Spinal Anesthesia Using 0.75 % Hyperbaric Levobupivacaine for Outpatient Knee Arthroscopy: Randomized Double-Blind Study Comparing Three Different Doses
Abstract
Objetive. To assess the probability of motor block through time by means of a comparison between three doses of 0.75 % hyperbaric levobupivacaine (HLBP) using a unilateral spinal technique.
Methodos. 180 ASA I-II patients between 18 and 60 years of age scheduled for unilateral knee arthroscopy were randomized prospectively to receive 7.5 mg (n = 59), 9.37 mg (n = 61) and 11.25 mg (n = 60) of 0.75 % HLBP through a 27-gauge Whitacre needle, and were left in a lateral decubitus position for five minutes. An independent observer assessed the level of motor and sensory block after returning to the supine position, at the end of surgery, and every ten minutes in the PACU until discharge.
Results. There were no diferences in demographics or failure rates among the groups among the groups. The time for complete resolution of the respecmotor block was shorter when 7.5 mg were used (145 ± 49 vs. 156 ± 65 vs. 170 ± 70.5 min, respectively. P = 0,006). Length of stay in the PACU was also shorter (155 ± 45 vs. 178 ± 70 and 184 ± 72 min, respectively, P = 0,004), with no difference in the time periods for the resolution of the sensory block. The probability of block resolution after 200 minutes was significantly higher in the group receiving 7.5 mg [0.95 (95 % CI 0.84 - 0.98) vs. 0.80 (0.67 - 0.88) vs. 0.73 (0.59 - 0.82), respectively. OR: 1.84 (95 % CI 1.28 - 2.64].
Conclusions. The spinal administration of 7.5 mg of 0.75 % HLBP is effective and safe in patients undergoing unilateral arthroscopic procedures of the knee. This reduces length of stay in the recovery room and the duration of the motor block.
References
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