If an application for review is made to the Commission within twenty days from the date of a determination pursuant to subdivisions A 1 through A 3 of § 38.2-5008, or within twenty days from the date of an award by the Commission pursuant to § 38.2-5009, the full Commission, excluding any member of the Commission who made the determination or award, if the first hearing was not held before the full Commission, shall review the evidence. If deemed advisable and as soon as practicable, the Commission instead may hear the parties, their representatives and witnesses and shall make a determination or award, as appropriate. Such review or determination, together with a statement of the findings of fact, rulings of law and other matters pertinent to the questions at issue, shall be filed with the record of the proceedings and shall be sent immediately to the parties.