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 Table of Contents  
CASE REPORT
Year : 2015  |  Volume : 2  |  Issue : 3  |  Page : 107-111

Anicteric leptospirosis: An unusual cause of acute pancreatitis


1 Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, Uttar Pradesh, India
2 Department of Microbiology, Jawaharlal Nehru Medical College, Aligarh, Uttar Pradesh, India

Date of Web Publication24-Sep-2015

Correspondence Address:
Ruhi Khan
Assistant Professor, Department of Medicine, Jawaharlal Nehru Medical College, Aligarh, Uttar Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2225-6482.166085

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  Abstract 

Leptospirosis is one of the most common zoonotic diseases that are potentially fatal but it is quite under-diagnosed and under-reported. However, acute necrotizing pancreatitis, which is usually associated with high mortality rate, is a rare complication of leptospirosis. This is a report of leptospirosis case presenting with acute pancreatitis. A previously healthy 35-year-old male Indian farmer presented to the emergency department with chief complaints of high-grade fever, chills, and rigors but no rash for the last 3 days. There was no history of a cough, breathlessness, pain abdomen, vomiting, hemoptysis or hematemesis, altered sensorium, or burning micturition. There was no history of any addiction or previous hospitalization. Respiratory, cardiovascular and neurological system examination was normal. Leptospira IgM ELISA was undertaken on the 7 th day of admission, which was found to be positive. IgG negative and a Leptospira microagglutination test was also positive (at 1/200, Leptospira icterohemorrhagica) pyogenes. Severe leptospirosis may be fatal before IgM antibody is reliably produced; furthermore, leptospiremia may be difficult to detect due to negative serologic results and blood cultures. Therefore, repeat serology after the 1 st week of illness and empirical treatment prior to serologic results may be essential for improving outcome in patients with severe leptospirosis.

Keywords: Anicteric, leptospirosis, necrosis, pancreatitis, renal failure, thrombocytopenia


How to cite this article:
Khan R, Quaiser S, Khan F. Anicteric leptospirosis: An unusual cause of acute pancreatitis. Community Acquir Infect 2015;2:107-11

How to cite this URL:
Khan R, Quaiser S, Khan F. Anicteric leptospirosis: An unusual cause of acute pancreatitis. Community Acquir Infect [serial online] 2015 [cited 2020 Sep 18];2:107-11. Available from: http://www.caijournal.com/text.asp?2015/2/3/107/166085


  Introduction Top


Leptospirosis was first mentioned in 1812 by Larrey and is commonly known as the "yellow fever." It is the most frequent zoonosis in the world caused by the pathogenic spirochetes from Leptospira family [1] and is characterized by a broad spectrum of clinical manifestation varying from inapparent infection to fulminant fatal disease. [2]

It affects both humans and animals especially, rodents. This disease is seen frequently in certain occupational groups such as veterinarians, agriculture workers, slaughterhouse employees, and sewage workers. Leptospirosis mainly affects liver and kidney. Rarely, other organs such as lung, heart, gallbladder, brain, and ophthalmic tissues are involved, mainly due to vasculitis. [3],[4]

Association of necrotizing pancreatitis with leptospirosis has been rarely reported. [5],[6],[7]


