CALIBRATION OF RESPIRATORY INDUCTION PLETHYSMOGRAPHY (RESPITRACE) IN INFANTS

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Abstract
To determine whether the recently increased sensitivity of the variable frequency oscillator and the use of separate rib cage and abdominal transducers made calibration of the Respitrace system easier, 106 different calibration procedures were performed against a pneumotachygraph in 36 normal infants, 41 using 2 separate periods of quiet sleep, 49 using quiet and REM [rapid eye movement] sleep and 16 using 2 separate periods of REM sleep. When the calibration was done using 2 separate periods of quiet sleep, or using periods of quiet and REM sleep, a change of at least 50% in the amplitudes of both the abdominal and rib cage signals between the 2 sleep periods gave accurate calibration factors in 92%, compared with only 30% when the amplitude of either signal changed by < 50%. Calculation of the calibration factors can be done either by the least squares method or by solving simultaneous equations with no significant difference between the results.

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