Nonetheless, there are a few basic principles that can help guide providers. This leads to difficulty in predicting reliable flow rates for each line. While sizing is based on the outer diameter of the catheter, the thickness of each catheter can differ, making the inner diameter variable. The exact difference between each catheter gauge was derived from wire manufacturing in the 19th century with no true mathematical formula to predict the difference in each gauge. In contrary, the gauge of a catheter is inversely proportional to the catheter size, making a 16 gauge larger than a 24 gauge for instance. Consequently, increasing the French corresponds to an increase in the size of the catheter. For example, a one millimeter catheter would be a 3 French. The French unit is the outer diameter of the catheter in millimeters multiplied by three. By convention, multi-lumen and very large catheters are measured with the French system, whereas single lumen catheters are generally measured by gauge. Traditionally, catheters are sized based on their outer luminal diameter. One important factor that must be considered when selecting an appropriate line is the size of the lumen(s). Whether it is administration of medications that cannot be given peripherally or rapid fluid resuscitation, the indication for this procedure can help dictate the type of line that should be placed. Prior to insertion of a central line, providers should carefully consider the indication for the procedure. From a MAC introducer to a single-lumen trauma catheter, there are countless varieties of central venous catheters available to the Emergency Physician.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |