What is the condition where the heart's mitral valve becomes narrowed, restricting blood flow from the left atrium to the left ventricle?

Correct Answer: A

Rationale: The correct answer is A: Mitral stenosis. Mitral stenosis refers to the narrowing of the mitral valve, which obstructs blood flow from the left atrium to the left ventricle. This condition leads to increased pressure in the left atrium and lungs, causing symptoms like shortness of breath and fatigue. Explanation: 1. Mitral stenosis specifically involves the mitral valve, not the aortic valve (B) or the tricuspid valve (C). 2. Tricuspid regurgitation (C) involves leakage of blood backward through the tricuspid valve, not narrowing. 3. Pulmonary hypertension (D) is a condition characterized by high blood pressure in the arteries of the lungs due to various causes, not specifically related to mitral valve narrowing.

Correct Answer: A

Rationale: The correct answer is A: Angioplasty. Angioplasty involves using a balloon to open a narrowed or blocked blood vessel, followed by the placement of a stent to keep the vessel open. This procedure is commonly used to treat conditions like coronary artery disease. Valve replacement (B) involves replacing damaged heart valves, CABG (C) involves bypassing blocked coronary arteries using grafts, and endarterectomy (D) involves removing plaque from arteries, but none of these procedures specifically involve using a balloon and stent to open a narrowed or blocked blood vessel.

Correct Answer: A

Rationale: The correct answer is A: Deep vein thrombosis (DVT). DVT occurs when a blood clot forms in a deep vein, often in the legs. This can cause pain, swelling, and potentially serious complications if the clot dislodges and travels to the lungs, leading to a pulmonary embolism. Varicose veins (C) are enlarged, twisted veins close to the skin's surface, not deep veins. Aneurysm (D) is the ballooning of a blood vessel, not a clot formation. Pulmonary embolism (B) is a complication of DVT, not the initial condition.

Correct Answer: A

Rationale: The correct answer is A: Peripheral artery disease (PAD). PAD is characterized by narrowed or blocked blood vessels in the legs, leading to reduced blood flow, causing pain and difficulty walking (claudication). The narrowing is typically due to atherosclerosis. Raynaud's disease (B) involves spasms of small arteries, causing reduced blood flow to fingers and toes, not legs. Varicose veins (C) are enlarged, twisted veins, not arteries. Pulmonary embolism (D) is a blockage in the lungs' arteries, not the legs.

Correct Answer: B

Rationale: The correct answer is B: Positive inotropic, negative chronotropic effect. Digoxin is a positive inotrope, meaning it increases the force of myocardial contraction, which helps improve cardiac output in heart failure. It has a negative chronotropic effect, meaning it decreases the heart rate by slowing down the electrical conduction in the heart, which can be beneficial in certain heart conditions. Choice A (Negative inotropic, negative chronotropic effect) is incorrect because digoxin is a positive inotrope, not a negative inotrope. Choice C (Negative inotropic, positive chronotropic effect) is incorrect because digoxin does not have a positive chronotropic effect. Choice D (Positive inotropic, positive chronotropic effect) is incorrect because digoxin has a negative chronotropic effect, not a positive one. Therefore, the correct choice is B due to the combination of positive inotropic effect and negative chronotropic effect of digoxin on the heart