Combcard

The combcard is a red ECG (electrocardiogram) cable with a pushbutton and a crocodile clip.

The push button is connected to the ECG monitor. The crocodile clip is connected to the guidewire whose « J » tip (and only the J tip) protrudes the distal end of the catheter. When the tip of the central venous catheter reaches the superior vena cava and advances towards the right atrium, the P-wave gains in amplitude. When the P-wave is at half of the QRS wave or at its highest amplitude, without being biphasic (the P-wave must show no negative feature which would indicate that the catheter is within the right atrium and must be slightly withdrawn), the catheter is in the correct position.