抄録
The apparatus of apexcardiograph which was designed by us consists of transducer, filter, amplifier, recorder and monitor.
The apexcardiogram is recorded by means of a linear crystal microphone which is connected to commercial oscillographic photographic recorder.
The low pass filter was devised. It was set to 0.1 cps for the lower limit and to 16 cps for the higher limit.
The patient is placed usually in left lateral decubitus position, rarely in semi-recumbent or supine position, and the point of maximal apex pulsation is determined by palpation.
In this way the apexcardiogram is recorded simultaneously with the electrocardiogram and phonocardiogram.
The tracings are recorded at a paper speed of 50 mm/sec. or 100 mm/sec, with 0.05 second time lines.
