Noninvasive Electrophysiological Study

• programmable cardiac stimulator
• fault-tolerant dedicated (industrial) computer, which provides no-break operation in unattended mode during long time
• medical power unite, which provides conformity to medical standards of electrical safety
• Windows Embedded operating system, that is specially designed to provide productivity and safety of devices with higher reliability level

Recording

The system allows 12 lead ECG and esophageal electrogram recording simultaneously. Filtered oscillograms are performed on the screen in real time. 4 different colors (out of 256) can be set by the user for curves, as well as stimuli for markers. Current HR and time are always displayed. Specified data can be constantly logged on the HDD during whole measurement at a set number of channels.

During measurement the user can "Stop" oscillogram movements for more detail processing and measurements while data recording continues. The notable feature of the system is the ability of recording esophageal electrogram from electrodes concurrently with cardiac stimulation.

Programmable digital filter is used to view recorded esophageal electrograms. The range of gating frequency is set by the user. Digital filters work both in real time and during analysis. At that in real time working the ocillograms that move on the screen are filtered signals.

Advanced options

Additionally the system can be supplied with a set of programs for automation of noninvasive EP (defining of HR parameters, threshold of stimulation, time of sino-atrial conduction, time of functional recovery of sinus node, Wenckebach point, refractory period of atrioventricular conducting system, estimation of ST-segment and HR dynamics and etc.)

Cardiac stimulator

The system allows programming and changing of series and parameters of stimulator impulses during operation. The stimulator is started and operated both in manual and automatic modes. "Pause" and "Repeat" functions are available. The following can be set manually: voltage, impulse length, linkage interval (with R-waves or previous stimulus), pause after series of impulses, period of impulse following and frequency, number of impulses in a series or the length of the series in time. The coupling interval can be changed in manual mode or in automatic mode ("decrement ", "increment" with minimal step 1 ms) with indication of current interval.

Stimulator allows programming the main pace protocols, which are used in clinic electrophysiological studies. Markers of stimulus are viewed on the screen while stimulation.

Analysis

Recorded during the ECG measurement data is performed in HR trend and full compression record (full disclosure) of the one of the chosen channels by which the search of necessary part of the record was realized for further detailed processing.

ECG viewing is performed in multichannel image of native record in a selected scale with possibility of smooth or discrete shifting along it. Markers and parameters of the electrostimulus are set. User can measure of temporary intervals and amplitude. During viewing any of the recorded channels can be filtered at user set frequency without changes in native record on the HDD.

Database running

System is based on a special database which allows saving and systematizing of records and also results of its analyzing. HHD of the computer is used for operative data saving, for long-term storage of large data CD or DVD disks are used.