What needle gauge is commonly used for a subsacral nerve block?

• A. 20G
• B. 25G
• C. 28G
• D. 30G

Answer: (C)

The commonly used needle gauge for a subsacral nerve block is 28G. This choice is appropriate because a finer gauge needle, like the 28G, allows for better maneuverability and precision when injecting anesthetic agents in areas that may be difficult to access. The usage of a 28G needle minimizes tissue trauma, which is particularly important in delicate anatomical regions.

Finer needles also help with the more controlled delivery of anesthetic agents, thereby enhancing the effectiveness of the nerve block while reducing the likelihood of adverse reactions or complications. In clinical practice, the 28G needle is a standard tool among practitioners performing techniques such as the subsacral nerve block, as it balances the need for adequate anesthetic diffusion with minimal discomfort to the animal.

Other gauges listed may not offer the same level of control or may cause unnecessary trauma, making them less suitable for this specific procedure. This is key in maintaining the overall welfare of the animal while performing anesthesia in a field setting.