We would like to thank Dr. Liang and colleagues for the interest they devoted to our study and for their astute comments regarding it.Aging affects the pharmacokinetics and pharmacodynamics of local anesthetics. Concerns with the geriatric patients regarding the administration of regional anesthesia are mostly increased sensitivity to local anesthetics, higher level of block, greater degree of hypotension, and bradycardia even with doses similar to those in younger adults.1 The positive correlation between age and the extent of spread of analgesia has been shown in several studies.
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