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  Indian J Med Microbiol
 

Figure 4: Linear correlation aggregation analysis graph showing the correlation of pre-procedural epidural space depth (calculated by ultrasound scanning of the spine) and the depth measured after the procedure between the acoustic puncture assist device and loss of resistance group. In right graph, acoustic puncture assist device group (r = 0.9720, P < 0.001) showing close correlation between ultrasonography epidural depth and procedural depth, similar results were found in left graph of loss of resistance group (r = 0.970, P < 0.001)

Figure 4: Linear correlation aggregation analysis graph showing the correlation of pre-procedural epidural space depth (calculated by ultrasound scanning of the spine) and the depth measured after the procedure between the acoustic puncture assist device and loss of resistance group. In right graph, acoustic puncture assist device group (<i>r</i> = 0.9720, <i>P</i> < 0.001) showing close correlation between ultrasonography epidural depth and procedural depth, similar results were found in left graph of loss of resistance group (<i>r</i> = 0.970, <i>P</i> < 0.001)