![]() There was poor agreement between expired tidal volume measured by the ventilator and the CO 2SMO monitor. The calculated value of \( P_ \) measured by VCAP and corrected and uncorrected values measured in expired collected gas. Single-breath CO 2 waveform areas under the curve were computed automatically by software to calculate physiological dead space. In total, 168 paired readings were taken. Dead space was calculated simultaneously using VCAP (CO 2SMO) and the Bohr–Enghoff equation. Prospective observational study of 48 mechanically ventilated adults ICU patients. ![]() Few studies have been conducted to directly compare dead space measured by VCAP and the DB method in critically unwell adults. Volumetric capnography (VCAP) offers a relatively simple solution to calculating dead space. These factors make this method impractical in the critical care setting. Physiological dead space should be a routine measurement in ventilated patients but measuring dead space using the Douglas bag (DB) method is cumbersome and requires corrections for compressed ventilator gas.
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