Mycobacterium avium-intracellulare infection


Mycobacterium avium-intracellulare infection
Mycobacterium intracellulare
Scientific classification
Kingdom: Bacteria
Phylum: Actinobacteria
Order: Actinomycetales
Suborder: Corynebacterineae
Family: Mycobacteriaceae
Genus: Mycobacterium
Species: M. avium
Binomial name
Mycobacterium avium
Lady Windermere syndrome
Classification and external resources

CT scan of patient with right middle lobe aspiration and Mycobacterium avium infection consistent with Lady Windermere syndrome
ICD-10 A31.0
ICD-9 031.0
DiseasesDB 29182
eMedicine med/1532
MeSH D015270

Mycobacterium avium-intracellulare (MAI)[1] is an atypical mycobacterial infection which can occur in the later stages of AIDS. It can also affect people who do not have AIDS and usually first presents as a persistent cough. Additionally, cases in elderly men have increased recently. It is typically treated with a series of 3 antibiotics for a period of at least 6 months.

It is a saprotrophic organism that is present in soil and water, entry is usually via the GI tract but also can be via the lungs.

It causes fevers, diarrhea, malabsorption and anorexia and it can disseminate to the bone marrow. Therapy for MAI is disappointing as it is typically resistant to standard mycobacterial therapies.

Contents

Sources and symptoms

MAC bacteria are common in the environment and cause infection when inhaled or swallowed. Symptoms of MAC diseases are reminiscent of tuberculosis. They include fever, fatigue, and weight loss. Many patients will have anemia and neutropenia if bone marrow is involved. Pulmonary involvement is similar to TB, while diarrhea and abdominal pain are associated with gastrointestinal involvement. MAC should always be considered in a person with HIV infection presenting with diarrhea. Recently, M. avium has been found to deposit and grow in bathroom shower heads from which it may be easily aerosolized and inhaled.[2]

The various subspecies are prevalent in different areas:

  • MAA primarily affects birds, but has also been found in the group of mammals known as ruminants, especially deer;
  • MAP causes paratuberculosis, or Johne's Disease;

MAC disease is common in immunocompromised individuals, including senior citizens and those suffering from HIV or cystic fibrosis; however, the MAC diseases, particularly Lady Windermere syndrome, do not require that the individual be immunocompromised.

Mycobacterium avium infection in children

The M. avium and M. haemophilum infection in children form a distinct clinical entity, not associated with abnormalities of the immune system. M. avium typically causes swelling of the lymph nodes of the neck that is usually unilateral. This node is firm at beginning, but a collarstud abscess is formed eventually which is characteristic blue purple in colour with multiple discharging sinuses. The treatment of choice is surgical excision of the affected lymph nodes,[3] with antibiotic treatment (usually clarithromycin and rifabutin for 18 to 24 months) reserved for those patients who cannot have surgery.

MAC in patients with HIV infection

MAC in patients with HIV disease is theorized to represent recent acquisition rather than latent infection reactivating (which is the case in many other opportunistic infections in immunocompromised patients).

The risk of MAC is inversely related to the patient's CD4 count, and increases significantly when the CD4 count decreases below 50 cells/mm³. Other risk factors for acquisition of MAC infection include using an indoor swimming pool, consumption of raw or partially cooked fish or shellfish, bronchoscopy and treatment with granulocyte stimulating factor.

Disseminated disease was previously the common presentation prior to the advent of highly active antiretroviral therapy (HAART). Today, in regions where HAART is the standard of care, localized disease presentation is more likely. This generally includes a focal lymphadenopathy/lymphadenitis.

AIDS patients are given macrolide antibiotics such as Azithromycin for prophylactic treatment.

Diagnosis

Diagnosis can be achieved through blood cultures, or cultures of other bodily fluids such as sputum. Bone marrow culture can often yield an earlier diagnosis, but is usually avoided as an initial diagnostic step because of its invasiveness.

Prophylaxis

Clarithromycin may be used for prophylaxis.[4]

Treatment

Treat prophylactically with azithromycin.

