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Impedance Pneumography (RESP)
Welch Allyn 140 Propaq Encore Reference Guide
Impedance Pneumography (RESP)
Impedance Pneumography (RESP) Specifications
Characteristic Specification
Display Characteristics
Sweep speed 3.13, 6.25, 12.5 mm/sec; user-selectable
Amplitude range 1x, 2x, 4x, 8x, 16x
Performance Characteristics
Excitation signal characteristics 65 µA RMS ±5% at 63.0 kHz pseudo sine wave
Sensing electrodes User selectable RA-LA or RA-LL
Base impedance (in addition to 1K
resistors in ECG cables)
100 to 1200 ohms is normal monitoring range, approx. 1200-1500
ohms range produces a “NOISY SIGNAL, CHECK ELECTRODES”
equipment alert. Above approx. 1500 ohms produces a “RESP FAULT,
LEAD FAIL” equipment alert. Thresholds are dependent on ECG cable
type.
Impedance dynamic range 20 ohms
Signal bandwidth after detection 0.06 Hz (single pole) to 3.2 Hz (2 pole)
Breath detection threshold 140 milliohms or 2x CVA, whichever is greater
Respiration rate range Adult/Ped: 0 (apnea), 2 to 150 breaths/min
Neonate: 0 (apnea), 3 to 150 breaths/min
Respiration rate accuracy ±2 breaths/min or ±2%, whichever is greater
Respitation rate source (RR) When CO
2
is active, CO
2
is the BR source. Otherwise, RESP from
ECG is the RR source.
Apnea alarm delay accuracy +1 second
Resolution 5 seconds
Apnea alarm delay settings Central apnea only - alarm delay is set by the user
Adult/Ped = 6, 10, 15, 20, 25, 30
Neonate = 6, 10, 15, 20 seconds
Cardiovascular artifact rejection
(CVA)
Presence of CVA is detected automatically. Breaths will be
picked in the presence of CVA unless the Breath Rate is within
5% of the Heart Rate or a sub-multiple of the heart rate.
Motion artifact rejection not rejected
Obstructive apnea not detected
Cardiovascular artifact rejection
(CVA)
Presence of CVA is detected automatically. Breaths will be
picked in the presence of CVA unless the Breath Rate is within
5% of the Heart Rate or a sub-multiple of the heart rate.
Motion artifact rejection not rejected
Obstructive apnea not detected