What complication is often associated with prolonged pressure during local anesthetic injections?

Prolonged pressure during local anesthetic injections can lead to permanent nerve damage. This complication arises from the mechanical compression of nerves due to sustained pressure, which can disrupt their normal function and possibly lead to ischemia. Ischemia occurs when the blood supply to the nerve is restricted, which can result in irreversible changes to the nerve structure and function if not promptly resolved. Therefore, awareness of this risk is crucial during anesthesia administration, as it emphasizes the importance of proper technique to minimize pressure on surrounding tissues and nerves during the injection process.

Other options do not correlate with the effects of prolonged pressure during local anesthetic administration. For instance, immediate relief from pain and higher effectiveness of anesthesia are not realistic outcomes of prolonged pressure, as such pressure could actually cause more harm than benefit. Increased blood flow would contrast with the idea of nerve compromise; accordingly, it is not a complication associated with prolonged pressure during injections.