As it is a sound, a murmur is generally not felt by the patient, either in the chest or elsewhere in the body. A heart murmur should not cause weakness or blurred vision. Sometimes infections or blood clots on valves can cause these symptoms by causing a stoke or mini-stroke. I am very concerned by your question. If you are experiencing any of the symptoms you are writing about, I would urge you to seek medical attention immediately.
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