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                       Adult Respiratory Distress Syndrome

 


         

Pulmonary infection occurs when normal lung or systemic defense mechanisms are impaired.    Visit: Pulmonary Pathology Online

Pneumonia and influenza account for a number deaths all over the world and are the fifth leading cause of death, exceeded only by heart disease, cancer, cerebrovascular disease and accidents.

Pneumonia can be broadly define as any infection in the lung.

Acute pneumonias may be caused by pyogenic bacteria  that induce primarily neutrophilic exudates in alveoli, bronchioles and bronchi or by a miscellaneous group of microorganisms that induce predominantly peribronchiolar and interstitial mononuclear inflammation.

The term Pneumonitis refers to the inflammatory conditions that primarily affect the interstitium.  It presents clinically as "atypical" pneumonias.

Chronic pneumonia is caused by -  Nocardia and Actinomyces species and other parasites, fungi and intracellular bacteria .

Bacterial infections occur in two frequently overlapping morphologic patterns (bronchopneumonia and lobar pneumonia ) and can be caused by a variety of gram-positive and gram-negative organisms.

Depending on bacterial virulence and host resistance, the same organism may in one case cause  bronchopneumonia and in another case lobar pneumonia and sometimes intermediate involvement.

Nosocomial pneumonias develop in a number of hospitalized patients specially in critically ill patients admitted to intensive care units.

With the use of potent therapies that deliberately or incidentally produce immunosuppression there is a great risk of developing respiratory infection.

Pathogenetic organisms gain access to lung:

(i) through the airways ; (ii) through the bloodstream ; (iii) by traumatic implantation ; (iv) by a direct spread across the diaphragm from a subphrenic source, probably through the lymphatics.

The most common route is the airways. Airway spread can result from inhalation of the organism as an aerosol on droplet nuclei.

 This is a major mechanism of spread of many viral infections and of tuberculosis.

Often development of infection begins with colonization of the upper respiratory tract by potential pathogens followed by aspiration into the lower respiratory tract.

This is a major mechanism for many of the gram-negative organisms.

                

Following factors interfere with normal lung defence and cause lung infection :

- Depressed bactericidal and phagocytic function of macrophage caused by starvation, alcohol ingestion, hypoxia, uremia, air pollutant, cigarette smoke and previous viral infection.

- Decrease or loss of cough reflex leading to aspiration caused by drug , anesthesis or coma.

-  Pulmonary Edema -  (a good culture medium).

- Collection of secretion.

- Poor mucociliary elevator function from smoking, infection etc.

- Cystic fibrosis, airway obstruction, chronic bronchitis .

 PULMONARY INFECTION

Viral Infection:

Viruses are a common cause of airway lesions but those that primarily affect the airways may also severely affect the lung parenchyma. It is important to note that viral lung infections produce interstitial (rather than alveolar) pneumonia and diffuse alveolar damage.

Influenza (Orthomyxoviruses)

Cytomegalovirus infection

Measles

Varicella

Chlamydia: Chlamydial Infection 

Rickettsia: Q Fever(Coxiella burnetii)

Mycoplasma:  Mycoplasma pneumonia

Bacterial Infection:

Pneumococcal Pneumonia (Lobar Pneumonia)

Bronchopneumonia

Klebsiella pneumoniae

Haemophilus influenza Infection

Legionellosis(Legionnaires'Disease)

Staphylococcal Infection

Streptococcal Infection

Tuberculosis

Atypical Mycobacterial Infection

Mycobacterium Avium Intracellulare

Mycobacterium Kansasii Infection

                     

Fungal Infection:

Histoplasmosis (Histoplasma Capsulatum)

Coccidioidomycosis

Cryptococcus

Blastomycosis

Aspergilloma

Aspergillosis

Candidosis(Candidiasis)

Actinomycosis

Nocardiosis

Infections caused by other organisms

Pneumocystis Pneumonia

Dirofilariasis

 

 
 May 2009
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PULMONARY PATHOLOGY

Congenital Cystic Adenomatoid  Malformation

Acute Respiratory Distress Syndrome

Bronchiolitis

Emphysema

Bronchial Asthma

Pulmonary Alveolar Proteinosis

Pulmonary edema

Chronic Bronchitis

Pulmonary Infection

Pneumococcal Pneumonia

Haemophilus influenza Infection

Klebsiella Pneumoniae

Mycoplasma Pneumonia

Pneumocystis Pneumonia

Legionellosis (Legionnaires' Disease)

Localized Fibrous Tumour of the Pleura

Lymphomatoid Granulomatosis

Biphasic Epithelial/Mesenchymal Lung Tumours

Pulmonary Carcinosarcoma

Pulmonary Blastoma

Large Cell Neuro-endocrine tumour

Adenovirus

African Histoplasmosis

African Trypanosomiasis

Amebic Meningoencephalitis

American Trypanosomiasis

Ancylostomiasis

Angiostrongyliasis

Anisakiasis

Anthrax Infection

Ascariasis

Babesiosis

Bacillary angiomatosis

Balantidiasis

Bartonellosis

Chikungunya

Dengue

Dermatophytosis

Diphtheria

Diphyllobothriasis

Dracunculiasis

Escherichia coli Infection

Epstein-Barr Virus infection

Filariasis

Filovirus

Flavivirus

Fungal Infections

Furuncle

German measles

Giardiasis

Gonococcal Infection 

Granuloma Inguinale 

Hand, foot & mouth disease

Herpes Simplex Virus Infection

Herpes Zoster Virus


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