ABSTRACT

Ageing induces functional changes in the nerves, and larger volumes of local anesthetic provide better quality sensory block than smaller volumes. Consequently, the effects of local anesthetics were retrospectively researched in young and old age groups, based on the different volumes of local anesthetics used.

Sensory and motor block was performed by nerve stimulator, and block formation and recovery times of 104 patients were assessed retrospectively. Patients were divided into two main groups as <35 y (Group A) and >55 y (Group B), and then into two subgroups as those with <30 ml or >30 ml local anesthetic administered. Evaluations were conducted based on these groups.

The length of time for the sensory and motor block formation was shorter in Group B patients compared to Group A patients in the <30 ml group (p<0.05). In Group B patients, the block formation was also significantly faster in those given <30 ml local anesthetic compared to those who were given >30 ml (p<0.05).

Lower local anesthetic volumes accelerate sensory and motor block formation time in older patients but not in younger patients. Higher local anesthetic volumes delay sensory and motor block recovery time in younger patients but not in older patients.

Keywords: Age, brachial plexus block, local anesthetic volumes