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Research ArticleClinical Studies

Risk Factors for Overall Complications and Remote Infection After Gastrectomy in Elderly Gastric Cancer Patients

NAOHIKO NAKAMURA, DAISUKE KAIDA, YASUTO TOMITA, TAKASHI MIYATA, TOMOHARU MIYASHITA, HIDETO FUJITA, SHINICHI KINAMI, NOBUHIKO UEDA and HIROYUKI TAKAMURA
In Vivo September 2021, 35 (5) 2917-2921; DOI: https://doi.org/10.21873/invivo.12582
NAOHIKO NAKAMURA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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  • For correspondence: n1982422@kuhp.kyoto-u.ac.jp
DAISUKE KAIDA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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YASUTO TOMITA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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TAKASHI MIYATA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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TOMOHARU MIYASHITA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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HIDETO FUJITA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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SHINICHI KINAMI
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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NOBUHIKO UEDA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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HIROYUKI TAKAMURA
Department of Surgical Oncology, Kanazawa Medical University Hospital, Ishikawa, Japan
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Abstract

Background/Aim: A significant predictive factor for the occurrence of complications after gastrectomy in elderly gastric cancer patients is yet to be determined. We aimed to evaluate the clinical factors associated with overall complications including remote infection after gastrectomy in elderly gastric cancer patients. Patients and Methods: We retrospectively analyzed data of 101 patients aged over 80 years, who underwent curative gastrectomy. We analyzed the clinicopathological factors that were independently associated with the occurrence of overall complications or remote infection by a logistic regression model. Results: The overall complication rate was 24.8%. We identified pneumonia as a remote infection, and the occurrence rate of remote infections was 5.9%. On multivariate analysis, hemoglobin (<11 g/dl) and operation time (>240 min) were significantly correlated with the occurrence of overall complications. Regarding the occurrence of remote infection, performing total gastrectomy and a hemoglobin level <11 g/dl were identified as significant risk factors. Conclusion: Preoperative anemia and intraoperative factors, including the surgical procedure, could affect the occurrence of postoperative complications in elderly patients.

  • Gastric cancer
  • complications
  • gastrectomy
  • elderly patients

Gastric cancer (GC) is the fifth most common malignancy and the second most common cause of cancer mortality worldwide (1). Incidence of GC peaks in the seventh decade of life (2), and the proportion of elderly patients diagnosed with GC has increased due to the aging of the population (3). In particular, Japan is progressing toward an aging society at an unprecedented rate. In this situation, the probability of performing gastrectomy in elderly GC patients is increasing (4). Although endoscopic resection can be an indication for the curative resection of early GC without lymph node metastasis, the main curative therapeutic strategy for GC still consists of gastrectomy. Regarding the treatment for elderly GC patients, surgeons should carefully decide on the indication for surgery and consider the appropriate strategy that is the less aggressive treatment because elderly patients have a high prevalence of complications and mortality after gastrectomy (5, 6).

Due to the fact that surgical techniques and perioperative care skills for GC patients have progressed, recent postoperative prognosis has been improved, even among elderly patients (7). Several studies have confirmed the short-term safety and long-term benefit of surgical resection for GC in elderly patients (8, 9). In a recent study, postoperative mortality in elderly GC patients was reported to be 6.1%, which is lower than that in previous studies (10). However, the risk of complications and mortality associated with surgery in elderly GC patients is still higher than that in younger patients (11, 12). Postoperative complications including remote infection, which is defined as an infection out of the surgical site, could lead to a longer hospital stay and rehabilitation delay in elderly patients. Particularly, pneumonia as a remote infection after surgery could greatly affect the postoperative quality of life and prognosis in elderly GC patients. Regardless of the increased opportunity to perform gastrectomy for elderly patients, the risk factors for remote infection including pneumonia in elderly GC patients remain unknown. Since elderly GC patients usually have some comorbidities or sarcopenia conditions that could lead to occurrence of severe postoperative complications, detailed understanding of the risk factors associated with the occurrence of overall complications or remote infections is very essential for surgical management in elderly GC patients.

In this study, we aimed to evaluate clinical factors associated with occurrence of complications after gastrectomy in elderly GC patients. Preoperative characteristics, pathological findings, and operative outcomes were analyzed to identify the risk factor for not only overall complications, but also remote infections.

