Abstract: An apparatus of the present invention induces hypothermia in a patient and effects cardio-pulmonary resuscitation on the patient. The apparatus including a gurney for supporting and facilitating transport of the patient, the gurney having at least a portion thereof in fluid communication with a coolant source, and a body suit having a thoracic cuff and an abdominal cuff. The thoracic and abdominal cuffs are sequentially inflatable and deflatable for sequentially compressing and releasing the thoracic and abdominal region of the patient to induce inhalation and exhalation in the lungs and circulation of the blood supply in the patient. The apparatus further including a head cooling device which includes a helmet adapted to be mounted on the head of the patient and a mask in fluid communication with a cooled oxygen source for supplying cooled oxygen to the lungs of the patient.

Abstract: A detector circuit (10) is programmed to produce an output signal when an input signal is at a predetermined frequency. The input signal is provided to an inverter (14) to produce an inverse signal. The input signal together with the inverse signal are provided to two switches (16, 18). The switches (16, 18) are driven by first and second drive signals produced by a drive generator (60). The output terminals (24, 28) of the switches are alternately connected to the input terminals in synchronism with the corresponding drive signals. The output signals from the switches (16, 18) are transmitted through low pass filters (26, 30) and the resulting signals are combined to produce a summation signal by a summation circuit (36). The summation signal is passed through an absolute value circuit (40) to produce an absolute value signal. The absolute value signal is examined by a threshold detector circuit (44) which produces an output when the absolute value signal exceeds a preset threshold.