Cauda Equina Syndrome After Sacral Injections: Emergency Management

Immediate Recognition and Classification

The British journal of neurosurgery recommends determining the stage of Cauda Equina Syndrome (CES) as it dictates both urgency and prognosis, with outcomes critically dependent on whether the patient still has voluntary bladder control at the time of intervention 1
Patients with CES Suspected (CESS) should undergo emergency MRI and surgical discussion, with surgery typically performed the next day unless progression occurs, as recommended by the British journal of neurosurgery 1
Patients with CES Incomplete (CESI) have objective signs of CES but retained voluntary bladder control, requiring emergency surgical decompression by day or night, as indicated by the British journal of neurosurgery 1
Patients with CES with Retention (CESR) have complete urinary retention with paralyzed, insensate bladder, requiring operative intervention emergently within 12 hours if presentation is recent or if any perineal sensation remains, according to the British journal of neurosurgery 1

A neurological examination should be performed to test perineal sensation bilaterally, perform digital rectal exam for anal tone, assess bilateral lower extremity motor function and reflexes, as recommended by the British journal of neurosurgery and Praxis Medical Insights 1, 2
Bladder assessment should determine if the patient can voluntarily void, without catheterization before this assessment, as recommended by the British journal of neurosurgery 1
Emergency MRI lumbar spine without contrast is mandatory and should not be delayed, as indicated by Praxis Medical Insights 3, 4

For CESI patients, emergency surgical decompression by day or night is indicated, as these patients typically achieve normal or socially normal bladder and bowel control long-term if treated before progression to retention, according to the British journal of neurosurgery 1
For CESR patients, operative intervention is emergently required if within 12 hours of retention onset or if any perineal sensation persists, as recovery of function is more likely with preserved sensation, as recommended by the British journal of neurosurgery 1

The British journal of neurosurgery and Praxis Medical Insights recommend not waiting for "white flag" symptoms, as by this stage, permanent damage is likely despite surgery 1, 2
The PM&R journal and Praxis Medical Insights recommend not dismissing bilateral leg symptoms as routine post-injection effects, as bilateral radiculopathy is the earliest red flag distinguishing CES from simple transient sciatic block 5, 2
The British journal of neurosurgery recommends not catheterizing before determining retention status, as this prevents accurate staging and may lead to inappropriate surgical timing 1
Praxis Medical Insights recommends not delaying MRI for "observation", as even subtle clinical findings warrant immediate imaging in the post-injection setting 3, 4

The British journal of neurosurgery reports that 90%+ of CESI patients achieve normal or socially normal function, and 48-93% of CESR patients within 12-72 hours show improvement, but many have severe residual deficits 1
The British journal of neurosurgery also reports that delayed CESR treatment results in the majority requiring permanent catheterization, with only a minority returning to work 1