Abstract
Enteral nutrition has been reported to be safe and effective in malnourished patients undergoing upper gastrointestinal surgery. In this study, we devised night home enteral nutrition (N-HEN) as a novel nutritional strategy and evaluated the efficacy in gastric cancer patients following total gastrectomy. Between January 2017 and March 2021, 24 patients were prospectively included in the protocol and supported by N-HEN for three postoperative months through a jejunostomy during the night (Elental:1200 kcal/day), and 22 patients without N-HEN were followed as a control group (CG). Body weight loss, nutritional indicators and tolerance to chemotherapy were evaluated. After 3 and 6 months, patients with N-HEN had significantly less body weight loss than CG (3 months P < 0.0001: N-HEN 4.0% vs. CG 15.2%, 6 months P < 0.0001: N-HEN 7.7% vs. CG 17.7%). Prealbumin was significantly higher in patients with N-HEN than CG after 3 and 6 months (3 months P < 0.0001, 6 months P = 0.0037). Albumin, total protein and hemoglobin, tended to be higher after 3 and 6 months in patients with N-HEN than CG, and total cholesterol after 6 months. Concerning the tolerance to adjuvant chemotherapy in Stage II–III patients, patients with N-HEN significantly had a higher completion rate (P = 0.0420: N-HEN 70% vs. CG 29%) and longer duration (P = 0.0313: N-HEN 458 days vs. CG 261 days) as planned. Continuous monitoring of blood glucose concentration in patients with N-HEN did not show nocturnal hypoglycemia or hyperglycemia. N-HEN could be a novel enforced and physiologically effective nutritional strategy to support potentially malnourished patients following total gastrectomy.
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Introduction
Weight loss and malnutrition are pivotal issues in gastric cancer patients following gastrectomy, particularly in total gastrectomy. Previous clinical trials have described a weight loss of about 20% within 6 months following total gastrectomy1. Weight loss is the most distinctive sign of malnutrition, and there is considerable evidence that postoperative malnutrition results in the promotion of protein catabolism and delayed wound healing, and is an independent factor of higher complications and poor prognosis2,3,4,5. The reason is that most patients can achieve at best 65–70% of the required calories via oral intake at discharge following upper gastrointestinal cancer (GI) surgery6 because postoperative patients suffer from poor QOL and appetite loss due to the decrease of ghrelin secretion7.
Specifically, poor postoperative QOL is associated with decreased physical function and symptoms such as appetite loss, vomiting, fatigue and reduced willingness to do something/to exert effort8,9,10,11. Because of these, a significant proportion of patients cannot complete adjuvant chemotherapy12,13 and, thus, poor QOL has been reported to be an independent negative prognostic factor for cancer or non-cancer death14,15.
Therefore, to improve weight loss and malnutrition due to postoperative physical status and symptoms, establishing an ideal nutritional support program after discharge is imperative. However, until now, there has been a lack of consensus regarding the optimal nutritional support program following gastrectomy, particularly in total gastrectomy. In 2019, ESPEN developed the first guidelines on home enteral nutrition (HEN)16, which focused on methodology and clinical practice. Although the guidelines describe indications for HEN and includes GI cancer patients at risk of malnutrition, the exact impact and practical ingenuity of HEN is yet to be elaborated.
In this study, we devised night home enteral nutrition (N-HEN) as a novel enforced nutritional strategy and evaluated the efficacy. Because N-HEN is performed during the night, it does not impair the daily activity or oral intake. It is also a physiologically ideal method for nutrient absorption by the analysis using continuous glucose monitoring. Our results may provide evidence that N-HEN could be a novel and ideal nutritional strategy to support potentially malnourished patients following total gastrectomy.
