Annals of Clinical Nutrition and Metabolism

Micronutrient deficiencies in copper, zinc, and vitamin D as predictors of clinical outcomes in critically ill surgical patients in Korea: a retrospective cohort study: Jiae Kim, Yanghee Jun, Ye Rim Chang, Jong-Kwan Baek, Hak-Jae Lee, Hyewon Han, Suk-Kyung Hong; Ann Clin Nutr Metab 2024;16(3):158-167. Published online December 1, 2024; DOI: https://doi.org/10.15747/ACNM.2024.16.3.158

Abstract PDF: Purpose: To investigate the prevalence of copper, zinc, and vitamin D deficiencies in surgical intensive care unit (SICU) patients and the associations between those deficiencies and clinical outcomes.
Methods: We conducted a retrospective study of 210 patients admitted to the SICU of Asan Medical Center between June 2020 and June 2022. Micronutrient levels were measured within 7 days of SICU admission. Primary outcomes were the mortality rate, length of SICU stay, hospital stay duration, and mechanical ventilation duration.
Results: Copper deficiency was found in 35% (68/193), zinc deficiency in 52% (100/193), and severe vitamin D deficiency in 46% (82/179) of patients. Copper-deficient patients showed a significantly higher mortality rate (25.0% vs. 12.8%, P=0.044), longer hospital stays (57.8±47.0 vs. 45.2±36.6 days, P=0.041), and extended mechanical ventilation duration (26.9±23.3 vs. 18.8±15.7 days, P=0.012). Zinc deficiency was associated with higher C-reactive protein levels (16.2±9.5 vs. 11.5±8.8 mg/dL, P=0.001) and lower prealbumin levels (6.5±2.8 vs. 9.9±5.6 mg/dL, P<0.001). Severe vitamin D deficiency (<10 ng/mL) was not significantly associated with mortality or other clinical outcomes (mortality: <10 ng/mL vs. ≥10 ng/mL, 13% vs. 18%, P=0.583).
Conclusion: Micronutrient deficiencies are prevalent in SICU patients. Copper deficiency significantly correlated with poor clinical outcomes, and zinc deficiency showed a strong association with inflammatory markers. Early assessment and supplementation of micronutrients could be beneficial for critically ill surgical patients.

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Pneumothorax due to malpositioned nasogastric enteral feeding tube: Hyebeen Kim, Suk-Kyung Hong; Ann Clin Nutr Metab 2024;16(2):87-88. Published online August 1, 2024; DOI: https://doi.org/10.15747/ACNM.2024.16.2.87

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Recent advances in refeeding syndrome in critically ill patients: a narrative review: Sang Woo Ha, Suk-Kyung Hong; Ann Clin Nutr Metab 2024;16(1):3-9. Published online April 1, 2024; DOI: https://doi.org/10.15747/ACNM.2024.16.1.3

Abstract PDF: Purpose: The aim of this article is to provide a narrative review of the most recent studies on refeeding syndrome (RS) in critically ill patients and to summarize recent advancements that can be referenced in the treatment of these patients.
Current concept: RS in critically ill patients is a potentially lethal nutrition-related condition leading to sudden death. Initiation of food intake after a period of fasting can trigger rapid electrolyte uptake due to increased insulin release, leading to a decline in serum electrolytes with thiamine. This depletion may cause severe complications, such as cardiac arrhythmias, respiratory failure, seizures, and even death. The incidence of RS varies significantly, ranging from 7.4%–89%. Despite updates in diagnostic criteria over time, there remains a crucial need for criteria applicable to critically ill patients with underlying disorders such as metabolic derangement and organ dysfunction. To prevent RS, it is strongly recommended to start food intake after a fast at 20%–25% of estimated goals, gradually increasing the intake over several days. Close monitoring and electrolyte supplementation—especially of phosphorus, potassium, magnesium, and thiamine—are crucial, especially in critically ill patients. If electrolyte imbalances persist, slowing down or halting the progression of nutrition should be considered.
Conclusion: Clinicians should continue their efforts to promptly identify high-risk patients and to provide prevention and treatment for RS, particularly during the initiation of nutritional therapy in critically ill patients. Developing evidence-based protocols through further well-designed research is essential for effectively managing critically ill patients at risk of RS.

