@crnaschoolprepacademy: A central line may feel like the most powerful access in the room, but central placement does not automatically mean high flow. A standard central venous catheter is long, and each lumen may have a relatively small internal diameter. Both characteristics increase resistance. A short, large-bore peripheral IV may deliver fluid faster because flow is strongly influenced by radius and inversely related to length. Poiseuille’s law gives us the framework: Flow ∝ pressure × radius⁴ ÷ viscosity × length The fourth-power relationship is the key. Small changes in internal radius can create large differences in flow. The rest of the system matters too. A long extension set, stopcock, needleless connector, viscous blood product, kink, or partial occlusion can become the rate-limiting component. One important distinction: a standard multilumen central line is not the same as a large-bore introducer or catheter specifically designed for rapid infusion. Do not ask only, “What gauge is the IV?” Ask: • What is the internal diameter? • How long is the catheter? • What fluid am I infusing? • What tubing and connectors are attached? • What flow rate is the device designed to deliver? Want help strengthening both your clinical knowledge and your CRNA school application? Comment WEEK and we’ll send you one free week inside CSPA, including educational resources, application guidance, and access to CRNA faculty coaches.

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