The St. Louis Blues have agreed to terms on a seven-year deal with defenseman Alex Pietrangelo.Pietrangelo, 23, dressed in 47 games last season, leading the Blues’ defense with 24 points (five goals and 19 assists) while ranking 13th in ice time per game (25:06) among all National Hockey League (NHL) defensemen. Since his first full season in 2010, Pietrangelo is tied for sixth among all defensemen in points (118), ranks 10th in goals (28), tied for ninth in assists (90) and slots 15th in plus/minus (+34) while he became the youngest defenseman in Blues history to record back-to-back 40-plus point seasons in 2010-11 (43) and 2011-12 (51).