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Refeeding Syndrome in Critically Ill Patients: Sang Woo Ha, Suk-Kyung Hong; Ann Clin Nutr Metab 2022;14(2):72-80. Published online December 1, 2022; DOI: https://doi.org/10.15747/ACNM.2022.14.2.72

Abstract PDF Supplementary Material: Purpose: The aim of this study is to demonstrate clinical characteristics of refeeding syndrome (RS) and clinical utility of several guidelines including American Society for Parenteral and Enteral Nutrition consensus recommendations for RS and National Institute for Clinical Excellence guidelines.
Materials and Methods: Eighty-six patients screened for RS based on two guidelines were enrolled in this study. We evaluated the severity of RS after the initiation of ‘dextrose infusion’ and ‘balanced nutrition support’ with calculation of 5-day electrolyte changes. The primary outcome was 6-month mortality and secondary outcomes were duration of intensive care unit stay in days, duration of mechanical ventilation in days, and ventilator-free days at the 28th day.
Results: We observed statistically different distributions in terms of prevalence of RS on the basis of two different start times of caloric support (P=0.021). There was no statistically significant relationship between the risk of RS and severity of RS based on both guidelines. Also, the relevance between severity of RS and outcomes was not significant in our study. In multivariable logistic regression analysis of factors associated with outcomes, the significant factor for primary outcome was the ‘patients with significant risk’ (odds ratio, 9.65; 95% confidence interval, 1.83~50.90; P=0.007).
Conclusion: We demonstrated that even initial administration of dextrose solution and propofol could cause severe RS in critically ill patients. In addition, significant risk of RS was a predictive factor for 6-month mortality. Thus, it is essential to monitor the occurrence of RS even during initial resuscitation in patients with unstable metabolism.

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Provision of Enteral Nutrition in the Surgical Intensive Care Unit: A Multicenter Prospective Observational Study: Chan-Hee Park, Hak-Jae Lee, Suk-Kyung Hong, Yang-Hee Jun, Jeong-Woo Lee, Nak-Jun Choi, Kyu-Hyouck Kyoung; Ann Clin Nutr Metab 2022;14(2):66-71. Published online December 1, 2022; DOI: https://doi.org/10.15747/ACNM.2022.14.2.66

Abstract PDF: Purpose: Timely enteral nutrition (EN) is important in critically ill patients. However, use of EN with critically ill surgical patients has many limitations. This study aimed to analyze the current status of EN in surgical intensive care units (ICUs) in South Korea.
Materials and Methods: A multicenter, prospective, observational study was conducted on patients who received EN in surgical ICUs at four university hospitals between August 2021 and January 2022.
Results: This study included 125 patients. The mean time to start EN after admission to the surgical ICU was 6.2±4.6 days. EN was provided to 34 (27.2%) patients within 3 days after ICU admission. At 15.7±15.9 days, the target caloric requirement was achieved by 74 (59.2%) patients through EN alone. Furthermore, 104 (83.2%) patients received supplemental parenteral nutrition after a mean of 3.5±2.1 days. Only one of the four hospitals regularly used enteral feeding tubes and post-pyloric feeding tubes.
Conclusion: Establishing EN guidelines for critically ill surgical patients and setting an appropriate insurance fee for EN-related devices, such as the feeding pump and enteral feeding tube, are necessary.

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Letter from the Editor: Suk-Kyung Hong; Ann Clin Nutr Metab 2021;13(2):25-25. Published online December 31, 2021; DOI: https://doi.org/10.15747/ACNM.2021.13.2.25

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Status of Nutritional Support after Emergency Gastrointestinal Surgery in Korea: Retrospective Multicenter Study: Dae Sang Lee, Young Eun Park, Kyoung Hoon Lim, Ye Rim Chang, Suk-Kyung Hong, Minchang Kang, Jung-Min Bae, Ji Young Jang, Young Goun Jo, Ki Hoon Kim, Gil Jae Lee; Surg Metab Nutr 2020;11(1):1-6. Published online June 30, 2020; DOI: https://doi.org/10.18858/smn.2020.11.1.1

Abstract PDF: Purpose: Surgery itself causes an inflammatory response to an injury to the patient that leads to a stress metabolic state. Emergency gastrointestinal surgery may cause complications, such as ileus, bowel obstruction, ischemia, or anastomotic leakage, resulting in a delayed oral diet or poor overall nutrition. This study investigated the route of nutrition for patients who underwent emergency gastrointestinal surgery and when to provide nutrition after surgery.
Materials and Methods: Ten hospitals collected data retrospectively on the nutritional status and nutritional status of patients undergoing emergency gastrointestinal surgery for one year from January to December 2016. The clinical outcomes of the nutrient supply method, duration of supply, and type of surgery were performed. The dates from the time of surgery to the start of enteral nutrition, oral nutrition, and parenteral nutrition were calculated.
Results: Of 706 patients, there were 187 (26.5%) trauma patients, of which 63.5% were male. The onset of nutrition began after an average of 10.7 days postoperatively and after an average of 12.1 days of enteral nutrition. On average, it took 7.7 days to provide adequate calories, of which 63.3% had achieved adequate calories within a week. In the case of minimally invasive surgery, such as laparoscopic surgery, the adequate calorie supply time was five days, which was reached within one week.
Conclusion: In a retrospective multicenter analysis, the patients who underwent emergency gastrointestinal surgery had a late start of oral or enteral nutrition, and the ratio of adequate calorie supply within a week was low.

