Three key points about pneumonia: 1. Pneumonia is an acute respiratory illness caused by infection in the lungs, commonly due to bacteria like Streptococcus pneumoniae. It presents with symptoms like cough, fever, and chest pain. 2. Diagnosis involves chest x-ray and investigations to identify the causative organism. Treatment depends on severity and involves oxygen, fluids, and antibiotics. Complications can include parapneumonic effusion or empyema if not treated promptly. 3. Prevention strategies include vaccination, smoking cessation, and reducing indoor air pollution. Pneumonia remains a major global cause of death despite modern treatments.

1. PNEUMONIA
“The captain of the men of death.”
“The old man's friend"
— Sir William Osler

2. Pneumonia
An acute respiratory illness associated with recently
developed radiological pulmonary shadowing which
may be segmental, lobar or multilobar. (or)
Inflammation in the lung characterized by accumulation
of secretions and inflammatory cells in alveoli.

3.  Pneumonia remains common cause of Death
 Globally Pneumonia ranked 6th
 CAP is most common cause of Severe Sepsis
 Despite introduction of Antibiotics, Imaging modalities
and Biomarker testing, mortalities related to CAP
has not changed significantly.

4. CLASSIFICATION

5. Pneumonia: Classifications
Clinically
Community-acquired pneumonia: (Typical/Atypical)
Onset in community or during 1st 2 days of hospitalization
(Strep. pneumoniae most common)
Hospital-acquired Pneumonia(HAP/nosocomial):
Occurring 48 hrs after hospitalization
Suppurative & Aspiration pneumonia
Pneumonia in immunocompromised patient: caused by
opportunistic organisms (Pneumocystis jirovecii).

6. Pneumonia: Classifications..
Anatomically
 Lobar pneumonia if one or more lobe is involved
 Broncho-pneumonia (Lobular)
1.more patchy alveolar consolidation associated
with bronchial and bronchiolar inflammation
often affecting both lower lobes
2.the pneumonic process has originated in
one or more bronchi and extends to the
surrounding lung tissue

7. Pneumonia: Classifications..
According to causes
Bacterial (the most common cause of pneumonia)
Viral pneumonia
Fungal pneumonia
Aspiration pneumonia
Chemical pneumonia (ingestion of kerosene or inhalation of
irritating substance)

8. Various defence mechanisms that protects
lung from infection
• Anatomic barriers –epiglottis,larynx
• Cough reflexes
• Tracheobronchial secretions
• Mucociliary lining
• Cell & humoral mediated immunity
• Dual phagocytic system-alveolar macrophages &
neutrophils

9. Factors that predispose to pneumonia
Reduced host defences against bacteria
• Reduced immune defences (e.g. corticosteroid
treatment, diabetes, malignancy)
• Reduced cough reflex (e.g. post-operative)
• Disordered mucociliary clearance (e.g.
anaesthetic agents)
• Bulbar or vocal cord palsy

10. Factors that predispose to pneumonia
Aspiration of nasopharyngeal or gastric secretions
• Immobility or reduced conscious level
• Vomiting, dysphagia, achalasia or severe reflux
• Nasogastric intubation
Bacteria introduced into lower respiratory tract
• Endotracheal intubation/tracheostomy
• Infected ventilators/nebulisers/bronchoscopes
• Dental or sinus infection

11. COMMUNITY-ACQUIRED PNEUMONIA
(CAP)

12. Community-acquired pneumonia (CAP)
Acc. to BTS Guidelines CAP is defined as,
Acute lower respiratory tract infection accompanied by
new infiltrates on chest radiograph or auscultatory
findings consistent with pneumonia in a patient not
hospitalized or residing in a long term care facility for
more than 2 weeks before onset of symptoms.

13. Community-acquired pneumonia (CAP)..
Most cases are spread by droplet infection.
May occur in previously healthy individuals.
Streptococcus pneumoniae remains the most common infecting
agent.
Other organisms may be involved which depends on the age of the
patient and the clinical context.
Viral infections are important causes of CAP in children, and their
contribution to adult CAP is increasingly recognized

14. Community-acquired pneumonia (CAP)..
Mycoplasma pneumoniae is more common in young people and
rare in the elderly.
Haemophilus influenzae is more common in the elderly, particularly
when underlying lung disease is present.
Legionella pneumophila occurs in local outbreaks centred on
contaminated cooling towers in hotels, hospitals and other industrial
buildings.
Staphylococcus aureus is more common following an episode of
influenza.

