Clinical Application and Research Progress of Accelerated Rehabilitation Surgery in Perioperative Period of Advanced Gastric Cancer in the Elderly

Enhanced recovery after surgery (ERAS) has been used in various surgical professions in recent years and is widely accepted by doctors. This concept not only helps patients speed up postoperative recovery, reduce the incidence of related complications and shorten hospital stays, but also has been proved to be effective and safe in the perioperative application of gastric cancer. This article reviews the clinical application and research progress of enhanced recovery after surgery in the perioperative period of advanced gastric cancer in the elderly.

higher [3], because the clinical symptoms of early gastric cancer are not obvious, patients often do not pay enough attention. In addition, due to the lack of effective methods for early screening of gastric cancer, the detection rate of early gastric cancer is only about 10% [4]. Has entered the advanced stage, so surgery is currently recognized as the best treatment.
In China, in recent years, the population structure tends to be aging, the proportion of the elderly (>60 years old) is increasing, and the corresponding elderly patients are gradually increasing. As the body immunity of the elderly declines, the adaptability to the internal and external environment decreases. Often combined with chronic diseases, such as hypertension, diabetes, heart disease, etc. [5], the tolerance and resilience to surgery and its postoperative decline, prone to a series of complications, and even life-threatening. How to reduce stress response and speed up postoperative recovery is a hot and difficult point.
Based on evidence-based medicine, ERAS is a multidisciplinary collaboration that reduces post-stress and accelerates postoperative recovery. It was first proposed by Danish surgeon Kehlet et al. [6] in 1997 and in China by 2007. Professor Zhiwei's application in gastric cancer [7] has been widely used in various surgical fields. This concept runs through preoperative, intraoperative and postoperative operations. The focus is on preoperative consultation, optimized nutrition, standardized analgesia, and reduction. The use of opioids to minimize electrolyte and fluid imbalances and promote early activity and feeding [8]; there is clear evidence [9] [10] that accelerating rehabilitation surgery is safe and effective for elderly patients, supporting accelerated surgical surgery applications. In elderly patients, this article reviews the clinical application and research progress of accelerated rehabilitation surgery in elderly patients with advanced gastric cancer during gastric surgery.

Application of Eras in Perioperative Period of Advanced
Gastric Cancer in the Elderly

Preoperative Communication and Consultation
Before surgery, the patient physiologically responds to stress. The central nervous system mediates this process, producing stress hormones and inflammatory mediators [11], and strengthens effective communication with patients before surgery. It can be written and spoken. The above agreement provides individualized counseling to patients and psychologically prepares them for what they are doing, thereby reducing the anxiety and fear of patients, improving recovery, improving patient compliance with the plan, and promoting eating. Early exercise, pain control and respiratory function, reduce the occurrence of complications [8] [12]; for elderly patients, often combined with chronic diseases, to actively treat diseases that affect the recovery of patients, such as hypertension, diabetes, blood pressure Achieve a stable state with blood glucose before surgery, and actively improve nutrition for malnourished patients, so that the patient's International Journal of Clinical Medicine body reaches an optimal state before surgery.

Preoperative Nutritional Improvement
For elderly patients with gastric cancer, often combined with malnutrition, is the main clinical problem of gastrointestinal malignant tumors, malnutrition in hospitalized patients reached 50% -60%, up to 71% in cancer patients [13]; malnutrition led to hospitalization Prolonged time, increased postoperative complications, slow recovery of postoperative bowel function, high readmission rate, high postoperative mortality; evidence [14], preoperative nutritional status is a key determinant of optimal outcome in gastrointestinal surgery avoid preoperative fasting before surgery, optimize preoperative nutrition, oral nutritional supplements and immunonutrient preparations; Sonvi research shows [15], preoperative oral immunonutrition preparations, postoperative complications are lower, it is recommended that all preoperative The patient underwent 5 to 7 days of on-site immunonutrition [16].

Gastrointestinal Preparation
Inadequate mechanical bowel preparation before surgery has been shown to cause dehydration and imbalance of fluids and electrolytes, especially in elderly patients. Mechanical bowel preparation is to remove solid excretion from the large intestine and reduce the amount of bacteria. Liquefaction of feces increases the risk of surgical spillage [8]; there is no need to fast for one night before surgery. The current guidelines recommended by the American Society of Anesthesiologists [17], fasting solid foods 8 hours before surgery, 2 hours before the ban According to the Cochrane study [18], the risk and incidence of inhalation were not increased compared with traditional requirements; prolonged fasting (>12 h) resulted in hypovolemia, increased metabolic stress and insulin resistance, insulin resistance It is a key factor for long-term rehabilitation and increased morbidity; a data suggest that [19], decreased insulin sensitivity, will lead to increased complication rate, postoperative hyperglycemia, increased risk of postoperative infection by 30%; 2 -3 day before surgery Drinking 300 -400 ml of carbohydrates a day can not only reduce pre-operative thirst, hunger, anxiety and postoperative insulin resistance, but also reduce postoperative nitrogen and protein loss, better maintain capacity and muscle mass, and exhaust time. With hospitalizationShortening, however, for patients with diabetes and delayed gastric emptying, gastrointestinal motility disorders with the exception of patients [8].

