Posted: December 1st, 2022
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Brian is a 7-year-old boy who presents to the primary care office with his mother. His mom has noticed that Brian has been coughing frequently and seems to have shortness of breath at times. She reports that Brian had a “cold” with a low grade fever and runny nose about 2 weeks ago and the symptoms seem to appear after the cold.
On physical examination, Brian appears in moderate respiratory distress, with suprasternal and intercostal retractions. His vital signs include a temperature of 100 A°F, a respiratory rate of 32 breaths per minute, heart rate of 120 beats per minute, and pulse oximetry of 95% on room air. Lung exam is notable for diffuse symmetrical expiratory wheezes. His nasal mucosa is erythematous with boggy turbinates and clear mucus. The remainder of the exam is unremarkable asthma vs pneumonia pathophysiology discussion essays.
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Pneumonia | Asthma | ||
Acute | Chronic | ||
Inflammation and Infection
In the terminal airways and alveoli. |
Inflammation
Of the bronchials |
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CAP- Community Acquired Pneumonia (see below)
HAP – Hospital Acquired Pneumonia – This is a nosocomial infection that occurs mostly commonly in those who are immunocompromised or who experience prolonged hospitalization for treatment of malignancy, trauma, surgery, or underlying chronic illness. |
Bronchial hyperreactivity and reversible airflow obstruction usually in response to an allergen.
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Prevalence: | CAP or Community Acquired Pneumonia is the major cause of morbidity and mortality in children, in developing countries.
Most caused by RSV – Virus. Risk factors for developing CAP are ages younger than 2 years old. |
Common chronic disease in childhood.
Affects 8.3% of US children between birth and 17 years of age. Prevalence is shown to be increasing. |
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Population affected the most: | Children in developing countries.
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Black and Puerto Rican children and those of low socioeconomic status.
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Originates from: | Overcrowded living conditions, winter season, recent antibiotic treatment, daycare attendance, and passive smoke exposure.
Nutritional status, age, and underlying disease process influence morbidity and mortality rates related to CAP asthma vs pneumonia pathophysiology discussion essays. |
Childhood asthma emerges from a complicated interaction between genetic and environmental factors.
There are many genotypes associated with multiple phenotypes of asthma, including early onset mild allergic asthma, severe asthma and later onset asthma associated with obesity, atopic (allergic) or nonatropic asthma, as well as corticosteroid dependent asthma. |
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Characterized by: | Viral | Bacterial | Allergen |
Causal Agents | RSV – Respiratory syncytial virus, influenza, adenovirus, others | Streptococcus pneumoniae, Staphylococcus Aureus Atypical bacterial: –
Group A beta hemolytic streptococci Mycoplasma pneumoniae
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Environmental Allergens-
Air pollution, dust mites, molds, cockroach antigen, cat exposure, and tobacco smoke. Respiratory Tract Infections GERD – Gastroesophageal reflux Preterm births Childhood obesity |
Pathophysiology | 2-3 times more likely to occur in children than in adults, and an incidence usually follows a seasonal pattern.
RSV is the common culprit. There are others. Parainfluenza, influenza, human rhinovirus, human metapneumovirus, and adenoviruses.
There is initial destruction of the ciliated epithelium of the distal airway with sloughing of cellular material and initiation of an inflammatory response.
Bacterial coinfections are common.
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Bacterial pneumonia usually begins with aspiration of one’s own nasopharyngeal bacteria.
A preceding viral infection sometimes sets the stage for bacterial infection by causing epithelial damage, reduced mucociliary clearance in the trachea and major bronchi, as well as reduced immune response. Once in the alveolar region, bacteria encounter local host defenses such as antibodies, complement, and cytokines, which prepare the bacteria to be eaten by alveolar macrophages.
Alveolar macrophages recognize the bacterial with their surface receptors and phagocytose them. If this fails then the macrophages release numerous inflammatory cytokines and neutrophils will be recruited into the lung.
Then a intense cytokine-mediated inflammation will ensue Vascular engorgement, edema, and a fibrinopurulent exudate occur. The alveoli filling precludes gas exchange and if extensive can lead to respiratory failure. |
Allergic asthma is initiated by type 1 hypersensitivity reaction primarily medicated by T-helper 2 (Th2) lymphocytes whose cytokines activate mast cells eosinophilia, leukocytosis, and enhanced B-cell IgE production.
Inflammation, bronchospasm, and mucus production in the airways both lead to ventilation and perfusion mismatch with hypoxemia and to expiratory airway obstruction with air trapping and increased work of breathing in young children. Airway obstruction can be more severe because young children have a smaller diameter in their airways. |
Mode of Transmission | Direct contact
Droplet transmission, or aerosol exposure.
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Occurs person to person with often a 2–3-week incubation period asthma vs pneumonia pathophysiology discussion essays. | Inhalation, ingestion or contact with the allergen in question. |
Presenting Symptoms | Cough no fever.
WBC normal Immunofluorescence tests may confirm diagnosis.
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The viral illness is followed by fever with chills and rigors.
Shortness of breath Productive cough Occasional blood streaked sputem. Auscultation reveals crackles or decreased breath sounds. Malaise, vomiting, abdominal pain, and chest pain, Absolute neutrophil counts and the percentage of bands (immature neutrophils) are usually elevated. Chest Xray will reveal dense pulmonary infiltrates. |
Coughing, expiratory wheezing, and shortness of breath. Breath sounds may become faint when air movement is poor.
Speaking is difficult. Elevated respiratory rate and heart rate. Nasal flaring. Use of accessory muscles with retractions in the substernal, subcostal, intercostal, suprasternal, or sternocleidomastoid areas. |
“Asthma is one of the most common chronic syndromes worldwide and it encompasses a variety of signs and symptoms that usually do not include a high fever (Johnson et.al, 2019). Grandbastien, M., Piotin, A., Godet, J., Abessolo-Amougou, I., Ederlé, C., Enache, I., Fraisse, P., Tu Hoang, T. C., Kassegne, L., Labani, A., Leyendecker, P., Manien, L., Marcot, C., Pamart, G., Renaud-Picard, B., Riou, M., Doyen, V., Kessler, R., Fafi-Kremer, S., Metz-Favre, C., … de Blay, F. (2020). SARS-CoV-2 Pneumonia in Hospitalized Asthmatic Patients Did Not Induce Severe Exacerbation asthma vs pneumonia pathophysiology discussion essays. The journal of allergy and clinical immunology. In practice, 8(8), 2600–2607. https://doi.org/10.1016/j.jaip.2020.06.032Pelton, S. I., Shea, K. M., Bornheimer, R., Sato, R., & Weycker, D. (2019). Pneumonia in young adults with asthma: impact on subsequent asthma exacerbations. Journal of asthma and allergy, 12, 95–99. https://doi.org/10.2147/JAA.S200492more0 UnreadUnread
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