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  • Case Report
  • Open Access

A case of refeeding syndrome during intradialytic parenteral nutrition

  • 1, 2,
  • 1, 2Email author,
  • 1,
  • 3 and
  • 1, 2
Renal Replacement Therapy20184:35

https://doi.org/10.1186/s41100-018-0176-5

  • Received: 5 March 2018
  • Accepted: 7 August 2018
  • Published:

Abstract

Background

Refeeding syndrome is a potentially fatal electrolyte shift in patients with rapid feeding after low-calorie intake. Although the key to diagnosing refeeding syndrome is hypophosphatemia after feeding, renal dysfunction might hide refeeding hypophosphatemia, especially in maintenance hemodialysis patients. Intradialytic parenteral nutrition (IDPN) is a therapeutic approach used to treat malnourished patients with maintenance hemodialysis. No earlier report describes a study of refeeding syndrome complicated with IDPN.

Case presentation

We present a case of a 77-year-old man undergoing maintenance hemodialysis for 17 years. While IDPN was administered after 10 days fasting, ventricular tachycardia (VT) occurred, possibly because of a rapid intracellular shift of potassium mainly explained as refeeding syndrome in addition to potassium removal by hemodialysis. A greater decline of serum phosphate concentrations during hemodialysis on that day compared with that during usual hemodialysis session supports our inference of the contribution of refeeding syndrome to VT complicated with hypokalemia.

Conclusion

Physicians should know that IDPN can induce refeeding hypophosphatemia and rapid intracellular shift of potassium. Synergic lowering effects of serum potassium both with intracellular shift caused by refeeding syndrome and potassium removal by hemodialysis might cause lethal arrhythmia in patients treated with IDPN. Before treating malnourished patients with IDPN, the risk of refeeding syndrome should be assessed in patients with high risk of refeeding syndrome.

Keywords

  • Hemodialysis
  • Intradialytic parenteral nutrition (IDPN)
  • Refeeding hypophosphatemia
  • Ventricular tachycardia

Background

Refeeding syndrome entails dynamic metabolic changes including potentially fatal electrolyte shift in patients with rapid feeding after low-calorie intake [1]. Metabolic changes include hypophosphatemia, hypokalemia, hypomagnesemia, sodium retention, and hyperglycemia [2]. Although hypophosphatemia is a hallmark of refeeding syndrome, renal dysfunction might hide refeeding hypophosphatemia, especially in maintenance hemodialysis patients [3]. For preventing refeeding syndrome, we should slowly start nutritional repletion of energy and monitor electrolyte levels [1].

Malnutrition is a common and crucially important problem in patients with maintenance hemodialysis. Its prevalence is 23–73% [4], depending on the selected nutritional markers and the population studied. Intradialytic parenteral nutrition (IDPN) is a therapeutic approach to treating malnourished patients with maintenance hemodialysis [4].

Case presentation

A 77-year-old anuric man receiving hemodialysis (HD) for 17 years was admitted to our hospital because of severe anemia caused by diverticular hemorrhage. His past medical history included diverticular hemorrhage, sigmoid colonic carcinoma treated with endoscopic mucosal resection, and prostate carcinoma. All of his medications, including calcium carbonate, lanthanum carbonate hydrate, alphacalcitriol, and cinacalcet, were stopped immediately after admission. He was treated with bowel rest and red cell concentrate transfusion. His blood stool improved gradually over 6 days. Intravenous peripheral infusion was continued during his bowel rest for 10 days. The administered intravenous fluid contained 26 g of glucose, 100 mg of thiamine, 100 mg of pyridoxine, and 1 mg of cyanocobalamin in 1000 mL of half saline per day. The patient had neither oral nor intravenous potassium supplementation during 10 days of fasting. During hospitalization, he received three sessions of 4-h HD per week under the dialysis condition of 230 mL/min blood flow rate, 500 mL/min dialysate flow rate, and 2.1-m2 surface area of dialyzer membrane: the same as that he received at an outpatient clinic before admission. Concentrations of dialysate electrolytes were 140 mEq/L sodium, 2.0 mEq/L potassium, 3.0 mEq/L calcium, and 35 mEq/L HCO3. Potassium concentrations before dialysis were 5.6 mEq/L, 4.9 mEq/L, and 4.4 mEq/L, respectively, on the third, sixth, and eighth days after admission. His dry weight was 54.9 kg; his body mass index (BMI) was 20.3 kg/m2.

