ASTHMA AND CHRONIC OBSTRUCTIVE PULMONARY DISEASE
ESSENTIALS OF DIAGNOSIS
Cough, wheezing, chest tightness, often worse at night.
Prolonged expiratory phase with bilateral wheezing, tachypnea, tachycardia, hypoxia.
Reversible with bronchodilators.
Chronic Obstructive Pulmonary Disease
Smoker with chronic productive cough complains of dyspnea.
Increased sputum production, bilateral wheezing, rales, and rhonchi.
Obstructive lung disease is classified into one of two categories: asthma and chronic obstructive pulmonary disease (COPD). Patients with asthma have disease that is episodic and reversible to a significant degree. Between acute attacks these patients may have relatively normal lung function. However, patients who have persistent inflammation may develop, over time, permanent changes that contribute to a decline in functional capacity. Patients with COPD have significant fixed airway obstruction that remains at baseline even when the patient’s illness is under optimal control. In addition to the concept of reversibility, there are other characteristics that distinguish these two groups. Asthmatic patients tend to be younger and more likely to have allergic triggers and conditions. A family history is common. Patients with COPD usually have a long history of cigarette smoking and more significant permanent lung injury and chest remodeling. Associated right heart failure does not occur in asthma but is common in advanced cases of COPD.
Many conditions commonly associated with asthma and COPD exacerbations are listed in Table 33–1. Some of these conditions are treatable, and the clinician should ask about them specifically while taking the patient’s history.
Table 33–1.Common precipitating factors in acute asthma and exacerbations of chronic obstructive pulmonary disease. ||Download (.pdf) Table 33–1. Common precipitating factors in acute asthma and exacerbations of chronic obstructive pulmonary disease.
|Infection (especially upper respiratory tract viral infections) |
|Drugs (aspirin, nonsteroidal anti-inflammatory agents, food coloring, β-blockers) |
|Emotional stress |
|Inhaled irritants (eg, air pollution, cigarette smoke) |
|Occupational exposure to dusts, gases, etc |
|Aeroallergens (pollens, grasses, molds, animal dander) |
|Gastroesophageal reflux disease |
|Weather changes (especially cold) |
|Menses (catamenial asthma) |
There are two varieties of COPD: chronic bronchitis and emphysema. Chronic bronchitis is characterized by chronic cough and sputum production and is almost invariably associated with prolonged and heavy cigarette smoking. Such patients usually have increased lung volumes and a barrel-shaped chest with increased lung markings on chest X-ray (CXR). In advanced cases, they may have cyanosis and peripheral edema due to right heart failure. Patients with emphysema on the other hand are typically thin without cyanosis and breathe through pursed lips. Accessory muscle use is more prominent. The CXR usually shows a paucity of lung markings reflecting tissue destruction. Some patients with emphysema have genetic factors (α1-antitrypsin deficiency) as the basis of their illness, but most have a long history of cigarette smoking.