Efficacy of Pectoral Nerve Block Type II for Breast-Conserving Surgery and Sentinel Lymph Node Biopsy: A Prospective Randomized Controlled Study

Figure 2

Opioid consumption as a function of breast cancer location. (a) Opioid consumption according to the quadrants of the breast. Patients with cancers located at 12, 3, 6, and 9 o’clock were not excluded because of the ambiguity of location. UOQ, upper outer quadrant; UIQ, upper inner quadrant; LOQ, lower outer quadrant; LIQ, lower inner quadrant; SA, subareolar; Ax, axilla; N, number of patients; values within parentheses denote mean fentanyl consumption. (b) Opioid consumption according to tumor location in the outer and inner areas of the breast, as determined by a line connecting the 12 o’clock and 6 o’clock positions. Patients with cancers located at 12 o’clock and 6 o’clock were not excluded, value < 0.05. (c) Opioid consumption according to tumor location in the upper and lower areas of the breast, as determined by a line connecting the 3 o’clock and 9 o’clock positions. Patients with cancers located at 3 o’clock and 9 o’clock were not excluded.

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