Shares of Abbott Laboratories tumbled on Thursday after the medical devices maker posted fourth-quarter earnings and sales that underwhelmed Wall Street. For the fourth quarter, Abbott reported adjusted earnings of $1.50 a share, slightly better than the $1.49 consensus among analysts tracked by FactSet The company logged roughly $11.5 billion in sales, missing the $11.8 billion analysts had forecast. The company said it expects full-year adjusted earnings in the range of $5.55 to $5.80 a share.