What condition can cause coronary artery disease (CAD)?
Heart failure.
Pulmonary embolus.
Anemia.
Hypertension.
The Correct Answer is D
Choice A rationale
Heart failure is generally a consequence or a result of coronary artery disease rather than its cause. When coronary arteries are narrowed or blocked, the heart muscle does not receive enough oxygen, leading to damage and weakened pumping ability over time. While heart failure involves complex physiological changes, the primary drivers of the arterial damage seen in CAD are metabolic and hemodynamic factors like lipid levels and high blood pressure, not the failure of the pump.
Choice B rationale
A pulmonary embolus is a blockage in one of the pulmonary arteries in the lungs, usually caused by blood clots that travel from the legs. This is a critical condition affecting the pulmonary circulation and right side of the heart. While it causes acute strain on the heart, it does not cause the chronic atherosclerotic changes and plaque buildup within the coronary arteries that define coronary artery disease. These are two distinct vascular pathologies with different origins.
Choice C rationale
Anemia is a condition where the blood lacks enough healthy red blood cells or hemoglobin to carry adequate oxygen to the body's tissues. While anemia can exacerbate the symptoms of coronary artery disease by further reducing oxygen delivery to a struggling heart, it does not cause the structural narrowing or plaque formation in the arteries. CAD is an inflammatory and lipid-driven process, whereas anemia is a hematological issue concerning the oxygen-carrying capacity of the blood.
Choice D rationale
Hypertension is a major, direct cause and risk factor for coronary artery disease. High blood pressure creates chronic mechanical stress and shear force against the arterial walls, leading to endothelial injury. This damage allows cholesterol and other lipids to enter the vessel wall, initiating the formation of atherosclerotic plaques. Over time, these plaques narrow the arteries, restricting blood flow to the myocardium. Managing blood pressure is a primary strategy in preventing the development and progression of CAD.
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Related Questions
Correct Answer is D
Explanation
Choice D rationale
Dysrhythmias are the most common and immediate complication after a myocardial infarction. When heart muscle cells are damaged or die due to lack of oxygen, the electrical conduction system of the heart is disrupted. The ischemic tissue can become irritable, leading to abnormal electrical impulses. These can range from relatively harmless premature contractions to life-threatening rhythms like ventricular tachycardia or ventricular fibrillation, which are the leading causes of death in the early post-infarction period.
Choice A rationale
Endocarditis is an infection of the inner lining of the heart chambers and valves, usually caused by bacteria entering the bloodstream. While a myocardial infarction causes structural damage, it does not inherently introduce pathogens into the heart to cause an infection. Endocarditis is more commonly associated with intravenous drug use, dental procedures, or prosthetic heart valves. Myocardial infarction affects the muscular layer (myocardium) rather than the endocardial lining through an infectious process.
Choice B rationale
Hyperthyroidism is an endocrine disorder characterized by the overproduction of thyroid hormone by the thyroid gland. It is not a complication of a myocardial infarction. While hyperthyroidism can cause cardiac issues like tachycardia or atrial fibrillation which might strain the heart, the reverse is not true. A heart attack is a localized vascular and muscular event in the heart and has no pathophysiological mechanism that would cause the thyroid gland to increase its hormone production.
Choice C rationale
Rheumatic fever is an inflammatory disease that can develop as a complication of an untreated or inadequately treated strep throat infection caused by group A Streptococcus bacteria. It can lead to permanent damage to the heart valves, known as rheumatic heart disease. This process is entirely distinct from a myocardial infarction, which is caused by coronary artery occlusion and ischemia. There is no link between the necrosis of heart muscle and the autoimmune response triggered by a streptococcal infection.
Correct Answer is D
Explanation
Choice A rationale
This description refers to cardiac reserve, which is the difference between the rate at which the heart pumps blood and its maximum capacity for pumping at any given time. While cardiac reserve is an important physiological concept for assessing how well a person can tolerate physical stress or exercise, it does not define the baseline volume of blood pumped per minute. Cardiac output is a static measurement of flow, whereas reserve is a measure of potential increase.
Choice B rationale
This is the definition of the heart rate, measured in beats per minute. Heart rate is only one component used to calculate cardiac output. While the frequency of ventricular contractions is vital for determining the total volume of blood moved over time, it does not account for the volume of blood ejected during each individual beat. Normal resting heart rate for an adult typically ranges from 60 to 100 beats per minute, which is distinct from the total output.
Choice C rationale
This describes stroke volume, which is the amount of blood ejected from a ventricle with each individual contraction. Stroke volume is influenced by preload, afterload, and myocardial contractility. In a healthy adult, the average stroke volume is approximately 70 milliliters. While stroke volume is a critical variable in the equation, cardiac output specifically requires the multiplication of this volume by the heart rate to determine the total flow over a full sixty-second interval of time.
Choice D rationale
Cardiac output is the total volume of blood pumped by each ventricle per minute. It is calculated by the product of heart rate and stroke volume. For a healthy adult at rest, the normal range for cardiac output is approximately 4 to 8 liters per minute. This parameter is a primary indicator of how well the heart is meeting the metabolic demands of the body's tissues. Changes in cardiac output can signify various pathologies, including heart failure or shock.
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