Intravenous access and cannulation principles

Welcome to this lecture on intravenous access and cannulation principles, providing an overview of the indications for intravenous access, the principles of selecting appropriate sites and cannula sizes, and the importance of a septic technique to prevent infection. We will discuss the systematic steps of intravenous cannulation, including preparation, insertion, and aftercare. Additionally, we will review potential complications such as infiltration, infection, and thrombophlebitis, as well as strategies for prevention and management. Intravenous access and cannulation are fundamental procedures in modern health care indicated in various clinical scenarios. Intravenous access enables rapid administration of fluids and blood products for managing dehydration or acute blood loss. It also ensures immediate and accurate delivery of medications, especially those needing swift action. Additionally, intravenous access is used for parenteral nutrition, blood sampling, and contrast administration. Sound clinical judgment is crucial in selecting the appropriate type of access. Selecting an appropriate site and cannula balances safety, comfort and effectiveness. Preferred sites are dorsal and metacarpal veins of the hands and lower arms in adults, as these veins are accessible and lower complication risks. In children, scalp or foot veins may be used. Avoid sites over joints, infected areas, or compromised limbs. Cannula bore size should also be considered.