  Case report Top


A previously healthy 35-year-old male, a farmer by occupation, presented to the emergency department with chief complaints of high-grade fever with chills and rigors but no rash for the last 3 days. There was no history of a cough, breathlessness, pain abdomen, vomiting, hemoptysis or hematemesis, altered sensorium, or burning micturition. There was no history of any addiction or previous hospitalization. On examination, he was conscious, oriented, febrile with temperature of 101.6°F, blood pressure of 124/76 mm Hg, pulse rate of 100/min low in volume, regular, respiratory rate 18/min with no pallor, icterus, cyanosis, or clubbing. Respiratory, cardiovascular and neurological system examination was normal. Arterial blood gas analysis was also normal. The investigations revealed hemoglobin 10.8 g/dL (reference range: 12-16 g/dL), total leukocyte count 14,600/mm 3 (reference range: 4000-11,000/mm 3 ), detailed leukocyte count: Neutrophils 74% (reference range: 40-56%), lymphocytes 20% (reference range: 20-40%) and eosinophils 1% (reference range: 0-5%), and platelet count 78,000/mm 3 (reference range: 150,000-450,000/mm 3 ). Blood urea was 48 mg/dL (reference range: 14-50 mg/dL), serum creatinine 1.4 mg/dL (reference range: 0.5-1.4 mg/dL), serum Na + 140 mEq/L (reference range: 135-145 mEq/L), K + 4.6 mEq/L (reference range: 3.5-5.0 mEq/L), serum Ca 2+ 8.2 mg/dL (reference range: 8.5-10.2 mg/dL), and blood glucose was 83 mg/dL (reference range: 70-110 mg/dL). Serum bilirubin was 1.9 mg/dL (reference range: 0.3-1.3 mg/dL) with direct 1.2 mg/dL (reference range: 0.1-0.4 mg/dL), transaminases were serum glutamic pyruvic transaminase 46 U/L and serum glutamic oxalacetic transaminase 50 U/L (reference range: 8-40 U/L and 10-38 U/L, respectively), alkaline phosphatase was 133U/L (reference range: 13-100 U/L), serum triglyceride 124 mg/dL (reference range: 70-140 mg/dL), and serum albumin was 2.8 g/dL (reference range: 3.5-5.5 g/dL). Malarial parasite quantitative buffy coat test for Plasmodium vivax malaria, histidine-rich, protein-based immunochromatographic card test for Plasmodium falciparum malaria, as well as peripheral blood smear examination were negative. Typhidot was negative for  Salmonella More Details typhi. Serological tests for the herpes simplex virus, dengue and NS1 antigen assay, hepatitis A, B, E, and the human immunodeficiency virus were also negative. Chest X-ray and electrocardiography were normal. In view of the persistently thrombocytopenia, Leptospira IgM ELISA was undertaken on the 2 nd day of admission which was found to be negative (5 Panbio units). IgG negative and a Leptospira microagglutination test (MAT) was negative (at 1/20, Leptospira icterohemorrhagiae).

Microscopic agglutination test

Microscopic agglutination test (MAT) was performed with a panel of 20 serovars as shown in [Table 1]. Two-fold serial dilutions of serum sample were made with 0.01 M phosphate-buffered saline (pH 7.2) starting from 1:25. The diluted serum samples were incubated with an equal volume of live cultures for 2 h at room temperature with suspensions of live leptospires. As per standard protocol, the endpoint was determined as the highest dilution of serum showing 50% reduction in the number of free moving leptospires. [8]
Table 1: List of serovars used for microscopic agglutination test

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The cutoff titer was considered as 1:100, with 50% reduction in free moving leptospires as established earlier. [9] Improving outcome in patients with severe leptospirosis.

Leptospira IgM ELISA

Detection of IgM antibodies to Leptospira species was determined using a commercially available Leptospira IgM ELISA (Panbio Pty., Ltd., Queensland, Australia). The assay was performed according to the manufacturer's instructions. Briefly, test sera, cutoff calibrator, and positive and negative control sera were diluted 1:100 in serum diluent, and 100 μL added to Leptospira antigen-coated microwells and incubated for 30 min at 37°C. After washing with phosphate-buffered saline containing 0.05% Tween 20, 100 μL of horseradish peroxidase conjugated anti-human IgM was added and incubated for another 30 min at 37°C. After further washing, 100 μL of tetramethylbenzidine substrate was added and incubated at room temperature for 10 min, after which the reaction was stopped with 100 μL of 1 M phosphoric acid. The absorbance of each well was read at a wavelength of 450 nm with a Bio-Tek ELX 808 plate reader (Bio-Tek Instruments, Winooski, VT). The results were expressed as Panbio units calculated by the ratio of sample absorbance to the mean cutoff absorbance multiplied by 10. The recommended cutoff for a positive result is a value of ≥11 Panbio units and is interpreted by the manufacturer to indicate a recent infection of leptospirosis. The sensitivity and specificity of IgM ELISA on paired sera were reported to be ranging from 90.8% to 100% and 55.1-98%. [10],[11]

The patient was started on injection ceftriaxone 1 g 12 hourly, antipyretics and intravenous fluids. On 3 rd day of hospital stay, he complained acute onset pain in abdomen localized to epigastrium and umbilical region and decrease in urine output was noticed (700 mL/24 h) with a systolic blood pressure of 82 mm Hg. On examination, the abdomen was soft, but tenderness was present in the epigastrium. Bowels sounds were 4-5/min, no free fluid or organomegaly was noted. Inotropic support was started, and an erect X-ray abdomen was done which was normal. The serum amylase was 1040 U/L (reference range: 10-200 U/L) and serum lipase was 302 U/L (reference range: 10-80 U/L), platelet count 74,000/mm 3 (reference range: 150,000-450,000/mm 3 ), blood urea was 54 mg/dL (reference range: 14-50 mg/dL), and serum creatinine 1.5 mg/dL which rose to 5.6 mg/dL on day 4 of admission (reference range: 0.5-1.4 mg/dL) along with persistent oliguria. Ultrasonography of abdomen revealed a bulky pancreas, no gallstones, ascites, or splenomegaly was seen. A contrast-enhanced computed tomography (CT) scan of the abdomen was done which was suggestive of diffuse pancreatitis with modified CT severity index of 6 as shown in [Figure 1].
Figure 1: Contrast-enhanced computed tomography axial section reveals nonenhancing pancreatic parenchyma (black arrow) in the region of the head as well as the tail of pancreas suggestive of necrosis. Concomitant peripancreatic inflammatory changes co-exist (white arrow)

