PSA nerve block is contraindicated under which condition?

PSA nerve block is contraindicated under which condition?

• A. When risk of hemorrhage is too great or there is acute inflammation at the injection site
• B. For any patient with systemic disease
• C. When the patient is anxious
• D. For procedures involving only one maxillary tooth

Answer: (A)

The key idea is that this nerve block should be avoided when there is a real risk of bleeding or active infection at the injection site. The posterior superior alveolar region is highly vascular, with nearby vessels that can bleed easily if a needle is placed there. In patients with bleeding disorders or those on anticoagulants, a hematoma can form and spread into the surrounding spaces, complicating healing and sometimes causing functional issues like limited mouth opening. If there is acute inflammation or infection at the injection site, injecting into inflamed tissue can worsen the infection and provide a less effective anesthetic environment, since inflamed tissues often have a lower pH that can reduce anesthesia efficacy. Anxiety by itself is not a contraindication, systemic disease is not an automatic disqualifier, and if only one maxillary tooth needs treatment, clinicians might choose a different technique, but these situations do not constitute absolute contraindications like active bleeding risk or acute inflammation.

The key idea is that this nerve block should be avoided when there is a real risk of bleeding or active infection at the injection site. The posterior superior alveolar region is highly vascular, with nearby vessels that can bleed easily if a needle is placed there. In patients with bleeding disorders or those on anticoagulants, a hematoma can form and spread into the surrounding spaces, complicating healing and sometimes causing functional issues like limited mouth opening. If there is acute inflammation or infection at the injection site, injecting into inflamed tissue can worsen the infection and provide a less effective anesthetic environment, since inflamed tissues often have a lower pH that can reduce anesthesia efficacy.

Anxiety by itself is not a contraindication, systemic disease is not an automatic disqualifier, and if only one maxillary tooth needs treatment, clinicians might choose a different technique, but these situations do not constitute absolute contraindications like active bleeding risk or acute inflammation.