Patients will be recruited from the surgical population undergoing preoperative evaluation in Anesthesiology Preoperative Evaluation Clinic at Hershey Med. Ctr. (\~15,000 per year). Selected patients (ASA 1-3, N=60) with history of severe PONV after one or more of previous general anesthesia, and scheduled to undergo surgical procedures with general anesthesia will be enrolled into IRB approved protocol. The patch will be placed by the patient at home 24 - 48 hours before surgery as directed by the doctor. The subsequent standardized general anesthesia protocol for elective surgery will include general endotracheal anesthesia with sevofluran, including standard intraoperative PONV prophylaxis (IV dexamethasone and IV ondansetron, each 4 mg). Postoperative evaluation will include recording of incidence and severity of PONV at the time of discharge from PACU (acute PONV), at 24 hr, 48 hrs, 72 and 120 hrs (delayed or post discharge PONV).
7.2.1 Visit 1 - Anesthesia Preoperative Evaluation Clinic and recruitment and drug dispensation Patient is seen in clinic and identified as having a history of serious PONV, in particular delayed or post discharge PONV. Study will be explained to the patient and consent obtained. The investigational pharmacy will be notified that a study patient has been enrolled and they will prepare the patches for distribution to the patient.
A member of the research team will obtain the assigned patches from the investigational pharmacy and deliver to the anesthesia provider (member of the research team).
The provider will then demonstrate to the patient how to apply the patch and the patient can practice using a placebo patch to show that the correct placement. Patient will then take the actual patch home with them.
7.2.2 Visit 2 - approximately 24-48 hours preoperatively (patient's home) Patient will apply the patch to their upper arm 24-48 hours before scheduled surgical procedure, as instructed during their pre-op anesthesia visit. The patch will then remain in place until 120 hours after surgical procedure. No backup patch will be provided so the patients with the accidently missing patch will need to call their primary surgical service for the standard antiemetic medication.
7.2.3 Visit 3- Day of Surgery Patient will arrive for surgery. A member of the research team will meet them in the SDU and record the time that the patch was applied, and if it has been placed correctly, intact and still in place. Any potential side effects (systemic or local) will be recorded at that time. The subsequent standardized general anesthesia protocol for elective surgery will include general endotracheal anesthesia with sevofluran (no nitrous oxide), muscle relaxants (with reversal), intraoperative IV opioid analgesics, including standard PONV prophylaxis (dexamethasone and ondansetron IV 4 mg).
Early postoperative evaluation will include recording of incidence and severity of PONV at the time of discharge from PACU (acute PONV). The incidence of vomiting or retching will recorded by the nursing staff. Patients with symptoms requiring a rescue antiemetic-nausea score ≥4 on an 11-point Numeric Rating Scale (NRS), retching or vomiting, or patient request-within 6 hours of PACU admission will be given the rescue medication (Benadryl or promethazine). The NRS was an 11-point linear scale on which patients rated their nausea, with 0 meaning no nausea and 10 meaning the worst possible nausea.
The subsequent evaluations will be performed either at the patient's bed (if in the hospital) or by phone call at 24 hr, 48 hrs, 72 and 120 hrs (delayed or post discharge PONV). The patient will be supplied with a diary to record the information that will be requested on the follow-up phone calls.
The primary efficacy endpoint will be complete response (CR), defined as no emetic episode and no rescue medication; the proportions of patients with no emesis and no additional rescue medication in the 120 hours following the completion of surgical procedure and the change from baseline nausea score using the NRS. Treatment-emergent adverse events (TEAEs), regardless of suspected causal relationship to the study medication, will be also recorded throughout and continued until 5 days after surgery.
7.3 Duration of Participation Patient will remain in the study until all time points have been met (maximum 5 days following surgery or 120 hours). At the end of the study the patient will remove and dispose the remaining patch.
