![]() In studies using the lung model, the external deadspace represented 6% to 19% of the three tidal volume measurements. No significant difference was observed between measurements at the endotracheal tube and the expiratory port of the ventilator. The mean differences between minute ventilation measured by a metabolic monitor and minute ventilation measured by a pneumotachometer during controlled and synchronized intermittent mandatory ventilation were -0.04 +/- 0.61 (SD) L and 0.01 +/- 0.85 L, respectively. Alveolar ventilation and deadspace/tidal volume were calculated from Bohr's equation using end-tidal PCO2 for the alveolar PCO2 value. Measurement of a change in alveolar ventilation with three different tidal volume values in a single-compartment lung model using an added external deadspace. ![]() Simultaneous measurement of minute ventilation with a metabolic monitor and a pneumotachometer during controlled and synchronized intermittent mandatory ventilation in intensive care patients (n = 14). To validate the assessment of changes in alveolar ventilation and deadspace by indirect calorimetry.Īn open comparison of two methods using a criterion standard.
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