Abstract: Systems, devices, and methods to measure interstitial concentration of selected compounds over time to provide early detection of shock are described. In an example method, interstitial fluid is obtained from a subject. Analytes are detected in the interstitial fluid. At least one of the analytes corresponds to hypoxia of a tissue of the subject and at least one other analyte corresponds to vascular permeability of the subject. The example method further includes determining whether the subject is in shock based on a computing model and the detected analytes and generating an alert based on whether the subject is in shock. Treatments can be administered following the alert generation.

Abstract: The fan speed control circuit and system of the present invention includes a capacitor or internally triggered triac to enable current to flow across the terminals of an electrical switch for a fan motor when the switch is in the open and OFF position to permit continued operation of a fan so that the system complies with the ASHRAE 62.2 standard. The capacitor may be of a fixed value so that the speed of the fan motor is reduced to a fixed level when the switch is open and OFF. Alternatively, a potentiometer and internally triggered triac arrangement may be used to permit adjustment of the level to which the speed of the fan drops to when the switch is actuated to the open and OFF position. The present invention is a viable less expensive option to prior art microprocessor based fan speed control circuits.