1. Community acquired pneumonia is one of the types of pneumonia which is acquired from the community .
#. Pathogenesis
Community-Acquired Pneumonia
• Microorganisms gain access to the lower
respiratory tract via:
- Inhaled as aerosolized particles
- Enter via bloodstream from an extra-pulmonary site of infection
- Aspiration of oropharyngeal contents
- Commensal bacteria in respiratory tract
become pathogenic
• When pulmonary defenses are functioning optimally, aspirated organisms are cleared via the mucociliary
transport system, coughing, and alveolar macrophages
• Factors that promote aspiration include altered MS (stroke, seizure), neuromuscular dz, ETOH and medications
• Lung infections w/viruses can suppress antibacterial activity of the lungs by impairing alveolar macrophage
fxn and mucociliary clearance
• Mucociliary clearance is reduced by diseases, ETOH, and drugs (narcotics)
• Defects in cellular and humoral immune function
#. Etiology
• The causative organism is only identified in 30- 50% of cases of CAP
• S. pneumoniaeis most common cause
• Underlying lung disease (i.e. COPD)
-H. influenzae, Moraxella catarrhalis
• s/p respiratory viral infxn (i.e. influenza)
-S. aureus
• Chronic oral steroids/severe underlying
bronchopulm dz, ETOH, frequent abx use
- Enterobacteriaceae, P. aeruginosa
#. Signs/Symptoms
• Abrupt onset of:
- Fever
- Chills
- Dyspnea
- Cough
• Productive vs nonproductive
- Chest pain
- Mental status changes
- Fatigue
- Headache
#. Physical Examination :-
• Tachypnea, tachycardia
• Lung examination
- Dullness to percussion
- Diminished breath sounds
- Inspiratory crackles
- Rales, rhonchi
- Tactile fremitus, egophony
- Chest wall retractions
#. Diagnostic and laboratory investigations :-
Chest Radiograph
• Lobar consolidation
• Dense lobar or
segmental infiltrate
• Patchy consolidation
• Diffuse, alveolar pattern
#. Laboratory Examination
• WBC with differential
- May be elevated
- Look for left shift
• Sputum gram stain and culture
• Blood cultures
- May help identify the presence of bacteremia and of a
resistant pathogen (low yield ~ 11%)
• Oxygen saturation
- Hypoxia on arterial blood gas (ABG) or pulse oximetry.
write a nursing care plan with the case study following the rubric Case Study, Chapter 23,...
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