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Erschienen in: World Journal of Emergency Surgery 1/2010

Open Access 01.12.2010 | Case report

Duodenal obstruction - an unusual presentation of Strongyloides stercoralis enteritis: a case report

verfasst von: Ruy J Cruz Jr, Rodrigo Vincenzi, Bernardo M Ketzer

Erschienen in: World Journal of Emergency Surgery | Ausgabe 1/2010

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Abstract

Background

Intestinal obstruction is a poorly recognized and probably underreported complication of strongyloidiasis. We present herein an unusual case, of complete duodenal obstruction caused by S. stercoralis.

Methods

A systematic review of the literature examining the clinical course, diagnostic methods, and outcome of this rare complication of strongyloidiasis was performed.

Results

A 42-year-old woman presented with a 5-month history of abdominal pain, vomit, and weight loss. An abdominal CT scan showed an obstruction of the third part of the duodenum. Segmental intestinal resection was carried out and histopathology examination revealed heavy Strongyloides stercoralis infestation. Duodenal obstruction is a rare complication of S. stercoralis infection, with only 8 cases described in the literature since 1970. Most of the patients are males, middle-aged, and the diagnosis was made by duodenal aspirate/biopsy, or analysis of surgical specimen.

Conclusions

Duodenal obstruction is an unusual, but potential fatal, complication of S. stercoralis infection. The large spectrum of clinical manifestation and lack of classic clinical syndrome make the final diagnosis of strongyloidiasis extremely difficult. A high index of suspicion, mainly in patients from endemic areas, is needed for correct and early diagnosis of this uncommon presentation of Strogyloides stercoralis enteritis.
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1749-7922-5-23) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors' contributions

All the authors participated in the admission and the care of this patient, the conception, manuscript preparation and literature search. In addition, all authors read and approved the final manuscript.

Background

Strongyloidiasis is a parasitic disease, caused by a nematode helminth, Strongyloides stercoralis. The true prevalence of S. stercoralis is likely underestimated because infection is often subclinical [13]. Currently, an estimated 100 million people are infected worldwide in more than 70 countries. Strongyloidiasis is endemic in Southeast Asia, Latin America, Sub-Saharan Africa, and parts of the southeastern United States [36]. Typically, the infection is asymptomatic or manifest as vague and unspecific gastrointestinal symptoms. However, disseminated infestation of infective larvae is associated with high mortality rates in immunocompromised patients [3, 7].
Intestinal obstruction is a poorly recognized and probably underreported complication of strongyloidiasis. Herein, we report an unusual case, of complete duodenal obstruction caused by S. stercoralis. Additionally, we performed a systematic review of the literature examining the clinical course, diagnostic methods, management and outcome of this rare, but potential fatal complication of S. stercoralis infection.

Methods

A review of literature was performed using the MEDLINE database in order to identify articles of duodenal obstruction caused by Strongyloides stercolaris. Inclusion was limited to cases reported in adults, and published in the English language since 1970. All the articles were systematically reviewed and only cases of confirmed duodenal obstruction were included in this report.

Case presentation

A 42-year-old woman presented with a 5-month history of recurrent abdominal pain, nausea, post-prandial vomiting, intermittent diarrhea, and a 20 Kg (44 lb) weight loss. Her past medical history was unremarkable, except for an admission for pneumonia in the past year. On physical examination the patient was in poor clinical condition, malnourished, afebrile, with a blood pressure of 100/40 mmHg, pulse of 100 beats per minute and a respiratory rate of 24 breaths per minute. No lymphadenophaty was found. The lungs were clear and the heart was normal on auscultation. Abdominal examination revealed epigastric distention, without guarding or rebound tenderness. The spleen and liver were not palpated and a mild pedal edema was observed.
Stools tested for occult blood were positive, and negative for ova and parasites. Laboratory evaluation revealed a hematocrit of 39%, white blood cell count of 14.9 × 103/L (bands 8%, neutrophils 73%, lynphocytes 12%, and eosinophils 0%), and platelet count of 600 × 103/μL. Total serum protein and albumin levels were 2.9 g/dL and 1.2 g/dL, respectively. Serum creatinine was 2.5 mg/dL, BUN 118 mg/dL, and potassium 2.8 mMol/L. Liver function tests, amylase and lipase were within normal limits. She had a positive serology for toxoplasmosis (IgM antibody), but negative for HIV, and HTLV-1.
A central line was established and fluid replacement was started. Broad-spectrum antibiotics were initiated for a possible intraabdominal infection/sepsis. An abdominal computed tomographic scan showed a marked gastric and duodenal distension, with a possible point of obstruction of the third part of the duodenum (Figure 1A). A nasogastric tube was placed for gastric decompression. Upper endoscopy was nondiagnostic due to a marked retention of alimentary residue in the stomach.
At this point we decided to start the patient on total parenteral nutrition and repeat the upper endoscopy in 48 hours. Despite clinical support, 24 hours after admission, the patient presented a significant worsening of the abdominal pain, fever, increasing white blood cell count, and intermittent hypotension requiring additional intravenous fluid bolus. Based on the abdominal CT findings, we suspected of the presence of a complicated submucosal duodenal tumor, such as a primary intestinal lymphoma or gastrointestinal stromal tumor, and decided to take the patient to the operating room.
She underwent an exploratory laparotomy that showed diffuse thickening and edema of the proximal small bowel, and a severe stenosis of the third part of the duodenum. Resection of the narrowed segment was carried out and an end-to-end duodenojejunostomy was performed. The resected specimen showed a severe inflammatory process, associated with mucosal ulceration and hemorrhage (Figure 1B). Histopathology examination revealed severe inflammation of the intestinal wall with heavy infestation of Strongyloides stercoralis (Figures 2A, and 2B). The patient was sent to the intensive care, antibiotics were continued, and treatment for disseminated strongyloidiasis with a combination therapy of ivermectin at a dose of 200 mcg/kg daily and albendazole 400 mg twice a day was started. Despite adequate clinical support, the patient died of septic shock seven days after exploratory laparotomy.

