From malnutrition to refeeding during anorexia nervosa

Evaluation of muscle-skeletal strength and peak expiratory flow in severely malnourished inpatients with anorexia nervosa: A pilot study

OBJECTIVES

Anorexia nervosa is a complex psychiatric disorder that can lead to specific somatic complications. Malnutrition is frequent and can involve a decrease of mobility, up to functional impotence, in individuals with extremely severe cases. The aim of this pilot study was to examine muscle strength and peak expiratory flow (PEF) in severely undernourished patients with anorexia nervosa at admission and after 5 wk of renutrition by tube feeding, and to find the clinical and biological correlates of muscle-strength impairment.

METHODS

A prospective observational study was conducted over 6 mo. Manual muscle testing, measures of PEF, and clinical and biologic assessments were performed at baseline and after 5 wk of renutrition.

RESULTS

Twenty-three extremely malnourished female participants (mean body mass index: 11.4 ± 1.3 kg/m²) were included. All participants had global impairment in muscle strength (manual muscle testing: 37.7 ± 7.7) and PEF (253.3 ± 60 mL/min) at admission. Muscle weakness was higher in axial than peripheral muscle groups (P < 0.01), with no significant difference between proximal and distal muscles (P > 0.05). Muscle strength at admission was significantly associated with severity of undernourishment (body mass index and albumin) and transaminitis (P < 0.05). At follow-up, musculoskeletal strength and PEF were significantly improved after partial weight recovery (P < 0.01).

CONCLUSIONS

Extremely undernourished people with anorexia nervosa present a decrease of PEF and musculoskeletal strength predominant on axial muscles. Both are associated with severity of malnutrition and liver damage. Partial recovery was observed after 5 wk of enteral nutrition.

Echocardiographic abnormalities in 124 severely malnourished adult anorexia nervosa patients: frequency and relationship with body composition and biological features

BACKGROUND

Anorexia Nervosa (AN) is a complex psychiatric disorder that can lead to specific somatic complications. Heart abnormalities are frequently reported, while their frequency and associated factors in severely malnourished AN patients remain poorly defined.

OBJECTIVES

This study aimed to characterize echocardiographic abnormalities in severely malnourished AN patients and to assess associated clinical, biological and related body composition features.

METHODS

Between January 2013 and January 2015, all severely malnourished adult patients with AN (Mental Disorders, 4th Edn.-DSM IVr) were included in a monocentric study performed in in a highly specialized AN inpatient unit. Electrocardiogram (ECG) and echocardiography were used to assess both heart rhythm and function. All inpatients underwent a Doppler echocardiography procedure after undergoing combined blood volume adjustment, micronutrients deficiencies supplementation and electrolyte disorders correction. Right Ventricular (RV) and Left Ventricular (LV) systolic and diastolic functions were collected and compared to 29 healthy normal subjects in a control group.

RESULTS

One hundred and 24 patients (119 (96%) women, 5 (4%) men) with a mean age of 30.1 ± 11 years old and an average Body Mass Index (BMI) of 12 kg/m² were included. Ninety patients (73%) had been diagnosed with AN Restrictive type (AN-R), 34 (27%) an AN Binge eating/Purging type (AN-BP). Eighteen patients (15%) disclosed an abnormal Left Ventricular Ejection Fraction (LVEF) (< 52% for male and < 54% for female). LVEF impairment was associated with AN-BP patients (p < 0.017) and hypertransaminasemia (AST and/or ALT ≥2 N) (p < 0.05). Left Ventricular mass (LV mass) and Left Ventricular End Diastolic Diameter (LVEDD) were significantly reduced in patients (p < 0.001, p < 0.001). Left and right ventricular tissue Doppler Imaging Velocities (TDI) peak were reduced in patients: Septal and Lateral LV Sm velocities peaks respectively 10 ± 2 cm/s (vs 14 ± 2 cm/s in controls, p < 0.001), 12 ± 3 cm/s (vs 16 ± 3 cm/s in controls, p < 0.001), basal RV Sm velocity peaks at 14 ± 3 cm/s (vs 19 ± 3 cm/s in controls, p < 0.001). Additionally, LV and RV diastolic velocity peaks were reduced: LV septal and lateral velocity peaks were respectively 13 ± 3 cm/s (vs 18 ± 2 cm/s p < 0.001), 12 ± 3 cm/s (vs 22 ± 4 cm/s, p < 0.001) and RV diastolic velocity peaks at 14 ± 3 cm/s (vs 21 ± 4 cm/s p < 0.001). LV diastolic velocity TDI peaks were significantly associated with hypertransaminasemia (p < 0.05) and tended to be associated with a low all body Fat-Free Mass Index (FFMI) (using Dual-energy X- ray Absorptiometry (DXA) (HOLOGICQDR 4500) (p = 0.056). Thirty-four patients (27%) had a pericardial effusion and were significantly associated with a decreased all body FFMI (p < 0.036).

