(a) General rule.--If the spouse of a principal is designated as the principal's health care agent and thereafter either spouse files an action in divorce, the designation of the spouse as health care agent shall be revoked as of the time the action is filed unless it clearly appears from the advance health care directive that the designation was intended to continue to be effective notwithstanding the filing of an action in divorce by either spouse.
(b) Construction.--A revocation under this section shall not be construed to invalidate an advance health care directive unless its terms expressly direct otherwise.