Gastrointestinal Decompression Tube
The nasogastric tube is not routinely used. According to the Cochrane conclusion [18], the nasogastric tube is not routinely used, the pulmonary complications are significantly reduced, the early feeding is improved, and the hospital stay is shortened. The use of the nasogastric tube has a certain effect on the nasopharyngeal mucosa. The stimulation, which leads to increased complications in the pharynx and lungs, also exerts pressure on the patient's psychology, and International Journal of Clinical Medicine also has an effect on the patient's early bed-out activities; a randomized trial [20], no patients who received the nasogastric tube, there was no difference in postoperative nausea, vomiting, and recovery of bowel function.

Intraoperative Anesthesia
The anesthesia program will promote the recovery of gastrointestinal motility and is the key to speeding up recovery. For elderly patients, the anesthesia should be avoided too deeply, and the depth of anesthesia is bis < 45, not only to minimize the anesthetic, but also to prevent convulsions, promote rapid arousal and recovery [21]; anesthesia is a stress response that limits surgery to fluid balance and pain [22]; intraoperative intravenous anesthesia combined with epidural anesthesia, anesthesia induction and continuous anesthesia are generally selected for short-acting anesthetics (propofol, cis Lacurium, fentanyl, to reduce sympathetic nerve stimulation and postoperative anesthesia, combined anesthesia combined with general anesthesia onset, intraoperative anesthesia and epidural anesthesia can promote postoperative gastrointestinal function recovery, postoperative analgesia The advantages can not only achieve the desired anesthetic effect, but also accelerate the recovery of patients after surgery, inhibit the occurrence of postoperative intestinal paralysis, accelerate the recovery of gastrointestinal function, and provide conditions for early postoperative feeding [21].

The Use of Preventive Antibiotics
The use of prophylactic antibiotics can reduce the incidence of postoperative infections; studies have shown [23] that prophylactic antibiotics are effective against possible anaerobic and aerobic infections, 30 minutes to 1 hour before skin incision Dosage can be administered repeatedly according to the half-life of the drug and the operation time during the operation.

Surgical Operation
The safety and efficacy of laparoscopic radical gastrectomy have been confirmed [24]; there is evidence [14] that laparoscopic surgery can reduce trauma, reduce intraoperative blood loss, and reduce surgical stress response compared with conventional laparotomy Postoperative pain and discomfort, postoperative intestinal adhesions, low incidence of intestinal obstruction, early recovery of bowel function, reduced hospital stay, and a high degree of synergy with eras.

Liquid Management
Liquid management is an important part of eras. It can maintain normal blood volume by pre-operative, intraoperative and postoperative methods. Whether it is a large amount of infusion or a limited amount of infusion, it can significantly impair organ function and will increase postoperative complications (P < 0.05). Symptoms and prolonged hospital stay [25]; there is evidence [8], a large number of fluid replacement, delayed recovery of gastrointestinal function, wound healing and anastomotic healing, affecting tissue oxygenation, leading to prolonged hospital stay; intraoperative fluid management is maintained There is sufficient circulation at the end of the organ, low blood volume leads to hypoperfusion, increased risk of organ failure, high blood volume leads to peripheral and pulmonary edema, and the incidence of postoperative intestinal obstruction increases [18]; intraoperative fluid should be zero-balanced For the purpose of high-risk patients or large-scale abdominal surgery should be targeted to use liquid therapy, using objective parameters, according to hemodynamics, such as cardiac output, pulse pressure changes, etc., to make patients' fluid recovery more accurate, reduce postoperative bowel Obstruction occurs, promote the recovery of bowel function, thereby reducing hospital stay [26]; postoperative, early oral fluid, limiting postoperative intravenous rehydration, can reduce hospital stay, reduce concurrency, Such as the occurrence of intestinal obstruction [8].

Intraoperative Temperature
In gastric cancer surgery, due to anesthesia leading to abnormal body temperature regulation, a large number of infusions, and prolonged exposure to the wound, cold water flushing the abdominal cavity, often lead to hypothermia, especially in elderly patients [7]; According to studies [8], maintaining a normal body temperature can reduce wound infections and heart complications. bleeding and blood transfusion requirements, shorten postoperative recovery time; it is recommended to use room temperature at 24˚C, through the upper body forced air heating, insulation blanket, heated intravenous infusion, warm water to wash the abdominal cavity and other measures to make the patient's body temperature Keep at around 36˚C to avoid complications and improve intraoperative and postoperative safety [27].

Drainage Tube
Abdominal drainage tube should not be used routinely. Abdominal drainage tube does not reduce the incidence of complications, but increases the risk of infection and postoperative fistula [28]; a rct experiment shows [29], two groups in wound infection and there was no significant difference in postoperative pus.
The incidence of postoperative complications and hospitalization time were lower in the non-drainage group; if it was in some special cases, such as anastomotic blood supply, cancerous ascites, weak constitution, nutritional status If the difference is poor, the drainage tube should be placed according to the intraoperative condition. The amount and nature of the drainage fluid should be closely observed after operation, and the tube should be extubated as soon as possible to reduce the tube stimulation and complications.

