You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is An early systolic murmur may be caused by all of the following, EXCEPT: and explain in detail?
In Aoic stenosis, murmur is ejection systolic ie: murmur stas after the isovolumic or isometric contraction phase. So the murmur stas only after the opening of the semilunar valve. In all the other conditions murmur stas in the isometric contraction phase itself, so its early systolic.