CONCLUSION

Heart abnormalities are frequent in malnourished patients with AN, particularly in AN-BP type. Both liver enzymes and body composition abnormalities tended to be associated with heart dysfunction (non-significant association). Prospective studies are needed to better characterize and describe the evolution of cardiac abnormalities during the refeeding period and subsequent weight restoration.

Refeeding Syndrome and Hypophosphatemia

Hypophosphatemia is a potentially life-threatening complication of reinstating nutrition in a malnourished patient. Refeeding syndrome is a term that refers to various metabolic abnormalities that may complicate carbohydrate administration in subnourished patient populations. Hypophosphatemia is the most well-known, and perhaps most significant, element of the refeeding syndrome and may result in sudden death, rhabdomyolysis, red cell dysfunction, and respiratory insufficiency. This review briefly examines refeeding-induced hypophosphatemia in the hospitalized patient in hopes of making clinicians more aware of this common, but often overlooked, potentially dangerous problem.

Comparison of standardized versus individualized caloric prescriptions in the nutritional rehabilitation of inpatients with anorexia nervosa

OBJECTIVE

Sparse research informs how caloric prescriptions should be advanced during nutritional rehabilitation of inpatients with anorexia nervosa (AN). This study compared the impact of a standardized caloric increase approach, in which increases occurred on a predetermined schedule, to an individualized approach, in which increases occurred only following insufficient weight gain, on rate, pattern, and cumulative amount of weight gain and other weight restoration outcomes.

METHOD

This study followed a natural experiment design comparing AN inpatients consecutively admitted before (n = 35) and after (n = 35) an institutional change from individualized to standardized caloric prescriptions. Authors examined the impact of prescription plan on weekly weight gain in the first treatment month using multilevel modeling. Within a subsample remaining inpatient through weight restoration (n = 40), multiple regressions examined the impact of caloric prescription plan on time to weight restoration, length of hospitalization, maximum caloric prescription, discharge BMI, and incidence of activity restriction and edema.

RESULTS

There were significant interactions between prescription plan and quadratic time on average weekly weight gain (p = .03) and linear time on cumulative weekly weight gain (p < .001). Under the standardized plan, patients gained in an accelerated curvilinear pattern (p = .04) and, therefore, gained cumulatively greater amounts of weight over time (p < .001). Additionally, 30% fewer patients required activity restriction under the standardized plan.

DISCUSSION

Standardized caloric prescriptions may confer advantage by facilitating accelerated early weight gain and lower incidence of bedrest without increasing the incidence of refeeding syndrome.

Renal complications in anorexia nervosa

PURPOSE

Anorexia nervosa is a malady with possible long-lasting physiological consequences. Among these, little is known about the renal effects, which remain rarely investigated.

METHODS

A literature review was conducted using electronic databases and manual search of relevant articles, discussing the renal impacts of anorexia nervosa.

