GE Marquette Responder 3000, Руководство оператора

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12-Lead ECG Analysis Program (12SL
TM
)
46 Marquette Responder® 3000 227 490 02-C
8 12-Lead ECG Analysis Program (12SL
TM
)
Introduction
Overview
The first human electrocardiogram was taken over
a hundred years ago, and computerized electrocar-
diography has been in existence since the late
1950s.
The pioneers of this technology had motivations
which could mimic human activity to the basic
requirement of efficiently recording artifact free
tracings.
Computerization has resulted in two practical
advantages for the overreading physician. First, the
computer can serve as an additional expert
opinion. Second, cardiologists have found that it is
possible for them to overread computer analyzed
tracings in half the time required for conventional,
non-analyzed ECGs.
The computer, therefore, is not only used to
efficiently record, store, transmit, and present the
ECG; but it is also used to assist the physician in
overreading an ECG.
It should be made clear that a computerized
analysis is not a substitute for human interpreta-
tion. There are two reasons for this. First,
statements of accuracy need to be viewed from a
statistical perspective. Although accuracy levels
may be high, outliers can and will exist. Second, a
computer does not have the ability to include the
entire clinical picture of the patient. A person with
organic heart disease can exhibit an ECG within
normal limits. Conversely, a normal individual can
have an abnormal appearing ECG. The ECG,
therefore, must always be reviewed in light of the
surrounding clinical circumstances.
A program's accuracy is directly dependent upon
the quality of the signal it acquires. In 1979,
Marquette Hellige introduced an electrocardio-
graph that simultaneously acquired all of the leads
from the 12-lead electrocardiogram. Prior to this
time, all commercially available electrocardio-
graphs could only acquire 3 leads at a time.
Simultaneous recording was adopted so that the
computer could use all signals from all 12 leads to
properly detect and classify each QRS complex.