FREE Physician Assistant Scientific Knowledge Questions and Answers

Question 1

Which of the following lung diseases is marked by dyspnea, pursed lips during breathing, a thin, wasted appearance, a hardly audible cough, and diminished breathing sounds?

Accepted Answer

Emphysema

Answer

Emphysema is a form of chronic obstructive pulmonary disease (COPD) characterized by the destruction of alveolar walls and loss of lung elasticity. Patients with emphysema often present as 'pink puffers' – appearing thin and wasted, experiencing dyspnea, using pursed-lip breathing, and having a quiet chest with diminished breath sounds due to poor air movement and hyperinflation.

Question 2

For chronic obstructive pulmonary disease, all of the following are suggested treatment options EXCEPT:

Accepted Answer

Beta blockers

Answer

Beta blockers are generally contraindicated or used with extreme caution in patients with chronic obstructive pulmonary disease (COPD). Non-selective beta blockers can block beta-2 receptors in the airways, leading to bronchoconstriction and worsening airflow obstruction. Standard treatments for COPD include bronchodilators like beta agonists and anticholinergics, as well as corticosteroids.

Question 3

Which of the following cardiomyopathies on a chest radiograph exhibits an inflated balloon-like heart and pulmonary congestion?

Accepted Answer

Dilated cardiomyopathy

Answer

Dilated cardiomyopathy (DCM) is characterized by significant enlargement of the heart chambers, particularly the ventricles. On a chest radiograph, this appears as marked cardiomegaly, often described as an 'inflated balloon-like heart.' The impaired pumping function also frequently leads to pulmonary congestion and edema, which would be visible on the X-ray.

Question 4

Which of the following DON'T add to the causes of atrial fibrillation?

Accepted Answer

Hypothyroidism

Answer

Hypothyroidism is generally associated with bradycardia and a *decreased* risk of atrial fibrillation (AFib), or at least is not a direct cause. In contrast, hyperthyroidism (thyrotoxicosis) is a well-established cause of AFib due to increased adrenergic tone and myocardial excitability. Pulmonary disease, ischemia, and rheumatic heart disease are all recognized risk factors for developing AFib.

Question 5

Which of the following cardiovascular disorders frequently exhibits an irregularly irregular pulse as a typical clinical sign?

Accepted Answer

Atrial fibrillation

Answer

Atrial fibrillation is characterized by chaotic electrical activity in the atria, leading to uncoordinated atrial contractions. This results in an irregular transmission of impulses to the ventricles, causing the heart to beat in a completely unpredictable and irregular rhythm. This distinct pattern is clinically recognized as an irregularly irregular pulse, making it a hallmark sign of atrial fibrillation.

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FREE Physician Assistant Scientific Knowledge Questions and Answers