Central vascular catheter placement evaluation using saline flush and bedside echocardiography

Area of Science:

• Critical Care Medicine
• Cardiovascular Imaging
• Medical Procedures

Background:

• Central venous catheter (CVC) placement is a frequent and critical procedure in intensive care.
• Accurate CVC tip positioning is essential for patient safety and effective treatment.
• Traditional methods for confirming CVC placement, like chest radiography, have limitations.

Purpose of the Study:

• To evaluate echocardiographic features during a saline flush of CVCs.
• To determine if the rapid saline swirl in the right atrium (RASS) can confirm correct CVC tip placement.
• To compare the accuracy of RASS with postplacement chest radiography (CXR).

Main Methods:

• Prospective study of ED and ICU patients undergoing CVC placement.
• Echocardiography used to assess turbulent flow in the right atrium during saline flush.
• Defined the 'rapid atrial swirl sign' (RASS) as immediate turbulence (within 2 seconds).
• Compared echocardiographic findings with CVC tip location on CXR.

Main Results:

• In 135 subclavian and internal jugular CVCs, malposition was found in 3.0% on CXR.
• RASS demonstrated 75% sensitivity and 100% specificity for detecting malposition.
• Positive and negative predictive values were 100% and 99.24%, respectively.
• Mean time for turbulence onset in correctly placed CVCs was 1.1 seconds.

Conclusions:

• The rapid appearance of prominent right atrial turbulence on echocardiography after CVC saline flush is a precise bedside screening test.
• RASS can reliably confirm optimal central venous catheter tip position.
• This echocardiographic sign offers a valuable alternative for immediate CVC placement verification.