ISSN: 2581-3870
Archives of Clinical Nephrology
Case Report       Open Access      Peer-Reviewed

Encapsulating Peritoneal Sclerosis: Case report and Current Status

Jacques Rottembourg* and Belkacem Issad

Department of Nephrology, Groupe Hospitalier Pitié-Salpêtrière, Paris, France
*Corresponding author: Jacques Rottembourg, Professor, Department of Nephrology, Groupe Hospitalier Pitié Salpêtrière, 83 boulevard de l’Hôpital, 75013 Paris, France, Email: jacques.rottembourg@wanadoo.fr
Published: 29 August, 2017 | Accepted: 04 October, 2017 | Received: 05 October, 2017

Cite this as

Rottembourg J, Issad B (2017) Encapsulating Peritoneal Sclerosis: Case report and Current Status. Arch Clin Nephrol 3(1): 039-046. DOI: 10.17352/acn.000025

Encapsulating peritoneal sclerosis (EPS), is a rare but devastating complication of long-term peritoneal dialysis (PD) with a high mortality rate. The incidence is between 0.5 and 3.3%, decreasing with time. EPS is defined as a clinical syndrome with major signs of gastrointestinal obstruction, inflammatory parameters, radiological and macroscopic changes. Duration of treatment and cessation of PD are the main risk for development of EPS: about 75% of EPS occurred in patients transferred on hemodialysis or in the two years after kidney transplantation. Morphological alterations are disappearance of mesothelial layer, sub-mesothelial fibrosis, interstitial sclerosis and vasculopathy, ultrafiltration failure, fast transport status of the peritoneal membrane, and loss of sodium sieving are the most predicting functional abnormalities. Some biomarkers could be found in the peritoneal effluent. The pathophysiology is probably a consequence of a multiple-hit process in which expression of growth factors and cytokines play a role. Medical strategies (corticosteroids, immunosuppressive drugs, tamoxifen) in association with parenteral nutrition and/or surgery (enterolysis) are discussed. Prevention is the use of physiological peritoneal solutions, icodextrine instead of high glucose concentration solution, and peritoneal lavage after peritoneal dialysis cessation for any reason.

Introduction

Encapsulating peritoneal sclerosis (EPS) is a rare cause of intestinal obstruction which is characterized by fibrotic encapsulation of the bowel due to a progressive intraabdominal inflammatory process. Firstly described by Owtschinnikow as “peritonitis chronica fibrosa incapsulata” in 1907 [1].With the development of continuous ambulatory peritoneal dialysis (CAPD) procedure in the late seventieth, this devastating complication was described by Gandhi [2], our team [3] and others [4,5]. In 2000 the International Society of Peritoneal Dialysis (ISPD) has defined EPS as a clinical syndrome with signs of intermittent and persistent or recurrent complaints of gastrointestinal obstruction with macroscopic and or radiological confirmation of sclerosis, calcified peritoneal thickening or encapsulation of the intestines. The presence of disturbed intestinal function, such as the clinical symptoms of partial or total obstruction is essential for the diagnosis [6]. These symptoms are caused by the development of a fibrosis cocoon that slowly covers the intestines and leads to obstruction, malnutrition, weight loss cachexia and death. Since then, others have attempted to modify this definition in order to provide a more specific framework for diagnosis [7].

Reported mortality rates for EPS are high (25-55%) especially during the first years following the development of PD as an alternative for Hemodialysis (HD) for the treatment of end stage renal disease (ESRD).The mortality increases also with the duration of treatment [8-12]. An overall increase in EPS incidence was observed (from 0.3% in 1996 to 3.5% in 2005) despite a decrease in the number of patients receiving PD treatment during the same period [10-12]. Several registries and study groups were set up to investigate this complication [13-17]. The overall incidence of EPS is around 2.5% [18], but some registries reported higher incidence: The Scotland Registry reported a cumulative incidence of 8.1% at eight years [12], and an Australian registry study, a cumulative incidence of 19.4% after eight years of PD treatment [8]. Similar findings were reported in a prospective study in which the incidence of EPS was 0.7% after five years, 2.1% after eight years, 5.9% after ten years and 17.2% after fifteen years of PD treatments [19].

This review describes a recent case of EPS in our team, and provides an overview of current knowledge about EPS, focusing on the considerable progress that has been made with regard to understanding the pathophysiology of peritoneal fibrosis and EPS. The emerging roles of different growth factors in these processes are highlighted and an update on the diagnosis and therapeutic options for EPS is provided.

