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      Liver disease and 30-day mortality after colorectal cancer surgery: a Danish population-based cohort study

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          Abstract

          Background

          Colorectal cancer (CRC) is common, with surgery as the main curative treatment. The prevalence of chronic liver disease has increased, but knowledge is limited on postoperative mortality in patients with liver disease who undergo CRC surgery. Hence, we examined 30-day mortality after CRC surgery in patients with liver disease compared to those without liver disease.

          Methods

          We used medical databases to conduct a nationwide cohort study of all patients undergoing CRC surgery in Denmark from 1996 through 2009. We further identified patients diagnosed with any liver disease before CRC surgery and categorized them into two cohorts: patients with non-cirrhotic liver disease and patients with liver cirrhosis. Patients without liver disease were defined as the comparison cohort. Using the Kaplan-Meier method, we computed 30-day mortality after CRC surgery in each cohort. We used a Cox regression model to compute hazard ratios as measures of the relative risk (RR) of death, controlling for potential confounders including comorbidities. In order to examine the impact of liver disease in different subgroups, we stratified patients by gender, age, cancer stage, cancer site, timing of admission, type of surgery, comorbidity level, and non-hepatic alcohol-related disease.

          Results

          Overall, 39,840 patients underwent CRC surgery: 369 (0.9%) had non-cirrhotic liver disease and 158 (0.4%) had liver cirrhosis. Thirty-day mortality after CRC surgery was 8.7% in patients without liver disease and 13.3% in patients with non-cirrhotic liver disease (adjusted RR of 1.49 95% confidence interval (CI): 1.12-1.98). Among patients with liver cirrhosis, mortality was 24.1%, corresponding to an adjusted RR of 2.59 (95% CI: 1.86-3.61). The negative impact of liver disease on postoperative mortality was found in all subgroups.

          Conclusions

          Pre-existing liver disease was associated with a markedly increased 30-day mortality following CRC surgery.

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          Most cited references22

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          The Danish Civil Registration System. A cohort of eight million persons.

          Carsten Bøcker Pedersen, Heine Gøtzsche, Jørgen Ostrup Møller … (2006)
          The Danish Civil Registration System (CRS) was established in 1968, where all persons alive and living in Denmark were registered. Among many other variables, it includes individual information on personal identification number, gender, date of birth, place of birth, place of residence, citizenship, continuously updated information on vital status, and the identity of parents and spouses. To evaluate the quality and completeness of the information recorded on persons in the CRS, we considered all persons registered on November 4, 2005, i.e. all persons who were alive and resident in Denmark at least one day from April 2, 1968 to November 4, 2005, or in Greenland from May 1, 1972 to November 4, 2005. A total of 8,176,097 persons were registered. On November 4, 2005, 5,427,687 (66.4%) were alive and resident in Denmark, 56,920 (0.7%) were alive and resident in Greenland, 2,141,373 (26.2%) were dead, 21,160 (0.3%) had disappeared, and 528,957 (6.5%) had emigrated. Among persons born in Denmark 1960 or later the CRS contains complete information on maternal identity. Among persons born in Denmark 1970 or later the CRS contains complete information on paternal identity. Among women born in Denmark April 1935 or later the CRS contains complete information on all their children. Among males born in Denmark April 1945 or later the CRS contains complete information on all their children. The CRS contains complete information on: a) immigrations and emigrations from 1971 onwards, b) permanent residence in a Danish municipality from 1971 onwards, c) permanent residence in a municipality in Greenland from May 1972 onwards, and d) full address in Denmark from 1977 onwards. Data from the CRS is an important research tool in epidemiological research, which enables Danish researchers to carry out representative population-based studies on e.g. the potential clustering of disease and death in families and the potential association between residence and disease and death.
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            Epidemiology. When an entire country is a cohort.

            L. Frank (2000)
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              Risk of venous thromboembolism in patients with liver disease: a nationwide population-based case-control study.

              Kirstine Kobberøe Søgaard, Hendrik Vilstrup, Erzsébet Horváth-Puhó … (2008)
              It is known that liver disease can cause an imbalance in the coagulation system, but available data on liver disease and risk of venous thromboembolism are conflicting. We examined the risk of venous thromboembolism in patients hospitalized with liver diseases. We conducted a nationwide Danish case-control study of incident cases of venous thromboembolism from 1980 to 2005 using population-based data from the National Registry of Patients, and from the Civil Registration System. We used conditional logistic regression to compute the relative risk of venous thromboembolism in patients with liver disease compared to population controls. We then excluded patients with known malignancy (diagnosed either before or up to 3 months after the venous thromboembolism) or fractures, trauma, surgery, or pregnancy within 90 days before the venous thromboembolism to estimate the risk associated with unprovoked venous thromboembolism. A total of 99,444 patients with venous thromboembolism and 496,872 population controls were included in the study. Patients with liver disease had a clearly increased relative risk of venous thromboembolism, varying from 1.74 (95% CI, 1.54-1.95) for liver cirrhosis to 1.87 (95% CI, 1.73-2.03) for non-cirrhotic liver disease. The risks were higher for deep venous thrombosis compared with pulmonary embolism. In the analysis, restricted to 67,519 patients with unprovoked venous thromboembolism and 308,614 population controls, we found slightly higher relative risks: 2.06 (95% CI, 1.79-2.38) for liver cirrhosis and 2.10 (95% CI, 1.91-2.31) for non-cirrhotic liver disease. Patients with liver disease have a substantially increased risk of venous thromboembolism.
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                Author and article information

                Journal
                Journal ID (nlm-ta): BMC Gastroenterol
                Journal ID (iso-abbrev): BMC Gastroenterol
                Title: BMC Gastroenterology
                Publisher: BioMed Central
                ISSN (Electronic): 1471-230X
                Publication date Collection: 2013
                Publication date (Electronic): 15 April 2013
                Volume: 13
                Page: 66
                Affiliations
                [1 ]Department of Clinical Epidemiology, Aarhus University Hospital, Olof Palmes Allé 43-45, Aarhus N DK-8200, Denmark
                Article
                Publisher ID: 1471-230X-13-66
                DOI: 10.1186/1471-230X-13-66
                PMC ID: 3637330
                PubMed ID: 23586850
                SO-VID: 2e00b997-b3e7-488a-960d-33266a4d1c5a
                Copyright © Copyright ©2013 Montomoli et al.; licensee BioMed Central Ltd.
                License:

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                Date received : 20 September 2012
                Date accepted : 9 April 2013
                Categories
                Subject: Research Article

                ScienceOpen disciplines: Gastroenterology & Hepatology
                Keywords: liver disease,colorectal neoplasms,surgery,mortality,epidemiology
                Data availability:
                ScienceOpen disciplines: Gastroenterology & Hepatology
                Keywords: liver disease, colorectal neoplasms, surgery, mortality, epidemiology

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