Prevention of Postoperative Nausea and Vomiting (PONV) in Surgical Patients (PONV)
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Treatment
|Official Title:||Prevention of Postoperative Nausea and Vomiting in Surgical Patients|
- Incidence of Postoperative Nausea and Vomiting [ Time Frame: Post-operative Care Unit (PACU) length of stay on day of surgery (time from end of surgery to transfer to discharge unit or other hospital unit) ] [ Designated as safety issue: No ]The incidence of postoperative nausea (PON) and postoperative vomiting (POV) was assessed during Post-operative Care Unit (PACU) stay.
- Maximum Reported Post-Operative Nausea Scores on Visual Analog Scale (VAS) Scale [ Time Frame: Post-operative Care Unit (PACU) stay from end of surgery to transfer to ambulatory unit ] [ Designated as safety issue: No ]
VAS Scale: 0=no nausea, 1-3=mild nausea, 4-6= moderate nausea, 7-9= severe nausea, 10=extreme nausea usually accompanied with vomiting.
VAS nausea score were obtained every 30 min from entry into post-operative care unit (PACU) for first 2 hrs. and then hourly until time of transfer out of PACU.
- Post-operative Nausea and Vomiting (PONV) Incidence 24-48 Hours Post Surgery [ Time Frame: 24-48 hrs post surgery ] [ Designated as safety issue: No ]Participants were queried for presence of postoperative nausea (PON) or postoperative vomiting (POV) during the 24-48 hr window post surgery.
- Post-Operative Care Unit Length of Stay (Min) [ Time Frame: Day of surgery (time from end of surgery to transfer to ambulatory pre-discharge unit or other unit) ] [ Designated as safety issue: No ]Length of time in PACU (minutes) measured from end of surgery to time of transfer to ambulatory care prior to home discharge or time to hospital admission if applicable.
- Post-Surgery Hospital Admissions (All Cause) After Out-patient Abdominal Procedure [ Time Frame: Post-operative Day of Surgery (DOS) ] [ Designated as safety issue: No ]Number of all-cause hospital admissions on day of elective out-patient surgery .
- Post-operative Antiemetic Use [ Time Frame: End of surgery to 48 hr post surgery ] [ Designated as safety issue: No ]Percentage of participants requiring post-operative anti-emetic medications.. Anti-emetic medication need was assessed during a) post-operative care unit (PACU) stay and b)during the first 48 hrs. following discharge from PACU to home or if applicable to in-patient unit.
- Patient Satisfaction: Willingness to Take Pre-operative Medication for Post-operative Nausea and/or Vomiting [ Time Frame: Post operative follow up interviews 24 hrs to 6 wks ] [ Designated as safety issue: No ]Percent of participants who responded that they would be willing to take preemptive medication for nausea and vomiting for subsequent surgeries when queried during post-operative follow-up interviews at 24-48 hrs or 2-6 weeks.
- Patient Satisfaction 2: Willingness to Pay Extra Money for Post-Operative Nausea and Vomiting (PONV) Preventive Medication [ Time Frame: Post-operative follow-up interviews 24 hr to 6 weeks post surgery ] [ Designated as safety issue: No ]Percent of participants willing to pay extra money for preemptive medication for PONV for subsequent surgical procedures when queried at post-operative 24-48 hr. and at 2-6 wk. follow-up interviews.
|Study Start Date:||December 2009|
|Study Completion Date:||April 2015|
|Primary Completion Date:||December 2013 (Final data collection date for primary outcome measure)|
Experimental: Arm 1
Dronabinol (5mg) will be administered orally (p.o.) 20-60 min pre-operatively.
Other Name: Marinol
Active Comparator: Arm 2
Ondansetron (4mg) will be administered intravenously (iv) intraoperatively in those patients not receiving Dronabinol.
Other Name: Zofran
Anesthesia has become remarkably safe during the past two decades, yet postoperative nausea and vomiting (PONV) continues to be a vexing problem with an unacceptably high incidence. Multiple factors including age, gender, type of surgery and anesthetic agents, perioperative opioid use and duration of anesthesia have been implicated in the cause of PONV. Several new drugs have been introduced during the last two decades to minimize PONV; however the incidence still remains significantly high, ranging from 30% during the first 24 postoperatively to 35% post discharge. Unrelenting PONV results in delayed discharge which is particularly significant after outpatient surgery. The proposed study will examine the anti-emetic properties of orally administered dronabinol given immediately prior to surgery with standard of care intravenous ondansetron given at the end of a surgical procedure in an effort to assess the need for cost effective prophylaxis of PONV.
The chemoreceptor trigger zone (CTZ) functions as emetic chemoreceptor for the vomiting centers. Many antiemetic drugs acting at the level of the CTZ are responsible for vomiting in patients receiving chemotherapy and postoperative patients. Our regimen of oral dronabinol has been proven to reduce the incidence of PONV in patients receiving chemotherapy. We intend to prove that a regimen that has been utilized in patients receiving chemotherapeutic drugs will work in patients with a high risk for developing PONV following surgery. We hypothesize that a regimen of preoperative low dose of dronabinol is superior in efficacy to a standard antiemetic in preventing the incidence of PONV, and thus will not only improve patient satisfaction but will also reduce length of stay in patients undergoing outpatient surgery.
- Reduction of postoperative and postdischarge nausea and vomiting in ambulatory surgery patients.
- Reduce rate of hospital admissions and length of inpatient stay after outpatient surgery.
- Improve patient satisfaction after outpatient surgery.
Procedure After informed consent, surgical patients scheduled for outpatient abdominal surgery at the Central Arkansas Veterans Healthcare System (CAVHS) who are at high risk for developing PONV following their procedure will be randomized to receive either the study drug ( preoperative oral dronabinol-5 mg) or standard therapy ( 4 mg ondansetron intravenously at the end of surgery). The outcome measures will be the presence or absence of PONV, the severity and number of such episodes, the event count of rescue antiemetic use and patient satisfaction. All data will be recorded by personnel who are blinded to the drug regimen.
At CAVHS, 2/3 of our patients are scheduled for outpatient surgical procedure everyday. Our regimen will minimize postoperative and postdischarge nausea and vomiting, improve post-operative care unit (PACU) length of stay, minimize unnecessary hospital admissions, provide patient satisfaction and cost containment. The potential for application of this inexpensive intervention to other surgeries is enormous. Reducing the incidence of PONV could have a significant impact on patient satisfaction. The intervention is very low-risk, efficacious, and could substantially impact on the experience and the outcome of the Veteran undergoing surgery.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00757822
|United States, Arkansas|
|Central Arkansas Veterans Healthcare System-John L McClellan Memorial Veterans Hospital|
|Little Rock, Arkansas, United States, 72005|
|Study Director:||Sue A Theus, PhD||Central Arkansas Veterans Healthcare System|