Presentation Case

A 26 years old man suffering from interstitial nephropathy in relation with sarcoidosis received peritoneal dialysis (CAPD), then automated peritoneal dialysis (APD) from 2002 until 2009. The patient had during the PD period 3 histories of peritonitis and one catheter exit-site infection. The transfer from CAPD to APD was in relation with an ultrafiltration failure. Thereafter, as the patient moved in another city, a transfer from PD to HD was decided. At that time the patient asks to be on a kidney transplantation waiting list. With the transfer on HD, the patient loosed about 6 kg. Abdominal ultrasound, performed at that time, showed a normal abdominal cavity. Six months later, an inflammation status was present with non-specific symptoms such as abdominal pain, anorexia, nausea, diarrhea, defecation problems and weight loss. Biologically, signs of systemic inflammation were progressively present such as fever, leukocytosis, elevated C reactive protein, low serum albumin. The abdominal CT-scan revealed diffuse mild thickening and contrast enhancement of the peritoneum along with massive ascites in the peritoneal cavity. Peritoneal calcifications were also present. Jejunal and ileal loop walls appeared as thickened and edematous. After 6 days of parenteral nutrition and corticosteroids, it was decided to operate the patient because of the unresolved intestinal obstruction symptoms. At the explorative laparotomy performed end 2012, a classical EPS was found with ascites and a thick dense whitish membrane encasing the right colon and the intestine (Figure 1A). The membranous sac was excised from the surrounding intestine along with adhesiolysis (Figure 1B). No ileal injury was found despite a prolong dissection. Operative duration time was over five hours. The patient showed a significant recovery postoperatively and was discharged from the hospital uneventfully one week after. The histopathological evaluation of the membrane revealed fibrosis tissue with the absence of mesothelium and accompanied by massive collagen deposition, scattered mononuclear inflammatory cells and fibroblast proliferation. Three years after, the patient in good clinical conditions, could receive a kidney transplant without any clinical abdominal symptom.

Pathophysiology of EPS

Morphological alterations of the peritoneum: The healthy peritoneum consists of three parts: a monolayer mesothelial cells layer attached to a basement membrane. In between there is a sub-mesothelial contact zone which contains fibroblasts, macrophages, and blood vessels [20]. Alterations of the peritoneal structures are present at the uremic phase of ESRD, and continue during PD treatment [21]. During a PD treatment, even without any complication, the mesothelial layer gradually disappears, the peritoneal vasculature shows progressive medial fibrosis, and hyalinization conducting to deposition of collagen appears [22], the sub-mesothelial zone thickens as the result of interstitial fibrosis and sclerosis, composed of myofibroblasts and various types of collagen [23], new blood vessels are formed with the extension of the vasculopathy, in the same way than during diabetic retinopathy [24].

Moreover advance glycation end products (AGEs) accumulate in the mesothelial layer, sub-mesothelial layer and vascular wall in PD patients [25]. Deposition of AGEs is associated with the presence of peritoneal fibrosis and functional problems such as loss of ultrafiltration [26]. Whether AGEs cause peritoneal damage or are innocent bystanders is not yet really known. One hypothesis is that AGEs accumulation (in relation too with the use of high glucose concentration solutions) influences the permeability of blood vessel walls, which would explain the association between AGE accumulation and fast transport status or loss of ultrafiltration [27].

Simple sclerosis, which is characterized by thickening of the parietal peritoneum and vascular alterations in the absence of encapsulation, develops in the majority of patients treated by PD for a quite long period [28]. Once bowel encapsulation is present, the patient manifests the clinical symptoms of partial or total bowel obstruction that defines EPS.

Functional alterations of the peritoneum: Early studies described a decrease in ultrafiltration and increased peritoneal permeability in patients with EPS [29]. Ultrafiltration failure seemed to be the predominant early change in patients who are progressively developing EPS. Ultrafiltration capacities were lower in patients with EPS than in patients with a similar duration of PD who do not develop EPS [30]. Small solute transport increases in patients undergoing long-term PD treatment; free water transport also decreases in patients on long-term PD treatment in the years before onset of EPS [31]. These modifications indicate that a decrease in osmotic conductance might accompany the early stages of EPS, and could identify patients at risk of development of severe EPS, and might indicate that a switch to HD should be considered. But such a strategy was also considered as non-efficient [32].

