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Related Concept Videos

Pneumonia I: Introduction01:29

Pneumonia I: Introduction

1
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...
1
Pneumonia I: Introduction01:30

Pneumonia I: Introduction

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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...
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Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

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Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
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Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

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The pathophysiology of pneumonia involves the following steps:
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Pneumothorax-I01:26

Pneumothorax-I

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A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
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Pneumonia V: Nursing management and Prevention01:30

Pneumonia V: Nursing management and Prevention

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Nursing management of pneumonia involves promoting airway patency, facilitating rest and conserving energy, encouraging fluid intake, maintaining nutrition, and educating patients.
The nurse must practice strict medical asepsis and adhere to infection control guidelines to minimize healthcare-associated infections.
Enhance airway patency
Position the patient correctly to facilitate drainage of the affected lung segments. Manual or mechanical percussion and vibration can also be employed....
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Related Experiment Video

Updated: Apr 18, 2026

Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling
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Visualization of Streptococcus pneumoniae within Cardiac Microlesions and Subsequent Cardiac Remodeling

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Cardiotoxicity during invasive pneumococcal disease.

Armand O Brown1, Elizabeth R C Millett, Jennifer K Quint

  • 11 Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas; and.

American Journal of Respiratory and Critical Care Medicine
|January 29, 2015
PubMed
Summary

Streptococcus pneumoniae can invade heart tissue, causing cardiac dysfunction and potential long-term damage. Understanding these host-pathogen interactions may lead to new treatments for invasive pneumococcal disease and its cardiac complications.

Keywords:
Streptococcus pneumoniaeheart failureinvasioninvasive pneumococcal diseasepathogenesis

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Area of Science:

  • Cardiology
  • Infectious Diseases
  • Microbiology

Background:

  • Streptococcus pneumoniae is a primary cause of pneumonia and sepsis.
  • Invasive pneumococcal disease is associated with a significant incidence of adverse cardiac events in hospitalized adults.
  • Cardiac dysfunction is a serious complication of invasive pneumococcal disease.

Purpose of the Study:

  • To review host-pathogen interactions contributing to cardiac dysfunction during invasive pneumococcal disease.
  • To elucidate mechanisms of cardiomyocyte damage and cardiac invasion by S. pneumoniae.
  • To explore potential therapeutic strategies targeting these interactions.

Main Methods:

  • Review of scientific literature on host-pathogen interactions in invasive pneumococcal disease.
  • Analysis of mechanisms of S. pneumoniae translocation into the myocardium.
  • Discussion of bacterial virulence factors and their role in cardiomyocyte cell death.

Main Results:

  • S. pneumoniae inhibits cardiomyocyte contractility via its cell wall.
  • S. pneumoniae translocates into the myocardium, forming microscopic lesions.
  • Pneumolysin and hydrogen peroxide are key factors in cardiomyocyte death.
  • Choline-binding protein A and platelet-activating factor receptor mediate cardiac invasion.
  • Collagen deposition and potential cardiac scarring observed in recovered mice.

Conclusions:

  • Host-pathogen interactions, including bacterial translocation and virulence factors, drive cardiac dysfunction in pneumococcal disease.
  • Targeting bacterial adhesins and host receptors may protect against cardiac damage and meningitis.
  • Cardiac scarring post-infection could explain increased risk of sudden death.