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Related Concept Videos

Pneumonia I: Introduction01:30

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Pneumonia I: Introduction01:29

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...
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Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...
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Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations01:19

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Chronic Obstructive Pulmonary Disease, or COPD, is a long-term condition marked by persistent and only partially reversible airflow limitation. It involves two overlapping conditions—chronic bronchitis and emphysema—which often co-appear but differ in dominant symptoms and underlying mechanisms.Chronic Bronchitis FeaturesChronic bronchitis presents with a persistent productive cough and thick, sometimes purulent mucus due to airway inflammation, enlarged mucus glands, and goblet cell...

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Processing of Bronchoalveolar Lavage Fluid and Matched Blood for Alveolar Macrophage and CD4+ T-cell Immunophenotyping and HIV Reservoir Assessment
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HIV-associated opportunistic pneumonias.

Laurence Huang1, Kristina Crothers

  • 1Division of Pulmonary, Department of Medicine, San Francisco General Hospital, University of California San Francisco, San Francisco, CA 94110, USA. lhuang@php.ucsf.edu

Respirology (Carlton, Vic.)
|August 4, 2009
PubMed
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HIV-associated opportunistic pneumonias remain significant causes of illness and death. While bacterial pneumonia is common in Western countries and tuberculosis in Africa, Pneumocystis pneumonia (PCP) still affects those with undiagnosed or untreated HIV infection.

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Area of Science:

  • Infectious Diseases
  • Pulmonology
  • Immunology

Background:

  • Opportunistic pneumonias are a major cause of morbidity and mortality in individuals with HIV.
  • The spectrum of these infections is diverse, encompassing bacterial, mycobacterial, fungal, viral, and parasitic pathogens.
  • Geographic variations exist, with bacterial pneumonia prevalent in Western regions and tuberculosis dominating in sub-Saharan Africa.

Purpose of the Study:

  • To review the spectrum and epidemiology of HIV-associated opportunistic pneumonias.
  • To highlight the changing incidence of specific pneumonias, such as Pneumocystis pneumonia (PCP), in the era of combination antiretroviral therapy.
  • To emphasize the clinical significance and mortality associated with less common opportunistic pneumonias.

Main Methods:

  • Literature review and synthesis of existing epidemiological data.
  • Analysis of the impact of antiretroviral therapy on the incidence of opportunistic pneumonias.
  • Categorization of pathogens based on clinical presentation and geographic distribution.

Main Results:

  • Bacterial pneumonia is the most common opportunistic pneumonia in the United States and Western Europe.
  • Tuberculosis is the leading cause of opportunistic pneumonia in sub-Saharan Africa.
  • The incidence of Pneumocystis pneumonia (PCP) has decreased with antiretroviral therapy but persists in specific patient groups; other opportunistic pneumonias, though less frequent, indicate disseminated disease and high mortality.

Conclusions:

  • HIV-associated opportunistic pneumonias represent a critical clinical challenge.
  • Effective antiretroviral therapy has altered the landscape of opportunistic infections, yet vigilance is required for undiagnosed or non-adherent patients.
  • The presence of certain opportunistic pneumonias signifies advanced disease and carries a substantial risk of mortality.