Are local anesthesia vials similar to champagne: Do they lose their potency once opened?: An in vitro study
2017
Background and Objectives: Epinephrine is volatile and unstable on exposure to air. Addition of
sodium metabisulfite as an antioxidant has been effective, but there are no clear‑cut consensus on
its efficiency in retarding the oxidation that sets in once the anesthetic vials are kept open with a
needle in situ. There is a paucity of scientific data regarding the risks of reuse of anesthetic vials
following the use of cartridges, a common practice in western countries. It is our endeavor to shed
light on the constant change in pH, drug deterioration, and instability that sets in an anesthetic
vial with a needle in situ. Methods: Twenty sets of identical local anesthetic vials (lidocaine 2%
with 1:80,000 adrenaline) were collected. The samples were divided into four individual groups
followed by a segregation of 5 subsamples at varying time intervals from each individual group.
pH was measured using pH meter. Results: Change in the pH of the solution was noted as days
progressed in open local anesthetic vials when compared to closed vials. However, the decreased
pH remained constant following a brief time interval after complete conversion of sulfite to sulfate.
Conclusions: Local anesthetic vials with needle pricked in for a longer duration can alter the
pH, concentration of the vasoconstrictor and deteriorate the properties of local anesthetic solution.
This can manifest clinically as delayed onset of action, increased burning sensation, and pain on
administration
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