Modified recording procedure for the determination of I/t-curves with arterial pulse recording and acoustic signal generation

I/t-curves were derived by means of a piezo-electric transducer. To receive the minimum responses more than just optically, an amplifier, which was coupled to a transducer, generated an acoustic signal. This modified technique serves to objectivity of the minimum response, which is important in the recording of the I/t-curves. As has been shown in a great number of tests, this procedure has proved to be useful in practice.