Noninvasive Ambulatory Measurements of Physiological Parameters Using a DLS-based Sensor

Ambulatory monitoring of physiological variables is important in following the health status of individuals in non-hospital controlled situations. The investigators are developing a non-invasive sensor based on dynamic light scattering that is able to measure pulse, blood flow and coagulability. Oxygen saturation can also be detected with minor modification of the apparatus. The investigators plan to validate the investigators sensor by applying it to patients in the intensive care unit, or to patients undergoing cardiac stress tests. The results of the investigators sensor will not be utilized for any therapeutic decisions, but will be collected for later comparison with conventional monitoring of pulse and oxygenation with standard monitors. The monitor is worn like a wrist watch, and will collect data into a small data storage disc for later analysis.