Table 2. ESP block characteristics.

Variable		Counting	Percentage
Lock Level	L3 Bilateral	3	18.8
	T7 Bilateral	2	12.5
	L2 Bilateral	2	12.5
	T9 Right	1	6.3
	T9 Bilateral	1	6.3
	Left T7 and Right T6	1	6.3
	Left T6	1	6.3
	Left T5	1	6.3
	T4 Bilateral	1	6.3
	Left T1	1	6.3
	Left L4 - L5	1	6.3
	L4 Bilateral	1	6.3
	Total	16	100.0
ESP technique	Ultrasound	11	68.8
	Fluoroscopy	4	25.0
	Tomography	1	6.3
	Total	16	100.0
Medication used	Methylpredisolone 20-40 mg + Ropivacaine 0.2 %	12	75.0
	Phenol 6-8 %	3	18.8
	Methylpredisolone 20 mg + Bupivacaine 0.25 %	1	6.3