Impact of Pectoralis Nerve Block (PECS) on postoperative pain in patients submitted to mastectomy with lymphadenectomy oleh AMANDA LIRA DOS SANTOS LEITE, FREDERICO THEOBALDO RAMOS ROCHA, MICHELLE JACINTHA C. OLIVEIRA, ALDO VIEIRA BARROS, SILVIO MARCOS LIMA DOS SANTOS, ALBERSON MAYLSON RAMOS DA SILVA, DIEGO WINDSON DE ARAÚJO SILVESTRE, ELSON A C FOLHA FILHO, CAROLINE C FERRO, TAINA SANTOS BEZERRA, LAERCIO P FACHIN, DALMIR CAVALCANTI SANTOS, CARLOS ALBERTO DE CARVALHO FRAGA, CAROLINNE SALES-MARQUES