Abstract: A method and apparatus to assess cardiac function in a subject involves supporting a probe in the trachea for transmitting movement of the trachea in response to heart function. The transmitted movement is detected by a sensor which generates a waveform signal. The waveform signal is displayed and assessed to determine cardiac function. By directly engaging the trachea, the apparatus and method of the present invention are sensitive to very small accelerations, velocities or displacements of the trachea to permit accurate measurement of cardiac function.

Abstract: An apparatus and method to assess cardiac function in a human has a sensing mechanism to be positioned on the thyroid cartilage in the neck against the trachea. The sensing mechanism is able to sense a response of the thyroid cartilage to heart function. The apparatus includes a restraining system to hold the sensing mechanism in position. The method of determining cardiac function comprises sensing the response of the thyroid and trachea to heart function.