Wernerus H, Silva G, Wanner A
Respir Care. 1978 Sep;23(9):856-9.
Simple compact mechanical ventilation meters for bedside monitoring are in wide-spread use in this country. We investigated the accuracy of two such ventilation meters, the Drager Volumeter and the Wright Respirometer. Volume measurements on 16 units were made at fixed flow rates between 6 and 12 l/min. Both types of spirometer showed similar magnitudes and patterns of inaccuracy. For 14 used units, the mean deviation from the actual value was the smallest between the flow rates of 15 and 30 l/min, with a mean systematic underestimation of about 15 per cent and maximum variability among individual units (S.D. 10--12 per cent) at lower flow rates. Measurements at flow rates above 120 l/min were unsatisfactory due to locking of the ventilation meter mechanism. The single new Drager Volumeter tested was relatively accurate at all flow rates measured, whereas the single new Wright Respirometer tested showed inaccuracies comparable to the mean values of the used units. We conclude that these devices are satisfactory to monitor patients on continuous mechanical ventilation but may not be adequate for bedside spirometry.
用于床边监测的简易紧凑型机械通气计在我国广泛使用。我们研究了两种此类通气计——德尔格肺活量计和赖特呼吸计的准确性。在流速为6至12升/分钟之间的固定流速下，对16台设备进行了体积测量。两种类型的肺活量计显示出相似程度和模式的误差。对于14台使用过的设备，实际值的平均偏差在流速15至30升/分钟之间最小，在较低流速下平均系统低估约15%，且各台设备之间的最大变异性（标准差为10% - 12%）。由于通气计机制锁定，在流速高于120升/分钟时的测量结果不理想。测试的单个新德尔格肺活量计在所有测量流速下相对准确，而测试的单个新赖特呼吸计显示出与使用过的设备平均值相当的误差。我们得出结论，这些设备对于监测持续机械通气的患者是令人满意的，但可能不足以用于床边肺活量测定。
