Kjelstrup T, Ludwig M, Hüsch M
Anestesiavdelingen, Allgemeines Krankenhaus Celle, Tyskland.
Tidsskr Nor Laegeforen. 1991 Feb 20;111(5):599-601.
The position of a central venous catheter has to be controlled. As a supplement to radiography of the chest the position of the catheter tip can be documented by means of ECG. The ECG is recorded with the catheter tip functioning as one of the electrodes. If the catheter tip is situated in the right atrium the ECG will record an elevated P-wave. When the catheter is pulled back into the vena cava superior the atrial-P will assume a normal shape. The position of the catheter tip correlates with the morphology of the P-wave. An ECG recording performed during insertion of the catheter can be used to achieve correct positioning of the catheter to start with and thereby reduce the frequency of having to replace wrongly positioned catheters. Intraoperatively the ECG recording is a practical method of achieving correct and extracardial placement of the catheter tip.
必须控制中心静脉导管的位置。作为胸部X线摄影的补充，导管尖端的位置可以通过心电图记录。以导管尖端作为电极之一记录心电图。如果导管尖端位于右心房，心电图将记录到P波抬高。当导管回撤至上腔静脉时，心房P波将恢复正常形态。导管尖端的位置与P波形态相关。在导管插入过程中进行的心电图记录可用于一开始就实现导管的正确定位，从而减少更换位置错误导管的频率。在手术过程中，心电图记录是实现导管尖端正确心外放置的实用方法。