Pathogenesis of EPS

Biomarkers in the effluent dialysate: CA125, Interleukine (IL)-6 are both biomarkers of the mesothelial cellular mass. Vascular endothelial growth factor (VEGF) has an important role in the proliferation and migration of endothelial cells during angiogenesis [33]. Human peritoneal mesothelial cells can produce VEGF in response to various stimuli present in the PD fluid [33]. Level of VEGF expression in peritoneal effluent showed a linear relationship with the duration of PD treatment [34]. This finding suggests that VEGF is important in the development of neo-angiogenesis and eventually in the development of EPS. In an animal model, exposure to high level of TGF-β led to simple sclerosis, whereas prolonged exposure led to neo-angiogenesis, extensive adhesions and cocooning or encapsulation of the intestines which seems to be similar to the features of EPS [35].

Epithelial-to-mesenchymal transition (EMT): This physiological process, under normal conditions, repairs damaged tissue throughout the body and also in the peritoneum. However, if uncontrolled, EMT can lead to initiation of fibrotic processes [36]. EMT is present in fibrotic peritoneal tissue from patients under PD predominantly in the sub-mesothelial layer [37]. In the peritoneal effluent some factors in favor with the development of EPS through EMT could be identified: high glucose concentration solutions, AGEs products, acid pH of some solutions, and some other growth factors. Although EMT is generally accepted to have a role in the development of EPS, its exact contribution to the processes underlying EPS remains unclear [38].

Theories on the pathogenesis of EPS:

The two-hit theory: The hypothesis of a two-hit theory, now generally accepted, proposes that two causative factors are required for the onset of EPS [39].The first hit occurs as a consequence of PD treatment, which causes disruption of normal peritoneal layer and mesothelial physiology. This damage occurs over several years of PD treatment. Some patients exposed to a second hit that triggers the development of EPS [40]. The second hit might be an infection such as a peritonitis, discontinuation of PD for any reason, or use of inadequate PD solutions [29].

Genetic predisposition: Genetic predisposition may induce the development of EPS in patients who have already peritoneal changes after several years of treatment: in the UK, a large database of DNA samples has been set up to study the genetic basis of this association [17]. In some patients, an association between the occurrence of EPS and Alport syndrome was observed, suggesting that Alport syndrome might predispose patients to EPS [41].

Diagnosis of EPS

Clinical diagnosis: The chronic and insidious development of this clinical syndrome is specific for EPS. As a consequence, EPS is often not recognized in the early stages. The first signs of EPS, as abdominal complaints (nausea, vomiting, diarrhea alterations in defecation, sub-occlusive periods) may be accompanied by increased levels of inflammatory markers or short period of blood-stained ascites (easily shown during the drain period of the peritoneal fluid). The gastro-intestinal symptoms might gradually progress to severe abdominal pain, anorexia, malnutrition, weight loss and the development of an abdominal mass with sub-occlusive periods. Peritoneal functions often show decreased net ultrafiltration and fast small solute transport status [42]

Radiological findings: The diagnosis of EPS can be confirmed by various imaging studies. Abdominal ultrasound might reveal a thick-walled mass containing bowel loops, loculated ascites and some fibrous adhesions. Plain abdominal radiography might show gas, some fluid levels, and dilatation of the bowel lumen indicating obstruction. In some patients calcifications are visible. At present CT-scan is the best-studied imaging technique when combined with a bowel opacification showing peritoneal enhancement, thickening and calcifications, adhesions of the bowel loops, signs of obstruction, fluid loculation, and ascites. MRI might revealed dilatation of the intestines, focal thickening of the bowel wall, massive ascites and compression of the bowel.

A classification in four progressive stages has been proposed by Nakamoto [43], (Table 1):

• The pre-EPS stage.

• The inflammatory stage

• The progressive stage

• The fibrotic stage

Risk factors

EPS is probably a multifactorial disease and, therefore, several risk factors that might cause peritoneal changes should be considered in its development.

Uremia: As chronic renal failure could also induce signs of vasculopathy and thickening of the sub-mesothelial zone, even before the initiation of PD [21], we should not be surprised that factors other than those related to PD itself are associated with EPS development [44].

