The Impact of Nerve Cross Section Area on Sensory Block Onset

The Impact of Nerve Cross Section Area on Sensory Block Onset. A Prospective, Monocentric Crossover Study on Volunteers

The study aims to describe a correlation between the nerve cross section and the sensory or motor block onset time. Therefore, different nerve cross sections with their Motor and sensory onset times are compared in order to find a correlation.

In the case of discovering a correlation, this could be translated into clinical practice, where a more tailored and individualized approach to performing peripheral nerve blocks would be possible, thus lowering the risks of adverse events occurring.

Inclusion Criteria:

• ASA I - II, both sexes
• ≥ 18 years old
• < 65 years old
• Written informed consent as documented by signature

Exclusion Criteria:

• Known allergy or hypersensitivity to a study drug or class of drug.
• Severe coagulopathy.
• History of alcohol abuse or the intake of psychotropic drugs.
• Pregnancy.
• Infection at the injection site or a systemic infection.
• Fever of unknown origin.
• Motor or sensory abnormalities in the arm.
• Previous enrollment into the current study