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B40/B20 Patient Monitor
11-22
Description of the ST segment measurement algorithm
The ST segment begins at the point where the QRS ends (J point). Diagnostic criteria of ST
segment changes are measured at 60 ms after the J point. For monitoring purposes it is
important to keep the measurement point fixed during monitoring to notice the ST changes on
the respective trends.
The sophisticated algorithms of monitor search the J and isoelectric (ISO) points. The system
learns the ECG and stores the reference QRST complex. The algorithm sets the ISO and J points.
Due to the large variation with QRST complexes the user has possibility to adjust the ST
measurement points manually. The QRS analysis classifies each beat by using several criteria
and rejects distorted complexes from the ST calculation.
NOTE: The ST algorithm has been tested for accuracy of the ST segment data
.
The significance
of the ST segment changes needs to be determined by a physician.
Summary of Contents for B20
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Page 16: ...B40 B20 Patient Monitor xii ...
Page 17: ...1 Introduction ...
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Page 27: ...2 System description ...
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Page 58: ...B40 B20 Patient Monitor 2 30 ...
Page 59: ...3 Installation ...
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Page 69: ...4 Monitoring basic ...
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Page 79: ...5 Alarms ...
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Page 102: ...B40 B20 Patient Monitor 5 22 ...
Page 103: ...6 Monitor setup ...
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Page 123: ...7 Trends ...
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Page 140: ...B40 B20 Patient Monitor 7 16 ...
Page 141: ...8 Print and record ...
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Page 153: ...9 Cleaning and care ...
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Page 163: ...10 Troubleshooting ...
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Page 181: ...11 ECG ...
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Page 205: ...12 Impedance respiration ...
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Page 215: ...13 Pulse oximetry ...
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Page 232: ...B40 B20 Patient Monitor 13 16 ...
Page 233: ...14 Non invasive blood pressure ...
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Page 248: ...B40 B20 Patient Monitor 14 14 ...
Page 249: ...15 Invasive blood pressure ...
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Page 261: ...16 Temperature ...
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Page 267: ...17 Airway gas ...
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Page 293: ...18 Entropy ...
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Page 316: ...Abbreviations A 12 ...
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