On the 10th day after admission, IDPN was started during each HD session because of prolonged fasting. IDPN fluid consisting of a mix of 200 mL of 50%(w/w) glucose, 200 mL of 7.2% amino acid solution, and 250 mL of 20%(w/w) fat emulsions was administered to the patient through the venous chamber of the dialysis circuit at the rate of 160 mL/h. The total and administration rate of calories of IDPN were, respectively, approximately 970 kcal and 240 kcal/h. Non-sustained ventricular tachycardia (VT) occurred about one and half hours after starting HD. At that time, the net amount of the infused IDPN fluid was approximately 40% of the prepared fluid (390 kcal). The plasma potassium concentration was 3.2 mEq/L. It was considered that the VT was triggered by the rapid fall of serum potassium level which resulted from intracellular shift by refeeding syndrome in addition to removal by HD. Other symptoms characteristics of refeeding syndrome, such as heart failure, rhabdomyolysis, convulsion, and hemolytic anemia, were not observed. Therefore, we stopped the administration of IDPN immediately and adjusted the potassium concentration of dialysate to 4.0 mEq/L. After the HD session, the serum potassium concentration was 3.7 mEq/L. Although pre-dialytic BUN of the 10th day of admission was lower than that at 1 month before admission (28.9 mg/dL vs. 72.1 mg/dL), Kt/V was quite similar (1.69 vs. 1.69). His serum phosphate level was decreased substantially from 7.3 to 1.9 mg/dL during the HD session on the 10th day of admission, although it was decreased from 6.1 to 2.2 mg/dL during an HD session, 6 weeks before admission (Table 1). From 12-lead electrocardiography conducted immediately after the VT, results demonstrated that the corrected QT interval (QTc) was prolonged compared with his baseline (0.513 s vs. 0.476 s). Just after the HD session on the 10th day, 10 mmol of sodium phosphate and 20 mEq of magnesium sulfate were supplemented intravenously. Additional magnesium was supplemented because VT recurred once approximately 10 h after the HD session. From the 11th day after admission, oral nutrient intake was re-started. The amount of oral nutritional intake was increased gradually. Just before the next HD session on the 13th day of admission, his serum phosphate concentration was 4.6 mg/dL. On the 14th day after admission, only 75% stenosis of the right coronary artery (posterior descending artery) was shown by coronary angiography. It was not regarded as a cause of his arrhythmia. From the 11th day after admission, VT was never observed on continuous ECG monitoring. On the 16th day after admission, he was discharged. He then returned home.
Table 1

Serum potassium and phosphate level 6 weeks before admission and post-admission day 10

 

6 weeks before admission

Post-admission day 3 (first session after admission)

Post-admission day 10

Post-admission day 13

Pre-HD

Post-HD

Pre-HD

Pre-HD

Post-HD

Pre-HD

Post-HD

Hemoglobin (g/dL)

11.9

13.0

9.8

10.5

NA

10.2

NA

Potassium (mEq/L)

5.3

3.8

5.6

3.8

3.7

4.5

3.6

Phosphate (mg/dL)

6.1

2.2

NA

7.3

1.9

4.6

1.6

Calcium (mg/dL)

8.1

9.9

NA

8.1

8.5

8.5

9.0

Magnesium (mg/dL)

NA

NA

NA

NA

1.7

2.4

NA

Albumin (g/dL)

3.5

NA

3.2

3.0

NA

2.9

NA

Pre-HD and post-HD respectively denote laboratory data obtained before and after hemodialysis

