What is the recommended technique for aspiration before an injection?

The recommended technique for aspiration before an injection involves applying a short, sharp pressure backwards on the syringe plunger. This method allows the clinician to quickly determine whether the needle has inadvertently entered a blood vessel, helping to ensure the safety and effectiveness of the injection.

When aspiration is performed correctly, if blood is seen in the syringe chamber after pulling back on the plunger, it indicates that the needle tip may be within a blood vessel, and the clinician should consider repositioning the needle before proceeding with the injection. The emphasis on a "short, sharp" motion reflects the need for a quick check that maintains the integrity of the injection process without causing unnecessary discomfort to the patient.

In contrast, other techniques such as prolonged pressure or turning the needle between aspirations may not effectively provide the necessary feedback to assess vascular placement and could complicate the administrative procedure without adding benefit. Therefore, a quick, decisive action is optimal for ensuring patient safety.