RESULTS

Renal failure has been described in malnourished patients, but the optimal non-invasive tool to assess the glomerular function rate in this population needs to be further evaluated. Significant disruptions in osmolar regulation, even in the absence of potomania, arise from multiple factors: hypothalamic dysfunction, intrinsic renal insufficiency, and use of psychotropic medications. Urinary urgency and nocturnal enuresis are frequent symptoms, rarely reported by patients. Among hydroelectrolytic disorders, hypokalemia is the most frequent, especially in settings of vomiting or medication misuse. Hyponatremia, hypomagnesemia, and hypophosphatemia may also be encountered. Urinary lithiases are relatively frequent as a consequence of dehydration, laxative use, or both.

CONCLUSION

Investigation and follow-up of the renal function are essential in patients with an eating disorder, especially when the illness has been present for a long time.

Hypertransaminasemia in severely malnourished adult anorexia nervosa patients: risk factors and evolution under enteral nutrition

BACKGROUND & AIMS

Aminotransferase abnormalities have been reported in malnourished patients with anorexia nervosa (AN). The aim of this study was to identify prevalence and risk factors of hyperaminotransferasemia in an adult cohort of AN patients and to describe evolution during nutritional rehabilitation with enteral nutrition for a period of 4 weeks.

METHODS

Retrospective study of all consecutive malnourished (BMI <16) AN adult patients, without previous liver diseases or hepatotoxic drugs or alcohol consumption, hospitalized for enteral nutrition in a single center between 1998 and 2008. Hypertransaminasemia was defined by an increase in AST and (or) ALT >2N.

RESULTS

In all, 126 AN patients (117 W, 9 M), age 30 ± 10.8 years, were included. At admission, 54 (43%) patients presented hypertransaminasemia. In univariate analysis, risk factors for hypertransaminasemia were: lower BMI (11.2 ± 2 vs. 13 ± 2, p < 0.0001) and age (28 ± 9 vs. 32 ± 12, p < 0.05), male sex (p < 0.05) and the pure restrictive form (p = 0.07). In multivariate analysis only BMI, at a threshold of 12, remained significant [OR 3.7, CI: 95% 2.24-5.2]. Normalization of aminotransferases at the end of week 4 of enteral nutrition was obtained in 96%. Only 2/54 patients (4%) presented a worsening of aminotransferases during the refeeding period, including one that died of liver failure. None of the patients without hypertransaminasemia admission presented a subsequent elevation. At the end of the 4-week refeeding period, the increase in BMI was greater in patients without hypertransaminasemia than in those with it (2.0 ± 0.8 vs. 1.5 ± 1.0, p < 0.0001).

CONCLUSION

Elevated transaminases is common in severe malnourished AN patients. Four risk factors were identified: young age, low BMI (the only independent factor in multivariate analysis), the pure restrictive form of the disease and male sex. After 4 weeks of enteral nutrition the evolution is in most cases favourable, albeit with a lower increase in BMI, but can be severe. The long-term evolution remains to be determined.

Predicting the value of the Mini Nutritional Assessment (MNA) as an indicator of functional ability in older Iranian adults (Kahrizak elderly study)

OBJECTIVE

We aimed to investigate the appropriateness of the Mini Nutritional Assessment (MNA) in predicting functional ability in older adults.

DESIGN

Cross-sectional study.

SETTING

Participants were recruited from the Kahrizak Charity Foundation (KCF).

MEASUREMENTS

Nutritional and ability status were examined using the MNA and the Barthel Index (BI). Participants were divided according to MNA (≤ 23.5 and > 23.5).

RESULTS

Two hundred and thirty-five ≥ 60-year-old subjects were studied. The MNA and BI were positively correlated (r = 0.199; P = 0.001). The optimal cut-off point for BI with the highest sensitivity and specificity derived from the ROC curve was approximately 91.5 for males and 83.5 for females. The BI was significantly associated with MNA (odds ratio (OR): 1.89; 95% CI: 1.17-3.05, P = 0.009), mobility (OR: 6.39; 95% CI: 3.43-11.89, P < 0.001), consuming ≥ 2 servings of fruit and vegetables (OR: 2.27; 95% CI: 1.09-4.72, P = 0.02) and self-view of nutritional status (OR: 4.15; 95%CI: 1.26-13.63, P = 0.01). The sensitivity (62.9% in males; 68.2% in females) and specificity (51.4% in males and 52.9% in females) of these cut-off points justifies the appropriateness of the MNA for determining functional ability.

