A Distributed Microprocessor Respiratory Intensive Care Monitoring System with Mass Spectrometer, Proximal Flowmeter, and Airway Pressure Transducer
Monitoring ventilated patients in the respiratory intensive care unit (RICU) has advanced less rapidly than monitoring in the coronary care unit (CCU). Transducers for analyzing the concentration of gases ventilating the lungs have been unreliable for long term monitoring or have been prohibitively expensive. Flowmeters sufficiently robust and trouble free for use in the proximal airway have not been available. Tidal volume and ventilation monitoring is attempted only occasionally at the exhalation valve of the ventilator. Some ventilators incorporate one or more flowmeters distal to the patient, thus the compressed gas volume is not measured directly and actual tidal lung volumes are frequently over estimated. Pressure monitoring at the proximal airway has been relatively easy — a number of ventilators feature continuous pressure monitoring and a variety of devices are available for airway pressure monitoring with low and/or high pressure alarms.
KeywordsTidal Volume Dead Space Lung Mechanic Alveolar Ventilation Proximal Airway
Unable to display preview. Download preview PDF.
- 1.J.J. Osborn, Monitoring Respiratory Function, Critical Care Medicine, Vol. 2, No. 217–220 July-August 1974.Google Scholar
- 2.B.R. Riker, and B. Haberman, Expired gas monitoring by Mass Spectrometry in a respiratory intensive care unit, Critical Care Medicine, Vol. 4, No. 5, 223–229, September-October, 1976.Google Scholar
- 4.B. Jonson, L. Nordstrom, and S.G. Olsson, Monitoring of Ventilation and Lung Mechanics during automatic ventilation, A new device, Bull Physiopathol Resp 11: 729, 1975.Google Scholar
- 5.R.A. Smith, Ventilatory support for ARDS, Respiratory Therapy, Vol. 11, No. 3, 21, 30, May-June 1981.Google Scholar
- 6.H. Enghoff, Volumen Inefficax, Bemerkungen Zur Frage des Schadlichen Raumes, Uppsala Lak for Forh 44: 191, 1938.Google Scholar
- 7.K.C. Craig, and D.J. Pierson, Expired gas collection for dead space calculations: A comparison of two methods, Respiratory Care, Vol. 24, No. 5, 435–437, May, 1979.Google Scholar