**Continuous Murmur**
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**Core Concept**
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A continuous murmur is a type of cardiac murmur that is heard throughout systole and diastole, without any interruption. It is usually associated with aortic or pulmonary artery lesions that cause blood to flow from a high-pressure area to a low-pressure area continuously.

**Why the Correct Answer is Right**
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Continuous murmurs are typically heard in conditions such as patent ductus arteriosus (PDA), aortic regurgitation, and pulmonary artery runoff lesions. In these conditions, blood flows from a high-pressure area to a low-pressure area continuously, producing a murmur that is audible throughout systole and diastole. For example, in PDA, blood flows from the high-pressure aorta to the low-pressure pulmonary artery, producing a continuous murmur.

**Why Each Wrong Option is Incorrect**
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**Option A:** This option is incorrect because [insert reason]. Continuous murmurs are typically associated with aortic or pulmonary artery lesions, not mitral valve lesions.

**Option B:** This option is incorrect because [insert reason]. While tricuspid regurgitation can produce a systolic murmur, it does not typically produce a continuous murmur.

**Option C:** This option is incorrect because [insert reason]. Pulmonary stenosis typically produces a systolic ejection murmur, not a continuous murmur.

**Clinical Pearl / High-Yield Fact**
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Remember that continuous murmurs are often associated with aortic or pulmonary artery lesions, and are usually heard in conditions such as PDA, aortic regurgitation, and pulmonary artery runoff lesions.

**Correct Answer:** A. Mitral regurgitation.