NA not available

Indication for IDPN

IDPN is a method of parenteral nutrition through the venous drip chamber of the hemodialysis circuit used while the patient was receiving hemodialysis [5]. IDPN has been proposed to improve the nutritional status of malnourished patients on chronic hemodialysis. Some guidelines refer to indication of IDPN. Table 2 presents the IDPN indication criteria suggested in the representative guidelines: the British Columbia Renal Agency (BC Renal Agency) [5], European Renal Association–European Dialysis and Transplant Association (ERA-EDTA) [6], and the German Society of Nutrition [7]. These guidelines recommend that nutritional assessments be done using serum albumin, weight loss, subjective global assessment (SGA), oral protein and calorie intake, and so on for defining malnutrition. Most indication criteria of IDPN overlap those of protein-energy wasting (PEW) proposed by the International Society of Renal Nutrition and Metabolism (ISRNM) in 2008 [8]. Before considering IDPN, these guidelines above emphasize that clinicians should deal with underlying causes of malnutrition and then attempt to increase patients’ oral intake with oral nutritional supplements including tube feeding. IDPN is a treatment option for malnourished patients only when these attempts have failed. Moreover, BC Renal Agency and ERA-EDTA state that patients receiving IDPN should have some oral intake: patients can take over 50% of caloric needs in BC Renal Agency guideline and greater than 0.8 g protein/kg ideal body weight (IBW) and greater than 20 kcal/kg IBW in the European Best Practice Guidelines (EBPG). The guidelines imply that patients who have little or no oral intake are not candidates for IDPN, therefore meaning that IDPN is not recommended for patients with high risk of refeeding syndrome. Actually, the BC Renal Agency guideline states the potential metabolic complications of IDPN which include electrolyte abnormalities associated with refeeding and recommends routine monitoring of potassium, magnesium, and phosphorus.
Table 2

Indication criteria of IDPN proposed in guidelines

 

BC Renal Agency 2007, updated in 2014

The German Society of Nutrition 2009

European Best Practice Guidelines on hemodialysis from ERA-EDTA 2007

Serum albumin

3-month average < 3.4 g/dL

3-month average < 3.4 g/dL

 

Weight loss

> 10% of IBW or UBW

> 10% of IBW or 20% of UBW

 

SGA

B or C indicating moderate to severe malnutrition

C indicating severe malnutrition

 

Oral protein intake

< 1.0 g/kg

< 0.8 g/kg

> 0.8 g protein/kg IBW

Oral calories intake

< 25 kcal/kg, can take ≥ 50% of needs orally

< 25 kcal/kg

> 20 kcal/kg IBW

Others

Documented diagnosis of a gastrointestinal disorder

3-month rolling average predialysis serum creatinine < 8.0 mg/dL

 

BC Renal Agency, British Columbia Renal Agency, ERA-EDTA European Renal Association–European Dialysis and Transplant Association, IBW ideal body weight, SGA subjective global assessment, UBW usual body weight

Efficacy of IDPN

Although the indication of IDPN in malnourished hemodialysis patients is demonstrated, little is known about the benefits of IDPN, especially in terms of mortality and morbidity (e.g., infectious complications, hospitalization). Although several reports of the relevant literature describe randomized controlled trials that have been conducted to evaluate the efficacy of IDPN [9, 10], only the French Intradialytic Nutrition Evaluation Study (FineS) evaluated the effects of IDPN on mortality [9]. The left column of Table 3 presents a summary of FineS. FineS compared two treatment arms: oral nutritional supplements with and without IDPN. In FineS, unfortunately, the addition of IDPN did not improve the 2-year patient survival. In fact, the execution of FineS included several factors that might have reduced the benefits of IDPN. First, the sample size in the study was small. Secondly, both arms were intervened with oral supplement and demonstrated improved BMI, serum albumin, and prealbumin from baseline. Therefore, it was considered that FineS was underpowered to detect additional effects of IDPN on mortality. Nonetheless, FineS elucidated serum prealbumin increase > 30 mg/L during the first 3 months after starting nutritional treatment as an independent prognostic factor.
Table 3

Representative randomized controlled trials for IDPN

 

FineS trial 2007

German IDPN trial 2017

Inclusion criteria

 Age

18–80 years old

> 18 years old

 Hemodialysis vintage

> 6 months

> 6 months

 BMI

< 20 kg/m2

 

 BW loss within 6 months

> 10%

 

