Optimal site for the subpectoral interfascial plane block

The Subpectoral interfascial plane (SIP) block, which was first described in 2016 by Raza et al. [ 1], involves the injection of a local anesthetic into the space between the pectoral major muscle (PMM) and the external intercostal muscle (EIM). It anesthetizes the anterior rami of the T2 to T6; therefore, SIP block may be effective for the postoperative analgesia of the median sternotomy such as that following a cardiac surgery [2]. However, the spread of local anesthetic injected by the SIP block has still not been investigated.

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