Refeeding Syndrome in Oncology: Report of Four Cases

Refeeding syndrome in surgical patients post initiation of artificial feeding, a prospective cohort study in a low-income country

BACKGROUND & AIMS

South Africa's inequitable history has contributed to a malnourished population, further aggravated by high levels of violence and economic uncertainty culminating in a population suffering the sequelae of poverty. The perceived notion is that malnutrition places the South African population at greater risk for development of refeeding syndrome. This study aimed to identify the incidence of refeeding syndrome in the South African population.

METHODS

All patients admitted into the surgical intensive care unit from 1 November 2019 to 30 September 2020, were screened using the National Institute for Health and Care Excellence (NICE) refeeding risk criteria. Patients started on artificial feeds with one or more risk factors were included in the study. The syndrome was confirmed using the King's College criteria and compared with the American Society for Parenteral and Enteral Nutrition (ASPEN) criteria for refeeding syndrome.

RESULTS

200 Patients were included in this study. The median age of the sample population was 41 years (IQR 30-58) with a male predominance (63%). All patients included had one or more risk factors and 62 (31%) of patients fulfilled the NICE criteria. The sensitivity of the NICE criteria was 33% and specificity was 70%. The most common risk factors identified were little or no nutritional intake for >5 days (55%) followed by a history of alcohol abuse, drugs including insulin, chemotherapy, diuretics or antacids (18%). Specificity values for all risk factors were >80% apart from little or no nutritional intake for >5 days which had a specificity of 64.2%. Sensitivity values for all risk factors were low. 84.5% of patients received artificial nutritional support in the form of enteral feeds, 9% parenteral and 6.5% both enteral and parenteral feeds. A total of 146 patients required electrolyte supplementation. Three patients fulfilled the King's College criteria and one subsequently died. In comparison, 25 patients fulfilled the ASPEN criteria and 3 demised.

CONCLUSION

Due to the low sensitivity and specificity of the NICE criteria, we advise that it be used merely as a guideline to identify patients at risk of refeeding syndrome and one should remain vigilant in patients with any risk factors present. Due to the small number of patients who fulfilled the King's College criteria and significant difference in incidence when compared to the ASPEN definition, a conclusion regarding the accuracy of both diagnostic criteria could not be made. We recommend a review of the current definition and a global adoption of an agreed criteria for the estimation of the true prevalence.

Is the risk of refeeding syndrome a problem in reaching nutritional requirements? A cohort of patients on enteral nutrition support

BACKGROUND

refeeding syndrome (RS) is a metabolic complication associated with nutritional support. The lack of management protocols for patients on nutritional support may lead to the development of RS or undernourishment.

OBJECTIVE

to evaluate adherence to the algorithm for total enteral nutritional support (ASNET), and the efficacy of reaching nutrient requirements in patients at risk of RS.

METHODS

a cohort study: screening and nutritional evaluation of patients and risk of RS were performed. Adults admitted to hospital for noncritical illness who received exclusively enteral nutrition (EN) were eligible. Patients with RS, intestinal failure or chronic diarrhea were excluded. Adherence to ASNET was evaluated along with the efficacy of nutritional support to reach the optimal protein and energy requirement (OPER) and any associated complications. Patient follow-up ended when the feeding route was changed or upon discharge.

RESULTS

a total of 73 patients were included (mean age, 62 ± 16 yrs; BMI, 18.5 ± 4.2 kg/m2), and 55 % were men. All had nutritional risk of developing RS (57, low; 15, high; 1, very high); 34 % had adequate adherence to ASNET, and 33 % managed to cover the total requirement between 4 and 6 days. OPER was reached by 38 % by the fourth day of EN, and adequate adherence to ASNET increased the probability of achieving it (RR, 2.2; 95 % CI, 1.6-3.2, p < 0.0001) without increasing the associated complications. Nonetheless, 36 % developed complications, of whom 96 % did not adhere to ASNET.

CONCLUSION

adherence to ASNET in patients at risk of RS allowed the achievement of OPER safely by day four with fewer associated complications.