The composition of dialysis solutions: The majority of the PD solutions, essentially those used at the beginning of the PD era, were non bio-compatible: acid pH, or lactate buffer could not be involved in the EPS procedure, but in our team the role of acetate buffer, used at the beginning of the CAPD, in June 1978, might be involved in the EPS development [3]. All PD solutions contain glucose, which is a major cause of peritoneal membrane injury. Heat sterilization of the PD fluids leads also to the formation of glucose degradation products, which accelerate the formation of AGEs [45]. High cumulative glucose load was associated with increased sub-mesothelial fibrous tissue [46]. Moreover, patients who developed EPS had a higher cumulative glucose exposure than those who did not, despite a similar duration of PD treatment [47]. These observations led to the development of new bio-compatible PD fluids, essentially bicarbonate buffered solutions; in clinical studies, patients had reduced levels of markers associated with peritoneal damage, suggesting an improvement in preservation of the peritoneal membrane [48,49].

Various dialysis solutions that do not contain glucose and are based instead on, icodextrin and amino-acids have also been introduced [50, 51]. Some studies have described an association between used of icodextrin-based solutions and increased expression of local inflammatory markers [52], other data suggest that the use of these solutions preserves both peritoneal membrane function and mesothelial cell mass [53]. A case-control study showed no difference in prescriptions of icodextrin-based dialysis solutions between patients with and those without EPS [54].

Duration of PD: The duration of PD is the most important risk factor for both peritoneal alterations and development of EPS [14]. Surprisingly, however, most cases of EPS are diagnosed only after discontinuation of the PD treatment for kidney transplantation or transfer to HD: 69% of the cases in a Japanese study [10, 19]. Only one study shows that peritoneal lavage after the discontinuation of PD has a positive effect in preventing EPS [55].

Peritonitis: Peritonitis episodes have long been considered to be a risk factor for EPS development [8, 56, 57]. In particular peritonitis caused by pseudomonas sp, staphylococcus aureus, haemophilus, or fungal organisms has been implicated in EPS [58, 59]. A japanese prospective study showed that 25% of EPS cases were associated with bacterial peritonitis [60], as an another study showed no relationship between bacterial peritonitis and EPS [12]. Some observations indicate that the cause of peritonitis (but not the incidence) might be relevant to the development of EPS [61].

Young age of patients: Although observational studies (and our presentation case) consistently shows that patients with EPS are often young (median age ranging from 34.7 to 52 years), this finding is difficult to interpret as older patients are less likely to remain on PD for more than 4 years [61].

Ultrafiltration failure: Patients with EPS almost always have fast transport failure and ultrafiltration failure: this was first described by our team [29]. In one study, half of the patients on PD for > 2 years, who developed ultrafiltration failure and continued PD developed EPS [62].

Kidney transplantation and discontinuation of PD: In some studies, a high incidence of post-transplantation EPS has been reported [63]. Discontinuation of PD, especially for kidney transplantation, but also for any other reason could favors the development of inflammatory biomarkers related previously: various causes of this phenomenon have been proposed with the use of immunosuppressive drugs, and tacrolimus [64]. Nevertheless, whether post-transplantation EPS is caused by discontinuation of PD, or results from the transplantation process itself and the use of some immunosuppressive drugs, currently remains unclear.

Exposure to Chlorhexidine and Practolol: A strong association has been reported between the use of chlorhexidine, a chemical antiseptic used at the early stage of CAPD, to sterilize dialysis tubing connections and development of EPS [65,66]. In 1974, a study reported an association between the use of practolol and onset of EPS in three patients not on PD treatment [67].

Therapeutic strategies

An early diagnosis supports a medical approach as a real bowel obstruction is more in favor with a surgical approach.

Cessation of PD treatment: At a asymptomatic, or inflammatory phase of EPS (Table 1), cessation of PD and transfer to HD seems to be the best strategy. The maintenance of the peritoneal catheter with regular peritoneal lavage in order to evacuate fibrin, growth factors and cytokines was recommended [45,68].

Immunosuppressive therapy: The rationale for the use of immunosuppressive agents in the treatment of patients with early EPS is to damp down the inflammation that precedes the encapsulating phase. Successful treatment has been described with corticosteroids [6,69,70]. The recommended dosage is about 0.5 to 1 mg/kg/day during one month, preceded by 3 bolus of methylprednisolone; then the dosage is decreased for a one year treatment.

