slightly different features.

Five Electrocardiographic Instruments in One

Marquette Mac 15 ekg machines

Graphics (p.1-2) Graphics (p.1-3) Graphics (p.1-4)

The MAC 15--one of the most versatile instruments you'll ever own
The MAC 15 Electrocardiograph is a breakthrough in diagnostic versatility. It performs five important cardiac diagnostic tests:

• Computerized 12-lead Electrocardiography
• Signal-Averaged Electrocardiography
• Pacemaker Evaluation
• Vectorcardiography
• Full-Disclosure Holter

Test options may be added separately at any time. This flexible, cost-effective multifunction design offers substantial advantages over dedicated systems.

Computerized 12-lead electrocardiography
With fast, automatic operation, MAC 15 is the ideal instrument for handling your electrocardiographic
 workload. Simply attach the electrodes and push one button--MAC 15 does the rest. It collects 10 seconds 
of EKG data simultaneously from up to 15 leads, performs a complete analysis of waveform rhythm and 
morphology, and prints a full-size report. It also provides pediatric 15-lead reports and records 12 leads of 
real-time rhythm. The microprocessor-controlled thermal writer has only one moving part for high reliability 
and minimal maintenance.

Using hybrid micro-electronics, MAC 15 sets new standards for ECG signal quality. A compact acquisition module digitizes waveforms directly at the patient's side, providing unsurpassed fidelity in up to 15 leads of EKG data. Software-based, MAC 15 may be easily updated by simply replacing the program cartridge. This unique feature virtually eliminates obsolescence.

Marquette 12SLTM analysis
The MAC 15's computer-based analysis uses the same proven 12SL program once available only with room-sized EKG systems. Continually fine-tuned and updated by the world's leading electrocardiographers and our own dedicated research staff, the Marquette program has earned the trust of thousands of cardiologists worldwide. With the ability to analyze both adult and pediatric EKGs, the 12SL analysis program processes nearly one in every four EKGs taken in the United States.

Graphics (p.3-4)

Storage and communications
MAC 15 contains a floppy disk drive for storing EKG records in a convenient, transferable form. The MAC 15 can store as many as 150 complete EKGs on a single 3.5-inch floppy disk.  Stored EKGs may be overread and edited on the MAC 15 itself. In addition, when equipped with an optional modem, the MAC 15 can transmit EKGs to and receive them from another MAC cart or any of the more than 500 Marquette MUSE central processing centers around the world.


MAC 15's high-resolution writer provides up to 15 report formats including 15 leads of data and 12 leads of real-time rhythm.

Signal-averaged electrocardiography
In the standard electrocardiograph mode, the MAC 15 records the high-amplitude, low-frequency electrical signals of the cardiac cycle. When equipped with the Hi-ResTM option, the MAC 15 captures and records in the high-frequency, low-amplitude range. Research has shown that these signals contain a wealth of information not available in the conventional EKG. High-resolution, signal-averaged electrocardiography has the potential for many diagnostic applications. Currently its most significant clinical application is as a diagnostic test for identifying cardiac late potentials.

Cardiac late potentials 
Possible harbinger of sudden death
Cardiac late potentials are believed to be one of the leading indicators of life-threatening ventricular tachycardia, or sudden cardiac death. Recent evidence shows that if patients with late potentials can be identified, their risk of sudden death can be significantly reduced with available therapeutic measures.

Now with the Hi-Res option, you can perform late potential analysis quickly and at the patient's bedside. More importantly you can perform late potential analysis without expensive dedicated equipment.

Graphics (p.4-4)

Full disclosure of the template data provides noise measurements and permits user selection of "seed" beat and correlation threshold before signal averaging.

 

 

 

 

 

Easy operation
The MAC 15 is extremely easy to use as a late potential analyzer.  Simply apply the electrodes to the patient, then select the number of QRS complexes or noise level to be used in the averaging process. The MAC 15 automatically and precisely aligns and averages eight seconds of waveforms to produce a template. The "seed" beat used for template generation is user-selectable.  After template generation, the MAC 15 automatically collects QRS complexes for signal averaging. Strict integral quality control excludes any abnormal or noisy QRS complexes from the averaging process.

Final report in minutes
One of the distinctive benefits the MAC 15 offers as a late potential analyzer is that it combines data acquisition, signal processing, reanalysis, and report generating functions in one transportable cart. This means that you have the finished report in hand immediately after the study.

Multiple report formats
MAC 15 provides periodic plots during the averaging process, including unfiltered and filtered X, Y, and Z lead averaged complexes, vector magnitude, noise level, and standard deviation of the noise. These periodic plots provide both visual and numeric indication of data integrity during the averaging process. Standard and expanded final report formats are available for 25, 40, and 80 Hertz filter settings. The expanded report format also provides initial and terminal RMS voltage functions. In addition, the report includes calculations for standard and total QRS durations; high-frequency, low-amplitude signal duration; and RMS and mean voltages in the terminal 40 milliseconds.