CONCLUSION

The MNA is potentially able to verify functional status among the elderly (as BI ≥ 91.5 with those of < 91.5 in males and ≥ 83.5 with those of < 83.5 in females) of KCF. It is suggested that this relationship should be further studied in a larger prospective population-based study.

Dangers, and benefits of the cytokine mediated response to injury and infection

The inflammatory response is essential for survival in an environment where continuous exposure to noxious events threaten the integrity of the organism. However, the beneficial effects of the response are influenced by factors, which disadvantage individuals within a population. These factors include malnutrition, infection, genotype, gender, pre-existing inflammation, and chronic intoxication. Although the inflammatory response is generally successful in dealing with noxious events, life-long exposure to these events takes its toll on the integrity of the body and becomes apparent as chronic disease, atherosclerosis, organ failure, and frailty. Progress in ameliorating the consequences of lifetime exposure to inflammatory events can only occur if a fuller understanding can be obtained of the factors, which influence the persistence and outcome of the inflammatory response at an individual level. A multitude of studies has shown that specific nutrients, diets, and dietary restriction are able to modulate the inflammatory response in the population as a whole. To advance in this area, precise knowledge is needed of how the disadvantageous factors, mentioned above, affect the individual's response to anti-inflammatory nutrients.

Refeeding syndrome in cancer patients

BACKGROUND

Refeeding syndrome (RFS) is a common, yet underappreciated, constellation of electrolyte derangements that typically occurs in acutely ill, malnourished hospitalised patients who are administered glucose solutions or other forms of intravenous or enteral nutrition.

DISCUSSION

The hallmark of RFS is hypophosphataemia, but hypokalaemia and hypomagnesaemia are also common. Patients with various types of malignancies are at-risk for RFS, but very little exists in the oncologic literature about this disorder.

CONCLUSIONS

As RFS can have many adverse metabolic, cardiovascular, haematologic and neurologic complications, practicing oncologist needs to be aware of the pathophysiology, risk factors and clinical manifestations to promptly recognise this important, and potentially fatal, metabolic disorder.

Cholinesterase and other serum liver enzymes in underweight outpatients with eating disorders

OBJECTIVE

The present study aimed to evaluate serum liver enzymes in underweight outpatients with anorexia nervosa (A-NERV) or eating disorders not otherwise specified (EDNOS).

METHOD

Serum alanine amino transferase (ALT), aspartate amino transferase (AST), lactic dehydrogenase (LDH), gamma glutamyl transferase (GGT), alkaline phosphatase (ALP), and cholinesterase (CHE) were determined in 97 patients with A-NERV, 66 patients with EDNOS, and 56 controls.

RESULTS

In the A-NERV group AST, LDH, and GGT were higher, as compared with controls, and inversely related to weight, while ALP and CHE were lower. AST and GGT increased and CHE decreased in patients with EDNOS. Hypertransaminasemia occurred in 14.4 and 15.2%, and low CHE in 29.9% of the A-NERV group and 13.6% and EDNOS group, respectively. Three or more abnormalities were found in 9.3% of patients with A-NERV and 7.5% of those with EDNOS.

CONCLUSION

Abnormalities in serum liver enzymes are common in outpatients with eating disorders plus underweight. CHE might be considered as a marker of the effects of primary malnutrition on liver function.

Assessing the metabolic and clinical consequences of early enteral feeding in the malnourished patient

BACKGROUND

It is often thought that enteral feeding should be initiated slowly in those who are severely malnourished. This descriptive study examined the effect of an enteral feeding protocol on the typical metabolic consequences seen in refeeding syndrome.

METHODS

A retrospective chart review was conducted on 51 patients who had been placed on hospital-wide enteral feeding and electrolyte replacement protocols over a 9-month period to determine whether there were any negative clinical consequences to early feeding.

