Enhanced recovery surgical principles were first described in the 1990s.1 These principles postulate that the body’s stress response to surgical injury and deviation from normal physiology is the source of postoperative morbidity. Thus, enhanced recovery programs are designed around perioperative interventions that mitigate and help the body cope with the surgical stress response.
Many of these interventions run counter to traditional perioperative care paradigms. Enhanced recovery protocols are diverse but have common themes of avoiding preoperative fasting and bowel preparation, early oral intake, limiting use of drains and catheters, multimodal analgesia, early ambulation, and prioritizing euvolemia and normothermia. Individual interventions in these areas are combined to create a master protocol, which is implemented as a bundle to improve surgical outcomes.
Dr. Paola A. Gehrig
Current components
Minimizing preoperative fasting, early postoperative refeeding, and preoperative carbohydrate-loading drinks are all key aspects of enhanced recovery protocols. “NPO after midnight” has been a longstanding rule due to the risk of aspiration with intubation. However, a Cochrane review found no evidence that a shortened period of fasting was associated with an increased risk of aspiration or related morbidity. Currently, the American Society of Anesthesiologists recommends only a 6-hour fast for solid foods and 2 hours for clear liquids.2,3
Preoperative fasting causes depletion of glycogen stores leading to insulin resistance and hyperglycemia, which are both associated with postoperative complications and morbidity.4 Preoperative carbohydrate-loading drinks can reverse some of the effects of limited preoperative fasting including preventing insulin resistance and hyperglycemia.5
Postoperative fasting should also be avoided. Early enteral intake is very important to decrease time spent in a catabolic state and decrease insulin resistance. In gynecology patients, early refeeding is associated with a faster return of bowel function and a decreased length of stay without an increase in postoperative complications.6 Notably, patients undergoing early feeding consistently experience more nausea and vomiting, but this is not associated with complications.7
The fluid management goal in enhanced recovery is to maintain perioperative euvolemia, as both hypovolemia and hypervolemia have negative physiologic consequences. When studied, fluid protocols designed to minimize the use of postoperative fluids have resulted in decreased cardiopulmonary complications, decreased postoperative morbidity, faster return of bowel function, and shorter hospital stays.8 Given the morbidity associated with fluid overload, enhanced recovery protocols recommend that minimal fluids be given in the operating room and intravenous fluids be removed as quickly as possible, often with first oral intake or postoperative day 1 at the latest.
Dr. Emma L. Barber
Engagement of the patient in their perioperative recovery with patient education materials and expectations for postoperative tasks, such as early refeeding, spirometry, and ambulation are all important components of enhanced recovery. Patients become partners in achieving postoperative milestones, and this results in improved outcomes such as decreased pain scores and shorter recoveries.
Evidence in gynecology
Enhanced recovery has been studied in many surgical disciplines including urology, colorectal surgery, hepatobiliary surgery, and gynecology. High-quality studies of abdominal and vaginal hysterectomy patients have consistently found a decrease in length of stay with no difference in readmission or postoperative complication rates.9 An interesting study also found that an enhanced recovery program was associated with decreased nursing time required for patient care.10
For ovarian cancer patients, enhanced recovery is associated with decreased length of stay, decreased time to return of bowel function, and improved quality of life. Enhanced recovery is also cost saving, saving $257-$697 per vaginal hysterectomy patient and $5,410-$7,600 per ovarian cancer patient.11
Enhanced recovery protocols are safe, evidenced based, cost saving, and are increasingly being adopted as clinicians and health systems become aware of their benefits.
References
1. Br J Anaesth. 1997 May;78(5):606-17.
2. Cochrane Database Syst Rev. 2003 Oct 20;(4):CD004423.
3. Anesthesiology. 1999 Mar;90(3):896-905.
4. J Am Coll Surg. 2012 Jan;214(1):68-80.
5. Clin Nutr. 1998 Apr;17(2):65-71.
6. Cochrane Database Syst Rev. 2007 Oct 17;(4):CD004508.
7. Obstet Gynecol. 1998 Jul;92(1):94-7.
8. Br J Surg. 2009 Apr;96(4):331-41.
9. Obstet Gynecol. 2013 Aug;122(2 Pt 1):319-28.
10. Qual Saf Health Care. 2009 Jun;18(3):236-40.
11. Gynecol Oncol. 2008 Feb;108(2):282-6.
Dr. Gehrig is professor and director of gynecologic oncology at the University of North Carolina at Chapel Hill. Dr. Barber is a third-year fellow in gynecologic oncology at the university. They reported having no financial disclosures relevant to this column. Email them at obnews@frontlinemedcom.com.