Alivecor Inc. has elevated its patent dispute with Apple Inc. to the U.S. International Trade Commission (ITC) in a move that could damage the latter’s foray into digital health. Alivecor is alleging that Apple, of Cupertino, Calif., has infringed on Alivecor patents for electrocardiogram monitoring technology, a development that may foreshadow a continuing legal struggle between the two companies for a large and rapidly growing market.