 Serum albumin

< 3.5 g/dL

< 3.5 g/dL

 Serum prealbumin

< 30 mg/dL

< 25 mg/dL

 SGA

 

B or C

Exposure

IDPN with oral nutritional supplements for 1 year

IDPN (3 times per week) with standardized nutritional counseling over 16 weeks

Comparison

Oral nutritional supplements only

Standardized nutritional counseling only

Outcome

IDPN did not have additional benefit on 2-year all-cause mortality

IDPN significantly increased prealbumin (changes in serum prealbumin from baseline to week 16) (p = 0.02)

BMI body mass index, BW body weight, IBW ideal body weight, SGA subjective global assessment

After FineS, the German IDPN-Trial group conducted a randomized trial to investigate the impact of IDPN to the changes of serum prealbumin [10]. Maintenance hemodialysis patients with PEW were assigned randomly to two groups with or without IDPN in addition to standardized nutritional counseling over 16 weeks. In the full analysis set consisting of 83 patients, the mean increase in serum prealbumin after 16 weeks was 26.31 mg/L (± 58.66 mg/L) in the 39 patients receiving IDPN compared with a decrease of 1.84 mg/L (± 49.35 mg/L) in the 44 patients of the control group (p = 0.02). Results show that the German IDPN-Trial group revealed the efficacy of IDPN for improvement of nutritional status and that IDPN might improve prognosis of patients with malnutrition.

Diagnosis of refeeding syndrome

Refeeding syndrome is a potentially fatal electrolyte shift in patients with rapid feeding after low-calorie intake. Classically clinical features of refeeding syndrome include salt and water retention, hypokalemia caused by rapid cellular uptake of potassium as glucose and amino acids taken up during cellular synthesis (state of anabolism), hypophosphatemia because of increased phosphorylation of glucose, rapid depletion of thiamine, and hypomagnesemia caused by cellular uptake [11]. As consequences of these metabolic abnormalities, multi-organ complications such as heart failure, arrhythmia, respiratory failure, and Wernicke’s encephalopathy can occur and cause death. Although Rio et al. proposed diagnostic criteria [12], it is difficult to define refeeding syndrome precisely because of the wide spectrum of the clinical entity of refeeding syndrome, extending from asymptomatic chemical abnormalities to life-threatening conditions. From this viewpoint, Stanga et al. proposed the two distinguishing concepts of symptomatic refeeding syndrome and potential or biochemical refeeding syndrome [11]. One diagnostic criterion presented by Rio et al. above requires fulfillment of three features: (1) electrolyte abnormalities including severe hypokalemia (< 2.5 mmol/L), hypophosphatemia (< 0.32 mmol/L, i.e., < 1.0 mg/dL), and hypomagnesemia (< 0.5 mmol/L, i.e., < 1.2 mg/dL); (2) peripheral edema or acute circulatory fluid overload; and (3) disturbance of organ function including cardiac failure and pulmonary edema. Rio’s criteria are regarded as symptomatic refeeding syndrome in Stanga’s review. By contrast, using a potential or biochemical refeeding syndrome, physicians would be expected to detect early signs of refeeding syndrome and act without delay to prevent emergence of the symptomatic features. Some nutritional studies related to preventing refeeding syndrome or early intervention against refeeding syndrome employ hypophosphatemia as an inclusion criterion: “refeeding hypophosphatemia” [13, 14]. The cutoff of serum phosphate concentration for hypophosphatemia in these studies were < 0.65 mmol/L (< 2.0 mg/dL), although the cutoff was determined arbitrarily. As De Silva et al. pointed out, renal dysfunction might hide refeeding hypophosphatemia. Refeeding hypophosphatemia might be underdiagnosed because baseline serum phosphates are higher in some patients requiring renal replacement therapy or with acute kidney injury (AKI)/chronic kidney disease (CKD) than in the general population [3].

It is noteworthy that the guidelines [57] presented in our earlier chapter do not indicate details of a diagnostic definition of refeeding syndrome or “relative” hypophosphatemia specifically in hemodialysis patients. Nor do they explain risk assessment of refeeding syndrome before IDPN starts.

