Comparison of the effect of intravenous dexmedetomidine and lignocaine spray instilled into the endotracheal tube on extubation response in patients undergoing spine surgery

Abstract

Background: In spine surgery rapid emergence and extubation with haemodynamic stability is crucial for early neurological examination. Here, we have studied the effect of α2 agonist – dexmedetomidine intravenous (IV) and lignocaine spray instilled into the endotracheal tube at the end of the procedure to attenuate the extubation responses. Methods: A total of 45 patients undergoing spine surgery were randomly allocated in three groups. After the return of spontaneous respiration, Group-D: Dexmedetomidine 0.3 mcg/kg IV, Group-L: 10% lignocaine spray 1.5 mg/kg through endotracheal route and Group-P: Normal saline IV given over 60 s. Haemodynamic responses (systolic blood pressure, diastolic blood pressure, mean arterial pressure [MAP], heart rate [HR] and SpO₂) were recorded before and after administration of drugs and also duration of emergence, extubation, quality of extubation and post-operative sedation level were evaluated. Results: The increase in MAP and HR during extubation was significantly less in Group-D than Group-L and Group-P, 2 min after administration of the respective drugs (P < 0.05). There were no significant differences in the grade of a cough after extubation and post-operative sedation level. Conclusion: Dexmedetomidine (0.3 mcg/kg) attenuates haemodynamic response better than lignocaine spray (1.5 mg/kg) during emergence and extubation. It also provides smooth extubation and easy recovery without any post-operative sedative effect.

Keywords

Airway response - dexmedetomidine - haemodynamic response - lignocaine spray - tracheal extubation

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