Fig. 2

Body surface (left, top) and intracavity (left, down) electrocardiogram and an image on the display (right). Intracavity electrocardiogram was monitored via the peripherally inserted central catheter (PICC). Amplitude of the P waves is increased with advancing the PICC catheter and become highest with the tip located at the cavoatrial junction. Location of the tip of the PICC and the direction of the catheter are shown by a circle and a line, respectively, on the display