Methods Written informed consent was obtained from a female (age 43) and a male (age 30) candidated to trans-axillary left supernumerary first rib resection. M-SBP block were performed with 10 mL of 2% carbocyanine, reaching the brachial plexus and the first rib periosteum (Figure 2 ). PSP block 3 were performed over the third rib, injecting 15 mL of 7,5% ropivacaine between the pectoralis minor and serratus anterior (Figure 3 ). Surgery was carried out in spontaneous breathing under sedation

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... th Propofol 2% continuous infusion. During the opening of the pleura, the lung collapsed, facilitating surgical manoeuvres, and finally reducing surgical timing and lung injuries.