The court in its discretion, on a showing of good cause, may issue a temporary order prescribing the health care of the patient until the disposition of the petition filed under Section 4766. If a power of attorney for health care is in effect and a conservator (including a temporary conservator) of the person is appointed for the principal, the court that appoints the conservator in its discretion, on a showing of good cause, may issue a temporary order prescribing the health care of the principal, the order to continue in effect for the period ordered by the court but in no case longer than the period necessary to permit the filing and determination of a petition filed under Section 4766.