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In view of the persistently thrombocytopenia, Leptospira IgM ELISA was undertaken on the 7 th day of admission which was found to be positive. IgG negative and a Leptospira MAT was positive (at 1/200, L. icterohemorrhagiae pyogenes).

A diagnosis of Leptospira associated acute pancreatitis was made.

The patient was managed conservatively with intravenous fluids, analgesics, and imipenem-cilastin 500 mg thrice daily which was continued for 10 days along with supportive therapy. Inotropic support was gradually tapered off after 36 h. Sustained low-efficiency dialysis (SLED) was initiated on day 4 of admission with a blood flow rate of 100 mL/min and 5 sessions of SLED were given subsequently. Nasojejunal feeding tube was inserted under endoscopic guidance for adequate caloric intake. Five days after the treatment, body temperature decreased to 99.6°C, amylase levels decreased to normal value 142 U/L and platelet count increased to 160,000/mm 3 . Bilirubin levels, liver function tests, and creatinine level slowly returned to normal within 11 days of hospital stay. Patient recovered completely and was discharged on 15 th day of admission in a stable condition (laboratory tests at the discharge time revealed white blood cell: 7600/mm 3 , Hb: 11 g/L, total bilirubin: 0.9 mg/dL, blood urea: 38 mg/dL, Cr: 1.2 mg/dL, aspartate transaminase: 25 U/L, alanine transaminase: 46 U/L, and lactate dehydrogenase: 366 U/L).


  Discussion Top


This disease occurs as two clinically recognizable syndromes: The anicteric leptospirosis (80-90% of all cases) and the remainder icteric leptospirosis. [3],[4]

Icteric leptospirosis is known as Weil's disease, which is characterized by hemorrhage, renal failure, and jaundice. Icteric leptospirosis is a much more severe disease than anicteric form. The clinical course is often rapidly progressing. The source of infection in humans is usually either direct or indirect contact with the urine of infected animals. These bacteria infect humans by entering through abraded skin, mucous membrane, and conjunctivae. Direct transmission between humans is rare. [3],[4] Leptospirosis is a common disease in rice field workers due to the prevalence of wild rats. [4] Rice field with stagnant water and the humid condition is an ideal environment for Leptospira. Our patient was also a farmer by occupation.

The incubation period is usually 1-2 weeks. Laboratory findings reveal thrombocytopenia as a common finding occurring in 40-85% of cases. Erythrocyte sedimentation rate and leukocyte are also elevated.

Pathogenesis of organ dysfunction is yet to be fully understood. It is thought to be related to Leptospira burden, associated cytotoxic factors in the tissue especially in liver and kidney and host immune mechanism, especially in lungs. [12],[13],[14] An immunological basis for the pathogenesis of leptospirosis including toll-like receptor (TLR) 2 activation is described recently. [13] TLR 2 plays a major role in the development of pulmonary and renal manifestations of leptospirosis. [15] Leptospira lipoprotein LipL32 triggers an inflammatory response in renal proximal tubule cells by activation of TLR 2 and hence nuclear factor-kappa B and mitogen-activated protein kinases. [13],[15] Though it is not yet described in relation to leptospirosis, TLR may contribute to myocarditis in sepsis, and may involve in the pathogenesis of acute pancreatitis. [16],[17] Bacterial peptidoglycan-associated lipoprotein uses the TLR 2 signaling pathway to induce cardiomyocyte dysfunction and inflammatory response in mice. [16] In acute pancreatitis, increased expression, and activation of TLR 2/4 has been recognized, and their role in multi-organ involvement was identified. [17] Thus a similar mechanism involving TLR may explain the presentation of our patient.

