Any contraindication to neuraxial anesthesia (history of neurologic disease (e.g., multiple sclerosis, spinal stenosis, central or peripheral neuropathy)
Pre-existing/chronic back pain
Ester local anesthetic allergy, PABA allergy
History of atypical cholinesterase (CP is metabolized by cholinesterase)

NCT02862912_exc_T1
Condition
contraindication
NCT02862912_exc_T2
Drug
neuraxial anesthesia
NCT02862912_exc_T3
Observation
history
NCT02862912_exc_T4
Condition
neurologic disease
NCT02862912_exc_T5
Condition
multiple sclerosis
NCT02862912_exc_T6
Condition
spinal stenosis
NCT02862912_exc_T7
Condition
central neuropathy
NCT02862912_exc_T8
Condition
peripheral neuropathy
NCT02862912_exc_T9
Scope
multiple sclerosis, spinal stenosis, central or peripheral neuropathy
NCT02862912_exc_T10
Scope
history of neurologic disease (e.g., multiple sclerosis, spinal stenosis, central or peripheral neuropathy
NCT02862912_exc_T11
Scope
contraindication to neuraxial anesthesia
NCT02862912_exc_T12
Qualifier
chronic
NCT02862912_exc_T13
Temporal
Pre-existing
NCT02862912_exc_T14
Condition
back pain
NCT02862912_exc_T15
Scope
Pre-existing/chronic
NCT02862912_exc_T16
Drug
Ester local anesthetic
NCT02862912_exc_T17
Condition
allergy
NCT02862912_exc_T18
Drug
PABA
NCT02862912_exc_T19
Condition
allergy
NCT02862912_exc_T20
Observation
History
NCT02862912_exc_T21
Drug
atypical cholinesterase