The cardiocyclograph is an electronic instrument which records electrocardiograms which show simply and clearly a time analysis of the curve being recorded. It also indicates changes in the rhythm of the heart contractions. The electrocardiograph is recorded on photographic paper in the form of segments corresponding to one heart-contraction cycle. This instrument can be used to record the pulse of peripheral arteries by use of a piezosensor connected to the input of the electrocardiographic amplifier. Simultaneous electrocardiograms and continuous visual observations of the state of cardiac activity can be made by means of the electron beam tube of the input unit.