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Pneumonia

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Introduction,Risk factors ,Pathogenesis,Types,Etiology,Clinical features,Investigation,Treatment,Complication,Prevention

Publié dans : Santé & Médecine
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Pneumonia

  1. 1. PNEUMONIA Dr Muhammed Aslam MBBS , MD Pulmonary Medicine
  2. 2. KUHS Exam - Model Question Essay Question- 10 Marks (1+2+3+2+2=10) 60 yrs old male smoker with DM presented to OPD with high grade fever , right sided chest pain and cough with rusty sputum for 1 week ? •Give your provisional diagnosis ? •How will you diagnose? •What are the causes and pathogenesis ? •How will you Manage? •What are the complications ?
  3. 3. Outline •Introduction •Risk factors •Pathogenesis •Types •Etiology •Clinical features •Investigation •Treatment •Complication •Prevention
  4. 4. Pneumonia Pneumonia is an infection in one or both lungs. Pneumonia causes inflammation in the alveoli. The alveoli are filled with fluid or pus, making it difficult to breathe. 
  5. 5. DEFINITION •“inflammation and consolidation of lung tissue due to an infectious agent” • COSOLIDATION = ‘Inflammatory induration of a normally aerated lung due to the presence of cellular exudative in alveoli’
  6. 6. How does Pneumonia develop? •Most of the time, the body filters organisms. •This keeps the lungs from becoming infected. •But organisms sometimes enter the lungs and cause infections. •This is more likely to occur when: •immune system is weak. •organism is very strong. •body fails to filter the organisms. • •
  7. 7. Factors that predispose to Pneumonia Cigarette smoking Upper respiratory tract infections Alcohol Corticosteroid therapy Old age Recent influenza infection Pre-existing lung disease
  8. 8. 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
  9. 9. 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
  10. 10. Factors that predispose to Pneumonia Bacteraemia Abdominal sepsis Intravenous cannula infection Infected emboli
  11. 11. How does Pneumonia develop?
  12. 12. PATHOLOGY Congestion •Presence of a proteinaceous exudate—and often of bacteria—in the alveoli
  13. 13. RED HEPATIZATION •Presence of erythrocytes in the cellular intraalveolar exudate •Neutrophils are also present •Bacteria are occasionally seen in cultures of alveolar specimens collected
  14. 14. Normal Lung Red Hepatization
  15. 15. 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 and improvement in gas exchange
  16. 16. RESOLUTION Macrophage is the dominant cell type in the alveolar space Debris of neutrophils, bacteria, and fibrin has been cleared
  17. 17. Types of Pneumonia
  18. 18. ANATOMICAL CLASSIFICATION 1.Bronchopneumonia affects the lungs in patches around bronchi 1.Lobar pneumonia is an infection that only involves a single lobe, or section, of a lung. 1.Interstitial pneumonia involves the areas in between the alveoli
  19. 19. CLINICAL CLASSIFICATION 1)Community Acquired - Typical/Atypical/Aspiration 1)Pneumonia in Elderly 1)Nosocomial- HAP,VAP,HCAP 1)Pneumonia in Immunocompromised host
  20. 20. Community Acquired Pneumonia (CAP) DEFINITION: •An infection of the pulmonary parenchyma •Associated with symptoms of a/c infection •Presence of a/c infiltrates on CXR or auscultatory findings consistent with Pneumonia •In a patient not hospitalized or residing in LTC facility for > 14 days prior •
  21. 21. Hospital Acquired pneumonia - HAP •HAP is defined as pneumonia that occurs 48 hours or more after admission, which was not incubating at the time of admission. •
  22. 22. Ventilator Associated Pneumonia- VAP •VAP refers to pneumonia that arises more than 48–72 hours after endotracheal intubation . •
  23. 23. Health Care Associated Pneumonia HCAP HCAP includes any patient •Who was hospitalized in an acute care hospital for 2 or more days within 90 days of the infection •Resided in a nursing home or long-term care facility •Received recent i.v antibiotic therapy, chemotherapy, or wound care within the past 30 days of the current infection •Attended a hospital or hemodialysis clinic •
  24. 24. ATYPICAL PNEUMONIA - Why ‘Atypical’? Clinically •Subacute onset •Fever less common or intense •Minimal sputum Microbiologically •Sputum does not reveal a predominant microbial etiology on routine smears (Gram’s stain, Ziehl-Neelsen) or cultures •
  25. 25. ATYPICAL PNEUMONIA - Why ‘Atypical’? Radiologically •Patchy infiltrates or •Interstitial pattern Haemogram •Peripheral leukocytosis are less common or intense
  26. 26. Causes of Atypical Pneumonia
  27. 27. Aspiration pneumonia •Overt episode of aspiration or bronchial obstruction by a foreign body. •Seen in - alcoholism, nocturnal esophageal reflux, a prolonged session in the dental chair, epilepsy •Usually Anaerobes