Post-infection, treatment involves a combination of antituberculosis antibiotics. These include:

Lady Windermere syndrome

"Lady Windermere syndrome" describes infection in the lungs due to Mycobacterium avium complex.[5] It is named after a character in Oscar Wilde's play Lady Windermere's Fan.[6]

Classification

Lady Windermere syndrome is a type of mycobacterial lung infection.[7]

Signs and symptoms

Patients with Lady Windermere syndrome experience chronic cough, shortness of breath, fatigue and other less specific symptoms.

Pathophysiology

Mycobacterium avium complex is the most commonly found form of non-tuberculous mycobacteria.[8]

Immunodeficiency is not a requirement for Mycobacterium avium infection.[9]

Mycobacterium avium Complex (MAC) usually affects patients with abnormal lungs or bronchi. However, Candace Baker, Jerome Reich and Richard Johnson describe a series of six patients with MAC infection of the right middle lobe or left lingula who did not have any predisposing lung disorders.

The right middle lobe and left lingula of the lungs are served by bronchi that are oriented downward when a person is in the upright position. As a result, these areas of the lung may be more dependent upon vigorous voluntary expectoration (cough) for clearance of bacteria and secretions.

Since the six patients in their retrospective case series were older females, Reich and Johnson and Baker propose that patients without a vigorous cough may develop right middle lobe or left lingular infection with MAC. They propose that this syndrome be named Lady Windermere syndrome, after the character Lady Windermere in Oscar Wilde's play Lady Windermere's Fan.

Diagnosis

The diagnosis requires consistent symptoms with two additional signs:

Treatment

Lady Windermere syndrome is usually treated with a three-drug regimen of either clarithromycin or azithromycin, plus rifampicin and ethambutol. Treatment typically lasts at least 12 months.

Literary reference

The original Chest article proposing the existence and pathophysiology of the Lady Windermere syndrome suggests that the character Lady Windermere in Oscar Wilde's Victorian-era play Lady Windermere's Fan is a good example of the fastidious behavior believed to cause the syndrome. The article states:

We offer the term, Lady Windermere's Syndrome, from the Victorian-era play, Lady Windermere's Fan, to convey the fastidious behavior hypothesized: "How do you do, Lord Darlington. No, I can't shake hands with you. My hands are all wet with the roses."

Victorian women presumably believed that "Ladies don't spit," and consequently might have been predisposed to develop lung infection.

Shortly after the Lady Windermere syndrome was proposed, a librarian wrote a letter to the editor of Chest[10] challenging the use of Lady Windermere as the eponymous ancestor of the proposed syndrome. In Lady Windermere's Fan, Lady Windermere is a vivacious young woman, married only 2 years, who never coughs or displays any other signs of illness. While her avoidance of shaking hands might be interpreted as "fastidiousness," two alternative explanations may be just as probable:

1) Lady Windermere actually is in the midst of arranging flowers and consequently cannot properly greet her guest:
[LADY WINDERMERE is at table R., arranging roses in a blue bowl.][11]
2) Lady Windermere wishes to discourage the flirtatious advances of her would-be suitor Lord Darlington and cites her wet hands as an excuse to keep him from touching her:
LADY WINDERMERE. Lord Darlington, you annoyed me last night at the Foreign Office. I am afraid you are going to annoy me again. . . .
LORD DARLINGTON. [Takes chair and goes across L.C.] I am quite miserable, Lady Windermere. You must tell me what I did. [Sits down at table L.]
LADY WINDERMERE. Well, you kept paying me elaborate compliments the whole evening.][11]

The scholars highlight the literary malapropism,[12] but some in the medical community have adopted the term regardless, and peer-reviewed medical journals still sometimes mention the Lady Windermere syndrome.[13]

In recent years, some have described the eponym as inappropriate,[14] and some have noted that it would have been unlikely that Lady Windermere had the condition to which her name was assigned.[15]

