In case of massive bleeding during surgery which sized cannula is used?
**Core Concept**
In cases of massive bleeding during surgery, a large-bore cannula is required to facilitate rapid fluid resuscitation and blood transfusion. This is crucial to maintain the patient's circulating volume and prevent hypotension, shock, and organ failure.
**Why the Correct Answer is Right**
The correct answer is a large-bore cannula, typically 14-16G or even 12G, which allows for high-flow rates and rapid infusion of fluids and blood products. The large lumen size enables the cannula to handle high pressures and flow rates, making it ideal for emergency situations. The use of a large-bore cannula also reduces the risk of clot formation and occlusion, ensuring uninterrupted fluid administration.
**Why Each Wrong Option is Incorrect**
* **Option A:** A smaller cannula (e.g., 20-22G) would be inadequate for massive bleeding, as it would limit fluid resuscitation rates and increase the risk of clot formation.
* **Option B:** A peripheral IV cannula (e.g., 24-26G) is not designed for rapid fluid administration and would be insufficient for massive bleeding.
* **Option C:** An arterial cannula (e.g., 20-22G) is typically used for blood pressure monitoring and would not provide the high-flow rates required for massive bleeding.
**Clinical Pearl / High-Yield Fact**
In emergency situations, a large-bore cannula should be inserted as quickly and safely as possible to establish rapid fluid resuscitation. This is often referred to as a "big three" or "rapid infusion device" (RID) and should be available in every operating room and emergency department.
**Correct Answer:** C. 14-16G cannula