Floormat physiological sensor

A system for measuring a stroke volume value from a patient, comprising:

• a base comprising a bottom surface configured to rest on or near a substantially horizontal surface, and a top surface configured to receive at least one of the patient's feet;
• an electrical impedance system connected to the top surface, the electrical impedance system comprising at least four electrodes, at least one of which is configured to inject an electrical current into the patient's feet, and at least one of which is configured to measure a signal induced by the electrical current and representative of an impedance plethysmogram, wherein the electrical impedance system comprises an electrical system that comprises two electrodes that inject the electrical current, wherein both electrodes are disposed on the top surface, and one electrode is located substantially on the left-hand side of the top surface and configured to inject electrical current into the patient's left foot, and one electrode is located substantially on the right-hand side of the top surface and configured to inject electrical current into the patient's right foot;
• a weight-measuring system connected to the top surface, the weight-measuring system comprising an electrical system that measures a set of voltages that correlates with a force applied to the top surface;
• and
• a processing system in electrical contact with the electrical impedance system, and configured to receive signals from the electrical impedance system and convert them into a set of impedance values, the processing system further configured to analyze the set of impedance values to determine the stroke volume value.