Continuous blood gas and pH measurement by the Beckman Chemistry Monitor Model 400 (BCM-400)

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MAINTENANCE of adequate respiratory function is of great importance in the critically ill patient.1, 2 The patient’s respiratory state is determined best from the blood gas values, which also are the basis for definitive treatment and the assessment of the effects of that treatment. Clinical trials in regard to the continuous measurement of blood gas have been reported,3–6 but from the viewpoint of the stability of the measured values, and of the long-term usage of the measuring device, the results are not entirely satisfactory.

Recently Beckman Instruments developed a continuous blood-gas monitoring device which has been reported to have considerable reliability in the continuous measurement of blood gas.7–9 We undertook a study of the Beck-man Chemistry Monitor, and our report describes the device and presents the results of experiments with the monitor during the last 14 months, together with our conclusions in regard to its use.

Materials and methods

The Beckman Chemistry Monitor Model 400 (BCM-400) is a continuous measuring and recording device for pH, pCO2 and pO2 values in blood both in vitro and in vivo (Fig. 1). It consists of four meters that display pH, pCO2, pO2, and temperature continuously as measured at the sensor block (Fig. 2). The values of the parameters are printed every 12 sec by a point recorder installed in the main part of the machine.

When continuous blood gas monitoring is to be performed, an arteriovenous loop must be created in the subject. To do this for an emergency case, two indwelling intravenous . . .



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