PSA injections have a higher risk of hematoma formation than IA injections.

PSA injections have a higher risk of hematoma formation than IA injections.

• A. True
• B. False
• C. Not enough information
• D. It depends on technique

Answer: (A)

Hematoma risk during nerve blocks is largely shaped by the nearby blood vessels that the needle may encounter. The PSA block targets the posterior superior alveolar nerve in a region rich with vascular structures, including the pterygoid venous plexus and posterior superior alveolar vessels. This anatomy makes accidental vessel puncture more likely, so a hematoma is more probable with a PSA injection. The inferior alveolar block goes into the pterygomandibular space where vessels are present but not as densely clustered along the needle path, so hematomas occur less frequently there. While good technique—careful aspiration, slow injection, and appropriate needle choice—can reduce the risk for any block, the inherent anatomy of the PSA region yields a higher baseline risk of hematoma compared with the IA block. Not providing enough information isn’t appropriate here, and saying the risk depends completely on technique would downplay the anatomical predisposition that makes PSA hematomas more likely.

Hematoma risk during nerve blocks is largely shaped by the nearby blood vessels that the needle may encounter. The PSA block targets the posterior superior alveolar nerve in a region rich with vascular structures, including the pterygoid venous plexus and posterior superior alveolar vessels. This anatomy makes accidental vessel puncture more likely, so a hematoma is more probable with a PSA injection. The inferior alveolar block goes into the pterygomandibular space where vessels are present but not as densely clustered along the needle path, so hematomas occur less frequently there. While good technique—careful aspiration, slow injection, and appropriate needle choice—can reduce the risk for any block, the inherent anatomy of the PSA region yields a higher baseline risk of hematoma compared with the IA block. Not providing enough information isn’t appropriate here, and saying the risk depends completely on technique would downplay the anatomical predisposition that makes PSA hematomas more likely.