Periodic plots provide both visual and numeric indications of data integrity during averaging.

Graphics (p.5-5)

Reanalysis
Any late potential report may be stored on a floppy disk for reanalysis on the MAC 15. QRS onset and offset markers and alterations in the terminal duration time are all user-selectable. New calculations are automatically made using the altered parameters.

The late potential analysis standard report includes full calculations immediately after signal averaging.

The expanded report permits visual inspection of filtered data for fragmentation. The RMS voltage function is also plotted.

Graphics (p.7-2)

Mid-QRS analysis
Signal-averaged data recorded on the MAC 15 may also be analyzed for reduced amplitude zones located in the mid-QRS. Envelopes for X, Y, and Z leads are automatically plotted along with the QRS durations, RMS voltage, and vector magnitude.

  Graphics (p.7-3)

The Mid-QRS report includes envelope plots for X, Y, and Z leads for visual inspection of reduced amplitude zones.

Advanced pacemaker analysis
With the pacemaker option, the MAC 15 does what no other electrocardiograph today is capable of doing. It becomes a portable instrument for analyzing the function of an implanted cardiac pacemaker. Using surface electrodes, the MAC 15 provides a computer analysis of single- and multi-chamber pacemakers, including calculations of interval, pulse width, amplitude, trailing-edge-to-leading-edge ratio and rate for both magnet and no-magnet modes. The MAC 15 can also be interfaced to a pacemaker receiving center for acquisition of remote pacemaker data.

Complete pacemaker evaluation at the push of a button
The MAC 15 performs a comprehensive pacemaker evaluation quickly and with minimal operator interaction. The pacemaker acquisition module samples incoming signals at an accelerated rate of 32,000 samples per second. Within minutes, the MAC 15 provides a final report prepared at both standard paper speed (25 mm/sec) and at a computer-generated speed of 3200 mm/sec (128 times real time) to give you a distortion-free record of pacemaker function. The pacemaker report can be stored on the MAC 15's floppy disk or transmitted to a MUSE EKG storage system for inclusion in a comprehensive pacemaker management program.

Graphics (p.9-4)Vectorcardiography
Vectorcardiography is well-known as a useful diagnostic and teaching tool when performed in conjunction with standard electrocardiography.  Using three simultaneously recorded orthogonal leads, the MAC 15 plots vector loops in the frontal, horizontal and sagittal planes. The vectorcardiogram provides a stereoscopic view of the heart's conduction activity

Clinically, vectorcardiography is considered to be a valuable complement in the study and diagnosis of inferior myocardial infarction in conjunction with or as discerned from left anterior fascicular block. Vector loops display initial forces and phase relationships sometimes not readily discernible in the scalar 12-lead EKG.

Fast, easy vectorcardiography
Using the MAC 15 as a vectorcardiograph is as easy as taking a standard EKG. Attach the electrodes and press one button. The MAC 15 immediately acquires 15 simultaneous leads and computer-analyzes the data for presentation in a 12-lead scalar report. Median X, Y, and Z waveforms and the vector loops you choose are plotted. Vector onset, offset and gain are easily changed to form complete or partial vector loops. The vectorcardiogram can be stored on the MAC 15's floppy disk or transmitted to a central facility for storage and later review.

Full-disclosure Holter
When combined with the optional SEERTM Solid State Holter Recorder, the MAC 15 provides comprehensive full-disclosure Holter reports. This cost-effective system makes Holter monitoring an attractive option for the hospital or office.

SEER is a completely solid-state Holter recorder with no mechanical parts to wear out or malfunction. Digital acquisition and storage provide unsurpassed frequency response. Monitoring flexibility is achieved through programmable lead groups. SEER can be programmed to record a unipolar chest lead and a traditional limb lead or two conventional bipolar Holter leads.

Graphics (p.10-5)Real-time analysis
While digitally recording 24 hours of diagnostic quality EKG signals in two channels, SEER also classifies and counts beats in real time with an on-board computer. This real-time processing makes the complete analysis available for immediate review. Test results, including a 24-hour full-disclosure EKG printout, are available in less than 10 minutes.

Simple operation
The MAC 15 guides the operator through each step and automatically converts SEER's digital information into a comprehensive report, including full-scale EKG strips, ST Segment Trend, ST Segment Event Scan, ST Segment Trend with Heart Rate, Ventricular Ectopy Trend, Ventricular Event Scan, Patient Episode Event Scan, and Hourly Summary Report.

Marquette Mac 15 ekg machines