Patients and Methods

We retrospectively analyzed data on 101 patients aged over 80 years, who underwent curative gastrectomy for GC at the Kanazawa Medical University Hospital between January 2009 and December 2019. Clinical data before surgery, such as sex, age, American Society of Anesthesiologists Physical Status (ASA PS) score, comorbidity, and body mass index (BMI), were extracted from our hospital’s database. We collected the results of the blood examination before the surgery, including data regarding the white blood cell (WBC) count, the fraction of neutrophil/lymphocyte ratio (NLR) in the WBC differential, hemoglobin level, and serum levels of C-reactive protein (CRP), total protein, albumin, cholinesterase, creatinine, carcinoembryonic antigen (CEA), and carbohydrate antigen 19-9 (CA 19-9). Pathological results were assessed according to the 8th edition of the UICC TNM Staging System for Gastric Cancer (13). Gastrectomy and lymph node dissection were performed according to the 2014 Japanese GC treatment guidelines (version 4) (14), and intraoperative outcomes were evaluated. Postoperative complications were assessed on the basis of the Clavien-Dindo classification (15), and ≥grade II complications were included in the analysis. We obtained informed consent from the patients. This study was approved by the Medicine Ethics Committee of Kanazawa Medical University. The research reported in this paper was in compliance with the Helsinki Declaration.

Statistical analysis. Data were expressed as n (%) or medians (range). Continuous variables were compared using the Student’s t-test, while categorical variables were compared using the χ2 test. All p-Values were two-sided, and differences with a p-value of <0.05 were considered statistically significant. A logistic regression model was used to identify clinical factors that were independently associated with the occurrence of postoperative complications. Variables that were associated with the occurrence of postoperative complications at p≤0.10 in the univariate analysis were included in the multivariate analysis. All statistical analyses were performed using JMP software version 8.0 (SAS Institute, Cary, NC, USA).

Results

The patient characteristics are shown in Table I. The median age of the study population was 82 years, and 66.4% of patients were males. More than 80% of patients showed ASA PS ≥2, and 68.3% had comorbidities such as diabetes mellitus or hypertension that needed treatment by medication. The median levels of serum CEA and CA19-9 were within the normal range. Pathological stage I, II, III, and IV accounted for 51.5, 22.8, 23.8, and 2.0% of patients, respectively. Regarding surgical outcomes, distal, total, and proximal gastrectomy were performed in 63.4, 12.9, and 15.8% of patients, respectively, and laparoscopic surgery in 13.9% of patients. Clavien-Dindo classification ≥grade II complications were observed in 25 (24.8%) patients. Regarding the details of complications, delayed gastric emptying, anastomotic leakage, pneumonia, and surgical site infection occurred in 8 (32%), 6 (24%), 6 (24%), and 3 (12%) patients (Table II). All delayed gastric emptying was associated with distal gastrectomy.

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Table I.

Patient characteristics.

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Table II.

Postoperative complications.

In analyzing the correlation between the clinical factors and the occurrence of overall complications (Table III), hemoglobin levels (p=0.001), operation time (p=0.04), serum levels of CRP (p=0.07) and albumin (p=0.09), and ASA PS (p=0.10) were considered to be significantly correlated with the occurrence of overall complications on univariate analysis. In the multivariate analysis including these factors, hemoglobin (<11 g/dl) and operation time (>240 min) were significantly correlated with the occurrence of overall complications (p=0.002 and 0.01, respectively). In contrast, there was no significant association between the occurrence of overall complications and tumor markers, pathological stage, or surgical procedures.

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Table III.

Univariate and multivariate analyses to identify risk factors for the occurrence of overall complications.

In the univariate analysis, regarding the correlation between clinical factors and occurrence of pneumonia as a remote infection (Table IV), hemoglobin level (p=0.02), performing total gastrectomy (p=0.02), serum levels of CRP (p=0.02) and albumin (p=0.03), and intraoperative bleeding (p=0.04) were significantly correlated with the occurrence of pneumonia. There was no significant association between the occurrence of pneumonia and the ASA PS or presence of comorbidity. In multivariate analysis, performing total gastrectomy and a hemoglobin level <11 g/dl were significantly correlated with the occurrence of pneumonia as a remote infection (p=0.001 and p=0.008, respectively).

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Table IV.

Univariate and multivariate analyses to identify risk factors for the occurrence of remote infection.

Discussion

Although some studies have been conducted to better adjust the therapeutic strategy for elderly GC patients, treatments for elderly GC patients remain controversial. Elderly patients have more comorbidities than non-elderly patients, and surgery or conventional chemotherapy could be harmful rather than beneficial in some patients. Previous studies have shown that age is a significant predictive factor for postoperative morbidity after GC surgery (16, 17). However, a significant predictive factor for the occurrence of postoperative complications in elderly GC patients is yet to be clarified. With the increasing rate of gastrectomy in elderly GC patients, clinical factors that can predict the occurrence of postoperative complications including remote infection are of great interest for making adjustments in the surgical strategy for elderly patients. In this study, we found that preoperative hemoglobin level and operation time were significant predictive factors for overall complications after gastrectomy in elderly GC patients. Of note, a lower hemoglobin level and performing total gastrectomy could significantly be associated with the occurrence of postoperative remote infections such as pneumonia.