Patients and methods
Patients
The study was approved by the institutional review board of Kyoto First Red Cross Hospital (KFRCH 1219), and each subject provided written informed consent based on the Declaration of Helsinki. Patients underwent preoperative assessments including gastric endoscopy, endoscopic ultrasonography, computed tomography (CT) scans, and laboratory tests. The patients enrolled in this study had been histologically confirmed as having gastric cancer and were diagnosed as Stage I–III gastric cancer. Between January 1, 2017 and March 31, 2019, 52 consecutive patients underwent curative total gastrectomy with lymphadenectomy. Of these, 14 patients were retrospectively enrolled between January 1, 2017 and August 31, 2017 and did not use N-HEN, and the remaining 38 patients were prospectively enrolled between September 1, 2017 and March 31, 2019. Prior to surgery, N-HEN was recommended to all 38 prospectively enrolled patients by explaining both its putative merits and demerits. Twenty-six patients hoped to use N-HEN, and 12 patients refused. As a result, of 52 patients, 26 patients belonged to the N-HEN group, and 26 patients belonged to the control group (CG). To evaluate the secure nutritional outcomes, in the N-HEN group, one recurrent patient within 6 months and one patient who developed another cancer within 6 months were removed. In CG, two non-cancer death patients due to acute myocardial infarction and aspiration pneumonia within 6 months and two recurrent patients within 6 months were removed. Finally, 24 patients as an N-HEN group and 22 patients as a CG were included for further analyses (Fig. 1).
Surgical procedures for total gastrectomy and jejunostomy feeding tube
All procedures for total gastrectomy are described elsewhere17 and were performed mainly by qualified surgeons who were certified by the Japanese Society of Endoscopic Surgery18 at the Kyoto First Red Cross Hospital, Kyoto, Japan. Patients receiving HEN may experience tube-related complications such as tube occlusion, tube migration, and inadvertent tube removal, which may lead to early termination of HEN19. Previously, we experienced bowel torsion when a jejunostomy feeding tube was placed at distal jejunum of R-Y anastomosis. Therefore, in this study, we improved and changed the procedure. Namely, as shown in Fig. 2, a jejunostomy feeding tube (9 Fr, 70 cm, Covidien Japan Co., Ltd., Tokyo, Japan) was placed by the Stamm and Witzel procedure at the afferent loop of the jejunum to avoid these tube-related complications. The jejunostomy feeding tube and surrounding jejunum were fixed at the left intra-abdominal wall by an open or laparoscopic/robotic procedure using 3-0 PDS® II (Ethicon Japan Co., Ltd., Tokyo, Japan) or 4-0 V-Loc™ 180 (Covidien Japan Co., Ltd., Tokyo, Japan). Outer fixation was performed at the skin using 3-0 Nylon. The indwelled jejunostomy feeding tube was replaced with a new one if it was used for more than 3 months.
Managements of nutritional support and jejunostomy feeding tube
All patients were scheduled to start oral intake on postoperative day 2 and reach the rice gruel or solid diet on postoperative day 5. Regarding the jejunostomy enteral nutrition, glutamine fiber oligosaccharide GFO® (Otsuka Pharmaceutical Factory, Inc., Yamanashi, Japan) was started in 10 ml/h during 24 h on postoperative day 1. Enteral Elental® (EA Pharma Co., Ltd., Tokyo, Japan) elemental nutrition (1 kcal/1 ml, 300 kcal/1 pack/300 ml) was started in 20 ml/h during 24 h on postoperative day 2, and gradually increased up to 60 ml/h day by day. If patients could eat the rice gruel, Elental® elemental nutrition was changed to night continuous enteral nutrition. For the night continuous enteral nutrition, the concentration of the Elental® elemental nutrition was changed to 2 kcal/ml during 8–10 h. Specifically, 4 packs of Elental® powder were dissolved in 600 ml water (1200 kcal/4 packs/600 ml) and were continuously administered in 60–80 ml/h during 8–10 h at night. After starting the night continuous enteral nutrition, all patients were discharged even if patients could not eat enough.
At home, night home enteral nutrition (N-HEN) was performed for more than 3 months postoperatively. Required total daily calories including both oral intake and N-HEN was planned to be more than 1200–1600 kcal/day. If patients could stably eat and reach 1200 kcal/day by only oral intake, N-HEN was gradually decreased and stopped, and the jejunostomy feeding tube was removed in the outpatient clinic.
Definitions of postoperative morbidity, mortality and nutritional indicators
Postoperative morbidity and mortality were defined as complications or death within 30 days after surgery or during hospitalization. Complications were classified according to the Clavien–Dindo classification system. Weight loss, prealbumin (Pre-ALB), albumin (ALB), total protein (TP), total cholesterol (T-Chol) and hemoglobin (Hb) were compared between both groups after 3 and 6 months. Moreover, the tolerance to chemotherapy was evaluated (Figs. 3, 4, Table 1).
