W. Va. Code § 23-5-12a
(b) The Intermediate Court of Appeals shall set a time and place for the hearing of arguments on each claim and shall notify the interested parties thereof. The review by the court shall be based upon the record submitted to it and such oral argument as may be requested and received. The Intermediate Court of Appeals may affirm, reverse, modify, or supplement the decision of the Workers’ Compensation Board of Review and make such disposition of the case as it determines to be appropriate. Briefs may be filed by the interested parties in accordance with the rules of procedure prescribed by the court. The Intermediate Court of Appeals may affirm the order or decision of the Workers’ Compensation Board of Review or remand the case for further proceedings. It shall reverse, vacate, or modify the order or decision of the Workers’ Compensation Board of Review, if the substantial rights of the petitioner or petitioners have been prejudiced because the Board of Review’s findings are:
(c) After a review of the case, the Intermediate Court of Appeals shall issue a written decision and send a copy by mail to the parties.