Intraocular pressure and quality of blockade in peribulbar anesthesia using ropivacaine or lidocaine with adrenaline: a double-blind randomized study.

The aim of this study was to compare the effects of ropivacaine with those of lidocaine on the intraocular pressure (IOP) and the quality of the blockade in peribulbar anesthesia for cataract surgery. Fifty patients were allocated randomly into two groups and received 7-10 ml of 0.75% ropivacaine or 2% lidocaine with adrenaline, though the peribulbar two-point injection. The quality of the blockade was assessed by ocular and eyelid akinesia, pain during the peribulbar injection, and surgical satisfaction. The duration of the motor block was also evaluated after surgery. The IOP was measured using a Tonopen before the blockade (control) and at 1, 5, and 10 min after injection of the anesthetic. Lidocaine induced significantly lower akinesia scores at 6, 8, and 10 min post-injection than did ropivacaine. The mean IOP (mmHg) was significantly lower with respect to the baseline level at 10 min after blockade in the ropivacaine group compared with the lidocaine group. Ropivacaine also caused less pain on injection. There was no difference in surgical satisfaction between the groups. The duration of the motor block obtained with ropivacaine was longer than that obtained with lidocaine. Our data indicate that ropivacaine has efficacy similar to lidocaine, with slightly longer onset and duration of the motor blockade. In addition, ropivacaine (0.75%) induces lower IOP and less pain on injection than does lidocaine (2%) when used in peribulbar anesthesia for cataract surgery.