Fig. 1From: Which ultrasound-guided parasternal intercostal nerve block for post-sternotomy pain? Results from a prospective observational studyA Ultrasound-guided superficial parasternal intercostal plane block (SPIP). The tip of the needle reaches the interfascial plane between pectoralis major muscle and external intercostal muscle. The dotted area indicates the local anesthetic spread. B Deep parasternal intercostal plane block (DPIP). In the picture clearly visible, the tip of the needle between the interior intercostal muscle and transverse thoracic muscle and the anesthetic solution’s spreadBack to article page