Prevention and treatment of refeeding syndrome

For prevention and treatment of refeeding syndrome, clinicians should always assess the risk of developing refeeding syndrome when considering starting nutritional support. The National Institute for Health and Care Excellence (NICE) guideline in 2006 introduced the criteria to identify patients at high risk of developing refeeding problems [15]. The criteria consist of the body mass index (BMI), the degree of weight loss, duration of little or no nutritional intake, and other risk factors of refeeding syndrome: history of diuretics, chemotherapy, antacids, and alcohol or drug abuse, including insulin. Similarly, the Irish Society for Clinical Nutrition and Metabolism (IrSPEN) guidelines in 2013 provided criteria for the identification of patients at risk of refeeding syndrome [14, 16]. They presented three categories based on risk factors: moderate, high, and extremely high. It is noteworthy that both guidelines suggest only 5 days of little or no nutritional intake as a risk factor of refeeding syndrome. Some earlier reports have described lower prealbumin before nutritional support as a predictor of refeeding syndrome [17]. Measurement of prealbumin before nutritional support can facilitate the prediction of refeeding syndrome.

Purhassan et al. used NICE criteria to investigate the share of patients at risk of refeeding syndrome in the geriatric acute care ward [15]. They reported 69.9% of geriatric hospitalized patients (mean age of 83.1 ± 6.8 years) at risk of refeeding syndrome. One must be aware that “refeeding syndrome at risk” is common especially in elderly patients. One should meticulously assess the risk of refeeding syndrome before nutritional support.

The speed of nutritional administration is an important factor associated with the incidence of refeeding syndrome. Guidelines published by IrSPEN demonstrate how clinicians initially adjust the speed of nutrition support according to the concrete risk stratification [18]: 20 kcal/kg/day for moderate risk, 10 kcal/kg/day for high risk, and 5 kcal/kg/day for extreme high risk. NICE guidelines recommend the increase of levels slowly to meet full needs by 4–7 days or sooner [15].

After starting nutritional administration, monitoring and management of electrolyte abnormalities should be maintained over subsequent days. After starting feeding with sufficient thiamine supplements, serum electrolytes and especially phosphorus should be monitored closely to detect biochemical refeeding syndrome before fatal complications such as cardiovascular collapse develop. Appropriate and prompt supplementation of deficient electrolytes should be done according to serum concentrations. In patients at extremely high risk, monitoring cardiac rhythm continuously is recommended in these guidelines [13].

Management of hypophosphatemia because of refeeding syndrome is often necessary. Intravenous replacement of phosphate is performed in general. The Refeeding Syndrome Trial Investigators Group conducted a randomized controlled trial in an ICU setting for a caloric strategy during the management of refeeding syndrome: serum phosphate concentration decreased to less than 0.65 mmol/L (2.0 mg/dL) within 72 h after starting nutritional support [19]. Patients with refeeding hypophosphatemia were divided into two groups: reduced and non-reduced caloric intake groups. Although phosphate supplementation was conducted for both groups, caloric intake restriction improved patient survival significantly at day 60 (91% vs. 78%). The authors suggested caloric restriction as a therapeutic option for critically ill patients who develop refeeding hypophosphatemia. A slow increment of caloric intake and even intentional reduction of caloric intake should be considered for treating refeeding hypophosphatemia.

Discussion and conclusions

In our case, the VT during HD was thought to be triggered by hypokalemia that resulted from intracellular shift by refeeding syndrome in addition to removal by HD. Potential contribution of refeeding syndrome related to IDPN for the VT was considered based on the following two reasons. First, the serum phosphate concentration decreased substantially from 7.3 to 1.9 mg/dL during the HD session in which IDPN fluid was administered. It decreased from 6.1 to 2.2 mg/dL on his stable status despite nearly equal dialysis efficiency. The decline in serum phosphate during HD on the 10th day was higher than that on the usual HD session, even though the post-HD phosphate concentration does not meet the criteria of hypophosphatemia (1.85 mg/dL). In addition to removal by HD, intracellular shift of phosphate caused by high-calorie parenteral nutrition during the short period can contribute to a rapid decline of the serum phosphate concentration. Second, VT and QTc prolongation were cue findings prompting consideration of refeeding syndrome. Actually, QTc prolongation associated with HD depends in part on the concentration of potassium in the dialysate [20]. An earlier report described gradual lowering of the serum potassium concentration as preferred to prevent arrhythmia, rather than rapid lowering using dialysate with constant potassium concentration of 2.0 mEq/L. In the present case, IDPN can contribute to the intracellular shift of potassium and can therefore accelerate hypokalemia during HD.

