If pericardial fluid accumulates excessively, what complication can arise?
Heart failure
Cardiac tamponade
Pulmonary embolism
Myocardial infarction
The Correct Answer is B
A. Heart failure:
Heart failure involves impaired cardiac output due to structural or functional heart abnormalities. Although pericardial effusion can eventually reduce cardiac output, the direct complication of excessive fluid is not standard heart failure but cardiac tamponade, a more acute and dangerous condition.
B. Cardiac tamponade:
Excess fluid in the pericardial sac creates pressure that restricts ventricular filling, reducing stroke volume and cardiac output. This can rapidly lead to hypotension, muffled heart sounds, and jugular venous distention-a classic triad known as Beck’s triad. Cardiac tamponade is a life-threatening emergency requiring prompt intervention.
C. Pulmonary embolism:
Pulmonary embolism occurs when a clot lodges in the pulmonary arteries. It is unrelated to pericardial fluid accumulation and arises from thromboembolic events, not fluid pressure on the heart.
D. Myocardial infarction:
Myocardial infarction occurs due to coronary artery blockage, leading to ischemia. While tamponade can reduce cardiac output, it does not directly cause a myocardial infarction.
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Related Questions
Correct Answer is A
Explanation
A. Arteries have thicker walls than veins:
Arteries have thicker walls composed of more smooth muscle and elastic tissue to withstand the high pressure of blood ejected from the heart. Veins have thinner walls and larger lumens because they operate under lower pressure and rely on valves and skeletal muscle pumps to return blood to the heart.
B. Veins have no valves, while arteries have valves:
This is incorrect because veins have valves to prevent backflow of blood, especially in the extremities. Arteries do not need valves because blood is propelled by high pressure from ventricular contraction.
C. Arteries have larger lumens compared to veins:
Veins generally have larger lumens than arteries, allowing them to act as capacitance vessels that store blood. Arteries have smaller lumens relative to their wall thickness.
D. Arteries carry blood to the heart, while veins carry blood away from the heart:
This reverses the roles. Arteries carry blood away from the heart, while veins carry blood back to the heart. Proper understanding of directionality is crucial in circulatory physiology.
Correct Answer is A
Explanation
A. Supplies the lateral wall of the left ventricle:
The circumflex artery branches from the left coronary artery and supplies the lateral and posterior walls of the left ventricle as well as part of the left atrium. This supply is crucial for maintaining effective left ventricular contraction and overall cardiac output.
B. Supplies the right ventricle:
The right ventricle is primarily supplied by the right coronary artery, not the circumflex artery. Misidentifying this can affect understanding of infarct locations.
C. Supplies the interventricular septum:
The interventricular septum is mainly supplied by the LAD artery, which is critical for coordinating left ventricular contraction.
D. Supplies the right atrium:
The right atrium is primarily supplied by the RCA, not the circumflex artery. Understanding arterial supply is important for predicting conduction system involvement in MI.
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