Paravertebral block decreases opioid administration without causing hypotension during transapical transcatheter aortic valve implantation.

Paravertebral block (PVB) is feasible for postoperative analgesia in patients who undergo cardiac surgery with unilateral thoracotomy. Postoperative continuous PVB is as effective as thoracic epidural anesthesia and is less likely to cause hypotension. However, the intraoperative utility and safety of PVB remains unclear. Therefore, the present study was conducted to determine the efficacy and hemodynamic influence of intraoperative paravertebral bolus injection during cardiac surgery. We retrospectively compared intraoperative medication use and blood pressure measurements between patients who underwent transapical transcatheter aortic valve implantation (TA-TAVI) with (PVB group, n = 46) or without (non-PVB group, n = 15) intraoperative PVB. Remifentanil administration was lower by more than 40 % in the PVB group compared with that in the non-PVB group (728 ± 319 µg vs. 1240 ± 488 µg, P < 0.001). The average and variability of intraoperative blood pressure showed no significant differences between groups. The duration of hypotension (blood pressure less than 80 % of baseline) was 25.1 ± 21.5 % and 25.4 ± 18.1 % of the entire anesthesia time in the non-PVB and PVB groups, respectively (P = 0.74). The use of inotropic and vasopressor agents was comparable between groups. Intraoperative paravertebral bolus injection decreased remifentanil administration without causing hypotension during TA-TAVI in hemodynamically unstable patients. This result suggests the intraoperative utility of PVB in cardiac surgery.