Abstract: A method and system for the determination of the pH of a fluid by measuring the pH of the fluid and thereafter correcting the pH based upon the determination of measured and/or adjusted values of at least one other parameter, such as PO.sub.2 and PCO.sub.2, which relate to the fluid.

Abstract: An ambulatory system for recording and analyzing gastroesophageal reflux is presented. The system includes a digital recorder, an analysis software package and a catheter for measurement of changes in esophageal impedance. For the first time, gastroesophageal reflux can be detected with a pH above 4 (called alkaline reflux), which is the normal pH environment of the healthy esophagus. In addition, one embodiment of the invention allows for the determination of the direction of flow of the detected material in the esophagus, thus enabling the system to distinguish between swallowed saliva and alkaline gastroesophageal reflux. In yet a further embodiment, the present invention allows for recording and analysis of reflux on a non-invasive basis, by using pairs of externally worn impedance sensors. In another embodiment, the invention measures impedance simultaneously with other bio-parameters, such as pH or pressure.

Abstract: A method for a preferably ambulatory measuring and registration of at least one parameter in relation to the bilirubin presence in a measuring region in the gastrointestinal tract of a patient to determine the bilirubin presence in the region. The method is characterized in that the bilirubin presence determination is made in relation to the pH-value of the fluids in the region. The invention relates also to a system for performing the method.

Abstract: A method of determining the existence and location of an obstruction in a respiratory track includes introducing a first catheter having a first sensing site into the body of a patient until the first sensing site is positioned so that it is distal to the obstruction. The first catheter is used to monitor respiratory effort with generated signals indicative of respiratory effort. A second catheter having a second sensing site is positioned so that the second sensing site is near the nostrils. The second catheter is used to monitor actual respiration with generated signals indicative of actual respiration. The existence of the obstruction is verified by observing respiratory effort signals without corresponding actual respiration signals.

Abstract: The invention relates to a method and an apparatus for detecting muscular status. The apparatus includes an electrode (7) for taking up analog myoelectric signals, an amplifier (1) which is followed by an A/D converter to which is connected a signal processing unit (3). A signal (4) is connected to the signal processing unit.The analog signals collected by the electrode (7) are converted, after amplification, into binary signals which are analyzed in the signal processing unit (3). This calculates the occurrences of muscle activity below a certain muscle activity level related to an initial muscle activity determined on commencement of the detection. Signals relating to the occurrences of muscle activities below said level are emitted from the signal (4) or stored in a storage device.