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Gastroenterology & Hepatology: Open Access

Review Article Volume 7 Issue 1

Review Article: Mycoplasma Pneumoniae-Associated Acute Hepatitis

Shou Wu Lee,1,2 Teng Yu Lee,1,2 Sheng Shun Yang,1,3 Chun Fang Tung,1,2 Hong Zen Yeh,1,3 Chi Sen Chang1,2

1Department of Internal Medicine, Taichung Veterans General Hospital, Taiwan
2Department of Internal Medicine, Chung Shan Medical University, Taiwan
3Department of Internal Medicine, Yang-Ming University, Taiwan

Correspondence: Shou-Wu Lee, Division of Gastroenterology, Department of Internal Medicine, Taichung Veterans General Hospital, Taichung, Taiwan, No. 160, Sec. 3, Chung-Kang Rd., Taichung, 40705, Taiwan, Tel 886-4-2359-2525, Fax +886-4-23741331

Received: May 17, 2017 | Published: June 16, 2017

Citation: Lee SW, Lee TY, Yang SS, Tung CF, Yeh HZ et al. (2017) Review Article: Mycoplasma Pneumoniae -Associated Acute Hepatitis. Gastroenterol Hepatol Open Access 7(1): 00222. DOI: 10.15406/ghoa.2017.07.00222

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Abstract

Mycoplasma pneumoniae is a major cause of respiratory infections and a possible etiology of acute hepatitis. Acute hepatitis due to M. pneumoniae infection is often combined with presentation of pneumonia, even without lung involvement. The presentations and etiologies of M. pneumoniae-associated hepatitis with simultaneous, delayed, or without, lung involvement are different, and should be discussed separately. The most widely available and effective drug of treatment is macrolides, and its clinical outcome is extremely good.

Keywords: hepatitis, Mycoplasma pneumoniae

Introduction

Mycoplasma pneumoniae, one of the smallest organisms that can survive alone in nature, is a common cause of upper respiratory tract infections. The first mycoplasmas were discovered in 1898 by Nocard and Roux in animals with contagious bovine pleuropneumonia. In 1944, Eaton isolated a pathogenic Mycoplasma from a patient with atypical pneumonia. It was named M. pneumoniae by Chanock in 1962.1 M. pneumoniae is a short rod that is invisible on Gram staining due to lack of a cell wall,2 and it can grow under both aerobic and anaerobic conditions. It is a major cause of respiratory infections in school-aged children and young adults.3 Although the incidence of the disease does not vary greatly by season, outbreaks of M. pneumoniae infections tend to occur in the summer or early fall.4

M. pneumoniaeinfection is transmitted through aerosols from person to person, and persons with active mycoplasmal infection will carry the organism in the nose, throat, trachea and sputum. Most M. pneumoniaeinfections in adults involve the respiratory tract, and symptoms range from nonproductive cough to severe pneumonia.5 The severity of disease appears to be related to the degree to which the host immune response reacts to the infection.4

Extrapulmonary manifestations of M. pneumoniae infection may be found in the dermatologic, cardiovascular, neurologic, hematologic, musculoskeletal and gastrointestinal systems.6 Approximately 25% of patients hospitalized for treatment of M. pneumoniae can present extrapulmonary complications at some time during the disease course.7 Skin lesions include maculopapular rashes, erythema multiforme minor, and Stevens-Johnson syndrome. Cardiovascular involvement includes myocarditis, pericarditis and rheumatic fever-like syndrome. Neurologic complications include meningoencephalitis, aseptic meningitis, cerebellar ataxia and Guillain-Barre syndrome. Hematologic involvement includes hemolysis with positive Coombs’ test and reticulocytosis. Musculoskeletal presentations include nonspecific myalgia, arthralgias and polyarthropathies. Gastrointestinal manifestations include vomiting, abdominal pain, and albeit rare, pancreatitis and hepatitis.7,8 The immune-mediated damage by cross-reactive anti-M. pneumoniae antibodies is thought to be responsible for most of the extrapulmonary manifestations.9

Simultaneous M. pneumoniae-associated pneumonia and acute hepatitis

Elevated liver enzyme assays are frequently observed during M. pneumoniae infection. Squadrini et al.,10 reported that 50% of patients presenting with serologically-confirmed M. pneumoniae disease showed evidence of hepatic disorder.10 The most widely recognized manifestation of M. pneumoniae-related hepatitis is elevated alanine aminotransferase (ALT) level. The hepatic dysfunction was found to be transitory and recovery of normal liver function correlated directly with the resolution of the mycoplasma respiratory disease. Although rare, chronic active hepatitis has also been reported.11

The pathogenesis of self-limiting hepatitis may be attributed to several factors, including a direct cytolytic effect mediated by the infecting mycoplasma resulting in perinecrotic edema; immunological, autoimmune disorder resulting from the production of heterophil antibiotics; or the mitogenic properties of M. pneumoniae acting on lymphocytes, which plays a role in the development of complications involving target organs.6 Suzuyama et al.8 decumented that inflammatory signs such as higher body temperature, greater number of leukocytes, and elevated C-reactive protein (CRP) levels were more likely to appear in patients with abnormal liver function than those with normal liver function.8 Doxboeck et al.,12 noted that patients with M. pneumoniae-associated pneumonia and abnormal liver function had higher leukocyte and CRP levels than those with normal liver function.12 Shin et al.,13 found male gender, younger age, and higher CRP were associated with M. pneumoniae-related hepatitis.13 In summary, patients with simultaneous pneumonia and hepatitis due to M. pneumoniae infection have greater disease severity and more acute inflammatory reactions.