  28. 28. ELDERLY •Infection has a more gradual onset, with less fever and cough •often with a decline in mental status or confusion and generalized weakness •often with less readily elicited signs of consolidation
  29. 29. MICROBIOLOGY
  30. 30. Etiology Bacterial Viral mycobacterial Fungal parasitic
  31. 31. Etiology Microbiological diagnosis - 40-71% Streptococcus pneumoniae most common Viruses – 10-36% In India - Streptococci pneumonia (35.3%) Staphylococcus aureus (23.5%) Klebsiella pneumonia (20.5%) Haemophilus influenzae (8.8%) Mycoplasma pneumoniae Legionella pneumophila
  32. 32. VAP Micro Harrison's Principles of Internal Medicine
  33. 33. GENERAL SYMPTOMS •High grade fever •Cough-productive •Pleuritic chest pain •Breathlessness
  34. 34. Additional symptoms •Sharp or stabbing chest pain •Headache • •Excessive sweating and clammy skin • •Loss of appetite and fatigue • •Confusion, especially in older people • •
  35. 35. General Signs •Febrile •Tachypnoea •Tachycardia •Cyanosis-central •Hypotension •Altered sensorium •Use of accessory muscles of respiration •Confusion- advanced cases
  36. 36. SIGNS OF CONSOLIDATION •Percussion-dull •Bronchial Breath sounds •Crackles • •Increased VF & VR • •Aegophony & Whispering Pectoriloquy • •Pleural Rub
  37. 37. INVESTIGATIONS
  38. 38. SPUTUM •Gram Staining •AFB •Giemsa or methenamine silver stain •KOH mount •Culture
  39. 39. X Ray Homogenous opacity with air bronchogram
  40. 40. LOBAR PNEUMONIA •Peripheral airspace consolidation pneumonia •Without prominent involvement of the bronchial tree
  41. 41. RUL Consolidation
  42. 42. RML Consolidation
  43. 43. RLL Consolidation
  44. 44. BRONCHOPNEUMONIA •Centrilobular and Peribronchiolar opacity pneumonia •Tends to be multifocal •Patchy in distribution rather than localized to any one lung region
  45. 45. INTERSTITIAL PNEUMONIA •Peribronchovascular Infiltrate •Mycoplasma , viral
  46. 46. CT THORAX Seldom used
  47. 47. INVESTIGATIONS •Complete white blood count •Blood Sugar •Electrolytes •Creatinine •Blood culture •Screening for retro(ICTC) •Oxygen saturation by pulse oximetry •ABG •USG Chest •Mantaux
  48. 48. INVASIVE •Bronchoscopy •Thoracoscopy •Percutaneous aspiration/biopsy •Open lung biopsy •Pleural aspiration
  49. 49. OTHER TESTS •Bacterial antigen in sputum and urine •Rapid viral antigen detection in respiratory secretion •Serological- mainly for atypical •Molecular study •C-reactive Protein, serum procalcitonin, and neopterin
  50. 50. TREATMENT
  51. 51. CURB 65
  52. 52. Outpatients Treatment(empirical) Previously healthy and no antibiotics in past 3 months •A macrolide (clarithromycin or azithromycin or Doxycycline ) Comorbidities or antibiotics in past 3 months: •Respiratory fluoroquinolone [moxifloxacin ,levofloxacin ] or β- lactam ( high-dose amoxicillin or amoxicillin/clavulanate)
  53. 53. Inpatients, non-ICU •A respiratory fluoroquinolone [moxifloxacin ,levofloxacin ] •β -lactam [cefotaxime ,ceftriaxone ,ampicillin] plus a macrolide [oral clarithromycin or azithromycin)
  54. 54. Inpatients, ICU •β -lactam plus Azithromycin or a fluoroquinolone
  55. 55. Pseudomonas •An antipneumococcal, antipseudomonal β-lactam [piperacillin/tazobactam, cefepime , imipenem , meropenem plus flouroquinolons •Above β-lactams plus an aminoglycoside and azithromycin •Above β-lactams plus an aminoglycoside plus an antipneumococcal fluoroquinolone
  56. 56. Methicillin-resistant Staphylococcus aureus If MRSA , add linezolid or vancomycin
  57. 57. COMPLICATIONS •Lung abscess •Para-pneumonic effusions •Empyema •Sepsis •Metastatic infections (meningitis,endocarditis,arthritis) •ARDS , Respiratory failure •Circulatory failure •Renal failure •Multi-organ failure
  58. 58. Pneumonia complications SLAP HER (please don’t) •S - Septicaemia •L - Lung abcess •A - ARDS •P - Para-pneumonic effusions •H - Hypotension •E - Empyema •R - Respiratory failure /renal failure
  59. 59. Course Most healthy people recover from pneumonia in one to three weeks, but pneumonia can be life-threatening. The mortality rate associated with community-acquired pneumonia (CAP) is very low in most ambulatory patients and higher in patients requiring hospitalization, being as high as 37 percent in patients admitted to the intensive care unit (ICU).
  60. 60. Prevention •Smoking cessation •Better Nutrition •Respiratory hygiene measures •Pneumococcal polysaccharide vaccine •Inactivated influenza vaccine •Live attenuated influenza vaccine
  61. 61. Conclusion •The presence of an infiltrate on plain chest radiograph is considered the "gold standard" for diagnosing pneumonia when clinical and microbiologic features are supportive •Most initial treatment regimens for hospitalized patients with community-acquired pneumonia (CAP) are empiric •The mortality rate associated with community-acquired pneumonia (CAP) is very low in most ambulatory patients and higher in patients requiring hospitalization
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