B40/B20 Patient Monitor
12-2
Overview
Impedance respiration is measured across the thorax. When the patient is breathing or is
ventilated, the volume of air changes in the lungs, resulting in impedance changes between the
electrodes Respiration rate is calculated from these impedance changes, and a respiration
waveform is displayed on the monitor screen.
Figure 12-1 Impedance respiration measurement connector
Respiration detection
The respiration rate is the sum of the respirations that have exceeded the detection limit.
When starting respiration monitoring, the system “learns” the patient’s respiration pattern. The
respiration rate is calculated from impedance changes and a respiration waveform is
displayed. Respiration detection is not dependent on the size of the waveform. Size is for visual
purposes only.
The dotted lines present the zero line and the detection limit. The signal strength produced by a
respiration should thus exceed this minimum limit to be included in the respiration rate
calculation. Peaks within the grids are not calculated.
If the detection mode is
AUTO
, the grid lines present the minimum limits. The limits in use may
be larger. The RR value could include fewer respirations than indicated by the gridline.
NOTES:
•
Electrical devices, such as electrosurgery units and infrared heaters, that emit
electromagnetic disturbance may cause artifact or disable the respiration measurement
completely.
ECG and
impedance
respiration
connector
%
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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