A New Method for Direct Electric Registration of the Intra‐Arterial Pressure in Man, with Examples of its Application.

Summary. A new manometer is described with electric transmission for direct mensuration of the intra‐arterial pressure in man. Its static and dynamic sensitivity is such that all the details of the course of the curve are reproduced without distortion, both as regards time and amplitude. The pressure variations act on a condenser chamber and are registered as changes of capacity. As examples of its use experiments are described with simultaneously registrations of the intra‐arterial pressure and the electrocardiogram, and with simultaneous registrations of the pressure in the brachial and femoral arteries. Besides, the arterial pressure was measured under the effect of amyl nitrite and local occlusion distal from the point where the pressure was taken. The various components of the pressure curve, and their variations under these conditions, are discussed.