I have not found any evidence that engorgement affects the milk ducts. Engorgement may affect the secretory cells that develop on the basement membranes, therefore affecting lactation for that cycle. But since the ducts develop during puberty and pregnancy, it is unlikely that they are affected by engorgement. Linda J. Smith, BSE, FACCE, IBCLC Bright Future Lactation Resource Centre Dayton, OH USA http://www.bflrc.com