Evaluation of the Analgesic Effect of Bilateral Superficial Cervical Plexus Block for Thyroid Surgery: A Comparison of Presurgical with Postsurgical Block.

Bilateral superficial cervical plexus block may help in reduction of postthyroidectomy pain. The aim of this study was to evaluate the influence of bilateral superficial cervical plexus block (BSCB) given either presurgically or postsurgically on analgesia in postthyroidectomy patients. Sixty adult euthyroid patients were randomly allocated to one of the three groups, to receive BSCB either presurgically (group A) or postsurgically (group B). Both of the above groups were compared with parenteral analgesics (group C). Thyroid surgery was performed according to a standardised procedure. Postoperative pain was assessed by visual analog scale (VAS), with 10 being the worst pain and 0 being no pain, when patient was fully awake and extubated (0) and after 1, 2, 4, 8, 12, 18, 24, 36 and 48 h. VAS was assessed at four phases: at rest, neck movements, vocalisation and swallowing. Total use of intraoperative fentanyl was noted. The time for first rescue analgesic was also noted. There was no significant statistical difference amongst three groups as regards demographic data and duration of surgery. Patients given BSCBs (either presurgically or postsurgically) had significant lower VAS at all four phases of pain assessment as compared to group C. The time for first rescue analgesia was the earliest in group C. We concluded that BSCB whether given presurgically or postsurgically significantly reduce pain intensity and opioids requirement in postoperative period after thyroid surgery.