(a) A living will may be revoked at any time and in any manner by the declarant, without regard to the declarant's mental or physical condition.
(b) The attending physician or other health care provider shall make the revocation a part of the declarant's medical record.
(c) In the absence of knowledge of the revocation of a living will, a person is not subject to civil or criminal liability or discipline for unprofessional conduct for carrying out the living will pursuant to the requirements of sections 19a-570 , 19a-571 , 19a-573 and 19a-575 to 19a-580c , inclusive.