RESULTS

Goal feeding rate was achieved within 17.6 +/- 8.7 hours. Forty patients (80%) developed depletions in phosphate, magnesium, or potassium after initiation of enteral feeding, including 93% of those deemed "at risk" and 74% of those "not at risk." All patients received electrolyte replacement according to protocols, and no patients showed any negative clinical effect.

CONCLUSIONS

This study showed that malnourished patients at risk for refeeding syndrome can be fed early without observed negative clinical consequences. An electrolyte replacement protocol may be an effective means of minimizing the electrolyte imbalances associated with early feeding. It also demonstrated the significance of applying such protocols to all patients requiring enteral support, as current methods of assessing "risk"for refeeding syndrome may be inadequate.

Disorders of Fuel Metabolism: Medical Complications Associated with Starvation, Eating Disorders, Dietary Fads, and Supplements

Disorders of fuel metabolism as they relate to abnormal fuel intake,abnormal fuel expenditure, and dietary supplements are the focus of this article. The emergency physician should be aware of the medical complications that can occur as a result of starvation states,eating disorders, fad diets, hypermetabolic states, and ergogenic aids. Knowledge and understanding of the complications associated with these disorders will facilitate the diagnosis and management of patients who present to the emergency department with any of the disorders reviewed.

Síndrome de realimentación. Revisión

Refeeding syndrome is a complex clinical picture that encompass all those alterations that can occur as a consequence of the nutritional support (oral, enteral or parenteral) in malnourished patients. Refeeding syndrome is classically characterized by neurological alterations, respiratory symptoms, cardiac arrhythmias and heart failure few days after beginning of refeeding, with life-threatening outcome. Its pathogenesis includes alterations in the corporal fluids, and in some electrolytes, minerals and vitamins. In this article a review of refeeding syndrome pathogenesis and clinical manifestations is carried out, with a final series of recommendations for lowering the risk of this syndrome and for facilitate the early diagnosis and the treatment.

Refeeding Syndrome

Patients admitted to inpatient rehabilitation units commonly have underlying medical disorders and are at risk for poor oral intake and malnutrition, which may be compounded by dysphagia and anorexia. The refeeding syndrome is an underappreciated but clinically important entity characterized by acute electrolyte abnormalities, fluid retention, and dysfunction of various organ systems, which can result in significant morbidity and, occasionally, death. Reinstitution of nutrition by any route in a undernourished patient may lead to acute electrolyte shifts and fluid retention, which are hallmarks of the refeeding syndrome. As such, this article briefly summarizes the clinical manifestations and treatment of refeeding syndrome as it relates to patients admitted to the inpatient rehabilitation unit.

Elevated physical activity and low leptin levels co-occur in patients with anorexia nervosa

Low leptin levels are an endocrinological hallmark of acute anorexia nervosa (AN); a subthreshold leptin secretion in adipocytes as a consequence of a reduced energy intake is presumed to be the major trigger of the adaptation of an organism to semistarvation. The aim of the current study is to define symptoms of AN that are potentially linked to low leptin levels. For this purpose, quantitative somatic and psychopathological variables were obtained in 61 inpatients with acute AN (study group 1) upon referral for inpatient treatment, and they were concomitantly blood sampled to allow determination of serum leptin levels. Correlations between these variables and logarithmic transformed (lg10) leptin levels were descriptively assessed. Apart from the well-known correlations between leptin levels and anthropometric measurements, the strongest correlation was observed between lg10 serum leptin levels and expert ratings of motor restlessness (r = -0.476; nominal P = 0.003) upon use of visual analog scales. We thus generated the hypothesis that physical activity levels in AN patients are related to serum leptin levels. This hypothesis was tested in an independent study group of 27 adolescent inpatients (study group 2) who were also assessed upon referral. Physical activity levels, which, in this study group, were assessed with the activity module of the expert rating form of the Structured Inventory for Anorexic and Bulimic Syndromes, were significantly correlated with lg10 leptin levels (r = -0.51; one-sided P = 0.006). A regression model based on the independent variables body mass index and lg10 leptin levels explained 37% of the variance of physical activity (R(2) = 0.37; P = 0.003); only the lg10 leptin levels contributed significantly to the variance (P = 0.003). Our results suggest that, similar to semistarvation-induced hyperactivity in rats, hypoleptinemia in patients with AN may be one important factor underlying the excessive physical activity.