See also

References

  1. ^ Medscape Reference - Mycobacterium Avium-Intracellulare Author: Janak Koirala, MD, MPH, FACP, FIDSA; Chief Editor: Burke A Cunha, MD, Updated: Jan 12, 2011
  2. ^ Showerheads may harbor bacteria dangerous to some By RANDOLPH E. SCHMID, AP Science Writer Randolph E. Schmid, Ap Science Writer – Mon Sep 14, 9:19 pm ET
  3. ^ Lindeboom JA, Kuijper EJ, van Coppenraet ESB, Lindeboom R, Prins JM (2007). "Surgical excision versus antibiotic treatment for nontuberculous mycobacterial cervicofacial lymphadenitis in children: A multicenter, randomized, controlled trial". Clin Infect Dis 44 (8): 1057–64. doi:10.1086/512675. PMID 17366449. http://www.journals.uchicago.edu/doi/full/10.1086/512675. 
  4. ^ Paul Volberding; Merle A. Sande (2008). Global HIV/AIDS medicine. Elsevier Health Sciences. pp. 361–. ISBN 9781416028826. http://books.google.com/books?id=fNU62HhYFT0C&pg=PA361. Retrieved 5 November 2010. 
  5. ^ Reich JM, Johnson RE (June 1992). "Mycobacterium avium complex pulmonary disease presenting as an isolated lingular or middle lobe pattern. The Lady Windermere syndrome". Chest 101 (6): 1605–9. doi:10.1378/chest.101.6.1605. PMID 1600780. http://www.chestjournal.org/cgi/reprint/101/6/1605. 
  6. ^ Wilde, Oscar (1940). The Importance of Being Earnest and Other Plays. Penguin. ISBN 0-14-048209-1. 
  7. ^ Subcommittee Of The Joint Tuberculosis Committee Of The British Thoracic Society, (March 2000). "Management of opportunist mycobacterial infections: Joint Tuberculosis Committee Guidelines 1999. Subcommittee of the Joint Tuberculosis Committee of the British Thoracic Society". Thorax 55 (3): 210–8. doi:10.1136/thorax.55.3.210. PMC 1745689. PMID 10679540. http://thorax.bmj.com/cgi/pmidlookup?view=long&pmid=10679540. 
  8. ^ Wickremasinghe M, Ozerovitch LJ, Davies G, et al. (December 2005). "Non-tuberculous mycobacteria in patients with bronchiectasis". Thorax 60 (12): 1045–51. doi:10.1136/thx.2005.046631. PMC 1747265. PMID 16227333. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1747265. 
  9. ^ Martins AB, Matos ED, Lemos AC (April 2005). "Infection with the Mycobacterium avium complex in patients without predisposing conditions: a case report and literature review". Braz J Infect Dis 9 (2): 173–9. doi:/S1413-86702005000200009. PMID 16127595. http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702005000200009&lng=en&nrm=iso&tlng=en. 
  10. ^ "Chest -- eLetters for Reich and Johnson, 101 (6) 1605-1609". http://www.chestjournal.org/cgi/eletters/101/6/1605#85. 
  11. ^ a b "Oscar Wilde: Lady Windermere's Fan: ACT I. Morning-room in Lord Windermere's house. - Free Online Library". http://wilde.thefreelibrary.com/Lady-Windermeres-Fan/1-1. 
  12. ^ "oscholars". http://ics.leeds.ac.uk/papers/ids/exhibits/250/Vol_III_No_9.doc. 
  13. ^ Sexton P, Harrison AC (June 2008). "Susceptibility to nontuberculous mycobacterial lung disease". Eur. Respir. J. 31 (6): 1322–33. doi:10.1183/09031936.00140007. PMID 18515557. http://erj.ersjournals.com/cgi/pmidlookup?view=long&pmid=18515557. 
  14. ^ Kasthoori JJ, Liam CK, Wastie ML (February 2008). "Lady Windermere syndrome: an inappropriate eponym for an increasingly important condition" (PDF). Singapore Med J 49 (2): e47–9. PMID 18301826. http://smj.sma.org.sg/4902/4902cr6.pdf. 
  15. ^ Rubin BK (October 2006). "Did Lady Windermere have cystic fibrosis?". Chest 130 (4): 937–8. doi:10.1378/chest.130.4.937. PMID 17035420. http://www.chestjournal.org/cgi/pmidlookup?view=long&pmid=17035420. 

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