| 摘要 |
<p>A tissue oxygen measuring system enabling the automatic and continuous measurement of diagnosing items including cerebral blood flow, cerebral blood volume, and response of cerebral blood volume to arterial carbon dioxide tension uses an oxygen measuring system (1) based on near infrared spectroscopy, a pulse oximeter (2), and an arterial carbon dioxide tension measuring unit (8). A gas blending unit (4) is employed before a ventilator (3) or face mask to control the ventilator so that a rate of a quantity of oxygen and/or a quantity of carbon dioxide to be blended in the air is changed at predetermined intervals. Trigger signals are produced in synchronism with the changes of the gaseous contents of the air, and parameters for computing information regarding the diagnosing items are measured in response to the trigger signals. With repetitive measurements of the parameters, the signal-to-noise ratio can be improved by averaging the data and erroneous data can easily be identified. <IMAGE></p> |