Discussion

Strongyloidiasis is a common intestinal infection caused by two species of the nematode Strongyloides. The most common and clinically important pathogenic species in humans is Strongyloides stercoralis. The other specie, Strongyloides fuelleborni, is found sporadically in Africa and may produce limited infections in humans [3, 8]. Strongyloidiasis was first described in 1876, in French colonial troops suffering from diarrhea in Vietnam [9].
The complete elucidation of the parasite's life cycle occurred 50 years after its identification. This fact is probably related to the unique and complex life cycle of the parasite. Strongyloides stercoralis larvae exist in two forms: free-living rhabditiform and filariform infective larvae. The cycle starts with the infectious filariform larvae penetrating the skin and traveling via lymphatics or bloodstream to the lungs. After penetrating in the alveoli the larvae continue to migrate up to the airways until they are swallowed. In the duodenum and proximal jejunum the larvae mature into adult females which live threaded in the intestinal mucosa. The larvae can produce up to 40 eggs a day by mitotic parthenogenesis (i.e., asexual reproduction where development of embryos occurs without fertilization by a male). Once these eggs hatch, rhabditiform larvae are released. These larvae can either passed in the stools, continuing the soil based cycle, or can cause autoinfection. The autoinfection occurs when the rhabditiform larvae prematurely become the infective filariform larvae in the intestinal lumen, and penetrate in the intestinal mucosa or perianal skin (internal and external autoinfection, respectively). In either case the infective larvae migrate to the lungs and restart the cycle previously described [1, 3, 7]. The autoinfection phenomenon allows S. stercoralis to persist and replicate within a host for decades, with the longest reported period being 65 years [10].
The term "disseminated disease" is used to define when the infective larvae migrate, from the intestine, in massive numbers not only to the lungs but to other organs not involved in the normal helminthic life cycle. In disseminated strongyloidiasis, the mortality rate can be as high as 70-90% [3]. Several risk factors are associated with the development of disseminated strongyloidiasis, including (1) immune deficiency, (2) hematologic malignacy, (3) steroids administration, (4) HTLV-1 infection, (5) chronic alcoholism, (6) renal failure, (7) transplantation, among others [11]. In disseminated disease, translocation of enteric bacteria may occur, leading to Gram-negative sepsis and/or meningitis. The enteric microorganism can either enter the circulation through intestinal ulcers or be carried by the infective filariform larvae.
Approximately, half of Strongyloides infections are asymptomatic [1, 3]. Clinical presentation is extremely variable reflecting the complex life cycle of the parasite. When symptoms develop, gastrointestinal complaints are common. Symptoms are vague and nonspecific and include anorexia, nausea, vomiting, weight loss, abdominal pain, flatulence, and diarrhea. Less frequently, malabsorption syndromes, paralytic ileus, intestinal obstruction and gastrointestinal bleeding, may occur [13]. Pulmonary symptoms are rare in uncomplicated strongyloidiasis, but cough and wheezing may be part of initial presentation (Löffler's syndrome). In disseminated disease respiratory symptoms become more prominent and include dyspnea, tachypnea, pleuritic pain, pleural effusion, and hemoptysis [1, 2, 6]. Larva currens (racing larvae) is the pathognomonic cutaneus manifestation of Strongyloidis infection that usually occurs during an external autoinfection episode. The serpiginous urticarial rash is caused by rapid (approximatelly 15 cm/h) moving of Strongyloides stercoralis larvae from the anal area down the upper thighs [3, 12].
Duodenal obstruction is an extremely rare complication of strongyloidiasis, with eight cases reported in the medical literature. Table 1 summarizes all the reported cases of duodenal obstruction caused by Strongyloides stercolaris since 1970 [9, 1318]. Two mechanisms have been implicated in the duodenal obstruction due to S. stercoralis. First, the obstruction would be related to a severe mucosal edema and inflammation with significant narrowing of duodenal lumen. Second, an extrinsic compression of the duodenum by the superior mesenteric neurovascular bundle could be responsible for the obstructive symptoms. Several mechanisms are proposed to explicate the extrinsic duodenal compression (i.e. superior mesenteric artery/Wilkie's Syndrome) in patients with strongyloidiasis, including severe weight loss, duodenal distention, mesenteric lymphatic dilation, and increase in the diameter of superior mesenteric vessels [15, 16, 19].
Table 1
Literature review of duodenal obstruction caused by Strongyloides stercoralis infection (1970-2010).
Author
Year
Age
Gender
Country
Associated disease
WBC/eosinophils
Surgery
Diagnosis
Treatment
Outcome
Cohen & Spry13
1979
40
M
England
lymphoma
16.500/4%
SB resection
DA, EGD+bx
thiabendazole *
Dead
Zyngier et al.14
1983
30
M
Brazil
no
NR/0%
gastrojejunostomy
GA, sputum
thiabendazole †
Alive
Lee & Terry15
1989
15
M
Jamaica
no
4.400/NR
no
stool analysis
thiabendazole ‡
Alive
 