The overall complication rate after gastrectomy in GC patients over 80 years of age was reported to be 30.8% in a recent study (18). The present study demonstrated that complications with a Clavien-Dindo classification≥grade II were observed in 24.8% of patients, which is consistent with the results of previous reports on elderly GC patients (19, 20). In previous studies analyzing elderly GC patients, the elderly group tended to have lower ASA-PS, hemoglobin levels, and serum albumin levels than the control group. In our cohort, more than 80% of patients exhibited ASA PS ≥2 and the median levels of hemoglobin and albumin were below the normal range. We detected postoperative complications, including delayed gastric emptying, anastomotic leakage, pneumonia, and surgical site infection. Notably, postoperative pneumonia as a remote infection was observed in six patients (5.9%). Previous reports showed that postoperative pneumonia occurred in 3-10% of patients and was the most common complication in elderly patients (18-20). Pneumonia is one of the most important complications after gastrectomy, which could affect the period of hospital stay or the quality of life after discharge in elderly GC patients. Thus, surgeons should understand the risk factors and be careful to prevent the occurrence of pneumonia after gastrectomy.

In this study, preoperative hemoglobin levels were significantly associated with overall complications or remote infection in elderly GC patients. It was previously reported that preoperative lower hemoglobin levels caused post-gastrointestinal operative complications such as postoperative fatigue (21). Another previous study demonstrated that the oxygen transferred by hemoglobin was involved in wound healing (22). Based on these results, a lower preoperative hemoglobin level may compromise general tissue oxygenation and hence result in the occurrence of complications. Conversely, preoperative BMI, NLR, or serum albumin levels were reported as a significant risk factor for overall complications after gastrectomy in all generations (23). These preoperative factors did not affect elderly patient morbidity in this study. In contrast, we identified that intraoperative factors were significantly associated with the occurrence of complications. It has been already reported that intraoperative factors are significantly associated with the occurrence of complications after gastrectomy in elderly GC patients (20, 24). Interestingly, this study confirmed that, performing total gastrectomy in elderly patients could increase the risk for remote infection. There is no previous report analyzing the risk factors for remote infection in elderly GC patients. Our results suggest that intraoperative factors including the type of gastrectomy have a greater influence on postoperative morbidity and that performing total gastrectomy should be avoided in elderly patients who are at a greater risk for pneumonia. In addition, surgeons should more carefully consider the surgical maneuvers used in elderly GC patients in order to reduce the amount of blood loss during surgery and the operation time, thereby preventing overall complications and remote infection.

This study has certain limitations. It was a retrospective study performed at a single institution, with a small sample size. Thus, to confirm the predictive value of the risk factors for overall complication or remote infection after gastrectomy, further research with a prospective cohort study in multiple institutions is warranted.

Conclusion

We evaluated the clinical risk factors associated with the occurrence of overall complications or remote infections after gastrectomy in elderly GC patients. Preoperative anemia and intraoperative factors, including the surgical procedure, could affect the occurrence of postoperative complications. Management for anemia before surgery and the choice of a less invasive surgery could be essential for elderly patients to prevent the occurrence of overall complications or remote infections after gastrectomy.

Footnotes

  • Authors’ Contributions

    NN designed the study. NN, DK, and TM performed data acquisition, data analysis, and interpretation. NN prepared the manuscript. YT, TM, HF, SK, NU, and HT revised the manuscript critically. All Authors read and approved the final manuscript.

  • This article is freely accessible online.

  • Conflicts of Interest

    The Authors declare no competing interest in connection with this study.

  • Received May 4, 2021.
  • Revision received May 20, 2021.
  • Accepted June 8, 2021.
  • Copyright © 2021 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Risk Factors for Overall Complications and Remote Infection After Gastrectomy in Elderly Gastric Cancer Patients
NAOHIKO NAKAMURA, DAISUKE KAIDA, YASUTO TOMITA, TAKASHI MIYATA, TOMOHARU MIYASHITA, HIDETO FUJITA, SHINICHI KINAMI, NOBUHIKO UEDA, HIROYUKI TAKAMURA
In Vivo Sep 2021, 35 (5) 2917-2921; DOI: 10.21873/invivo.12582

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Risk Factors for Overall Complications and Remote Infection After Gastrectomy in Elderly Gastric Cancer Patients
NAOHIKO NAKAMURA, DAISUKE KAIDA, YASUTO TOMITA, TAKASHI MIYATA, TOMOHARU MIYASHITA, HIDETO FUJITA, SHINICHI KINAMI, NOBUHIKO UEDA, HIROYUKI TAKAMURA
In Vivo Sep 2021, 35 (5) 2917-2921; DOI: 10.21873/invivo.12582
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  • gastric cancer
  • complications
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  • elderly patients
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