A rapid, accurate method for the diagnosis of leptospirosis is important in order to start appropriate treatment. Although leptospirosis is one of the common causes of acute febrile illness with multi-organ failure in developing countries, it remains under-diagnosed mainly because of protean manifestations and lack of proper diagnostic technique. [18] MAT is considered as the gold standard for serodiagnosis of leptospirosis which was also positive in our patient, [12] but in previous studies its sensitivity was found to vary from 30% to 76%, with a specificity of 97%. [19] But in combination, the sensitivity of IgM ELISA and MAT was found to increase to 70% as reported earlier by Shekatkar et al. [20] Several recombinant proteins (rLipL32, rLipL41) have been identified to be specific to pathogenic leptospires, but with varied sensitivity and specificity in serodiagnosis. One such recombinant protein LipL32 IgG ELISA, the sensitivity and specificity was 96.2% and 90%, respectively, which was comparable with Pan Bio IgM ELISA. [21] Senthilkumar et al. have used rLipL 41, the sensitivity and specificity was found to be 89.7% and 90.45% with reference to MAT. [22]

Several IgM-based, commercial kits are available for the diagnosis of systemic leptospirosis using broadly reactive leptospiral antigen. [18] Winslow et al., 1997 have reported Panbio kit to be highly sensitive for diagnosis of systemic leptospirosis, the sensitivity and specificity was 100% and 98%. [11] But recently, Desakorn et al. [10] using the cutoff value recommended by the manufacturer (11 Panbio units), sensitivity and specificity of IgM ELISA on paired sera was reported to be 90.8% and 55.1%. A receiver operating characteristic curve was used to determine the optimal cutoff value. This was 20 Panbio units, which gave a sensitivity and specificity of 76.1% and 82.6%, respectively, on paired sera.

The diagnosis of pancreatitis was based on biochemical and radiological evidence [Figure 1]. Increased serum lipase more than 3 times the upper normal value is highly specific for pancreatitis in this patient especially at a time of normal renal functions. [23],[24] The other endemic pathogens which lead to multisystem involvement such as dengue hemorrhagic fever, hepatitis virus, and malaria were excluded.

Though the reported incidence of pancreatitis in leptospirosis is infrequent, in reality pancreatic involvement may be more common. Under-recognition could be due to several reasons. Pancreatic involvement could be subclinical or clinically unrecognized when dramatic and rapidly dynamic alterations of clinical and biochemical parameters take place in multi-organ dysfunction in leptospirosis. Thus, a clinician may find it difficult to identify each and every complication such as pancreatitis, acalculous cholecystitis, cerebral venous thrombosis, and myositis. [25],[26]

Additionally in a clinical setup, when a patient presents with acute pancreatitis alone as in this case, leptospirosis might not be considered as an etiology in the initial workup because of the rarity. Later the patient may develop multi-organ failure due to leptospirosis, yet that might be attributed to the multi-organ involvement of acute pancreatitis. Ultimately, recognition of leptospirosis might get delayed compromising the optimum management.

In disease-endemic areas, acute pancreatitis should be suspected even in anicteric leptospirosis patients with appropriate epidemiologic and clinical findings and abdominal pain; conversely, leptospirosis should be considered as a possible cause of pancreatitis. It is important to note that in our patient, acute serologic results obtained on day 5 of symptoms (hospital day 2) were negative, and the diagnosis was only obtained upon repeat testing 5 days later.

Severe leptospirosis may be fatal before IgM antibody is reliably produced, and leptospiremia may be difficult to detect; negative serologic results and blood cultures (even placed into specific growth media) do not exclude the diagnosis. [4],[12] Repeat serology after the 1 st week of illness and empirical treatment prior to serologic results may be essential for improving outcome in patients with severe leptospirosis.

Hyperamylasemia can be present in leptospirosis infection due to renal impairment, [27],[28] so serum lipase should be preferred. So the diagnosis of Leptospira associated pancreatitis should be made on proper clinical, biochemical, and radiological findings.

In management, most of the patients of leptospirosis show spontaneous recovery and do not require any specific therapy. Although, the use of antibiotics is not well proven in leptospirosis, its early initiation can shorten the course of severity, and prevent the progression of the mild disease. [29] Penicillin, tetracycline, ceftriaxone, and doxycycline are the preferred antibiotics. A Cochrane Systematic Review failed to find sufficient evidence to provide clear guidelines for use of antibiotics. [30] Patients with severe leptospirosis require correction of hypovolemia, hypotension, and electrolyte abnormalities.


  Conclusion Top


This case illustrates diagnostic difficulties especially in low-resource settings with farming being one of the principal occupations in our country, where leptospirosis is more common. Although Weil's syndrome has been seen associated with the majority of the complications, our case highlights the fact that anicteric leptospirosis can be delirious too. A high-index of suspicion can be lifesaving in such cases who are often labeled as idiopathic pancreatitis or even antibiotic-induced gastritis, especially in low-resource settings.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
  References Top

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Bharti AR, Nally JE, Ricaldi JN, Matthias MA, Diaz MM, Lovett MA, et al. Leptospirosis: A zoonotic disease of global importance. Lancet Infect Dis 2003;3:757-71.  Back to cited text no. 12
    
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