1989
19
F
Jamaica
no
10.000/NR
no
DA
thiabendazole
Alive
Friedenberg et al.16
1999
40
M
USA
HTLV-1 infection
35.500/1%
no
EGD+bx
thiabendazole
Dead
Harish et al.9
2005
45
M
India
no
12.000/14%
no
DA, EGD+bx
ivermectin
Alive
Suvarna et al.17
2005
70
M
India
no
11.000/(220/μL)
no
EGD+bx
ivermectin #
Alive
Juchems et al.18
2008
63
M
Germany
no
10.500/NR
partial gastrectomy
surgical specimen
ivermectin
Alive
Current case
2010
42
F
Brazil
no
14.900/0%
duodenal resection
surgical specimen
ivermectin + albendazole
Dead
NR, not reported; WBC, white blood cell count; DA, duodenal aspirate; GA, gastric aspirate; EGD, esophagogastroduodenoscopy; SB small bowel; bx, biopsy; HTLV-1, Human T-lymphotropic virus Type I
* small bowel resection after medical treatment for strongyloidiasis showed poorly differentiate small bowel lymphoma
† patient underwent to a gastrojejunostomy; diagnosis was made after surgery by EGD + gastric aspirate
‡ patient presented new episode of duodenal obstruction 6 years after the initial treatment/recurrent strongyloidiasis
# initially treated with albendazole without success.
Paralytic ileus is also a potential complication of S. stercolaris hyperinfection [7, 11, 2023]. In a recent review, Yoshida et al. have reported 25 cases of Strongyloides-related ileus [11]. Most of the patients were males (60%) and middle-aged, findings similar to patients with duodenal obstruction (Table 1). Despite unavailable data in the literature, it seems that obstructive gastrointestinal symptoms are more common in this specific group of patients, since the infection has no predilection for either sex or age.
Strongyloidiasis is usually associated with anemia, hypocholesterolemia and hypoalbuminemia. Eosinophilia is an inconsistent finding, present in up to 35% during the acute phase, and less frequent in patients with chronic or disseminated disease. Most patients with duodenal obstruction presented low eosinophil count indicating a chronic infection. Eosinopenia and low IgE level have been associated with a poor prognosis, in patients with disseminated disease [3, 11].
Duodenal obstruction may be caused by different diseases, including tuberculosis, primary intestinal lymphoma, Crohn's disease, eosinophilic gastroenteritis and gastrointestinal stromal tumor. Despite extensive preoperative work-up, three out of the nine cases presented in Table 1, the diagnosis was made after exploratory laparotomy. Therefore, a high index of suspicion is essential for correct diagnosis of Strongyloides-related duodenal obstruction. The diagnosis of strongyloidiasis may be confirmed by the presence of the larvae in the stools. This is an easy performed, broadly available and inexpensive method for detection of the parasite. However, stool examination is relatively insensitive, and diagnostic yield of a single specimen is approximately 30%. The sensitivity of fecal smear could be increased to up to 60%, if five or more stool samples are examined [24]. Of note, S. stercoralis is the only helminth that secretes larvae in the stools. Thus, the presence of eggs in the fecal smear is unlikely.
Other methods such as duodenal aspirate or biopsy are more invasive therefore less desirable. Nevertheless, it has been shown that the examination of a duodenal aspirate for ova and larvae is the most sensitive diagnostic procedure, with a false-negative frequency of less than 10% [24, 25]. Endoscopic findings include duodenal mucosal edema, erythema, hemorrhagic spots, ulcerations, and in some cases megaduodenum. Duodenal white villi is also a common endoscopic feature, and should alert the physician for the diagnosis of strongyloidiasis [25, 26]. Recently, Kishimoto et al. showed that the S. stercoralis larvae identification in duodenal biopsies is feasible in 71% of cases [27]. In eight out of the nine cases presented in Table 1, the diagnosis was made by duodenal aspirate/biopsy, or analysis of surgical specimen. These findings confirmed the poor reliability of stool analysis for the parasite identification