Continuous monitoring of blood glucose concentration
The FreeStyle Libre® Flash Glucose Monitoring System (Abbott Diabetes Care Inc., Alameda, CA, USA) was used as the continuous monitoring of blood glucose concentration device to provide a record of an individual’s interstitial glucose concentrations, trends, and patterns. The sensor continuously measured glucose concentration every 15 min in interstitial fluid through a small filament inserted just under the skin. The sensor was placed subcutaneously on each patient’s left upper arm immediately prior to discharge from hospital. After 14 days, the sensor was removed in the outpatient clinic and the data were analyzed. In this study, we investigated 4 representative cases of the continuous monitoring of blood glucose concentration (Fig. 5).
Treatments following total gastrectomy
All patients were examined in the outpatient clinic, in which abdominal ultrasound, computed tomography (CT) and measurements of carcinoembryonic antigen (CEA) and carbohydrate antigen 19–9 (CA19-9) levels were performed every 1–3 months after surgery. All 34 pStage II–III patients were recommended to perform adjuvant chemotherapy if it was physiologically possible regardless of age, and 27 patients underwent S-1 or S-1 based chemotherapy postoperatively. Adjuvant chemotherapy was continuously performed for more than 1 year without recurrences, but some patients preferred to be followed without chemotherapy due to various reasons including poor physiological status. Regarding the continuation of adjuvant chemotherapy, recent Japanese study (JCOG1104, OPAS-1 trial) suggested the significance of long duration in adjuvant S-1 therapy20. This OPAS-1 trial study proved survival merit of 12 months duration of S-1 in comparison with 6 months, although whether more than 1 year duration of S-1 affects long-term survival is unclear. Therefore, if patients preferred to continue S-1 more than 1 year after recommended S-1 or S-1 based chemotherapy and could afford to continue physically without side effect, we continued S-1 until 3 years.
Statistical analysis
The χ2 test and Fisher’s exact probability test were performed for categorical variables, whereas the Student’s t-test and Mann–Whitney U-test for unpaired data of continuous variables were performed to compare the clinicopathological characteristics between the two groups. P < 0.05 was considered statistically significant.
Approval of the research protocol
The study was approved by the institutional review board of Kyoto First Red Cross Hospital.
Informed consent
Patients’ data were collected with written informed consent, approved by the Hospital Ethical Committee of the Kyoto First Red Cross Hospital.
Results
Baseline patient characteristics
Table 1 summarizes the characteristics of the 46 patients (31 males and 15 females). The numbers of patients in each postoperative pathological stage were as follows: 12 in Stage I, 11 in Stage II, and 23 in Stage III. Regarding background factors, there were no significant differences between H-HEN and CG in gender, age, body mass index, pT stage, pN stage, all pStage and postoperative complications, excluding surgical approaches (Table 1). All patients with N-HEN could continue for over 3 months. Median duration and range of N-HEN therapy was 5.0 months (range 3.0–10.7). There were no patients with severe abdominal fullness, reflux, nausea, vomiting or diarrhea to discontinue N-HEN. Regarding the postoperative hospital stay, patients with N-HEN tended to stay shorter than CG. During the three postoperative months, patients receiving N-HEN did not experience any tube-related complications such as tube occlusion, tube migration, inadvertent tube removal or internal ileus, which would have resulted in tube removal and early termination of N-HEN.
Nutritional outcomes and extent of tolerance to adjuvant chemotherapy
Figure 3 shows waterfall plots of body weight change rate. After 3 and 6 months, patients with N-HEN significantly presented less body weight loss than CG (3 months P < 0.0001: N-HEN 4.0% vs. CG 15.2%, 6 months P < 0.0001: N-HEN 7.7% vs. CG 17.7%). Regarding the Pre-ALB, it was significantly higher in patients with N-HEN than CG after 3 and 6 months (3 months P < 0.0001: N-HEN 24.1 mg/dl vs. CG 14.7 mg/dl, 6 months P = 0.0037: N-HEN 22.1 mg/dl vs. CG 16.2 mg/dl). Also, ALB, TP and Hb tended to be higher after 3 and 6 months in patients with N-HEN than CG, and T-Chol after 6 months (Fig. 4). The results of subgroup analyses of body weight loss rate and Pre-ALB according to the cancer stage were shown in Supplementary Fig. 1S. In both Stage I and Stage II–III patients, patients with N-HEN significantly presented less body weight loss than CG after 3 and 6 months. Pre-ALB was also significantly higher in patients with N-HEN than CG after 3 and 6 months. Subgroup analyses according to the cancer stage also showed similar finding to all stage analysis.
