Flow was monitored with a pneumotachometer
(Model 300L, ADInstruments Inc; Colorado Springs, Colorado).
The metabolic cart pneumotachometer
and gas analyzers were calibrated pretest and verified post-test using a 3 L syringe (Hans Rudolf Inc.
The minimum requirements for accuracy with a spirometer and a pneumotachometer
* Signal Requirement Volume (pneumotachometer
) Check daily with 3 l calibration syringe Range 0 - 8 l Accuracy ~3% or [+ or -] 50 ml, whichever is greater Resolution 25 ml Time Duration (for forced manoeuvre) 15 s Accuracy ~1% Flow Check quarterly with 1 l increments with calibrating syringe Range 0 - 15 l/s Accuracy ~3.
Computerized determination of pneumotachometer
characteristics using a calibrated syringe.
Tidal volumes for ventilated infants should be determined with a pneumotachometer
placed at the endotracheal tube.
Minute ventilation was measured using a pneumotachometer
(Jaeger, Viasys Healthcare, Hoechberg, Germany).
measures airflow through a mask that is placed over the patient's mouth and nose.
Fahlman used a custom-made portable device called a pneumotachometer
to measure the dolphin breaths.