A non-invasive apparatus (10) for continuously measuring the cardiac output and cardio-respiratory function includes a gas sampling device which is inserted into the mouth of a human subject. The gas sampling device may be a disposable endotracheal tube (11) or a smaller disposable mouthpiece (143). Each of these gas sampling devices is provided with a plurality of passages for sampling the lung gases and for continuously sampling the gas pressure on opposite sides of a capillary restriction member (27). A miniature motor pump mass spectrometer module (12) is mounted on the upper end of the endotracheal tube or mouthpiece. Electronic circuitry (160) connected to the mass spectrometer permits constant visual monitoring of the cardiac output and cardio-respiratory function.
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