Effects of Catheter Tip Location on the Spread of Sensory Block Caused by a Continuous Thoracic Paravertebral Block: A Prospective, Randomized, Controlled, Double-Blind Study

Table 2

Distribution of radiopaque dye.

	Group A; (n = 22)	Group P; (n = 25)	P-value
Number of segments reached by the dye	3 (2.75–4 )	3 (2–4 )	0.81
Types of spread
TPVS + IC	11	11	0.10
TPVS + IC + PREV	1	1
TPVS + CL	1	0
CL	6	2
CL + IC	0	4
IC	3	7

The data are shown as the median (interquartile range [range]) or number. The P-values were calculated using the Mann-Whitney U test or Fisher’s exact test as appropriate.
TPVS: spread in the thoracic paravertebral space; IC: intercostal spread; PREV: prevertebral spread; CL: cloud-like spread.