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Nutritional Therapy Related Complications in Hospitalized Adult Patients: A Korean Multicenter Trial: Eun-Mi Seol, Kye Sook Kwon, Jeong Goo Kim, Jung-Tae Kim, Jihoon Kim, Sun-Mi Moon, Do Joong Park, Jung Hyun Park, Je Hoon Park, Ji Young Park, Jung-Min Bae, Seung Wan Ryu, Ji-Young Sul, Dong Woo Shin, Cheung Soo Shin, Byung Kyu Ahn, Soo Min Ahn, Hee Chul Yu, Gil Jae Lee, Sanghoon Lee, A Ran Lee, Jae Young Jang, Hyun Jeong Jeon, Sung Min Jung, Sung-Sik Han, Suk-Kyung Hong, Sun-Hwi Hwang, Yunhee Choi, Hyuk-Joon Lee; J Clin Nutr 2019;11(1):12-22. Published online June 30, 2019; DOI: https://doi.org/10.15747/jcn.2019.11.1.12

Abstract PDF: Purpose:
Nutritional therapy (NT), such as enteral nutrition (EN) or parenteral nutrition (PN), is essential for the malnourished patients. Although the complications related to NT has been well described, multicenter data on symptoms in the patients with receiving NT during hospitalization are still lacking.
Methods:
Nutrition support team (NST) consultations, on which NT-related complications were described, were collected retrospectively for one year. The inclusion criteria were patients who were (1) older than 18 years, (2) hospitalized, and (3) receiving EN or PN at the time of NST consultation. The patients’ demographics (age, sex, body mass index [BMI]), type of NT and type of complication were collected. To compare the severity of each complication, the intensive care unit (ICU) admission, hospital stay, and type of discharge were also collected.
Results:
A total of 14,600 NT-related complications were collected from 13,418 cases from 27 hospitals in Korea. The mean age and BMI were 65.4 years and 21.8 kg/m². The complications according to the type of NT, calorie deficiency (32.4%, n=1,229) and diarrhea (21.6%, n=820) were most common in EN. Similarly, calorie deficiency (56.8%, n=4,030) and GI problem except for diarrhea (8.6%, n=611) were most common in PN. Regarding the clinical outcomes, 18.7% (n=2,158) finally expired, 58.1% (n=7,027) were admitted to ICU, and the mean hospital days after NT-related complication were 31.3 days. Volume overload (odds ratio [OR]=3.48) and renal abnormality (OR=2.50) were closely associated with hospital death; hyperammonemia (OR=3.09) and renal abnormality (OR=2.77) were associated with ICU admission; “micronutrient and vitamin deficiency” (geometric mean [GM]=2.23) and volume overload (GM=1.61) were associated with a longer hospital stay.
Conclusion:
NT may induce or be associated with several complications, and some of them may seriously affect the patient’s outcome. NST personnel in each hospital should be aware of each problem during nutritional support.

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Nutrition Therapy for Acute Respiratory Distress Syndrome Patients: Suk-Kyung Hong; Surg Metab Nutr 2016;7(1):20-23. Published online June 30, 2016; DOI: https://doi.org/10.18858/smn.2016.7.1.20

Abstract PDF: Nutrition therapy is a critical component of treatment for patients with acute respiratory distress syndrome/acute lung injury. Underfeeding can cause cumulative caloric deficits, loss of lean body mass, and deteriorationof respiratory muscle strength, which can all lead to poor outcomes. However, overfeeding, on the other hand, is also harmful due to hypercapnia and hyperglycemia, which can increase the risk of infection. Therefore, an optimal nutrition therapy is very important. Although the importance of nutrition in this patient population is widely accepted, trophic enteral feeding during the acute phase is suggested in immunologic aspect to prevent nutrition-related complications. High-fat and low-carbohydrate enteral nutrition can decrease CO₂ production and help shorten the duration of mechanical ventilation in patients with acute respiratory distress syndrome. There are still areas of controversy regarding the role of omega-3 fatty acids and antioxidants, which are known to prevent oxidative cellular injury, modify the metabolic response, and modulate immunity and inflammation.

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