 1. Methods of enrollment, including procedures for patient registration Patients will be screened in the Cardiac surgery pre-operative clinic, Massachusetts General Hospital MGH Cox building floor 6 before surgery. If the patient is eligible and after obtaining the consent of the primary cardiac surgeon, the patient will be approached the patient for consent to participate in this clinical trial. Consent will be obtained exclusively from the patient, and not from a surrogate, because cardiac surgery is usually a scheduled procedure. The obtaining of the consent directly from the patient is preferred, since there will be the opportunity of interaction with the patient when heshe is fully awake. After consent is obtained, the patient will be randomized to the study group. A de-identified code will be assigned to the patient and registered on a dedicated enrollment log. 