Nitroglycerin is contraindicated in patients:
Select one:
A. with a systolic blood pressure less than 120 mm Hg.
B. who have taken up to two doses.
C. who have experienced a head injury.
D. with a history of an ischemic stroke.
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Deoxygenated blood from the body returns to the:
Select one:
A. right atrium.
B. right ventricle.
C. left ventricle.
D. left atrium.
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Angina pectoris occurs when:
Select one:
A. myocardial oxygen demand exceeds supply.
B. a coronary artery is totally occluded by plaque.
C. one or more coronary arteries suddenly spasm.
D. myocardial oxygen supply exceeds the demand.
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A patient with atherosclerotic heart disease experiences chest pain during exertion because:
Select one:
A. the coronary arteries suddenly spasm and cause a marked reduction in myocardial blood flow.
B. tissues of the myocardium undergo necrosis secondary to a prolonged absence of oxygen.
C. the ragged edge of a tear in the coronary artery lumen causes local blood clotting and arterial narrowing.
D. the lumen of the coronary artery is narrowed and cannot accommodate increased blood flow.
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