Anorexia nervosa medical issues

Anorexia nervosa is an increasingly common chronic psychiatric disorder with a multitude of medical complications. Most of these complications are reversible if there is timely restoration of body weight. A few of them, particularly osteoporosis, refeeding complications, and cardiac arrhythmia, are potentially much more serious. In the end, a multidisciplinary team approach with input from a primary care provider who is familiar with these medical sequelae, together with psychiatric and dietary expertise, can effectuate a successful outcome.

Silent pericardial effusion in a sample of anorexic patients

Mortality in anorexic patients is mainly due to suicide or cardiac failure. The aim of this study was to investigate structural and functional cardiovascular alterations further by means of echocardiography in a sample of 15 medication-free patients with DSM-IV anorexia nervosa (AN) (BMI < 17.5 kg/m2) and without any known cardiovascular disease and/or a family history of deafness or sudden death, and correlate the findings with clinical variables. The controls consisted of a sample of 10 constitutionally thin women (BMI < 19 kg/m2), of comparable age, height and degree of physical activity. All of the subjects underwent Doppler echocardiography (ECHO), and the patients were also administered the Diagnostic Schedule for Eating Disorders (DSED) in order to assess the features and course of the eating disorder. ECHO revealed silent pericardial effusion in 71.4% of the patients vs. 10% of the controls (p < 0.05); among the patients, the separation of pericardial leaflets was more frequent in those with a shorter duration of illness (p < 0.05). Mitral valve motion abnormalities were more frequent among the patients than the controls (69.2% vs. 10%, p < 0.005), and the left ventricular mass/body surface area was lower (54.8% vs. 59%, p < 0.001). Isovolumetric relaxation time was longer in the patients (98.4 vs. 65 msec, p < 0.01), but there were no significant differences in left ventricular ejection fraction (53.8% vs. 59%) or early diastolic deceleration time (146 vs. 155 msec). The results of this study support the association between AN and demonstrable anatomic and functional cardiac abnormalities, such as a reduced ventricular mass and mitral valve abnormalities. The ECHO findings provide evidence for clinically silent pericardial effusion in AN, which may be an early sign of cardiovascular involvement.

Anorexia nervosa: manifestations and management for the gastroenterologist

Anorexia nervosa is a complex psychiatric disorder with significant morbidity and mortality. It is important for gastroenterologists to be aware of the physiological effects and potential complications of anorexia nervosa, as they are frequently involved in treating patients with this disorder. We review the classic, GI, and neuroendocrinological features of anorexia nervosa. We also discuss gender differences and treatment options in anorexia nervosa. Further studies of GI physiology and pharmacology are needed to determine whether any disturbances may be amenable to therapeutic intervention. Future treatments directed at improving GI sensorimotor function and neurohormonal abnormalities in patients with anorexia nervosa may impact their nutritional rehabilitation and may have important health economic implications as patients avoid hospitalization and are restored to full activities in society. The current team approach, which incorporates psychiatrists, psychologists, nutritionists, pediatricians, internists, and gastroenterologists in the treatment of patients with anorexia nervosa, will continue to be essential.

The importance of the refeeding syndrome

In this review we discuss the refeeding syndrome. This potentially lethal condition can be defined as severe electrolyte and fluid shifts associated with metabolic abnormalities in malnourished patients undergoing refeeding, whether orally, enterally, or parenterally. It can be associated with significant morbidity and mortality. Clinical features are fluid-balance abnormalities, abnormal glucose metabolism, hypophosphatemia, hypomagnesemia, and hypokalemia. In addition, thiamine deficiency can occur. We describe which patient groups are more at risk for this syndrome and the clinical management of the condition.