Erector Spinae Plane Block vs. PECS I-II Blocks After Breast-conserving Surgery

ESPB was applied to the patients in a sitting position. A high-frequency linear probe was used. Under sterile conditions, the USG probe was placed longitudinally approximately 2 cm lateral to the T4 spinous process. Skin, subcutaneous fat tissue, m. trapezius, rhomboid muscles, erector group muscles, transverse process, intercostal muscles, pleura and lung movements were visualized from superficial to deep structures. 1 ml of 2% lidocaine was injected into the estimated needle entry area. Then, with the block needle the m. trapezius, mm. rhomboidei and erector spinae muscles were passed in order with the in-plane method and the needle was brought into contact with the transverse process. Fascial separation was confirmed with 1-2 ml of saline solution and the block was performed by injecting 20 ml of 0.375% bupivacaine. The distribution of the drug was confirmed by observing it with USG.

"The PECSI and PECSII blocks were applied concurrently.~In patients who will undergo PECS II, sterile conditions were prepared with the arm on the side to be operated on in the supine position and 90 degrees of abduction. The lateral and pectoral branches of the thoracoacromial artery were visualized between the PM and Pm muscles at the level of the 4th rib under USG guidance. The blocking needle was directed between the PM and Pm muscles for PECS I, 1-2 ml of saline was injected to verify fascial spread, and 10 ml of 0.375% bupivacaine was applied. Afterwards, fascial spread was confirmed by injecting 1-2 ml of saline between the pectoralis minor muscle and the serratur anterior muscle, and PECS II was performed by injecting 10 ml of 0.375% concentration bupivacaine. The distribution of the drug was confirmed by observing it with USG."