Regarding the tolerance to adjuvant chemotherapy, in 14 CG patients with Stage II–III cancer, 5 patients (36%) could not start adjuvant chemotherapy due to poor physiological status. Of 9 patients starting adjuvant chemotherapy, 56% (5/9) patients could not continue 1 year of recommended S-1 or S-1 based chemotherapy because of poor physiological status including malnutrition. The completion rate of adjuvant chemotherapy in CG patients was 29% (4/14). The mean duration of adjuvant chemotherapy was 261 days (range 62–511 days). Whereas in 20 N-HEN patients with Stage II–III cancer, 2 patients (10%) could not start chemotherapy. Of 18 patients starting adjuvant chemotherapy, 22% (4/18) patients could not continue 1 year. The completion rate of adjuvant chemotherapy in N-HEN patients was 70% (14/20). The mean duration of adjuvant chemotherapy was 458 days (range 71–1063 days). Therefore, Stage II–III patients with N-HEN significantly had a higher completion rate (P = 0.0420: N-HEN 70% vs. CG 29%) and longer duration (P = 0.0313: N-HEN 458 days vs. CG 261 days) to undergo adjuvant chemotherapy as planned (Table 1).
Continuous monitoring of blood glucose concentration in patients supported by N-HEN
A recent study identified that more than 50% (9/13) of patients following total gastrectomy without N-HEN presented for longer periods of nocturnal hypoglycemia with < 70 mg/dL during the time between 00:00 and 06:00 h21 (data not shown). However, continuous monitoring of blood glucose concentration in patients supported by N-HEN did not show nocturnal hypoglycemia or hyperglycemia during the time between 20:00 and 06:00 h (0% (0/4)) (Fig. 5).
Discussion
Postoperative malnutrition following total gastrectomy can deteriorate the quality of life, reduce the tolerance and efficacy of anti-cancer treatments and worsen the final prognosis. Professor Imamura reported that a postoperative nutrition therapy of 300 kcal/day Elental® of oral nutritional supplements (ONS) in addition to usual oral food intake significantly improved weight loss following gastrectomy, particularly in total gastrectomy22. However, other studies could not show the significance of ONS23,24,25,26. Previously, we also tried to use ONS painstakingly but could not improve postoperative malnutrition stably in all patients. Therefore, in this study, we modified and devised a novel N-HEN as an enforced enteral nutrition therapy and clarified the favorable role. Patients supported with N-HEN via a jejunostomy during the night (Elental:1200 kcal/600 ml/8–10 h during the night) were compared to normal follow-up patients. As a result, we demonstrated that patients with N-HEN more frequently maintained nutrition indicators in Pre-ALB, ALB, TP and Hb and significantly had less body weight loss (3 months: N-HEN 4.0% vs. CG 15.2%, 6 months: N-HEN 7.7% vs. CG 17.7%) than CG after 3 and 6 months. Moreover, in Stage II–III patients, patients supported by N-HEN had a higher completion rate (N-HEN 70% vs. CG 29%) and longer duration (N-HEN 458 days vs. CG 261 days) of undergoing adjuvant chemotherapy as planned. A recent meta-analysis suggested that HEN is safe and more effective in malnourished patients undergoing upper GI surgery than ONS27. Thus, our results strongly suggested that N-HEN could also be a pivotal strategy as effective nutrition to support potentially malnourished patients following total gastrectomy.
