Intertransverse Process Block to Improve Quality of Recovery After Cardiac Surgery With Sternotomy

All blocks are performed by an anaesthesiologist who had previously performed ≥50 successful ITPB blocks, using Philips EPIQ ultrasound system, with a curved array transducer (C5-1), and 80mm echogenic nerve block needle. ITPB is performed with the patients positioned in a lateral decubitus position. The target intervertebral level (T4-5) is identified and marked in the preview ultrasound scan. The transducer is placed 2-3 cm lateral to the spinous process. Under strict asepsis, a single-level (T4-5) ultrasound-guided ITPB is performed with the in-plane insertion of the block needle from lateral to medial direction until its tip is at the medial aspect of the retro-SCTL space. After confirming the needle position by distension of the retro-SCTL space after a test bolus injection of 1-2 ml 0.9% normal saline, 25 ml 0.25% levobupivacaine is injected via the nerve block needle in small aliquots. The same procedure is repeated on the other side with the same v

All blocks are performed by an anaesthesiologist who had previously performed ≥50 successful ITPB blocks, using Philips EPIQ ultrasound system, with a curved array transducer (C5-1), and 80mm echogenic nerve block needle (SonoTAP; PAJUNK, Germany). ITPB is performed with the patients positioned in a lateral decubitus position. The target intervertebral level (T4-5) is identified and marked in the preview ultrasound scan. The transducer is placed 2-3 cm lateral to the spinous process. Under strict asepsis, a single-level (T4-5) ultrasound-guided ITPB is performed with the in-plane insertion of the block needle from lateral to medial direction until its tip is at the medial aspect of the retro-SCTL space. After confirming the needle position by distension of the retro-SCTL space after a test bolus injection of 1-2 ml 0.9% normal saline, 25 ml placebo is injected via the nerve block needle in small aliquots. The same procedure is repeated on the other side with the same volume study drug.

Drug used for intertransverse process block (intervention group)

As placebo for sham block group

Philips EPIQ ultrasound system, with a curved array transducer (C5-1), and 80mm echogenic nerve block needle (SonoTAP; PAJUNK, Germany)