Is a high epidural block the same as a low epidural block with a higher volume of the anesthesic or is a high epidural block administered more cranially between the lumbar vertebrae?
Epidural block height is affected primarily by the level of injection. In the cervical region, drugs administered in the epidural space mostly spread caudally, while in the midthoracic region (level of Th2–Th6), the expansion is equally cranial and caudal. By administering the epidural drugs in the lower thoracic region (Th6-L1), the spread is only cranial. After a lumbar epidural, the spread is more cranial than caudal with a delay in the onset of anesthesia at the L5-S1 segments because of the larger size of these nerve roots. The position of the patient on the bed does not affect the spread of the medications in the epidural space, regardless of whether the patient is in a sitting or lateral position.
https://www.intechopen.com/chapters/85295
The location of block also affects it. A caudal espp in sitting position
I think that the difference remain at how they act and site of administration to patient
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