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Pathology - Chronic obstructive pulmonary disease (COPD)
Definition: A chronic pulmonary ailment marked by dyspnea resulting from poorly reversible and increasing airflow restriction.
Epidemiology • Extremely prevalent. Primarily a condition affecting middle-aged to older adult smokers.
Aetiology • The majority of instances are attributable to smoking. • Instances in younger individuals may result from A-1-antitrypsin deficiency. Pathogenesis Inflammation and scarring of tiny bronchioles are considered the primary cause of airflow obstruction. • An imbalance between proteases and antiproteases leads to the degradation of lung parenchyma, resulting in the dilatation of terminal airspaces (emphysema) and air trapping. • Hyperplasia of mucous glands and the irritative effects of smoking contribute to a productive cough (chronic bronchitis).
Presentation • Abrupt emergence of dyspnea during exertion, occurring against a history of chronic cough and sputum expectoration. • Spirometric analysis generally reveals a diminished FEV1 and a reduced FEV1/FVC ratio (Fig. 5.1). Macroscopy • The lungs exhibit hyperinflation, characterized by thick mucus in the airways and dilated terminal airspaces. • Bullae may be observed.
Histopathology • Persistent inflammation and fibrosis of tiny bronchioles (chronic obstructive bronchiolitis). • Highly pigmented macrophages in respiratory bronchioles (respiratory bronchiolitis). • Enlarged terminal airspaces (emphysema). Larger airways may exhibit mucus gland hyperplasia
.
Prognosis • Progressive deterioration of lung function accompanied by bouts of acute exacerbation resulting from infection, pneumothorax, or pulmonary embolism. • Subsequently, pulmonary hypertension and right ventricular failure manifest. Left ventricular failure frequently coexists with ischemic heart disease. • Mortality frequently associated with a conjunction of respiratory and heart failure
Definition: A chronic pulmonary ailment marked by dyspnea resulting from poorly reversible and increasing airflow restriction.
Epidemiology • Extremely prevalent. Primarily a condition affecting middle-aged to older adult smokers.
Aetiology • The majority of instances are attributable to smoking. • Instances in younger individuals may result from A-1-antitrypsin deficiency. Pathogenesis Inflammation and scarring of tiny bronchioles are considered the primary cause of airflow obstruction. • An imbalance between proteases and antiproteases leads to the degradation of lung parenchyma, resulting in the dilatation of terminal airspaces (emphysema) and air trapping. • Hyperplasia of mucous glands and the irritative effects of smoking contribute to a productive cough (chronic bronchitis).
Presentation • Abrupt emergence of dyspnea during exertion, occurring against a history of chronic cough and sputum expectoration. • Spirometric analysis generally reveals a diminished FEV1 and a reduced FEV1/FVC ratio (Fig. 5.1). Macroscopy • The lungs exhibit hyperinflation, characterized by thick mucus in the airways and dilated terminal airspaces. • Bullae may be observed.
Histopathology • Persistent inflammation and fibrosis of tiny bronchioles (chronic obstructive bronchiolitis). • Highly pigmented macrophages in respiratory bronchioles (respiratory bronchiolitis). • Enlarged terminal airspaces (emphysema). Larger airways may exhibit mucus gland hyperplasia
.
Prognosis • Progressive deterioration of lung function accompanied by bouts of acute exacerbation resulting from infection, pneumothorax, or pulmonary embolism. • Subsequently, pulmonary hypertension and right ventricular failure manifest. Left ventricular failure frequently coexists with ischemic heart disease. • Mortality frequently associated with a conjunction of respiratory and heart failure
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