Background: Fast onset and short duration are prominent properties of the amide-type local anaesthetic articaine. Similar to bupivacaine, a hyperbaric solution of articaine may produce faster onset and shorter duration of spinal anaesthesia than a plain solution.
Methods: Patients undergoing open inguinal hernia repair received in random order articaine 84 mg in either hyperbaric (HyperA, n=49) or plain solution (PlainA, n=48) intrathecally. A blinded observer tested the dermatomal spread (pinprick) and motor block (Bromage scale).
Results: Median (range) onset time to the T(10) dermatome was 2 (2-8) (n=46) and 6 (2-30) min (n=39) (P<0.001), and the duration of the sensory block at (or above) the T(10) dermatome was 86 (39-148) and 69 (15-118) min (P=0.007), in Groups HyperA and PlainA, respectively. Peak sensory block was greater in Group HyperA T(4) (L(2)-C(2)) than in Group PlainA T(8)-T(7) (L(3)-T(3)) dermatome, median (range), P<0.001. Spread of the block to the cervical dermatomes associated with hypotension occurred in three patients of Group HyperA (one patient C(2) and two C(4)). The sensory block resolved to the S(2) dermatome significantly faster in Group HyperA, 2.5 (1.5-4.5) h, than in Group PlainA, 3.5 (2.0-4.5) h (P<0.001). Median duration of the motor block was significantly shorter in Group HyperA, 2.0 (1.3-3.5) vs 3.0 (1.5-4.0) h (P<0.001).
Conclusions: Hyperbaric articaine 84 mg had a faster onset and shorter duration of spinal anaesthesia than the plain solution.
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