Polysystem-EP/L
Polysystem-EP/L
System for noninvasive transesophageal electrophysiological studies
The system is designed for noninvasive electrophysiological studies using esophageal electrography and transesophageal cardiac pacing, as well as atrial-pacing stress tests to detect myocardial ischemia.
System configuration
- Specialized portable ECG and esophageal-lead recording unit
Lead cable, ECG electrode set, esophageal probes and software for transesophageal electrophysiological studies - Windows Embedded operating system
Designed to support the performance and security of devices requiring a high level of reliability
- Specialized fault-tolerant industrial computer
Supports uninterrupted long-term unattended operation - Medical-grade power supply
Supports compliance with medical electrical-safety and radio-frequency interference requirements - Programmable cardiac stimulator
Cardiac stimulator
The system lets users program and modify stimulus pulse sequences and parameters during operation. The stimulator can be started and controlled in manual or automatic mode.
Electrical stimulation is programd by entering the required values in dedicated blocks and setting the sequence in which the blocks are activated. The following parameters can be programd manually in each block: voltage, pulse duration, coupling interval to the R wave or previous stimulus, pause after a pulse sequence, pulse repetition period or frequency, and the number of pulses or duration of a timed sequence.
The coupling interval can be changed manually or in automatic decrement and increment modes, with a minimum step of 1 ms and display of the current interval. Stimulus markers are shown on screen during pacing.
Pause and Repeat functions are provided.
The stimulator supports the principal cardiac pacing modes used in clinical electrophysiological studies.
Recording
The system simultaneously records surface ECG in standard leads and esophageal electrograms. The acquired data is displayed on the PC in real time, with 4 trace speeds and a user-selected number of channels.
Filtered waveforms are displayed in real time. Users can select 4 different colors from a palette of 256 for the displayed curves and stimulus markers. The current heart rate and study time remain visible. These data can be recorded continuously to the HDD throughout the study.
During operation, users can "freeze" the waveforms for closer review and measurement without interrupting data acquisition or recording. A distinguishing feature of the system is its ability to record esophageal electrograms from the same electrodes used for electrical stimulation.
Programmable digital filters are used to display the acquired esophageal electrograms. Users define the filter passband. The digital filters operate both in real time, so the moving waveforms already show filtered signals, and during retrospective analysis.
The system can also be supplied with software for automating transesophageal electrophysiological studies, including determination of cardiac rhythm parameters, pacing threshold, sinoatrial conduction time, sinus node recovery time, Wenckebach point and refractory period of the atrioventricular conduction system, as well as assessment of ST-segment and heart-rate dynamics.
Analysis
ECG data recorded during the study is presented as a heart-rate trend and a compressed full disclosure recording of one selected channel. These views help users locate sections of the recording for detailed review.
ECG recordings are displayed as native multichannel data at the selected scale, with smooth or stepwise navigation. Electrical-stimulus markers and parameters are shown. Dedicated cursors support high-precision measurement of time intervals and signal amplitudes.
During review, users can filter any recorded channel or combination of channels by selected frequencies without altering the native archived recording.
Data storage
The system includes a dedicated database for storing, analyzing and organizing data acquired during studies.
