. 2022 Nov 28;24(3):283–290. doi: 10.1227/ons.0000000000000497

TABLE 4.

Previously Published Rates of Failure and Conversion to General Anesthesia in Lumbar Surgeries

Paper	Failure rates requiring conversion to general anesthesia, %	Patient sample size
Current study	0.7	422
Letchuman et al¹²	7	42
Kolcun et al¹³	4	544
Pierce et al⁹	3.9	625
Walcott et al ⁶	2.5	81
Lessing et al ¹⁴	0	56
Singeisen et al ¹⁵	1.9	368
West et al ¹⁶	0	34