Some successful treatments were reported with azathioprine, mycophenolate mofetil, sirolimus [71-75], alone or in association with corticosteroids.

Tamoxifen: Tamoxifen is a non-steroidal anti-estrogenic drug that is effective in the treatment of several fibrotic diseases such as retroperitoneal fibrosis. Several small case-series described positive effects [76,77]. A large clinical trial in England could not confirm this effect, however, perhaps because only one third of the participants displayed clinical symptoms of severe EPS [14]. By contrast a retrospective analysis of data from the Dutch EPS study showed a decrease in mortality of patients with EPS after treatment with tamoxifen [78].

Parenteral nutrition: While nutritional support is crucial at all stages of EPS, it is of paramount importance during the late stages of EPS, when gastro-intestinal symptoms become permanent and malnutrition may set in. At this point enhancement of nutritional support using total parenteral nutrition is usually necessary [14], it was realized before surgery in our presentation case.

Angiotensin II inhibitors: Angiotensin II inhibitors may be important in the prevention and treatment of EPS, as angiotensin II has pro-inflammatory and pro-fibrotic effects that act through TGF-β. The anti-fibrotic properties of angiotensin inhibitors are shown in renal fibrosis. In patients on PD, ACE inhibitors seem to have a positive effect on peritoneal function [79], however a protective effect of ACE inhibitors has not been found on EPS [80].

Surgery: Accepted indications for surgery in EPS include persistent bowel obstruction, failing nutritional status. It is important that surgical intervention be sought prior to the appearance of malnutrition, which may increase postoperative morbidity and mortality [81]. Surgical procedure is always a very long procedure including Noble plication during which the small bowel walls are stitched together, to prevent the formation of postoperative adhesions, in combination with enterolysis, have yielded dramatic reduction in recurrent symptoms [82]. The intervention frees the bowel from the cocoon and thereby may restore bowel function.

Summary statements

Two recent papers summarize the actual status and recommendations for preventing PD patients of the development of this rare disease [83,84].

1. EPS is recognized as a potential and rare complication of long-term PD treatment, occurring in patients on PD for more than 5 years. Although the incidence of EPS then increases with further time on PD, the condition remains infrequent and the majority of long-term patients are not affected.

2. The decision about when to discuss EPS as a potential complication of long-term PD treatment should be undertaken at some point with the patient, not necessarily at the start of PD but more reasonably at the 3-4 year point of therapy.

3. Encapsulating peritoneal sclerosis is associated with considerable morbidity and mortality. It is therefore important to develop strategies to reduce the risk to an individual patient.

4. No single strategy to reduce the risk of development of EPS has been proven in clinical trial but there is some evidence to support the followings:

- minimizing dialysate glucose exposure, although it is important to ensure that fluid volume status is not compromised as a result.

- preventing acute PD-related peritonitis using interventions recommended by the ISPD peritonitis guidelines.

- use of neutral-pH solutions, low glucose degradation product dialysis solutions.

1. The more severe clinical features of EPS with bowel obstruction, poor nutritional status, and ascites may develop even if PD is discontinued (patient transferred to HD or transplanted)

2. There are no specific predictors for the development of EPS:

- although many patients have ultrafiltration failure and fast small solute transport status, this not true for all patients and this is a common finding in patients on long-term PD.

- there is no evidence that CT scanning has any value in predicting EPS.

- progressive loss of osmotic conductance to glucose may reflect the development of peritoneal interstitial fibrosis, and may help identifying patients at risk of EPS. However, this needs to be confirmed in prospective studies.

3. Although changes in peritoneal membrane function, loss of ultrafiltration and frequent peritonitis are poor predictors of EPS, they are factors suggesting that transfer to HD should be considered and discussed with the patient, if appropriate, to optimize dialysis delivery. Such patients should be monitored closely for possible development of EPS if changing dialysis modality to HD.

4. Older patients and those with numerous comorbidities have a limited life expectancy when starting dialysis. Few will therefore survive long enough on PD to be at risk of developing EPS. Such patients are unlikely to be candidates for kidney transplantation so their quality of life on dialysis is very important. In considering the risk of development of EPS with such patient, it is therefore important to consider realistically their life expectancy, the feasibility of HD for that patient, and how this would affect their quality of life. Discussions with the patient should be part of a shared decision-making process about overall prognosis and goals of care.

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© 2017 Rottembourg J, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

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