Can sagittal approach for cadaveric study of TTP block spread more than transverse approach?

An ultrasound-guided transversus thoracic plane (TTP) block can release the pain at internal mammary area [1,2]. An injection point of the TTP block was between the transversus thoracic muscle and the intercostal muscle between the fourth and fifth ribs next to the sternum [3]. The spread of local anesthetic for peripheral nerve block is important for good perioperative pain management. In particular, the spread of local anesthetic for the TTP block is more important because of trunk block. There was no study, which investigated the difference of local anesthetic's spread in approach of the TTP block.

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