Which of the following statements about risk factors of Chronic Obstructive Pulmonary Disorder (COPD) is true?

Smoking is the most important risk factor of Chronic Obstructive Pulmonary Disorder (COPD).

Men are more susceptible to developing Chronic Obstructive Pulmonary Disorder (COPD) and emphysema than women.

Smoking marijuana do not increase the risk of COPD.

Environmental exposures to dust, vapors, and fumes do not increase a person's risk for COPD.

Answer and Explanation

The Correct Answer is A

Rationale:

A. Smoking is the most important risk factor of Chronic Obstructive Pulmonary Disorder (COPD) is correct. Cigarette smoking is the primary cause of COPD, accounting for the majority of cases. The toxic chemicals in tobacco smoke damage airway epithelium, impair mucociliary clearance, and trigger chronic inflammation, leading to chronic bronchitis, emphysema, and progressive airflow limitation. The risk increases with both the duration and intensity of smoking.

B. Men are more susceptible to developing COPD and emphysema than women is incorrect. Although historically men had higher prevalence rates due to smoking patterns, women are equally or even more susceptible to the harmful effects of cigarette smoke on lung tissue. Recent studies indicate that women may develop COPD at younger ages and with lower cumulative smoking exposure.

C. Smoking marijuana does not increase the risk of COPD is incorrect. Smoking marijuana can also cause airway inflammation, chronic bronchitis, and impaired lung function, similar to tobacco, although the cumulative risk may differ. Regular inhalation of any smoke contributes to COPD development.

D. Environmental exposures to dust, vapors, and fumes do not increase a person's risk for COPD is incorrect. Occupational and environmental exposures are well-established risk factors. Long-term inhalation of dust, chemical fumes, and air pollutants can contribute to chronic airway inflammation and airflow limitation, either independently or synergistically with smoking.

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Correct Answer is A

Explanation

Rationale:

A. Frequent respiratory infections and salty skin is correct. Cystic fibrosis (CF) is a genetic disorder caused by mutations in the CFTR gene, which affects chloride and sodium transport across epithelial cells. This leads to thick, sticky mucus in the respiratory, gastrointestinal, and reproductive systems. In the lungs, the mucus traps bacteria, resulting in recurrent respiratory infections, chronic cough, and progressive lung damage. The defective chloride transport also causes excessive sodium in sweat, making the skin taste salty. These manifestations are hallmark signs of CF.

B. Bloody sputum and barrel chest is incorrect. While barrel chest can develop in chronic obstructive pulmonary diseases like emphysema, and bloody sputum may be present in advanced lung disease, these are not primary or early indicators of cystic fibrosis.

C. Painless open sores and petechiae are incorrect. These findings suggest hematologic or dermatologic disorders such as thrombocytopenia or vasculitis and are unrelated to cystic fibrosis.

D. Watery diarrhea and weight gain is incorrect. Cystic fibrosis commonly causes malabsorption and steatorrhea, leading to fatty, bulky stools and poor weight gain, rather than watery diarrhea and increased weight. Pancreatic enzyme insufficiency contributes to nutrient malabsorption.

A. Flattened diaphragm on chest x-ray B. Increased breath sounds C. Clear lung fields and dry cough D. Bradycardia and constricted pupils

Correct Answer is A

Explanation

Rationale:

A. In emphysema, destruction of alveolar walls and loss of elastic recoil lead to air trapping and hyperinflation of the lungs. Over time, this causes the diaphragm to flatten as the lungs expand, which is a classic radiographic sign of advanced emphysema. This finding correlates with reduced ventilatory efficiency, increased work of breathing, and progressive respiratory compromise.

B. In emphysema, breath sounds are often decreased due to the destruction of alveoli and hyperinflation of the lungs. Loud or increased breath sounds are more typical in conditions such as bronchospasm or pulmonary edema with turbulent airflow.

C. While early emphysema may present with minimal auscultatory findings and a mild cough, advanced disease is associated with hyperinflated lungs, decreased breath sounds, and sometimes wheezing. Clear lung fields alone do not indicate severe or advanced disease.

D. Bradycardia and constricted pupils are incorrect. These findings are unrelated to emphysema. Bradycardia and miosis may suggest medication effects (e.g., opioids) or neurologic conditions, not pulmonary pathology.

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Which of the following statements about risk factors of Chronic Obstructive Pulmonary Disorder (COPD) is true?

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