
ST S
ETUP
VF6
Infinity Vista
10-5
Isoelectric and ST Measuring Points
ST segment deviations are specified in terms of a displacement above or below the
isoelectric level. To calculate this displacement, the monitor compares the amplitudes
of the signal at two user-selectable measurement points in the patient’s QRS
waveform. One point is typically set at the isoelectric level on the waveform. The
other point is typically set within the ST segment of the waveform. The difference (in
millimeters or millivolts) between the amplitude of the isoelectric point and the
amplitude of the ST measurement point represents the ST deviation. The available
settings for each point are:
z
Isoelectric Point: from the start of the averaged ST complex to the Fiducial
point, in increments of 4 ms
z
ST Measurement Point: from the Fiducial point to the end of the averaged ST
complex, in increments of 4 ms
The default position for the isoelectric point is -28 milliseconds before the start of the
QRS complex, as measured along the horizontal (time) axis. The default position for
the ST measurement point is +80 milliseconds after the end of the QRS complex. The
starting and ending points for the QRS complex are determined by the QRS detection
algorithm.
In practice, however, the determination of the isoelectric and ST measurement points
must be made on the basis of a careful clinical evaluation. The ST display provides the
means for changing the isoelectric and ST measurement points in order to ensure an
accurate ST deviation measurement.
STEPS: Setting the Isoelectric and ST Measuring Points
1. Click on the
ST
parameter box.
2. Click on
ISO
. Two vertical lines, indicating the location of the ISO and the ST
measurement points, appear in the ST waveform channels.
.
3. With the rotary knob, move the position of the ISO point to the desired
location and click the knob. The corresponding value (in milliseconds) is
shown next to the ISO label.
4. Click on
ST
.
NOTE:
You should always check the position of the isoelectric and ST measurement
points before starting ST monitoring.
Содержание Infinity Vista
Страница 1: ...Instructions for Use Infinity Vista Infinity Patient Monitoring Series ...
Страница 2: ......
Страница 16: ...xiv Infinity Vista VF6 This page intentionally left blank ...
Страница 25: ...FRONT PANEL VF6 Infinity Vista 1 9 Front Panel 1 Fixed Keys 3 Power ON OFF Key 2 Rotary Knob ...
Страница 27: ...LEFT SIDE PANEL VF6 Infinity Vista 1 11 Left Side Panel 1 NBP Hose Connection 2 MULTIMED NEOMED Connection ...
Страница 58: ...2 16 Infinity Vista VF6 2 MONITOR SETUP This page intentionally left blank ...
Страница 66: ...3 8 Infinity Vista VF6 3 NETWORK APPLICATIONS This page intentionally left blank ...
Страница 80: ...4 14 Infinity Vista VF6 4 ADMISSION DISCHARGE TRANSFER This page intentionally left blank ...
Страница 106: ...5 26 Infinity Vista VF6 5 ALARMS AND MESSAGES This page intentionally left blank ...
Страница 107: ...6 Trends Overview 6 2 Trend Setup 6 2 Trend Graphs 6 3 Trend Table 6 5 Special Conditions and Codes 6 6 ...
Страница 114: ...6 8 Infinity Vista VF6 6 TRENDS This page intentionally left blank ...
Страница 166: ...10 8 Infinity Vista VF6 10 ST SEGMENT ANALYSIS This page intentionally left blank ...
Страница 204: ...13 12 Infinity Vista VF6 13 NON INVASIVE BLOOD PRESSURE This page intentionally left blank ...
Страница 213: ...15 Temperature Overview 15 2 Temperature Probes 15 2 Placing the Probe 15 2 ...
Страница 216: ...15 4 Infinity Vista VF6 15 TEMPERATURE This page intentionally left blank ...
Страница 250: ...C 18 Infinity Vista VF6 C DEFAULT SETTINGS AND BIOMEDICAL SUPPORT This page intentionally left blank ...
Страница 272: ...E 4 Infinity Vista VF6 E GLOSSARY This page intentionally left blank ...