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The feasibility of pressure measurement during an ultrasound-guided thoracic paravertebral block.

Ultrasound-guided thoracic paravertebral block (UGTPVB) has become widespread recently. TPVB is a relatively difficult technique among ultrasound-guided nerve blocks because the paravertebral space is not completely visualised. The pressure measurement during the procedure is reported to improve success rate of TPVB in traditional landmark approach. We hypothesised that the pressure measurement at the needle tip was similarly helpful in UG-TPVB and investigated whether there is a notable difference between the pressures of the intercostal muscle and paravertebral space during TPVB with transversal intercostal in-plane approach.