15. Community-acquired pneumonia (CAP)..
Cigarette smoking
Upper respiratory tract
infections
Alcohol
Corticosteroid therapy
Old age
Recent influenza infection
Pre-existing lung disease
HIV
Indoor air pollution
Factors that predispose to pneumonia

16. Community-acquired pneumonia (CAP)..
Bacteria
• Streptococcuspneumoniae
• Mycoplasma pneumoniae
• Legionella pneumophila
• Chlamydia pneumoniae
• Haemophilus influenzae
• Staphylococcus aureus
• Chlamydia psittaci
• Coxiella burnetii
(Qfever,‘querry’fever)
• Klebsiella pneumoniae
(Freidländer’s bacilus)
• Actinomyces israelii
Influenza, parainfluenza
Measles
Herpes simplex
Varicella
Adenovirus
Cytomegalovirus (CMV)
Coronavirus (Urbani
SARS- associated
coronavirus)
Organisms causing CAP
Viruses

17. PATHOPHYSIOLOGY

18. PATHOLOGY
CONGESTION
•Presence of a
proteinaceous exudate-
and often of bacteria- in
the alveoli

19. RED HEPATIZATION
• Presence of erythrocytes in
the cellular intraalveolar
exudate.
• Neutrophils are also present
• Bacteria are occasionally
seen in cultures of alveolar
specimens collected

20. GRAY HEPATIZATION
• No new erythrocytes are extravasating,
and those already present have been
lysed and degraded.
• Neutrophil is the predominant cell
• Fibrin deposition is abundant
• Bacteria have disappeared
• Corresponds with successful containment
of the infection & improvement in gas
exchange

21. RESOLUTION
Macrophage is the dominant cell type in the
alveolar space.
Debris of neutrophils, bacteria, and fibrin has
been cleared.

22. Summary
Four stages:
- Congestion – Vasodilatation
– Red Hepatization – Exudation + RBC
– Gray Hepatization - Neutro & Macrophages.
– Resolution – few macrophages, normal.

23. CLINICAL FEATURES

24. SYMPTOMS
GENERAL SYMPTOMS ADDITIONAL SYMPTOMS
• High grade fever
• Cough-productive
• Pleuritic chest pain
• Breathlessness
• Sharp or stabbing chest pain
• Headache
• Excessive sweating and
clammy skin
• Loss of appetite and fatigue
• Confusion, especially in older
people

25. GENERAL SIGNS
• Febrile
• Tachypnoea
• Tachycardia
• Cyanosis-central
• Hypotension
• Altered sensorium
• Use of accessory muscles of respiration
• Confusion- advanced cases

26. SIGNS OF CONSOLIDATION
• Percussion-dull
• Bronchial Breath sounds
• Crackles
• Increased VF & VR
• Aegophony & Whispering Pectoriloquy
• Pleural Rub

27. Differential diagnosis of pneumonia
Pulmonary infarction
Pulmonary/pleural TB
Pulmonary oedema (can be unilateral)
Pulmonary eosinophilia
Malignancy: bronchoalveolar cell carcinoma
Rare disorders: cryptogenic organising pneumonia/
bronchiolitis obliterans organising pneumonia (COP/BOOP)
Venous thromboembolism, Pulmonary haemorrhage
ARDS
Drug toxicity

28. INVESTIGATIONS

29. Investigations
The aims of investigation are
 Confirm the diagnosis
 Exclude other conditions
 Assess the severity
 Identify the development of complications
Clinical diagnosis
History
Signs & symptoms
Chest x-ray
CT
Etiological diagnosis
Gram's Stain and Culture of
Sputum
Blood Cultures
Antigen Tests
Polymerase Chain Reaction
Serology
Bronchoalveolar lavage

30. Investigations..
Full blood count
 Very high (> 20 × 109/L) or low (< 4 × 109/L) white cell
count: marker of severity
 Neutrophil leucocytosis > 15 × 109/L: suggests bacterial
aetiology
 Haemolytic anaemia: occasional complication of Mycoplasma
Erythrocyte sedimentation rate/C-reactive protein:
Non- specifically elevated
Blood culture: Bacteraemia: marker of severity

31. Investigations..
Urea and electrolytes:
Urea > 7 mmol/L (~20 mg/dL): marker of severity
Hyponatraemia: marker of severity
Liver function tests:
Abnormal if basal pneumonia inflames liver
Hypoalbuminaemia: marker of severity
Serology: Acute and convalescent titres for Mycoplasma,
Chlamydia, Legionella and viral infections
Cold agglutinins: Positive in 50% of patients with
Mycoplasma
Arterial blood gases: Measure when SaO2 < 93% or
when severe clinical features to assess ventilatory failure or
acidosis

32. Investigations..
Sputum
Sputum samples
Gram stain, culture and antimicrobial sensitivity
testing, AFB, KOH mount
Oropharynx swab
PCR for Mycoplasma pneumoniae and
other atypical pathogens

33. Investigations..
Urine
Pneumococcal and/or Legionella antigen
Pleural fluid
Always aspirate and culture when present in more
than trivial amounts, preferably with ultrasound
guidance

