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Continuous murmurs
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Continuous murmurs : ウィキペディア英語版
Continuous murmurs

Heart murmurs are most frequently organized by timing, into systolic heart murmurs and diastolic heart murmurs. However, continuous murmurs can not be directly placed into either category.
These murmurs are due to blood flow from a high pressure chamber or vessel to a lower pressure system.
* Patent ductus arteriosus. PDA is an abnormal connection between the aorta and the pulmonary artery, which normally should be closed in infancy. Since aortic pressure is higher than pulmonary pressure, a continuous murmur occurs. This murmur is often described as a machinery murmur, or Gibson's murmur. This is named for George Alexander Gibson, who characterized it in 1898.〔Gibson GA 1898 Diseases of the heart and aorta. Pentland, Edinburgh, pp 61, 303, 310–312〕
* Aortopulmonary window.
* shunts. Usually a left to right shunt through a small atrial septal defect in the presence of mitral valve obstruction.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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