Multimodal Analgesia
Postoperative multimodal analgesia, preventive analgesia, the purpose of early mobilization, promote the recovery of gastrointestinal function; multimodal analgesia is the use of more than one pain control mode to achieve effective analgesia, including systemic administration, Regional, epidural analgesia, axonal pattern, and a variety of drugs designed to reduce the use of opioids and reduce the side effects caused by opioids; opioids cause intestinal obstruction, respiratory depression, causing nausea, vomiting, especially in the elderly Large doses of opioids increase the risk [30]; multimodal analgesia also incorporates prophylactic analgesia, which is the treatment of pre-drugs that reduce pain or pain before surgery. It has been shown to reduce pain, inflammation, nausea, vomiting [31]; effective pain control is the basis for early bed-out activities, gastrointestinal recovery, and multi-mode combined analgesia is effective, not only reduces the occurrence of related complications, but also promotes early stage Bed activity, shortened hospital stay.

Early Diet
Early (<24 h) diet accelerated recovery of gastrointestinal function, reduced complication rate and mortality, and contributed to wound healing and anastomotic strength, which has been shown to be safe [16] [32]; 6 -24 h began to take a small amount of warm boiled water, if the patient does not have discomfort such as bloating, the next day after surgery, gradually overdue from a fluid diet to a normal diet; early return to a normal diet, that is, provide the corresponding energy and protein, and can reduce the cause of hunger Insulin resistance [8]; according to Carr et al. [18], intestinal mucosal permeability was not increased in patients receiving early feeding; RCT experiments performed according to EINakeeb et al. [33], early diet promotes intestinal function Recover, reduce intestinal edema, shorten the time of exhaust and stool, reduce the risk of various forms of infection, thereby shortening the length of hospital stay, and recommend early diet.

Prevention of Nausea and Vomiting
25% -35% of patients have postoperative nausea and vomiting. By administering prophylactic antiemetic drugs, 40% of postoperative nausea and vomiting can be reduced. Patients should be advised to give preventive antiemetic drugs [12] in advance; prevention of nausea and vomiting More meaningful than analgesia, reduce the risk of anastomotic leakage, promote early feeding, early bed-out activities; prevent postoperative nausea and vomiting, can be given dexamethasone sodium phosphate at the beginning of surgery or serotonin antagonism at the end of surgery Agent [8].

Venous Thrombosis Prevention
A common complication of venous thromboembolism, a higher incidence in elderly patients, but effective prevention strategies, including pharmacological or non-pharmacological aspects, can significantly reduce the incidence; for patients with epidural analgesia, should Careful use of antithrombotic drugs, before the use of low molecular weight heparin, needle should be introduced, the catheter should be taken at the lowest point of drug action (before the next scheduled dose), the subsequent dose should be given at least 2 hours after extubation, for Patients with a body mass index (>30) should consider using higher doses of low molecular weight heparin [33].

Catheter
The urinary catheter should be pulled out as soon as possible after the operation, and pulled out on the first or second day after surgery to promote the patient to get out of bed early after surgery, without increasing the incidence of urinary tract infection, but pay attention to patients with benign prostatic hyperplasia, uterus Patients with a history of resection and cesarean section need to strengthen the frequency of observation after surgery. When patients have urinary dysfunction, they should be treated in time [6].

Get out of Bed Early
Long-term bed rest can lead to atelectasis, insulin resistance, thromboembolism, decreased exercise capacity, and in the case of effective analgesia, it is possible to get out of bed early; it is recommended to start appropriate activities the next day after surgery. It not only reduces related complications, but also promotes intestinal function recovery, strengthens blood circulation, promotes wound healing, and shortens hospital stay [12].

Summary and Outlook
The clinical application of accelerated rehabilitation surgery in perioperative period of elderly gastric cancer has been proved to be safe and effective, reducing stress response and postoperative complications, improving postoperative nutritional status, speeding up recovery, shortening hospital stay and reducing costs.
However, there is still little evidence on how eras can benefit patients in the long term [8]; for the application of accelerated rehabilitation surgery, it is not possible to generalize the application of individualized conditions; the current clinical application of accelerated rehabilitation surgery still exists. The challenge is that the surgeon is accustomed to the traditional concept and lacks understanding of the eras. Second, the lack of effective communication between the doctor and the patient leads to insufficient compliance and compliance. The third is to accelerate the lack of standardization in rehabilitation surgery, and some aspects are still controversial. Lack of evidence to enable surgeons to obtain effective guidance in application; fourth, accelerating rehabilitation surgery is a multi-disciplinary collaboration, including anesthesia, nursing, etc., which leads to difficulties in application; I believe that the concept of accelerated rehabilitation surgery will continue to improve in the future. And development, widely used to benefit patients.