34. Investigations..
Chest X-ray
Lobar pneumonia
Patchy opacification evolves into homogeneous consolidation
of affected lobe
Air bronchogram (air-filled bronchi appear lucent against
consolidated lung tissue) may be present.
Bronchopneumonia: Typically patchy and segmental shadowing
Complications: Para-pneumonic effusion, intrapulmonary
abscess or empyema
Staph.aureus: Suggested by multilobar shadowing, cavitation,
pneumatocoeles and abscesses

37. AssessmentOfSeverity

39. ***intensive respiratory or vasopressor support

41. MANAGEMENT

42. Management
The principles of management focusing on
Adequate oxygenation
Appropriate fluid balance
Antibiotics
In severe or prolonged illness,
Nutritional support may be required
Evaluate the effectiveness of administered medications
Explain all procedures to the patient and family

43. Management…
Oxygen
Oxygen should be administered to all patients with
tachypnoea,
hypoxaemia,
hypotension or
Acidosis
The aim of maintaining the PaO2 at or above 60mmHg
or the SaO2 at or above 92%.

44. Management….
Oxygen
High concentrations (35% or more), preferably
humidified, should be used in all patients who do not
have hypercapnia associated with COPD.
Continuous positive airway pressure (CPAP) should
be considered in those who remain hypoxic despite
this and these patients should be managed in a high-
dependency or intensive care environment, where
mechanical ventilation can be rapidly employed.

45. Management…
Intravenous fluids
These should be considered in patients with severe
illness, older patients and those who are vomiting.
Otherwise, an adequate oral intake of fluid should be
encouraged.
Inotropic support may be required in patients with
shock

46. Management…
Antibiotics
Prompt administration of antibiotics improves the outcome.
The initial choice of antibiotic is guided by
clinical context,
severity assessment,
local knowledge of antibiotic resistance patterns
any available epidemiological information.
The choice of empirical antibiotic therapy is considerably more
challenging, due to
Diversity of pathogens
Drug resistance.

47. Management…
Uncomplicated CAP:
Outpatient Treatment (empirical)
Previously healthy and no antibiotics in past 3 months
* A macrolide (clarithromycin or azithromycin or Doxycycline )
Comorbidities or antibiotics inpast 3 months:
Respiratory fluoroquinolone [moxifloxacin ,levofloxacin ]or
β- lactam ( high-dose amoxicillin or amoxicillin/clavulanate)

48. Management…
Inpatient Treatment- Non ICU:
•A respiratory fluoroquinolone [moxifloxacin ,levofloxacin ]
•β -lactam [cefotaxime ,ceftriaxone ,ampicillin] plus a
macrolide [oral clarithromycin or azithromycin)
Inpatient Treatment- ICU:
•β -lactam plus Azithromycin or a fluoroquinolone

49. Management…
Pseudomonas:
MRSA
• If MRSA, add linezolid or vancomycin
• An antipneumococcal, antipseudomonal β-lactam
[piperacillin/tazobactam, cefepime , imipenem ,
meropenemplus flouroquinolones]
• Above β-lactams plus an aminoglycoside and azithromycin
• Above β-lactams plus an aminoglycoside plus
an antipneumococcal fluoroquinolone

50. Management…
Pain
It is important to relieve pleural pain, as it may prevent the
patient from breathing normally and coughing efficiently.
For the majority, simple analgesia with paracetamol, co-codamol
or NSAIDs is sufficient.
In some patients, opiates may be required but these must be
used with extreme caution in patients with poor respiratory
function, as they may suppress ventilation.
Physiotherapy
May help expectoration in those who suppress cough because of
pleural pain.

51. Prevention

52. Preventive measures
Current smokers should be advised to stop smoking
Influenza Vaccine & Pneumococcal Vaccine should be
considered in selected pts
In developing countries, tackling malnutrition & Indoor air
pollution
Immunization against measles, pertussis & Haemophillus
influenzae type b in children
Legionella pneumophila has important public health
implications and usually requires notification to the
appropriate health authority.

53. COMPLICATIONS

54. Complication of pneumonia
Para-pneumonic effusion – common
Empyema
Retention of sputum causing lobar collapse
Broncho-pleural Fistula
Organizing Pneumonia
Bronchiectasis
Deep vein thrombosis and pulmonary embolism

55. Complication of pneumonia…
Hypoxemia
Pneumothorax, particularly with Staph. aureus
Suppurative pneumonia/lung abscess
ARDS, renal failure, multi-organ failure.
Atelectasis
Respiratory failure (which requires mechanical ventilator)
Ectopic abscess formation (Staph. aureus)
Hepatitis, pericarditis, myocarditis, meningoencephalitis

56. Always take
proper
detailed
history
of a patient.