• Joerg Ender, Gabor Erdoes, Eugen Krohmer, Derk Olthoff, and Chirojit Mukherjee.
• Department of Anesthesiology and Intensive Care Medicine II, University of Leipzig, Heart Center, Leipzig, Germany. joerg.ender@medizin.uni-leipzig.de
• J. Cardiothorac. Vasc. Anesth. 2009 Aug 1;23(4):457-61.

ObjectiveCompare changes in P-wave amplitude of the intra-atrial electrocardiogram (ECG) and its corresponding transesophageal echocardiography (TEE)-controlled position to verify the exact localization of a central venous catheter (CVC) tip.DesignA prospective study.SettingUniversity, single-institutional setting.ParticipantsTwo hundred patients undergoing elective cardiac surgery.InterventionsCVC placement via the right internal jugular vein with ECG control using the guidewire technique and TEE control in 4 different phases: phase 1: CVC placement with normalized P wave and measurement of distance from the crista terminalis to the CVC tip; phase 2: TEE-controlled placement of the CVC tip; parallel to the superior vena cava (SVC) and measurements of P-wave amplitude; phase 3: influence of head positioning on CVC migration; and phase 4: evaluation of positioning of the CVC postoperatively using a chest x-ray.Measurements And Main ResultsThe CVC tip could only be visualized in 67 patients on TEE with a normalized P wave. In 198 patients with the CVC parallel to the SVC wall controlled by TEE (phase 2), an elevated P wave was observed. Different head movements led to no significant migration of the CVC (phase 3). On a postoperative chest-x-ray, the CVC position was correct in 87.6% (phase 4).ConclusionThe study suggests that the position of the CVC tip is located parallel to the SVC and 1.5 cm above the crista terminalis if the P wave starts to decrease during withdrawal of the catheter. The authors recommend that ECG control as per their study should be routinely used for placement of central venous catheters via the right internal jugular vein.

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