Abstract
BACKGROUND This study was conducted to compare and evaluate the efficacy and safety of prior intravenous dexmedetomidine with intravenous lignocaine as pre-treatment for prevention of propofol injection pain. METHODS In this prospective, randomised and double blinded clinical study, a total of 200 patients aged between 18 and 70 years of American Society of Anaesthesiologists (ASA) grade I or II posted for elective surgery under general anaesthesia utilising propofol as the inducing agent, were randomly allocated into two groups of 100 patients each, using computer generated random number tables. Group I received intravenous lignocaine 0.2 mg / Kg and group II received intravenous dexmedetomidine 0.5 mcg / Kg respectively prior to administration of propofol (2 mg / Kg) for induction during general anaesthesia. Pain during propofol administration was assessed for each patient using the McCririck and Hunter scale. Peri-operative haemodynamic changes and side effects were noted. Data was analysed using chi-square test and a P-value < 0.05 was considered to be statistically significant. RESULTS A total of 200 patients (100 patients in lignocaine group and 100 patients in dexmedetomidine group) were studied. Statistically significant (P < 0.05) diminution in pain score was discovered to be higher in group II (dexmedetomidine) as compared to group I (lignocaine). 80 % in the dexmedetomidine group had no pain compared to 62 % of the patients in the lignocaine group which is statistically significant. Dexmedetomidine also had a more remarkable effect on the heart rate (10 minutes after intubation) compared to lignocaine, with P = 0.054 which is statistically significant. CONCLUSIONS Intravenous dexmedetomidine is a superior pre-medication compared to intravenous lignocaine in the prevention of pain following propofol administration. It also has additional properties of sedation, analgesia, anxiolysis and sympatholytic action making it a better alternative for the anaesthesiologist and the patient. KEY WORDS Analgesia, Anxiolysis, Pre-Treatment, General Anaesthesia, Sedation, Sympatholytic Action
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