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Pneumonia Overview
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Pneumonia Overview
Pneumonia Overview
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1
Question
What is pneumonia?
Answer
An infection of the lung parenchyma that leads to inflammation and alveolar consolidation, impairing gas exchange.
2
Question
List the common causes of pneumonia.
Answer
Bacteria, viruses, fungi, or aspiration of foreign material.
3
Question
Describe the three ways pathogens can enter the lungs in pneumonia.
Answer
Inhalation of aerosolized droplets, aspiration of oropharyngeal/gastric contents, or hematogenous spread.
4
Question
What is the role of alveolar macrophages in the pathophysiology of pneumonia?
Answer
They initiate an immune response, leading to the release of cytokines.
5
Question
Name the major cytokines released during the immune response in pneumonia and their effect.
Answer
TNF, IL-1, and IL-6, leading to inflammation.
6
Question
How does alveolar exudate contribute to impaired gas exchange in pneumonia?
Answer
It replaces air, leading to hypoxia and dyspnoea.
7
Question
List the classifications of pneumonia based on different criteria.
Answer
Site of acquisition, pathogen type, anatomical/radiological pattern, and severity.
8
Question
What are the classifications of pneumonia based on the site of acquisition?
Answer
Community-Acquired Pneumonia (CAP), Nosocomial/Hospital-Acquired Pneumonia (HAP), Healthcare-Associated Pneumonia, Aspiration Pneumonia, and Chronic Pneumonia.
9
Question
Where is Community-Acquired Pneumonia (CAP) acquired?
Answer
Outside of healthcare settings.
10
Question
What is the most common bacterial cause of Community-Acquired Pneumonia (CAP)?
Answer
Streptococcus pneumoniae.
11
Question
Which bacterial cause of CAP is common in the elderly and individuals with COPD?
Answer
Haemophilus influenzae.
12
Question
Which bacterial cause of CAP is common in young adults and is considered an atypical pneumonia?
Answer
Mycoplasma pneumoniae.
13
Question
Which bacterial cause of CAP is associated with contaminated air conditioning systems?
Answer
Legionella pneumophila.
14
Question
Give four examples of host defense mechanisms against lung infections.
Answer
Mucociliary clearance, alveolar macrophages, secretory IgA/surfactant, cough reflex.
15
Question
What is mucociliary clearance?
Answer
The process by which cilia and mucus trap pathogens and move them out of the respiratory system.
16
Question
How do alveolar macrophages protect against lung infections?
Answer
They are the first line of immune defense in the alveoli.
17
Question
What roles do secretory IgA and surfactant play in lung defense?
Answer
Provide local immunity and reduce pathogen adherence.
18
Question
How does the cough reflex protect against lung infections?
Answer
Helps expel pathogens and irritants.
19
Question
List factors that can disrupt lung defenses and increase the risk of infection.
Answer
Smoking, viral infections, immunosuppression, loss of cough reflex.
20
Question
Why are the lungs susceptible to infections?
Answer
Constant exposure to airborne pathogens, large surface area for microbial invasion, close interaction with the circulatory system, aspiration risk.
21
Question
What are the common clinical features of pneumonia?
Answer
Acute fever, productive cough, pleuritic chest pain, dyspnoea.
22
Question
What is Hospital-Acquired Pneumonia (HAP) and when does it occur?
Answer
Pneumonia that occurs 48 hours after hospital admission.
23
Question
What are some common causes of Hospital-Acquired Pneumonia (HAP)?
Answer
Pseudomonas aeruginosa (ventilated patients), Staphylococcus aureus (MRSA), Klebsiella pneumoniae (alcoholics, diabetics).
24
Question
What are the clinical features of Hospital-Acquired Pneumonia (HAP)?
Answer
New or worsening infiltrates on chest X-ray, purulent sputum, high fever, sepsis risk.
25
Question
What is Healthcare-Associated Pneumonia?
Answer
Occurs in mechanically ventilated patients 48 hours post-intubation or patients that have undergone a medicalsurgical procedure.
26
Question
What is Aspiration Pneumonia and what are its risk factors?
Answer
Pneumonia due to inhalation of gastric/oropharyngeal contents. Risk factors: Stroke, neuromuscular disease, dysphagia, alcohol intoxication, anesthesia, GERD.
27
Question
What are common pathogens associated with Aspiration Pneumonia?
Answer
Anaerobes (Bacteroides, Fusobacterium, Peptostreptococcus), Gram-negatives (Klebsiella pneumoniae).
28
Question
What are the clinical features of Aspiration Pneumonia?
Answer
Right lower lobe pneumonia, foul-smelling sputum, lung abscess formation.
29
Question
What is Lobar Pneumonia and what pathogen is commonly associated with it?
Answer
Pneumonia affecting an entire lobe, commonly associated with Streptococcus pneumoniae.
30
Question
What are the stages of Lobar Pneumonia?
Answer
Congestion (Day 1-2), Red Hepatization (Day 3-4), Gray Hepatization (Day 5-7), Resolution (Day 8).