Food Coma: Hyperammonemic Encephalopathy From Refeeding Syndrome

Hyperammonemic encephalopathy (HAE) from extrahepatic causes is increasingly being recognized. Refeeding syndrome is characterized by severe fluid and electrolyte shifts following the reintroduction of nutrition. We describe the case of a 67-year-old man with bilateral maxillary sinus squamous cell carcinoma on nivolumab who became comatose after initiation of enteral feeding. Initial workup was notable for severe hypophosphatemia (<1 mg/dL) and markedly elevated ammonia (226 µmol/L). Neuroimaging was unrevealing. Correction of hypophosphatemia did not improve mental status. Ammonia levels briefly decreased while holding enteral feeding but worsened again on resumption. High-volume continuous renal replacement therapy was recommended but deferred in accordance with family wishes. We hypothesize that HAE may have been precipitated by a combination of refeeding-induced high nitrogen burden and limited detoxification via the urea cycle and extrahepatic pathways in the setting of severe protein-energy malnutrition and underlying malignancy. Nivolumab could have contributed as well.

Refeeding syndrome occurs among older adults regardless of refeeding rates: A systematic review

Refeeding syndrome is a life-threatening clinical disorder that can occur when treating malnutrition. The aim was to examine the current knowledge of refeeding syndrome in patients ≥ 65 + years with special focus on the incidence of hypophosphatemia (HP) in relation to refeeding rate (kcal/kg/day), number of days until the lowest level of phosphate occurs (day of nadir), refeeding rates and adverse events, and death. Specifically, we hypothesized that higher energy provision would cause a higher incidence of HP. A search was conducted in the available databases. Two cohort studies, 1 case control, and a total of 12 case series/case reports, which accounted for 19 individual patient cases, were eligible. The incidence of HP (<0.5 mmol/L) was 15% and 25% in the 2 cohort studies and 4% in the case control study. The mean day of nadir was between days 2 and 3 in the cohort studies, day 11 in the case control study, and day 3 in the cases series/case reports. Importantly, a rapid drop in phosphate occurred receiving both 30 kcal/kg/day and 8 to 10 kcal/kg/day. The cohort studies reported high death rates-26% and 23%-using both 10 and 20 kcal/kg/day, respectively. Adverse events were noted in most all case series/case reports. Clinicians should be aware that HP may occur in up to 25% of older hospitalized adults, and importantly, it occurs even when refeeding cautiously. Hence, electrolytes should be closely monitored, especially between days 2 and 4, which is when the day of nadir occurs most frequently.

The Refeeding Syndrome: a neglected but potentially serious condition for inpatients. A narrative review

The Refeeding Syndrome (RFS) is a potentially serious, but still overlooked condition, occurring in individuals who are rapidly fed after a period of severe undernourishment. RFS derives from an abnormal electrolyte and fluid shifts leading to many organ dysfunctions. Symptoms generally appear within 2-5 days of re-feeding and may be absent/mild or severe and life threating, depending on the pre-existing degree of malnutrition and comorbidities. The lack of a standard definition and the nonspecificity of the symptoms make both incidence estimate and diagnosis difficult. In 2020, the American Society for Parenteral and Enteral Nutrition (ASPEN) proposed a unifying definition for the RFS and its severity classification. The awareness of the condition is crucial for identifying patients at risk, preventing its occurrence, and improving the management. The objectives of this narrative review were to summarize the current knowledge and recommendations about the RFS and to provide useful tips to help physicians to recognize and prevent the syndrome.

[Refeeding syndrome : Pathophysiology, treatment and which rheumatic patients are particularly at risk]

Rheumatische Krankheiten können über verschiedene Mechanismen zu einer Mangelernährung, also einer nicht ausreichenden Deckung des Bedarfs an Energie, Proteinen, Elektrolyten oder anderen Nährstoffen, führen. Bei Wiederbeginn mit vollwertiger Ernährung nach einer Phase einer solchen katabolen Stoffwechsellage kommt es zu metabolischen Veränderungen, die in einen akuten Mangel an verfügbaren Elektrolyten und anderen Mikronährstoffen führen und dann lebensbedrohliche Komplikationen auslösen können. Das Auftreten solcher Komplikationen nach Wiederbeginn der Ernährung wird als Refeeding-Syndrom bezeichnet. Mit Wissen um diese Komplikationen, dem adäquaten Wiederbeginn der Ernährung und ggf. einer Überwachung der relevanten Parameter sowie gezielter Supplementierung kann das Refeeding-Syndrom vermieden werden. In dieser Übersichtsarbeit werden die Pathomechanismen des Refeeding-Syndroms erklärt, die Risikofaktoren für das Auftreten des Refeeding-Syndroms – insbesondere unter Betrachtung von rheumatologischen Patienten – identifiziert und die nötige Therapie zur Vermeidung eines Refeeding-Syndroms bei Wiederbeginn der Ernährung dargestellt.