A New Method for the Study of the Intracardiac Pressure Curve

THE method about to be described secures a correct record of any part of the intracardiac pressure curve, for it meets the theoret-Fig. 1.-Scheme illustrating the arrangement of the apparatus. The meaning of the abbreviations is given in the text. ieal requirements of a perfect method, in that it employs an incom-pressible fluid and at the same time practically does away with the inertia error. A short double eannla is passed into the left ventricle through the subclavian artery and aorta. One tube of the eanula is connected directly with a Itiirthle membrane manometer (Fig. 1, 3/[. B.) placed upside down. The recording lever of this manometer bears a wire, the ends of which are thrust into two mercury cups when the rising pressure in tile inverted manometer carries the recording lever downward. When the pressure in the manometer