(a) A living will may be revoked at any time by the declarant, without regard to his mental state or competency, by any of the following methods:

(1) By being canceled, defaced, obliterated, burnt, torn, or otherwise destroyed by the declarant or by some person in his presence and by his direction;

(2) By the declarant or a person acting at the direction of the declarant signing and dating a written revocation expressing the intent of the declarant to revoke. In order to be effective, such a written revocation must clearly express an intention to revoke a living will as opposed to a will or wills relating to the disposition of property after death; and without limiting the generality of the foregoing, it is specifically provided that the revocation clause which is customarily included in a will relating to the disposition of property and which provides for the revocation of "all other wills" of the testator shall not operate to revoke a living will without further evidence of a specific intent to revoke the living will. Such revocation shall become effective only upon communication to the attending physician by the declarant or by a person acting at the direction of the declarant. The attending physician shall record in the patient's medical record the time and date when he received notification of the written revocation; or

(3) By any verbal or nonverbal expression by the declarant of his intent to revoke the living will. In order to be effective, such an oral revocation must clearly express an intention to revoke a living will as opposed to a will relating to the disposition of property after death. Such revocation shall become effective only upon communication to the attending physician by the declarant or by a person acting at the direction of the declarant. The attending physician shall record in the patient's medical record the time, date, and place of the revocation and the time, date, and place, if different, when he received notification of the revocation.

(b) Any person who participates in the withholding or withdrawal of life-sustaining procedures pursuant to a living will, as authorized by this chapter, which person has actual knowledge that such living will has been properly revoked, shall not have any civil or criminal immunity otherwise granted under this chapter for such conduct.