Can subarachnoid anesthesia + epidural anesthesia be performed sequentially?

This method is certainly possible, but can you ensure that the position of the catheter does not change during the operation with the epidural catheter before the operation? Have any tests been done to ensure the effective implementation of epidural anesthesia during catheter placement? Is it possible to ensure that the catheter is sterile without bringing bacteria into the epidural space and cause infection during the operation? Is it possible to ensure that the elderly can tolerate prolonged awake and supine surgery? These are all problems, how do you deal with it once the epidural is ineffective? The elderly have poor cardiopulmonary function, how to ensure that you have carbon dioxide accumulation after adding sedative drugs? In fact, advanced age and poor physical fitness are not contraindications to general anesthesia. On the contrary, patients are more likely to have accidents during intraspinal anesthesia. You can choose anesthesia operations and drugs that have little effect on hemodynamics, such as etomidate, laryngeal mask, and pre-pump Dopamine, etc., as long as you take care of yourself, you can solve it.

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