Introduction - HP PageWriter XL M1705B Service Manual

B
M1754A Signal Averaged ECG (SAECG) System
Introduction
The M1754A SAECG System enables the PageWriter XLi to detect,
display, and record high-frequency, low-amphtude (in the 2 to 20
microvolt range) ECG signals. The system can also detect mid-QRS
micro-potentials not detected by conventional SAECG filtering
techniques.
Note .I
$
The SAECG application requires the A.02.XX and higher (M1755A)
software. The SAECG Patient Module also acquires standard 12 lead
ECGs.
The SAECG application cannot reside on the cardiograph with the
VCG application.
The SAECG software uses an XYZ lead configuration to acquire
and average about 200 heartbeats. Averaging these beats allows the
physician to determine whether micro-potentials exist following the
QRS. These micro-potentials can indicate if the patient is at risk of
sudden death from ventricular arrhythmia.
The M1754A System consists of a software disk and a high-resolution
patient module. The system is easy to learn and use, and provides
full signal-averaging capability while eliminating the need for
dedicated SAECG equipment. The SAECG System continuously
displays real-time waveforms, averaged waveforms, and noise level
information on the XLi cardiograph's preview screen. The system
provides three user-selectable high-pass filters (25, 40, and SO HZ),
and allows you to select either number of beats or noise level as the
termination criteria. The system also allows you to adjust QRS
onset and offset in all filtered leads and final vector composite,
and automatically displays all QRS templates for verification. An
adjustable template window lets you perform P wave averaging and
HIS bundle analysis.
A patented BiSpec filter provides undistorted detection of potentials
and preserves data integrity and comparability. Measurements
made by the M1754A System correlate with acceptecl threshold
criteria. The system meets or exceeds all applicable ACC/AHA
recommendations for SAECG, and conforms to all applicable IEC,
VDE, UL, CSA, AHA, and AAMI ECG specifications.
M1754A Signal Averaged ECG (SAECG) System B-l