Negative potassium balance resulted from both fasting without supplementation and removal by HD might also contribute to cause the VT. When long-term fasting is required, essential elements including potassium, phosphorus, and magnesium should be given even for dialysis patients. In our case, although serum potassium level was within the normal range before the HD session, it falls into hypokalemic range during the HD on the 10th day of the admission. Timely supplementation of essential elements including adjusting potassium concentration in dialysate (3.0–4.0 mEq/L) may prevent refeeding syndrome.

We cannot completely exclude the possibility of “idiopathic” VT unrelated to IDPN and HD. However, because continuous ECG monitoring did not detect VT recurrence after supplementation of essential elements, it is reasonable to consider that the VT was triggered by electrolyte abnormalities such as hypokalemia and hypomagnesemia exacerbated by IDPN and HD.

On the 10th day of admission, our patient was categorized as being at high risk of developing refeeding syndrome because he had been supplied only approximately 100 kcal/day for 10 days. Therefore, if our patient started to take a 10-kcal/kg/day nutrient supply, then the appropriate administration rate of IDPN would be 20–25 kcal/h based on the assumption that the nutritional supply per day was divided over 24 h. However, the actual rate of IDPN was 240 kcal/h, which was 10 times higher than the recommended amount. Based on the risk stratification of refeeding syndrome, total parenteral nutrition with a slow rate of calorie infusion, instead of IDPN, would be preferred, especially for patients ending a considerable period of fasting. If IDPN must be selected for such patients, its starting dose should be reduced.

In conclusion, we experienced a patient with refeeding syndrome accompanied with VT triggered by IDPN starting after starvation. When IDPN for malnourished HD patients is considered, the risk of refeeding syndrome should be fully assessed and managed before starting IDPN.

Abbreviations

AKI: 

Acute kidney injury

BC Renal Agency: 

The British Columbia Renal Agency

BMI: 

Body mass index

CKD: 

Chronic kidney disease

EBPG: 

European Best Practice Guidelines

ERA-EDTA: 

European Renal Association–European Dialysis and Transplant Association

HD: 

Hemodialysis

IBW: 

Ideal body weight

IDPN: 

Intradialytic parenteral nutrition

IrSPEN: 

The Irish Society for Clinical Nutrition and Metabolism

ISRNM: 

The International Society of Renal Nutrition and Metabolism

NICE: 

The National Institute for Health and Care Excellence

PEW: 

Protein-energy wasting

QTc: 

Corrected QT interval

SGA: 

Subjective global assessment

UBW: 

Usual body weight

VT: 

Ventricular tachycardia

Declarations

Acknowledgements

The authors express their appreciation to the medical staff of the University of Tokyo Hospital, Tokyo, Japan, for collecting the samples from the patient and for analyzing them.

Availability of data and materials

All data and materials were included in the manuscript.

Authors’ contributions

YH is responsible for the manuscript. YH and YM acquired the data, interpreted the data, drafted the manuscript, and revised it. AM, KD, and MN helped to draft the manuscript. All authors read and approved the final manuscript.

Ethics approval and consent to participate

Written informed consent was obtained from the patient. For this type of case report, formal consent from a local ethics committee is not required.

Consent for publication

Written informed consent was obtained from the patient for the publication of this case report and any accompanying images.

Competing interests

The authors declare that they have no competing interests.

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Authors’ Affiliations

(1)
Department of Hemodialysis and Apheresis, The University of Tokyo Hospital, Tokyo, Japan
(2)
Division of Nephrology and Endocrinology, The University of Tokyo, Tokyo, Japan
(3)
Department of Acute Medicine, The University of Tokyo Hospital, Tokyo, Japan

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© The Author(s) 2018

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