Final answer:
In hypovolemic shock, an 18G or 20G catheter is typically used to start an IV for faster fluid delivery. However, a smaller gauge catheter like a 22G may be used for patients with small or fragile veins.
Step-by-step explanation:
In hypovolemic shock, which is characterized by low blood volume, it is important to establish intravenous access quickly. The gauge of the catheter chosen depends on the severity of the shock and the condition of the patient's veins. Typically, a 18G or 20G catheter is used to start an IV in hypovolemic shock. These larger gauge catheters allow for a faster flow rate and are better suited for delivering large volumes of fluids. However, in some cases where the patient has small or fragile veins, a smaller gauge catheter like a 22G may be used.