Correct Answer: A

Rationale: The correct answer is A, Peripheral artery disease (PAD). PAD is a condition where the blood vessels that supply blood to the legs and feet become narrowed or blocked, leading to decreased blood flow, pain, and difficulty walking, especially during physical activity. Raynaud's disease (choice B) is characterized by vasospasms in the fingers and toes, causing them to turn white or blue. Varicose veins (choice C) are enlarged, twisted veins usually found in the legs. Pulmonary embolism (choice D) is a blockage in one of the pulmonary arteries in the lungs, often caused by a blood clot.

Correct Answer: A

Rationale: The interventricular septum is the correct answer as it is the wall that separates the left and right sides of the heart, ensuring the oxygenated and deoxygenated blood do not mix. The endocardium is the inner lining of the heart chambers, the epicardium is the outermost layer of the heart wall, and the pericardium is the sac that surrounds the heart, providing protection and anchoring the heart in place. Therefore, choices B, C, and D are incorrect in the context of separating the left and right sides of the heart.

Correct Answer: A

Rationale: The correct answer is A: Preload. Preload is the degree of myocardial fiber stretch before contraction, influenced by the volume of blood returning to the heart. This parameter is related to the amount of blood in the ventricles at the end of diastole. Choice B, Afterload, refers to the pressure or resistance that the ventricles must overcome to eject blood. Choice C, Contractility, is the intrinsic ability of the heart muscle to contract. Choice D, Ejection fraction, is the percentage of blood pumped out of the ventricles with each contraction.

Correct Answer: A

Rationale: Mitral stenosis is the correct answer. It is a condition characterized by the narrowing of the heart's mitral valve, which hinders the flow of blood from the left atrium to the left ventricle. This obstruction can lead to symptoms such as shortness of breath and fatigue. Aortic stenosis (choice B) is the narrowing of the aortic valve, not the mitral valve. Tricuspid regurgitation (choice C) is the backflow of blood through the tricuspid valve, not narrowing. Pulmonary hypertension (choice D) is increased blood pressure in the pulmonary arteries, not narrowing of the mitral valve.

Correct Answer: A

Rationale: The correct answer is to hold the digoxin and notify the healthcare provider. A potassium level of 2.7 mEq/L is considered low and can increase the risk of digoxin toxicity. Holding the medication and informing the healthcare provider is crucial to prevent adverse effects. Administering the digoxin as ordered (Choice B) would put the client at a higher risk for toxicity. Increasing the dose of digoxin (Choice C) is not appropriate when the client's potassium level is low. Administering potassium supplements (Choice D) may be necessary but is not the priority action in this situation.