In cases of disseminated infection, the parasite can be also identified in sputum, broncho-alveolar lavage, cerebrospinal fluid, skin, urine, and ascites [7]. Serology tests are indicated when the infection is suspected and the S. stercoralis cannot be demonstrated by the standard diagnostic evaluation. Although, indirect hemmagglutination (IHA) and indirect fluorescent antibody (IFA) test have been used, enzyme-linked immunosorbent assay (ELISA) is currently recommended because of its greater sensitivity [8, 28, 29]. Despite its high specificity and sensitivity, immunodiagnostic tests have certain limitations, including: (1) variable reliability in different commercial kits available, (2) falsely negative results in immunocompromised hosts, (3) the presence of anti-strongyloides antibody for a long period of time, even after successful treatment, and (4) falsely positive results due to cross-reactions with other parasitic infections such as filariasis and acute schistosomiasis [3, 8].
Imaging studies are nonspecific. However, radiological abnormalities restricted to the duodenum and proximal jejunum, on CT scans and upper gastrointestinal series, should alert the surgeon to the possibility of strongyloidiasis. A unique radiographic feature of strongyloidiasis is the reflux of oral contrast into the biliary tree, possibly due to an incompetent sphincter of Oddi caused by severe inflammation of the duodenal wall [30].
Medical treatment should be achieved even in the absence of symptoms, in order to avoid the dissemination of the parasite and minimize the risk of development hyperinfection syndrome. The drug of choice for treatment of strongyloidiasis is ivermectin given at a dose of 200 mcg/kg of body weight daily for at least 2 days [3, 8, 31]. In cases of disseminated disease it may be necessary to prolong or repeat therapy. Albendazole and thiabendazole, are equivalent to ivermectin in efficacy. However, thiabendazole is associated with frequent and severe side effects, and has not been longer recommended for systemic infection in HIV-patients [7]. Due to a critical condition of our patient we decided to use a combination therapy of albendazole and ivermectin. This therapeutic strategy has been recommended for the treatment of disseminated strongyloidiasis with good results [3, 8, 25].
In patients who are not able to tolerate oral treatment, rectal administration of ivermectin or thiabendazole has been suggested [32, 33]. However, recent reports have shown that serum ivermectin concentration is very low after rectal administration in patients sustaining paralytic ileus or intestinal obstruction [34, 35]. No parenteral preparation of these anthelmintics is available for use in humans, although subcutaneous veterinary ivermectin has been utilized successfully in the treatment of strongyloidiasis unresponsive to standard oral therapy or when enteral administration is not feasible [3436]. Thus, further studies assessing safety, efficacy and pharmacokinetics of parenteral ivermectin are needed in order improve the treatment and outcome of patients sustaining this unusual complication of Strongyloides stercoralis hyperinfection.

Conclusion

In summary, duodenal obstruction is a rare, but potential fatal, complication of S. stercoralis infection. The large spectrum of clinical manifestation and lack of classic clinical syndrome make the final diagnosis of strongyloidiasis extremely difficult. Therefore a high index of suspicion, mainly in patients from endemic areas, is needed for correct and early diagnosis of this uncommon complication of Strogyloides stercoralis infection.
Written informed consent was obtained from the patient's family for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​2.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Competing interests

The authors declare that they have no competing interests.

Authors' contributions

All the authors participated in the admission and the care of this patient, the conception, manuscript preparation and literature search. In addition, all authors read and approved the final manuscript.
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Authors’ original submitted files for images

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Metadaten
Titel
Duodenal obstruction - an unusual presentation of Strongyloides stercoralis enteritis: a case report
verfasst von
Ruy J Cruz Jr
Rodrigo Vincenzi
Bernardo M Ketzer
Publikationsdatum
01.12.2010
Verlag
BioMed Central
Erschienen in
World Journal of Emergency Surgery / Ausgabe 1/2010
Elektronische ISSN: 1749-7922
DOI
https://doi.org/10.1186/1749-7922-5-23

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