M. pneumoniae-associated acute hepatitis without pneumonia

Viral hepatitis accounts for most cases of acute hepatitis. Some bacterial infections are often associated with acute hepatitis, such as Salmonella, Rickettsia, Brucella or M. pneumonia.14 Hepatitis due to M. pneumoniae was first described in 1975.15 Selected cases of M. pneumoniae-associated acute hepatitis were retrieved from MEDLINE and are summarized in Table 1.9,14,16,17

Reference

Gender

Age(year)

Symptoms

Liver Function at Admission

Treatment

Outcomes

AST/ALT

ALP/BIL

Fever regress (day)

Liver function normalize (week)

Anti-IgM disappear (month)

Narita et al.,16

M

5

Fever, lymphadenopathy, polymorphous exanthema

2375/1488

ND/ND

IV clarithromycin

5

4

ND

Narita et al.,16

M

10

Fever, lymphadenopathy

129/240

ND/ND

Oral minocycline

ND

3

ND

Arav-Boger et al.,9

M

10

Fever, maculopapular rash

674/524

310/2.8

Oral erythromycin

14

4

3

Quioc et al.,18

F

18

Fever, epigastria, headache

72/46

212/7

Oral roxithromycin

ND

2

6

Romero-Gomez et al.,14

M

22

Fever, backpain

217/355

150/1.56

IV levofloxacin

7

4

2

Romero-Gomez et al.,14

F

22

Fever, asthenia

236/402

ND/ND

IV levofloxacin

14

4

2

Lee et al.,17

F

25

Fever, abdominal pain

584/777

70/0.5

IV levofloxacin, oral doxycycline

7

4

ND

Table 1 Outcomes of M. pneumoniae-associated acute hepatitis
AST, aspartate aminotransferase; ALT, alanine aminotransferase; ALP, alkaline phosphatase; BIL, total bilirubin; F, female; M, male; ND, non-determined; IV, intravenous; anti-IgM, anti-M. pneumonia antibodies

In general, acute hepatitis due to M. pneumoniae without lung infection has been largely documented in children with a cholesteric pattern.9,10 Hyperbilirubinemia usually occurs as the indirect type, mostly because of hemolysis in mycoplasma infections. In contrast, adults with M. pneumoniae infection have demonstrated a hepatocellular pattern of liver enzymes without jaundice.14-17 According to these reports, the fever of individuals with M. pneumoniae subsided rapidly, on average in 1 to 2 weeks after treatment, but ALT did not normalize till about one month later. The persistent ALT elevation may be mediated by immunological mechanisms, such as cross-reactive antibodies induced by M. pneumoniae interacting with sialyloligosaccharides on hepatic cells.19 The outcomes of these cases were extremely good, and no mortality was reported. In children, M. pneumoniae has been reported to be implicated in infectious mononucleosis or Kawasaki disease with hepatic manifestations.16,20

Delayed acute hepatitis after acute M. pneumoniae infection

On the basis of previous reports, the delayed onset of liver injury after M. pneumoniae infection was largely due to the use of treatment drugs.21 The time course of liver injury has been reported to be 5 to 10 days. The association of macrolide antibiotics with cholestatic hepatitis is well-known,22 and azithromycin-induced hepatotoxicity has also been reported in adults.23

Diagnosis

Because M. pneumoniae is an intracellular pathogen, cultures are not always available and those that are usually exhibit slow growth with low sensitivity, making them unreliable for routine diagnosis. There is little evidence to indicate direct invasion of M. pneumonia.14 Few previous liver pathology reports demonstrated non-specific findings, either hepatocellular destruction with inflammatory infiltration or lobular hepatitis.24,25 Since liver biopsy in patients with M. pneumoniae infection is usually nonspecific, it might not be necessary to confirm diagnosis.

The characteristic findings of patients with M. pneumoniae-associated acute hepatitis with or without pneumonia are fever, elevated liver function test, positive IgM serology against M. pneumoniae followed by IgG seroconversion, with resolution by antibiotics and exclusion of other possible etiologies. It is advisable to test simultaneously for both IgM and IgG in paired specimens collected 2 to 3 weeks apart, and a fourfold or greater rise in antibody titers indicates a current or recent infection.26 In some adults with previous M. pneumoniae infection, long-term high seroprevalence of IgG antibodies and lack of an IgM response were observed, and that imposes serious limitations on the use of serology as the sole means for diagnosis of M. pneumoniae infection.1,27 Thus, a feasible approach would be to incorporate polymerase chain reaction (PCR) and the serological studies for IgG and IgM for optimum diagnosis of M. pneumoniae infections.

Treatment and outcome

M. pneumoniaehas no cell wall and therefore is naturally resistant to penicillin, cephalosporins, all beta-lactams and vancomycin, sulfonamides, trimethoprin, and rifampin. M. pneumoniaeis susceptible to macrolides, cyclines, and quinolones. Interestingly, macrolides were more frequently used in patients with M. pneumoniae-associated hepatitis than quinolones. The reason might be that macrolides metabolize in the liver and are excreted primarily in the bile in contrast to quinolones which metabolize via renal excretion.28 Up to now, no consensus on the duration of therapy with macrolides has been reached, and treatment schemes spanning from one to three weeks have been described. Clinical outcomes have been favorable in published cases, and no associated fatalities have been reported to date. However, eradication of M. pneumoniae from immunocompromised individuals can be extremely difficult, and requires prolonged therapy.

Conclusion

M. pneumoniae is a major cause of respiratory infections and a possible etiology of acute hepatitis. Acute hepatitis due to M. pneumoniae infection is often combined with presentation of pneumonia, even without lung involvement. The most widely available and effective drug of treatment is macrolides, and its clinical outcome is extremely good.

Acknowledgments

None.

Conflicts of interest

Authors declare that there is no conflict of interest.

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