Sufficient jejunostomy enteral nutrition generally needs continuous administration at 60–100 ml/h because bolus intermittent administration such as gastrostomy nutrition causes diarrhea. Whereas, if HEN is performed continuously during the daytime, it impairs the daily activity and reduces oral intake because of hyperglycemia. Therefore, in this study, we invented night HEN (N-HEN) as a novel HEN method. Patients supported by N-HEN could sufficiently take 1200 kcal of nutritional supplements during every night for three postoperative months in addition to standard oral intake. Moreover, even if patients could not eat enough postoperatively, patients supported by N-HEN could be discharged from hospital and avoid fatigue due to poor nutrition, maintain body strength and an active daily life and undergo chemotherapy. These merits of N-HEN could be useful for every patient, particularly elderly patients and advanced gastric cancer patients who need meticulous follow-up following total gastrectomy. Regarding the long-term nutritional outcomes, although we could not still present all nutritional parameter data, patients with N-HEN had significantly less body weight loss than CG even after 12 months (P < 0.0001: N-HEN 9.2% vs. CG 16.5%). Therefore, N-HEN support may influence their long-term favorable outcomes on these patients.
Previous studies have identified that completing cancer treatment was significantly associated with good physical status12,28, and active nutritional therapy significantly improved survival in patients with advanced cancer cachexia29. Therefore, N-HEN may result in patients being more physically energetic, achieving better physical function and experiencing alleviation of fatigue, which could contribute to full completion of cancer treatment, and may increase the overall survival rate for patients following total gastrectomy. In our study, although the follow-up time is still short, all Stage I patents survived in both groups. Stage II–III patients with N-HEN comparatively presented better long-term survival rates than CG patients [N-HEN: 1-year 90.0%, 2-year 84.7%, 3-year 84.7% and 4-year 84.7% vs. CG: 1-year 92.9%, 2-year 78.6%, 3-year 78.6% and 4-year 60.6%, median follow-up time: 994 days (range 323–1942)]. Because advanced cancer patients with N-HEN significantly had a higher completion rate (P = 0.0420: N-HEN 70% vs. CG 29%) and longer duration (P = 0.0313: N-HEN 458 days vs. CG 261 days) to undergo adjuvant chemotherapy as planned, better tolerance to adjuvant chemotherapy in addition to better nutritional status in Stage II–III patients may contribute to the long-term survival outcomes.
A fascinating finding of our study was that N-HEN could improve nocturnal hypoglycemia following total gastrectomy. A recent study demonstrated that more than 50% of patients following total gastrectomy suffer from longer periods of nocturnal hypoglycemia with < 70 mg/dL at the time between 00:00 and 06:00 h21. This nocturnal hypoglycemia might give rise to postoperative fatigue, poor physical function and poor nutrition following total gastrectomy. In this study, patients supported by N-HEN did not present hypoglycemia (0/4). As a result, nighttime might be the best timing to perform nutritional therapy following total gastrectomy. Thus, N-HEN could be a physiologically effective enforced nutritional strategy to support potentially malnourished patients following total gastrectomy.
Guidelines for enhanced recovery after upper GI surgery have been suggested, including HEN by enteral tube feeding or ONS16,30,31. However, until now, only a few studies have calcified the significance of HEN27,32. The merits of HEN, particularly in N-HEN have not fully been established in a well-designed nationwide or randomized controlled study. Therefore, our study had limitations. First, this was a preliminary study with short-term nutritional outcomes by a single institute, and the number of recruited patients was small. Second, the short-term outcomes of N-HEN were fair; however, the long-term outcomes, QOL and survival effects were unknown. Nevertheless, N-HEN is safe, and may be reliable as a novel enforced and physiologically effective nutritional strategy to support potentially malnourished patients following total gastrectomy. We will report in the near future on QOL, the long-term nutritional outcomes and survival following our study, and perform a prospective multicenter or nationwide study.
Data availability
The datasets generated and/or analysed during the current study are not publicly available due to the personal information protection law in Japan but are available after the permission from the institutional review board and the corresponding author on reasonable request.
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S.K. designed the research. S.K., T.K., D.M., K.S., J.I., K.S., F.T., H.I., T.K., Y.S. and E.O. performed the research and analyzed data, and S.K. wrote the paper.
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Komatsu, S., Konishi, T., Matsubara, D. et al. Night home enteral nutrition as a novel enforced and physiologically effective nutrition therapy following total gastrectomy for gastric cancer. Sci Rep 12, 14922 (2022). https://doi.org/10.1038/s41598-022-17420-8
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DOI: https://doi.org/10.1038/s41598-022-17420-8
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